youssefbelghmi/MNLP_M3_mcqa_dataset_support

dataset stringclasses 6 values	id stringlengths 12 16	question stringlengths 1 935	choices sequencelengths 4 4	answer stringclasses 4 values	support stringlengths 0 7.76k ⌀
sciq	sciq_01_01661	What do some plants produce that protects dormant seeds and aids in their dispersal?	[ "leaves", "roots", "fruit", "stems" ]	C
sciq	sciq_01_10417	What do we call animals that have a backbone and belong to the phylum chordata?	[ "organelles", "mammals", "vertebrates", "invertebrates" ]	C	Vertebrates are animals that have a backbone. All of them are placed in the Phylum Chordata. Modern vertebrates include fish, amphibians, reptiles, birds, and mammals. Only about 5 percent of animal species are vertebrates.
ARC-Challenge	arc_04_02652	A student is measuring the boiling point of a salt and water mixture. He takes one temperature measurement of 105°C. Which is the best way to ensure the results are valid?	[ "repeat the investigation", "change the volume of water", "add more salt to the mixture", "do the investigation without salt" ]	A	null
sciq	sciq_01_04630	What type of vents are giant tube worms found at?	[ "hydrothermal", "Heated", "temperature", "oxygen" ]	A	Giant tube worms are found at hydrothermal vents. They get food from the chemosynthetic bacteria that live within them. The bacteria provide food; the worms provide shelter.
math_qa	mathqa_03_01913	[ ( 3.242 x 14 ) / 100 ] = ?	[ "0.045388", "4.5388", "453.88", "473.88" ]	A	"answer multiplying 3.242 x 14 = 4.5388 now divide 4.5388 by 100 so , 4.5388 ÷ 100 = 0.045388 ∴ shift the decimal two places to the left as 100 correct option : a"
sciq	sciq_01_07754	What system in both males and females consists of structures that produce reproductive cells, or gametes, and secrete sex hormone?	[ "circulatory system", "immune system", "digestion", "reproductive" ]	D	The reproductive system in both males and females consists of structures that produce reproductive cells, or gametes, and secrete sex hormones. A gamete is a haploid cell that combines with another haploid gamete during fertilization. Sex hormones are chemical messengers that control sexual development and reproduction. The male reproductive system consists of structures that produce male gametes called sperm and secrete the male sex hormone testosterone.
sciq	sciq_01_02420	What are large glaciers that cover a larger area than just a valley?	[ "ice caps", "icebergs", "glacial continents", "ice floes" ]	A	Ice caps are large glaciers that cover a larger area than just a valley. An ice cap can bury an entire mountain range or region ( Figure below ). Glaciers come off of ice caps into valleys.
ARC-Easy	arc_04_01926	Which of the following properties of a substance is conserved during thermal expansion?	[ "mass", "volume", "shape", "distance between particles" ]	A	null
medmcqa	medmcqa_05_02575	Which of the follow ing is not a chest radiographic feature of left atrial enlargement?	[ "Double left heart border", "Elevated left main bronchous", "Splaying of carina", "Enlargement of left atrila appendage" ]	A	Ans. is 'a' i.e., Double left heart border Ref: Sutton 7th/ep. 280; 350]Sings of left atrial enlargementStraightening of left heart border (due to enlargement of left atrial appendage).Elevation of left main bronchus with widening (Splaying) of carina.Double density (atrial) sign.Posterior displacement of esophagus on barium swallow.Prominent posterosuperior part of cardiac shadow.
math_qa	mathqa_03_00417	a man sitting in a train which is traveling at 30 kmph observes that a goods train , traveling in opposite direction , takes 9 seconds to pass him . if the goods train is 280 m long , find its speed . ?	[ "50 kmph", "82 kmph", "62 kmph", "65 kmph" ]	B	"relative speed = 280 / 9 m / sec = ( ( 280 / 9 ) * ( 18 / 5 ) ) kmph = 112 kmph . speed of goods train = ( 112 - 30 ) kmph = 82 kmph . answer : b ."
ARC-Easy	arc_04_00955	An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorbed. What color will this apple appear to be when struck by blue light?	[ "black", "blue", "red", "white" ]	A	null
sciq	sciq_01_04831	Mutation creates new genetic variation in what?	[ "mutation pool", "gene pool", "disease pool", "form pool" ]	B	Mutation creates new genetic variation in a gene pool.
openbookqa	obqa_02_03608	Many species have small amounts of magnetite to guide during their	[ "hibernation", "migration", "metamorphosis", "spawning" ]	B	Earth 's magnetic patterns are used for finding locations by animals that migrate
medmcqa	medmcqa_05_01230	Which of the following drugs acts on trabecular mesh work and affects the aqueous outflow?	[ "Timolol", "Pilocarpine", "Brimonidine", "Brirzolamide" ]	B	mode of action of ocular hypotensive drugs Pilocarpine is the only drug acting mainly on the trabecular meshwork pilocarpine- cholinomimetic ESSENTIALS OF MEDICAL PHARMACOLOGY;7TH EDITION; KD TRIPATHI;PAGE NO 154
ARC-Easy	arc_04_01917	Changes in the weather are important to people living in Alaska. Which two tools best help scientists to share information about weather?	[ "radio and computer", "clock and notebook", "television and hand lens", "microscope and telephone" ]	A	null
openbookqa	obqa_02_00651	which one of these would be most nourished?	[ "a person who eats once daily", "a person fasting all day", "a person who only drinks water", "a person who feeds thrice daily" ]	D	an animal needs to eat food for nutrients
medmcqa	medmcqa_05_01364	Which bacteria has peritrichous flagella	[ "V. Cholerae", "Pseudomonas", "Alcaligenes faecalis", "Listeria" ]	D	Peritrichous - Flagella all over Ex:- E.Coli Proteus Listeria.
medmcqa	medmcqa_05_03307	Which of the following is an indicator for sterilization by autoclave method	[ "B subtilis", "B stereothermophilus", "S aureus", "Clostridium tetani" ]	B	Bacillus stearothermophillus is used as the test organism. This is a thermophillus organism with an optimum growth temperature of 55-60degc and its spores require exposure of 12 min at 121degc to be killed Paper strips impregnated with (10)6 spores are dried at room temperature and placed in different They are then inoculated into suitable recovering medium and incubated for the sterility test at 55degc for five days
sciq	sciq_01_04263	Where does all igneous rock come from?	[ "the moon", "oceans", "magma or lava", "stratosphere" ]	C	Great volcanic explosions and glowing red rivers of lava are fascinating. All igneous rock comes from magma or lava. Remember that magma is molten rock that is below Earth's surface. Lava is molten rock at Earth's surface.
openbookqa	obqa_02_03466	What has a negative impact on photosynthesis?	[ "light", "sun", "gloom", "sun rays" ]	C	darkness has a negative impact on photosynthesis
openbookqa	obqa_02_04502	At a specific point in a frigid month, the waking hours illumination will be	[ "ending sooner", "overwhelming hot", "lasting the longest", "growing new plants" ]	A	the amount of daylight is least on the winter solstice
math_qa	mathqa_03_02896	a can do a job in 30 days and b can do it in 30 days . a and b working together will finish twice the amount of work in - - - - - - - days ?	[ "14 days", "26 days", "30 days", "31 days" ]	C	"c 1 / 30 + 1 / 30 = 1 / 15 15 * 2 = 30 days"
sciq	sciq_01_02361	Reactive elements are able to combine more what with other elements?	[ "symmetrically", "easily", "quickly", "slowly" ]	B	Reactive elements combine easily with other elements. This explains why they usually exist in nature in compounds rather than in pure form.
sciq	sciq_01_02344	Dominant alleles rarely cause what type of disorders, since the mutant allele is likely to die out of the population?	[ "sex-linked disorders", "genetic disorders", "cancers", "mutations" ]	B	Few genetic disorders are controlled by dominant alleles. A mutant dominant allele is expressed in every individual who inherits even one copy of it. If it causes a serious disorder, affected people may die young and fail to reproduce. Therefore, the mutant dominant allele is likely to die out of the population.
math_qa	mathqa_03_01274	a and b ’ s salaries together amount to rs . 2,000 . a spends 95 % of his salary and b spends 85 % of his . if now their savings are the same , what is a ’ s salary ?	[ "rs . 500", "rs . 750", "rs . 1250", "rs . 1500" ]	D	"explanation : ( 5 / 100 ) a = ( 15 / 100 ) b a = 3 b a + b = 2000 4 b = 2000 = > b = 500 a = 1500 answer is d"
openbookqa	obqa_02_01099	Paleontologists study	[ "Stars", "Grass", "Old Animal Feces", "Cats" ]	C	An example of a fossil is a paw print in rock
openbookqa	obqa_02_00305	A balloon is filled with Helium, and then is opened and pressed up to someone's mouth to make a voice high, why does it do this?	[ "gas fills the new area", "gas easily is dispersed", "gas moves around freely", "gas is lighter than air" ]	A	when a gas in an open container evaporates, that gas spreads out into the air
math_qa	mathqa_03_03657	what is the cp of rs 100 stock at 4 discount , with 1 / 5 % brokerage ?	[ "96.9", "96.3", "96.2", "96.7" ]	C	explanation : use the formula , cp = 100 – discount + brokerage % cp = 100 - 4 + 1 / 5 96.2 thus the cp is rs 96.2 . answer : c
openbookqa	obqa_02_03200	An electrical conductor is a vehicle for what?	[ "people", "water", "sunlight", "zapping energy" ]	D	An electrical conductor is a vehicle for the flow of electricity
medmcqa	medmcqa_05_04443	Weight of an infant doubles by what age?	[ "6 months", "1 year", "2 years", "3 years" ]	A	Ans. is 'a' i.e., 6 months *Weight of an infant doubles by 5 months and quadruples by 2 years of age.AgeWeightBirth3kg5 months6kg (2 x birth weight)1 years9kg (3 x birth weight)2 years12kg (4 x birth weight)3 years15kg (5 x birth weight)5 years18kg (6 x birth weight)7 years21kg (7 x birth weight)10 years30kg (10 x birth weight)
openbookqa	obqa_02_00899	what makes food cooking possible?	[ "a temperature rise on it", "the washing of it", "the taste of it", "none of these" ]	A	cooking food requires adding heat energy
math_qa	mathqa_03_02413	sandy buys an old scooter for $ 800 and spends $ 200 on its repairs . if sandy sells the scooter for $ 1200 , what is the gain percent ?	[ "15 %", "18 %", "20 %", "22 %" ]	C	selling price / total cost = 1200 / 1000 = 1.2 the gain percent is 20 % . the answer is c .
openbookqa	obqa_02_02596	A car hitting a rolling boulder can cause the car to	[ "increase in value", "wet itself", "play the radio", "decrease momentum" ]	D	a force acting on an object in the opposite direction that the object is moving can cause that object 's speed to decrease in a forward motion
math_qa	mathqa_03_02575	a man buy a book in rs 50 & sale it rs 50 . what is the rate of profit ? ? ?	[ "10 %", "0 %", "30 %", "25 %" ]	B	"cp = 50 sp = 50 profit = 50 - 50 = 0 % = 0 / 50 * 100 = 0 % answer : b"
openbookqa	obqa_02_03567	Which of the following provides the best reason for squirrels vacating their forest?	[ "The forest is overrun with chipmunks", "The forest is being harvested for lumber", "Many acorns can be found on the forest floor", "They want to start a new life" ]	B	if a habitat is removed then that habitat is destroyed
math_qa	mathqa_03_02008	a and b can do a work in 8 days , b and c can do the same work in 12 days . a , b and c together can finish it in 6 days . a and c together will do it in ?	[ "8", "4", "6", "12" ]	A	( a + b + c ) ' s 1 day work = 1 / 6 ; ( a + b ) ' s 1 day work = 1 / 8 ( b + c ) ' s 1 day work = 1 / 12 ( a + c ) ' s 1 day work = ( 2 * 1 / 6 ) - ( 1 / 8 + 1 / 12 ) = ( 1 / 3 - 5 / 24 ) = 1 / 8 so , a and c together will do the work in 8 days . answer a
math_qa	mathqa_03_02775	an empty tank be filled with an inlet pipe ‘ a ’ in 42 minutes . after 12 minutes an outlet pipe ‘ b ’ is opened which can empty the tank in 30 minutes . after 6 minutes another inlet pipe ‘ c ’ opened into the same tank , which can fill the tank in 35 minutes and the tank is filled . find the time taken to fill the tank ?	[ "51.6", "51.5", "51.7", "51.1" ]	B	assume total tank capacity = 210 liters now capacity of pipe a = 210 / 42 = 5 liters capacity of b = 210 / 30 = - 7 liters capacity of c = 210 / 35 = 6 min assume tank gets filled in x min after the third pipe got opened . so x × 5 + 6 × ( − 2 ) + 4 x = 210 x × 5 + 6 × ( − 2 ) + 4 x = 210 ⇒ 48 + 4 x = 210 ⇒ 4 x = 162 ⇒ x = 40.5 ⇒ 48 + 4 x = 210 ⇒ 4 x = 162 ⇒ x = 40.5 total time taken to fill the tank = 40.5 + 12 + 6 = 51.5 answer : b
medmcqa	medmcqa_05_00261	Warfarin embryopathy is due to action of:	[ "Osteophysin", "Osteotensin", "Osteocalcin", "Osteogenin" ]	C	Ans: (c) OsteocalcinRef: style="font-size: 1.04761904761905em; font-family: Times New Roman, Times, serif; margin: 0 0 0 4px">Warfarin embryopathyThe process of osteocalcin carboxylation in human bone formation is a vitamin K-dependent process and that circulating osteocalcin will be altered structurally by warfarin administrationThis finding has pathophysiological implications for: o Fetal warfarin embryopathy syndromeBone disease associated with chronic liver diseasesOsteoporosisIn all the above conditions vitamin K deficiency has been implicated Note:The similarity between fetal warfarin syndrome and X-linked recessive chondroplasia puntata has suggested a common pathogenesis for these two disorders. Warfarin appears to inhibit arylsulfatase, a genetically determined deficiency which is responsible for chondroplasia puntata.
sciq	sciq_01_01058	What type of change has occurred when a copper penny changes color?	[ "chemical change", "reactive change", "contamination change", "carbon change" ]	A	Some of these pennies are shiny and copper colored. That’s how pennies look when they are new. The older pennies are dull and brown. Copper at the surface of these pennies has combined with air to become a different substance with different properties. The change in color shows that a chemical change has occurred.
openbookqa	obqa_02_02974	When the amount of food goes down, the amount of conflict between the organisms searching for it will	[ "nothing.", "remain the same", "go down", "go up" ]	D	as the population of prey decreases , competition between predators will increase
math_qa	mathqa_03_00829	if 6 a = 7 b = 20 , then 84 ab =	[ "50", "100", "625", "800" ]	D	"6 a * 7 b = 20 * 20 = 400 42 ab = 400 i . e . 84 ab = 800 answer : option d"
sciq	sciq_01_01815	What type of ionic compound is formed from acid and bases reacting with each other?	[ "isolated", "common", "dry", "salt" ]	D	Acids have some properties in common. They turn litmus, a plant extract, red. They react with some metals to give off H2 gas. They react with carbonate and hydrogen carbonate salts to give off CO2 gas. Acids that are ingested typically have a sour, sharp taste. (The name acid comes from the Latin word acidus, meaning “sour. ”) Bases also have some properties in common. They are slippery to the touch, turn litmus blue, and have a bitter flavor if ingested. Acids and bases have another property: they react with each other to make water and an ionic compound called a salt. A salt, in chemistry, is any ionic compound made by combining an acid with a base. A reaction between an acid and a base is called a neutralization reaction and can be represented as follows: acid + base → H2O + salt The stoichiometry of the balanced chemical equation depends on the number of H+ions in the acid and the number of OH− ions in the base.
medmcqa	medmcqa_05_04337	Drug of choice for bacterial vaginosis: March 2011	[ "Ciprofloxacin", "Doxycycline", "Teracycline", "Metronidazole" ]	D	Ans. D: Metronidazole The 7-day course of metronidazole 500 mg twice daily is effective in 85% of courses of bacterial/ gardnerella vaginosis, whereas a single dose of 2 gm cures only 45%.
ARC-Easy	arc_04_00800	Salt and pepper are placed together in a container. When the container is shaken, the salt and pepper become a	[ "liquid.", "mixture.", "solution.", "suspension." ]	B	null
math_qa	mathqa_03_01044	4 mat - weavers can weave 4 mats in 4 days . at the same rate , how many mats would be woven by 6 mat - weavers in 6 days ?	[ "25", "9", "39", "61" ]	B	"let the required number of bottles be x . more weavers , more mats ( direct proportion ) more days , more mats ( direct proportion ) wavers 4 : 6 : : 4 : x days 4 : 6 4 * 4 * x = 6 * 6 * 4 x = ( 6 * 6 * 4 ) / ( 4 x 4 ) x = 9 . answer is b ."
sciq	sciq_01_09231	The epochs of the universe are known back to very shortly after what 'explosive' event?	[ "major bang", "Explosive bang", "Biggest bang", "big bang" ]	D	H0 = 20km/s ⋅ Mly. • Explanations of the large-scale characteristics of the universe are intimately tied to particle physics. • The dominance of matter over antimatter and the smoothness of the CMBR are two characteristics that are tied to particle physics. • The epochs of the universe are known back to very shortly after the Big Bang, based on known laws of physics. • The earliest epochs are tied to the unification of forces, with the electroweak epoch being partially understood, the GUT epoch being speculative, and the TOE epoch being highly speculative since it involves an unknown single superforce. • The transition from GUT to electroweak is called spontaneous symmetry breaking. It released energy that caused the inflationary scenario, which in turn explains the smoothness of the CMBR.
sciq	sciq_01_06576	Embryos usually don't survive if they have extra or too few of these genetic units?	[ "chromosomes", "genes", "phenotypes", "ribosomes" ]	A	Outside of chromosome 21 and the sex chromosomes, most embryos with extra chromosomes do not usually survive. Because chromosomes carry many, many genes, a disruption of a chromosome can cause severe problems with the development of a fetus. Individuals with one (or more) fewer chromosome usually don't survive either. Can you explain why?.
sciq	sciq_01_05623	X and y are the labels of what specialized human chromosomes?	[ "protein chromosomes", "carb chromosomes", "exotic chromosomes", "sex chromosomes" ]	D	The 24 human chromosomes. The autosomes are numbered 1 - 22, based on size, with chromosome 1 being the largest. The X and Y sex chromosomes are shown in the box.
sciq	sciq_01_04924	Ocean water releases dissolved carbon dioxide into the atmosphere when what happens to the temperature?	[ "it rises", "Drops", "Later", "Goes Down" ]	A	Ocean water releases dissolved carbon dioxide into the atmosphere when water temperature rises.
sciq	sciq_01_10861	What is the first and longest phase of mitosis known as?	[ "metaphase", "prophase", "anaphase", "telophase" ]	B	Prophase is the first and longest phase of mitosis, see Figure below . During prophase, the chromatin (DNA) coils up into visible chromosomes, each made up of two sister chromatids held together by the centromere. Also during this phase, the nucleolus disappears, and the spindle begins to form from the centrioles. Most eukaryotic cells contain structures known as centrosomes, consisting of a pair of centrioles. During prophase, the centrioles begin to move to opposite ends, or poles, of the cell. As the centrioles migrate, the fiber-like spindle begins to elongate between the centrioles. The spindle is a thin, cage-like structure made out of microtubules. In plant cells, the spindle forms without centrioles. The spindle plays an essential role moving chromosomes and in the separation of sister chromatids.
openbookqa	obqa_02_01770	Adults that go through incomplete metamorphosis may have	[ "love", "feelings", "horns", "attached flying contraptions" ]	D	incomplete metamorphosis is when an insect reaches the adult stage without being a pupa
openbookqa	obqa_02_02335	A hurricane over and near water will be strong, and as it travels further from the sea it	[ "explodes", "expands", "dies down", "grows" ]	C	when a hurricane moves over land , that hurricane will decrease in strength
sciq	sciq_01_02499	What occurs as a result of the discharge of static electricity?	[ "clouds", "drought", "lightning", "thunder" ]	C	Zachary Wilson. Lightning is the result of the discharge of static electricity . CC BY-NC 3.0.
medmcqa	medmcqa_05_04815	External hemorrhoids below the dentate line are:	[ "Painful", "Ligation is done as management", "Skin tag is not seen in these cases", "May turn malignant" ]	A	Ans. a. Painful (Ref: Sabiston 19/e p1387-1391; Schwartz 9/e p1057-1059; Bailey 26/e p1250-1257, 25/e p1253-1259; Schackelford 7/e p1896-1906)External hemorrhoids are located below dentate line and are painful.External Hemorrhoids:Located distal to dentate lineQAlso known as 5-days painful self curing lesionPainful, not ligatedQExcision is doneQRepeated thrombosis leads to semi-ripe black current appearanceHemorrhoidRecent theories regard hemorrhoids as normal anatomical structuresQ.These are cushions of submucosal tissue containing venules, arterioles, smooth muscle fibres and elastic connective tissue.Three hemorrhoidal cushions are found in the left lateral, right anterior and right posterior position (3, 7 and 11 O' Clock)QHemorrhoids or piles are symptomatic anal cushionsMore common when intra-abdominal pressure is raised, e.g. in obesity, constipation and pregnancySymptoms: bright-red, painless bleeding, mucus discharge and prolapseHemorrhoids cannot be palpated, best diagnosed by proctoscopyQ.Internal HemorrhoidsExternal Hemorrhoids* Located proximal to the dentate lineQ* Painless, can be ligatedQ* Banding is preferredQ* Located distal to dentate lineQ* Also known as 5-days painful self curing lesion* Painful, not ligatedQ* Excision is doneQ* Repeated thrombosis leads to semi-ripe black current appearanceQ Classification of Internal hemorrhoids1st degreePainless bleedingQ, no prolapse2nd degreeProlapse through the anus, on straining but reduce spontaneouslyQ3rd degreeProlapse through the anal canal and require manual reductionQ4th degreePermanently prolapsed and cannot be manually reduced.QTreatment:Mere presence of hemorrhoids is not necessarily an indication of treatment.Treatment is only indicated if they are symptomatic. Best treatment is the least invasive one which is possible to alleviate the symptomsQ.Treatment of hemorrhoidsMedical therapy* Bleeding from 1st and 2nd degree hemorrhoids often improve with the addition of dietary fibre, stool softeners and other diet regulationQ.Rubber band ligation* Done for 1st, 2nd and selected 3rd degree hemorrhoidsQInfrared Photocoagulation* Done for 1st and 2nd degree hemorrhoidsSclerotherapy* Done for 1+, 2nd and selected 3rd degree hemorrhoidsQ* Most commonly used sclerosant is 5% phenol in almond or arachis oil.OperativehemorrhoidectomyQ* 3rd and 4th degree hemorrhoidQ* 2nd degree not cured by non-operative methodsQ* Mixed (combine internal/external hemorrhoids)Q* Fibrosed hemorrhoidsOperative HemorrhoidectomyMilligan-Morgan open hemorrhoidectomyQFerguson closed hemorrhoidectomyQWhitefield submucosal hemorrhoidectomyQLonga's stapler hemorrhoidectomyQ
math_qa	mathqa_03_00276	a grocer has a sale of rs . 6435 , rs . 6927 , rs . 6855 , rs . 7230 and rs . 6562 for 5 consecutive months . how much sale must he have in the sixth month so that he gets an average sale of rs . 6700 ?	[ "s . 4991", "s . 5991", "s . 6001", "s . 6191" ]	D	"total fr 5 mnths = ( 6435 + 6927 + 6855 + 7230 + 6562 ) = rs 34009 . reqd . sale = rs . [ ( 6700 * 6 ) - 34009 ] = rs . ( 40200 - 34009 ) = rs . 6191 . answer : d"
openbookqa	obqa_02_02957	Before their trip to the Amazon Bill and Jane had sharp metal objects stuck into their arms by a doctor.	[ "they were getting ice water injected so they would stay cool in the Amazon", "they wanted to avoid contracting something", "aliens performed experiments on them", "they wanted to catch the flu" ]	B	vaccines can help prevent illness
sciq	sciq_01_08944	What's the term for a relationship between two organisms where at least one benefits?	[ "symbiosis", "meiosis", "morphogenesis", "dermatitis" ]	A	Symbiosis is a close relationship between organisms of different species in which at least one of the organisms benefits. The other organism may also benefit, or it may be unaffected or harmed by the relationship. Figure below shows an example of symbiosis. The birds in the picture are able to pick out food from the fur of the deer. The deer won't eat the birds. In fact, the deer knowingly lets the birds rest on it. What, if anything, do you think the deer gets out of the relationship?.
math_qa	mathqa_03_04839	if the cost price is 25 % of selling price . then what is the profit percent .	[ "150 %", "200 %", "300 %", "350 %" ]	C	"explanation : let the s . p = 100 then c . p . = 25 profit = 75 profit % = ( 75 / 25 ) * 100 = 300 % . answer : c"
openbookqa	obqa_02_04624	This likely relies on a circuit being closed	[ "your iPhone charger", "your hair brush", "your hat", "your shoes" ]	A	when a switch in a simple series circuit is closed , electricity will flow through the circuit
math_qa	mathqa_03_00967	how many positive integers less than 248 are multiple of 4 but not multiples of 6 ?	[ "20", "41", "42", "53" ]	B	"244 / 4 = 61 multiples of 4 which are a multiple of 6 will be of the form 2 * 2 * 3 = 12 n where n > 0 240 / 12 = 20 61 - 20 = 41 answer : b"
openbookqa	obqa_02_02691	Which would feel hotter?	[ "a stove on the fingertips", "a stove on the butt", "a fridge on the butt", "a fridge on the fingertips" ]	A	if an object is hot then the surfaces of that object are hot
math_qa	mathqa_03_04130	if n is a positive integer and the product of all the integers from 1 to n , inclusive , is a multiple of 9 , what is the least possible value of n ?	[ "7", "6", "9", "12" ]	B	we need at least 2 factors of three , which means n must be at least 6 , so b is the correct answer .
math_qa	mathqa_03_04158	what is the least number . which should be added to 221 to make it a perfect square ?	[ "5", "8", "4", "6" ]	C	"221 + 4 = 225 15 ^ 2 answer : c"
sciq	sciq_01_06090	The scale that is used to measure the loudness of sound measures their loudness in what?	[ "decibels", "centimeters", "waves", "weight" ]	A	The most common cause of hearing loss is exposure to loud sounds. Loud sounds can damage hair cells inside the ears. Hair cells change sound waves to electrical signals that the brain can interpret as sounds. Louder sounds, which have greater intensity than softer sounds, can damage hair cells more quickly than softer sounds. You can see the relationship between sound intensity, exposure time, and hearing loss in the following Figure below . The intensity of sounds is measured in decibels (dB).
openbookqa	obqa_02_04228	If a person wants to watch the eclipse	[ "it's best to go without sunglasses", "it's best to use a telescope", "it's best to just look at it", "it's best to use eye protection" ]	D	a solar eclipse could only happen during the new moon
sciq	sciq_01_00333	What is the outer layer of an axon that acts like a layer of insulation, similar to the plastic that encases an electrical cord?	[ "nerve sheath", "lipids sheath", "myelin sheath", "layer sheath" ]	C	The axon of many neurons has an outer layer called a myelin sheath (see Figure above ). Myelin is a lipid produced by a type of a glial cell known as a Schwann cell. The myelin sheath acts like a layer of insulation, similar to the plastic that encases an electrical cord. Regularly spaced nodes, or gaps, in the myelin sheath allow nerve impulses to skip along the axon very rapidly.
sciq	sciq_01_08374	Transverse divisions are associated with leaf elongation, and longitudinal divisions are associated with what?	[ "leaf shedding", "leaf broadening", "leaf multiplying", "leaf coloring" ]	B
ARC-Easy	arc_04_00941	Which action involving a pulley system requires the least amount of force?	[ "using several pulleys together instead of a single pulley", "using a fixed pulley instead of a moveable pulley", "pulling a long rope instead of a short rope", "pulling a rope up instead of down" ]	A	null
math_qa	mathqa_03_03338	a can do a work in 9 days and b can do the same work in 18 days . if they work together , in how many days will they complete the work ?	[ "6 days", "7 days", "5 days", "3 days" ]	A	one day ' s work of a and b = 1 / 9 + 1 / 8 = ( 2 + 1 ) / 18 = 1 / 6 so , the time taken to complete the work is 6 days . answer : a
sciq	sciq_01_04783	Sudden changes in geologic and climatic conditions can spur what process?	[ "cloning", "generation", "evolution", "symbiosis" ]	C	When geologic and climatic conditions are changing, evolution may occur more quickly. Thus, long periods of little change may be interrupted by bursts of rapid change. This model of the timing of evolution is called punctuated equilibrium . It is better supported by the fossil record than is gradualism. This model suggests that niches left open by sudden geologic and climatic changes may be rapidly filled by bursts of evolution.
sciq	sciq_01_07819	What is the only marsupial in north america?	[ "Raccoon", "oppossum", "Didelphinae", "Marmosa" ]	B	Most people think of opossums as scary creatures. Is this because they look kind of funny, walk kind of funny, have beady eyes and sharp teeth, and can emit a very foul odor? Maybe. But what is so different about opossums is that they are the only marsupial in North America.
sciq	sciq_01_04137	What kind of bonds, where electrons are transferred rather than shared, are considered the ultimate in polarity?	[ "ionic bonds", "soluble bonds", "magnetic bonds", "covalent bonds" ]	A	polar, while others are strongly polar. Ionic bonds can be considered the ultimate in polarity, with electrons being transferred rather than shared. To judge the relative polarity of a covalent bond, chemists use electronegativity, which is a relative measure of how strongly an atom attracts electrons when it forms a covalent bond. There are various numerical scales for rating electronegativity. Figure 4.4 "Electronegativities of Various Elements" shows one of the most popular—the Pauling scale. The polarity of a covalent bond can be judged by determining the difference in the electronegativities of the two atoms making the bond. The greater the difference in electronegativities, the greater the imbalance of electron sharing in the bond. Although there are no hard and fast rules, the general rule is if the difference in electronegativities is less than about 0.4, the bond is considered nonpolar; if the difference is greater than 0.4, the bond is considered polar. If the difference in electronegativities is large enough (generally greater than about 1.8), the resulting compound is considered ionic rather than covalent. An electronegativity difference of zero, of course, indicates a nonpolar covalent bond.
openbookqa	obqa_02_04047	Where is a mama bear likely to find food?	[ "on top of the highest trees", "in the deepest mines", "in the inside of a felled oak", "at the bottom of the lake" ]	C	bears eat insects
sciq	sciq_01_03606	Coal, oil and natural gas are types of what formed from the remains of once living organisms?	[ "fossil compounds", "living fossils", "crop fuels", "fossil fuels" ]	D	Coal, oil and natural gas are all fossil fuels formed from the remains of once living organisms.
math_qa	mathqa_03_04119	solution a is 20 % sugar and solution b is 80 % sugar . if you have 30 ounces of solution a and 60 ounces of solution b , in what ratio could you mix solution a with solution b to produce 50 ounces of a 50 % sugar solution ?	[ "6 : 4", "6 : 14", "4 : 4", "4 : 6" ]	C	forget the volumes for the time being . you have to mix 20 % and 80 % solutions to get 50 % . this is very straight forward since 50 is int he middle of 20 and 80 so we need both solutions in equal quantities . if this does n ' t strike , use w 1 / w 2 = ( a 2 - aavg ) / ( aavg - a 1 ) w 1 / w 2 = ( 80 - 50 ) / ( 50 - 20 ) = 1 / 1 so the volume of the two solutions will be equal . answer has to be 4 : 4 = c
sciq	sciq_01_00675	Humans are unique in their ability to alter their environment with the conscious purpose of increasing what, which acts as a limiting factor on populations in general?	[ "density dependent limitation", "carrying capacity", "containing capacity", "niche" ]	B	Overcoming Density-Dependent Regulation Humans are unique in their ability to alter their environment with the conscious purpose of increasing its carrying capacity. This ability is a major factor responsible for human population growth and a way of overcoming density-dependent growth regulation. Much of this ability is related to human intelligence, society, and communication. Humans can construct shelter to protect them from the elements and have developed agriculture and domesticated animals to increase their food supplies. In addition, humans use language to communicate this technology to new generations, allowing them to improve upon previous accomplishments. Other factors in human population growth are migration and public health. Humans originated in Africa, but have since migrated to nearly all inhabitable land on the Earth. Public health, sanitation, and the use of antibiotics and vaccines have decreased the ability of infectious disease to limit human population growth. In the past, diseases such as the bubonic plaque of the fourteenth century killed between 30 and 60 percent of Europe’s population and reduced the overall world population by as many as 100 million people. Today, the threat of infectious disease, while not gone, is certainly less severe. According to the World Health Organization, global death from infectious disease declined from 16.4 million in 1993 to 14.7 million in 1992. To compare to some of the epidemics of the past, the percentage of the world's population killed between 1993 and 2002 decreased from 0.30 percent of the world's population to 0.24 percent. Thus, it appears that the influence of infectious disease on human population growth is becoming less significant.
sciq	sciq_01_05952	The strong affinity of concentrated sulfuric acid for water makes it a good agent of what?	[ "hydrating", "diluting", "concentrating", "dehydrating" ]	D	The strong affinity of concentrated sulfuric acid for water makes it a good dehydrating agent. It is possible to dry gases and immiscible liquids that do not react with the acid by passing them through the acid. Sulfuric acid is a strong diprotic acid that ionizes in two stages. In aqueous solution, the first stage is essentially complete. The secondary ionization is not nearly so complete, and HSO 4 − is a moderately strong acid (about 25% ionized in solution of a HSO 4 − salt: Ka = 1.2 × 10−2). Being a diprotic acid, sulfuric acid forms both sulfates, such as Na2SO4, and hydrogen sulfates, such as NaHSO4. Most sulfates are soluble in water; however, the sulfates of barium, strontium, calcium, and lead are only slightly soluble in water. Among the important sulfates are Na2SO4⋅10H2O and Epsom salts, MgSO4⋅7H2O. Because the HSO 4 − ion is an acid, hydrogen sulfates, such as NaHSO4, exhibit acidic behavior, and this compound is the primary ingredient in some household cleansers. Hot, concentrated sulfuric acid is an oxidizing agent. Depending on its concentration, the temperature, and the strength of the reducing agent, sulfuric acid oxidizes many compounds and, in the process, undergoes reduction to SO2, HSO 3 −, SO 3 2−, S, H2S, or S2−. Sulfur dioxide dissolves in water to form a solution of sulfurous acid, as expected for the oxide of a nonmetal. Sulfurous acid is unstable, and it is not possible to isolate anhydrous H2SO3. Heating a solution of sulfurous acid expels the sulfur dioxide. Like other diprotic acids, sulfurous acid ionizes in two steps: The hydrogen sulfite ion, HSO 3 −, and the sulfite ion, SO 3 2−, form. Sulfurous acid is a moderately strong acid. Ionization is about 25% in the first stage, but it is much less in the second (Ka1 = 1.2 × 10−2 and Ka2 = 6.2 × 10−8). In order to prepare solid sulfite and hydrogen sulfite salts, it is necessary to add a stoichiometric amount of a base to a sulfurous acid solution and then evaporate the water. These salts also form from the reaction of SO2 with oxides and hydroxides. Heating solid sodium hydrogen sulfite forms sodium sulfite, sulfur dioxide, and water: Δ.
sciq	sciq_01_03375	What topographic feature does a circle with inward hatches represent on a contour map?	[ "vegetation", "a lake", "a depression", "a mountain" ]	C	On a contour map, a circle with inward hatches indicates a depression.
math_qa	mathqa_03_00885	what is the sum of the multiples of 4 from 40 to 80 , inclusive ?	[ "560", "660", "800", "760" ]	B	"the formula we want to use in this type of problem is this : average * total numbers = sum first , find the average by taking the sum of the f + l number and divide it by 2 : a = ( f + l ) / 2 second , find the total numbers in our range by dividing our f and l numbers by 4 and add 1 . ( 80 / 4 ) - ( 40 / 4 ) + 1 multiply these together so what we show average * total numbers = sum ( 80 + 40 ) / 2 * ( 80 / 4 ) - ( 40 / 4 ) + 1 = sum 60 * 11 = 660 b"
medmcqa	medmcqa_05_00455	During appendectomy if it is noticed that base of appendix is inflammed then fuher line of treatment is	[ "No appendicectomy", "No burrying of stump", "Hemicolectomy", "Cecal resection" ]	B	Ans. is 'b' i.e. No burrying of stump
math_qa	mathqa_03_04752	find the area of trapezium whose parallel sides are 28 cm and 20 cm long , and the distance between them is 21 cm ?	[ "288 cm 2", "277 cm 2", "504 cm 2", "510 cm 2" ]	C	"area of a trapezium = 1 / 2 ( sum of parallel sides ) * ( perpendicular distance between them ) = 1 / 2 ( 28 + 20 ) * ( 21 ) = 504 cm 2 answer : c"
sciq	sciq_01_00437	What vesicles store neurotransmitters?	[ "Golgi apparatus", "dendritic", "hydrophobic", "synaptic" ]	D	Secretory Vesicles contain materials that are to be excreted from the cell, such as wastes or hormones . Secretory vesicles include synaptic vesicles and vesicles in endocrine tissues. Synaptic vesicles store neurotransmitters. They are located at presynaptic terminals in neurons. When a signal reaches the end of an axon, the synaptic vesicles fuse with the cell membrane and release the neurotransmitter. The neurotransmitter crosses the synaptic junction, and binds to a receptor on the next cell. Some cells also produce molecules, such as hormones produced by endocrine tissues, needed by other cells. These molecules are stored in secretory vesicles and released when needed. Secretory vesicles also hold enzymes needed to make extracellular structures, such as the extracellular matrix of animal cells.
sciq	sciq_01_00491	Gases such as co2 and methane can trap what energy in earth's atmosphere, before radiating it into space?	[ "potential energy", "sunlight energy", "mechanical energy", "thermal energy" ]	D	Thermal energy can be trapped in Earth’s atmosphere by gases such as CO2, water vapor, methane, and chlorofluorocarbons before it can be radiated into space—like the effect of a greenhouse. It is not yet clear how large an increase in the temperature of Earth’s surface can be attributed to this phenomenon. Venus is an example of a planet that has a runaway greenhouse effect. The atmosphere of Venus is about 95 times denser than that of Earth and contains about 95% CO2. Because Venus is closer to the sun, it also receives more solar radiation than Earth does. The result of increased solar radiation and high CO2 levels is an average surface temperature of about 450°C, which is hot enough to melt lead. Data such as those in Figure 5.22 "Changes in Atmospheric CO" indicate that atmospheric levels of greenhouse gases have increased dramatically over the past 100 years, and it seems clear that the heavy use of fossil fuels by industry is largely responsible. It is not clear, however, how large an increase in temperature (global warming) may result from a continued increase in the levels of these gases. Estimates of the effects of doubling the preindustrial levels of CO2 range from a 0°C to a 4.5°C increase in the average temperature of Earth’s surface, which is currently about.
openbookqa	obqa_02_02159	The body of creatures may have nutrients delivered to various areas based on where	[ "hair grows", "nails are trimmed", "vessels travel", "birds exist" ]	C	arteries transport nutrients throughout the body
sciq	sciq_01_02189	Which kind of irrigation uses much less water than other methods?	[ "solar", "drip", "constant", "mist" ]	B	Drip irrigation uses much less water than other methods.
sciq	sciq_01_04802	What is the name for a kind of animal that eats a mix of plant and animal foods.	[ "an smorgasbord", "an omnivore", "an herbivore", "a carnivore" ]	B	Some mammals are omnivores. Omnivores are heterotrophs that eat a mix of plant and animal foods. Mammals that are omnivores include bears, foxes, rats, pigs, and human beings. The chimpanzees in Figure below are also omnivorous mammals. In the wild, they eat mainly plant foods, but they supplement plants with birds, bird eggs, insects, small monkeys, and other small mammals. Their favorite and most common food, however, is fruit. Animals that eat mainly fruit are called frugivores.
sciq	sciq_01_05668	Producing sperm and secreting testosterone are the main functions of what system?	[ "pollination", "male reproductive system", "female reproductive system", "endocrine system" ]	B	The main functions of the male reproductive system are to produce sperm and secrete testosterone.
ARC-Easy	arc_04_00477	What chemical symbol represents the element iron?	[ "Fe", "I", "Ir", "Pb" ]	A	null
sciq	sciq_01_09864	What kind of lakes form when volcanic eruptions create holes that fill with water?	[ "novel lakes", "crater lakes", "formation lakes", "artificial lakes" ]	B	Other lakes are crater lakes or rift lakes ( Figure below ). Crater lakes form when volcanic eruptions create craters that fill with water. Rift lakes form when movements of tectonic plates create low places that fill with water.

sciq

sciq_01_01661

What do some plants produce that protects dormant seeds and aids in their dispersal?

[ "leaves", "roots", "fruit", "stems" ]

C

sciq

sciq_01_10417

What do we call animals that have a backbone and belong to the phylum chordata?

[ "organelles", "mammals", "vertebrates", "invertebrates" ]

C

Vertebrates are animals that have a backbone. All of them are placed in the Phylum Chordata. Modern vertebrates include fish, amphibians, reptiles, birds, and mammals. Only about 5 percent of animal species are vertebrates.

ARC-Challenge

arc_04_02652

A student is measuring the boiling point of a salt and water mixture. He takes one temperature measurement of 105°C. Which is the best way to ensure the results are valid?

[ "repeat the investigation", "change the volume of water", "add more salt to the mixture", "do the investigation without salt" ]

A

null

sciq

sciq_01_04630

What type of vents are giant tube worms found at?

[ "hydrothermal", "Heated", "temperature", "oxygen" ]

A

Giant tube worms are found at hydrothermal vents. They get food from the chemosynthetic bacteria that live within them. The bacteria provide food; the worms provide shelter.

math_qa

mathqa_03_01913

[ ( 3.242 x 14 ) / 100 ] = ?

[ "0.045388", "4.5388", "453.88", "473.88" ]

A

"answer multiplying 3.242 x 14 = 4.5388 now divide 4.5388 by 100 so , 4.5388 ÷ 100 = 0.045388 ∴ shift the decimal two places to the left as 100 correct option : a"

sciq

sciq_01_07754

What system in both males and females consists of structures that produce reproductive cells, or gametes, and secrete sex hormone?

[ "circulatory system", "immune system", "digestion", "reproductive" ]

D

The reproductive system in both males and females consists of structures that produce reproductive cells, or gametes, and secrete sex hormones. A gamete is a haploid cell that combines with another haploid gamete during fertilization. Sex hormones are chemical messengers that control sexual development and reproduction. The male reproductive system consists of structures that produce male gametes called sperm and secrete the male sex hormone testosterone.

sciq

sciq_01_02420

What are large glaciers that cover a larger area than just a valley?

[ "ice caps", "icebergs", "glacial continents", "ice floes" ]

A

Ice caps are large glaciers that cover a larger area than just a valley. An ice cap can bury an entire mountain range or region ( Figure below ). Glaciers come off of ice caps into valleys.

ARC-Easy

arc_04_01926

Which of the following properties of a substance is conserved during thermal expansion?

[ "mass", "volume", "shape", "distance between particles" ]

A

null

medmcqa

medmcqa_05_02575

Which of the follow ing is not a chest radiographic feature of left atrial enlargement?

[ "Double left heart border", "Elevated left main bronchous", "Splaying of carina", "Enlargement of left atrila appendage" ]

A

Ans. is 'a' i.e., Double left heart border Ref: Sutton 7th/ep. 280; 350]Sings of left atrial enlargementStraightening of left heart border (due to enlargement of left atrial appendage).Elevation of left main bronchus with widening (Splaying) of carina.Double density (atrial) sign.Posterior displacement of esophagus on barium swallow.Prominent posterosuperior part of cardiac shadow.

math_qa

mathqa_03_00417

a man sitting in a train which is traveling at 30 kmph observes that a goods train , traveling in opposite direction , takes 9 seconds to pass him . if the goods train is 280 m long , find its speed . ?

[ "50 kmph", "82 kmph", "62 kmph", "65 kmph" ]

B

"relative speed = 280 / 9 m / sec = ( ( 280 / 9 ) * ( 18 / 5 ) ) kmph = 112 kmph . speed of goods train = ( 112 - 30 ) kmph = 82 kmph . answer : b ."

ARC-Easy

arc_04_00955

An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorbed. What color will this apple appear to be when struck by blue light?

[ "black", "blue", "red", "white" ]

A

null

sciq

sciq_01_04831

Mutation creates new genetic variation in what?

[ "mutation pool", "gene pool", "disease pool", "form pool" ]

B

Mutation creates new genetic variation in a gene pool.

openbookqa

obqa_02_03608

Many species have small amounts of magnetite to guide during their

[ "hibernation", "migration", "metamorphosis", "spawning" ]

B

Earth 's magnetic patterns are used for finding locations by animals that migrate

medmcqa

medmcqa_05_01230

Which of the following drugs acts on trabecular mesh work and affects the aqueous outflow?

[ "Timolol", "Pilocarpine", "Brimonidine", "Brirzolamide" ]

B

mode of action of ocular hypotensive drugs Pilocarpine is the only drug acting mainly on the trabecular meshwork pilocarpine- cholinomimetic ESSENTIALS OF MEDICAL PHARMACOLOGY;7TH EDITION; KD TRIPATHI;PAGE NO 154

ARC-Easy

arc_04_01917

Changes in the weather are important to people living in Alaska. Which two tools best help scientists to share information about weather?

[ "radio and computer", "clock and notebook", "television and hand lens", "microscope and telephone" ]

A

null

openbookqa

obqa_02_00651

which one of these would be most nourished?

[ "a person who eats once daily", "a person fasting all day", "a person who only drinks water", "a person who feeds thrice daily" ]

D

an animal needs to eat food for nutrients

medmcqa

medmcqa_05_01364

Which bacteria has peritrichous flagella

[ "V. Cholerae", "Pseudomonas", "Alcaligenes faecalis", "Listeria" ]

D

Peritrichous - Flagella all over Ex:- E.Coli Proteus Listeria.

medmcqa

medmcqa_05_03307

Which of the following is an indicator for sterilization by autoclave method

[ "B subtilis", "B stereothermophilus", "S aureus", "Clostridium tetani" ]

B

Bacillus stearothermophillus is used as the test organism. This is a thermophillus organism with an optimum growth temperature of 55-60degc and its spores require exposure of 12 min at 121degc to be killed Paper strips impregnated with (10)6 spores are dried at room temperature and placed in different They are then inoculated into suitable recovering medium and incubated for the sterility test at 55degc for five days

sciq

sciq_01_04263

Where does all igneous rock come from?

[ "the moon", "oceans", "magma or lava", "stratosphere" ]

C

Great volcanic explosions and glowing red rivers of lava are fascinating. All igneous rock comes from magma or lava. Remember that magma is molten rock that is below Earth's surface. Lava is molten rock at Earth's surface.

openbookqa

obqa_02_03466

What has a negative impact on photosynthesis?

[ "light", "sun", "gloom", "sun rays" ]

C

darkness has a negative impact on photosynthesis

openbookqa

obqa_02_04502

At a specific point in a frigid month, the waking hours illumination will be

[ "ending sooner", "overwhelming hot", "lasting the longest", "growing new plants" ]

A

the amount of daylight is least on the winter solstice

math_qa

mathqa_03_02896

a can do a job in 30 days and b can do it in 30 days . a and b working together will finish twice the amount of work in - - - - - - - days ?

[ "14 days", "26 days", "30 days", "31 days" ]

C

"c 1 / 30 + 1 / 30 = 1 / 15 15 * 2 = 30 days"

sciq

sciq_01_02361

Reactive elements are able to combine more what with other elements?

[ "symmetrically", "easily", "quickly", "slowly" ]

B

Reactive elements combine easily with other elements. This explains why they usually exist in nature in compounds rather than in pure form.

sciq

sciq_01_02344

Dominant alleles rarely cause what type of disorders, since the mutant allele is likely to die out of the population?

[ "sex-linked disorders", "genetic disorders", "cancers", "mutations" ]

B

Few genetic disorders are controlled by dominant alleles. A mutant dominant allele is expressed in every individual who inherits even one copy of it. If it causes a serious disorder, affected people may die young and fail to reproduce. Therefore, the mutant dominant allele is likely to die out of the population.

math_qa

mathqa_03_01274

a and b ’ s salaries together amount to rs . 2,000 . a spends 95 % of his salary and b spends 85 % of his . if now their savings are the same , what is a ’ s salary ?

[ "rs . 500", "rs . 750", "rs . 1250", "rs . 1500" ]

D

"explanation : ( 5 / 100 ) a = ( 15 / 100 ) b a = 3 b a + b = 2000 4 b = 2000 = > b = 500 a = 1500 answer is d"

openbookqa

obqa_02_01099

Paleontologists study

[ "Stars", "Grass", "Old Animal Feces", "Cats" ]

C

An example of a fossil is a paw print in rock

openbookqa

obqa_02_00305

A balloon is filled with Helium, and then is opened and pressed up to someone's mouth to make a voice high, why does it do this?

[ "gas fills the new area", "gas easily is dispersed", "gas moves around freely", "gas is lighter than air" ]

A

when a gas in an open container evaporates, that gas spreads out into the air

math_qa

mathqa_03_03657

what is the cp of rs 100 stock at 4 discount , with 1 / 5 % brokerage ?

[ "96.9", "96.3", "96.2", "96.7" ]

C

explanation : use the formula , cp = 100 – discount + brokerage % cp = 100 - 4 + 1 / 5 96.2 thus the cp is rs 96.2 . answer : c

openbookqa

obqa_02_03200

An electrical conductor is a vehicle for what?

[ "people", "water", "sunlight", "zapping energy" ]

D

An electrical conductor is a vehicle for the flow of electricity

medmcqa

medmcqa_05_04443

Weight of an infant doubles by what age?

[ "6 months", "1 year", "2 years", "3 years" ]

A

Ans. is 'a' i.e., 6 months *Weight of an infant doubles by 5 months and quadruples by 2 years of age.AgeWeightBirth3kg5 months6kg (2 x birth weight)1 years9kg (3 x birth weight)2 years12kg (4 x birth weight)3 years15kg (5 x birth weight)5 years18kg (6 x birth weight)7 years21kg (7 x birth weight)10 years30kg (10 x birth weight)

openbookqa

obqa_02_00899

what makes food cooking possible?

[ "a temperature rise on it", "the washing of it", "the taste of it", "none of these" ]

A

cooking food requires adding heat energy

math_qa

mathqa_03_02413

sandy buys an old scooter for $ 800 and spends $ 200 on its repairs . if sandy sells the scooter for $ 1200 , what is the gain percent ?

[ "15 %", "18 %", "20 %", "22 %" ]

C

selling price / total cost = 1200 / 1000 = 1.2 the gain percent is 20 % . the answer is c .

openbookqa

obqa_02_02596

A car hitting a rolling boulder can cause the car to

[ "increase in value", "wet itself", "play the radio", "decrease momentum" ]

D

a force acting on an object in the opposite direction that the object is moving can cause that object 's speed to decrease in a forward motion

math_qa

mathqa_03_02575

a man buy a book in rs 50 & sale it rs 50 . what is the rate of profit ? ? ?

[ "10 %", "0 %", "30 %", "25 %" ]

B

"cp = 50 sp = 50 profit = 50 - 50 = 0 % = 0 / 50 * 100 = 0 % answer : b"

openbookqa

obqa_02_03567

Which of the following provides the best reason for squirrels vacating their forest?

[ "The forest is overrun with chipmunks", "The forest is being harvested for lumber", "Many acorns can be found on the forest floor", "They want to start a new life" ]

B

if a habitat is removed then that habitat is destroyed

math_qa

mathqa_03_02008

a and b can do a work in 8 days , b and c can do the same work in 12 days . a , b and c together can finish it in 6 days . a and c together will do it in ?

[ "8", "4", "6", "12" ]

A

( a + b + c ) ' s 1 day work = 1 / 6 ; ( a + b ) ' s 1 day work = 1 / 8 ( b + c ) ' s 1 day work = 1 / 12 ( a + c ) ' s 1 day work = ( 2 * 1 / 6 ) - ( 1 / 8 + 1 / 12 ) = ( 1 / 3 - 5 / 24 ) = 1 / 8 so , a and c together will do the work in 8 days . answer a

math_qa

mathqa_03_02775

an empty tank be filled with an inlet pipe ‘ a ’ in 42 minutes . after 12 minutes an outlet pipe ‘ b ’ is opened which can empty the tank in 30 minutes . after 6 minutes another inlet pipe ‘ c ’ opened into the same tank , which can fill the tank in 35 minutes and the tank is filled . find the time taken to fill the tank ?

[ "51.6", "51.5", "51.7", "51.1" ]

B

assume total tank capacity = 210 liters now capacity of pipe a = 210 / 42 = 5 liters capacity of b = 210 / 30 = - 7 liters capacity of c = 210 / 35 = 6 min assume tank gets filled in x min after the third pipe got opened . so x × 5 + 6 × ( − 2 ) + 4 x = 210 x × 5 + 6 × ( − 2 ) + 4 x = 210 ⇒ 48 + 4 x = 210 ⇒ 4 x = 162 ⇒ x = 40.5 ⇒ 48 + 4 x = 210 ⇒ 4 x = 162 ⇒ x = 40.5 total time taken to fill the tank = 40.5 + 12 + 6 = 51.5 answer : b

medmcqa

medmcqa_05_00261

Warfarin embryopathy is due to action of:

[ "Osteophysin", "Osteotensin", "Osteocalcin", "Osteogenin" ]

C

Ans: (c) OsteocalcinRef: style="font-size: 1.04761904761905em; font-family: Times New Roman, Times, serif; margin: 0 0 0 4px">Warfarin embryopathyThe process of osteocalcin carboxylation in human bone formation is a vitamin K-dependent process and that circulating osteocalcin will be altered structurally by warfarin administrationThis finding has pathophysiological implications for: o Fetal warfarin embryopathy syndromeBone disease associated with chronic liver diseasesOsteoporosisIn all the above conditions vitamin K deficiency has been implicated Note:The similarity between fetal warfarin syndrome and X-linked recessive chondroplasia puntata has suggested a common pathogenesis for these two disorders. Warfarin appears to inhibit arylsulfatase, a genetically determined deficiency which is responsible for chondroplasia puntata.

sciq

sciq_01_01058

What type of change has occurred when a copper penny changes color?

[ "chemical change", "reactive change", "contamination change", "carbon change" ]

A

Some of these pennies are shiny and copper colored. That’s how pennies look when they are new. The older pennies are dull and brown. Copper at the surface of these pennies has combined with air to become a different substance with different properties. The change in color shows that a chemical change has occurred.

openbookqa

obqa_02_02974

When the amount of food goes down, the amount of conflict between the organisms searching for it will

[ "nothing.", "remain the same", "go down", "go up" ]

D

as the population of prey decreases , competition between predators will increase

math_qa

mathqa_03_00829

if 6 a = 7 b = 20 , then 84 ab =

[ "50", "100", "625", "800" ]

D

"6 a * 7 b = 20 * 20 = 400 42 ab = 400 i . e . 84 ab = 800 answer : option d"

sciq

sciq_01_01815

What type of ionic compound is formed from acid and bases reacting with each other?

[ "isolated", "common", "dry", "salt" ]

D

Acids have some properties in common. They turn litmus, a plant extract, red. They react with some metals to give off H2 gas. They react with carbonate and hydrogen carbonate salts to give off CO2 gas. Acids that are ingested typically have a sour, sharp taste. (The name acid comes from the Latin word acidus, meaning “sour. ”) Bases also have some properties in common. They are slippery to the touch, turn litmus blue, and have a bitter flavor if ingested. Acids and bases have another property: they react with each other to make water and an ionic compound called a salt. A salt, in chemistry, is any ionic compound made by combining an acid with a base. A reaction between an acid and a base is called a neutralization reaction and can be represented as follows: acid + base → H2O + salt The stoichiometry of the balanced chemical equation depends on the number of H+ions in the acid and the number of OH− ions in the base.

medmcqa

medmcqa_05_04337

Drug of choice for bacterial vaginosis: March 2011

[ "Ciprofloxacin", "Doxycycline", "Teracycline", "Metronidazole" ]

D

Ans. D: Metronidazole The 7-day course of metronidazole 500 mg twice daily is effective in 85% of courses of bacterial/ gardnerella vaginosis, whereas a single dose of 2 gm cures only 45%.

ARC-Easy

arc_04_00800

Salt and pepper are placed together in a container. When the container is shaken, the salt and pepper become a

[ "liquid.", "mixture.", "solution.", "suspension." ]

B

null

math_qa

mathqa_03_01044

4 mat - weavers can weave 4 mats in 4 days . at the same rate , how many mats would be woven by 6 mat - weavers in 6 days ?

[ "25", "9", "39", "61" ]

B

"let the required number of bottles be x . more weavers , more mats ( direct proportion ) more days , more mats ( direct proportion ) wavers 4 : 6 : : 4 : x days 4 : 6 4 * 4 * x = 6 * 6 * 4 x = ( 6 * 6 * 4 ) / ( 4 x 4 ) x = 9 . answer is b ."

sciq

sciq_01_09231

The epochs of the universe are known back to very shortly after what 'explosive' event?

[ "major bang", "Explosive bang", "Biggest bang", "big bang" ]

D

H0 = 20km/s ⋅ Mly. • Explanations of the large-scale characteristics of the universe are intimately tied to particle physics. • The dominance of matter over antimatter and the smoothness of the CMBR are two characteristics that are tied to particle physics. • The epochs of the universe are known back to very shortly after the Big Bang, based on known laws of physics. • The earliest epochs are tied to the unification of forces, with the electroweak epoch being partially understood, the GUT epoch being speculative, and the TOE epoch being highly speculative since it involves an unknown single superforce. • The transition from GUT to electroweak is called spontaneous symmetry breaking. It released energy that caused the inflationary scenario, which in turn explains the smoothness of the CMBR.

sciq

sciq_01_06576

Embryos usually don't survive if they have extra or too few of these genetic units?

[ "chromosomes", "genes", "phenotypes", "ribosomes" ]

A

Outside of chromosome 21 and the sex chromosomes, most embryos with extra chromosomes do not usually survive. Because chromosomes carry many, many genes, a disruption of a chromosome can cause severe problems with the development of a fetus. Individuals with one (or more) fewer chromosome usually don't survive either. Can you explain why?.

sciq

sciq_01_05623

X and y are the labels of what specialized human chromosomes?

[ "protein chromosomes", "carb chromosomes", "exotic chromosomes", "sex chromosomes" ]

D

The 24 human chromosomes. The autosomes are numbered 1 - 22, based on size, with chromosome 1 being the largest. The X and Y sex chromosomes are shown in the box.

sciq

sciq_01_04924

Ocean water releases dissolved carbon dioxide into the atmosphere when what happens to the temperature?

[ "it rises", "Drops", "Later", "Goes Down" ]

A

Ocean water releases dissolved carbon dioxide into the atmosphere when water temperature rises.

sciq

sciq_01_10861

What is the first and longest phase of mitosis known as?

[ "metaphase", "prophase", "anaphase", "telophase" ]

B

Prophase is the first and longest phase of mitosis, see Figure below . During prophase, the chromatin (DNA) coils up into visible chromosomes, each made up of two sister chromatids held together by the centromere. Also during this phase, the nucleolus disappears, and the spindle begins to form from the centrioles. Most eukaryotic cells contain structures known as centrosomes, consisting of a pair of centrioles. During prophase, the centrioles begin to move to opposite ends, or poles, of the cell. As the centrioles migrate, the fiber-like spindle begins to elongate between the centrioles. The spindle is a thin, cage-like structure made out of microtubules. In plant cells, the spindle forms without centrioles. The spindle plays an essential role moving chromosomes and in the separation of sister chromatids.

openbookqa

obqa_02_01770

Adults that go through incomplete metamorphosis may have

[ "love", "feelings", "horns", "attached flying contraptions" ]

D

incomplete metamorphosis is when an insect reaches the adult stage without being a pupa

openbookqa

obqa_02_02335

A hurricane over and near water will be strong, and as it travels further from the sea it

[ "explodes", "expands", "dies down", "grows" ]

C

when a hurricane moves over land , that hurricane will decrease in strength

sciq

sciq_01_02499

What occurs as a result of the discharge of static electricity?

[ "clouds", "drought", "lightning", "thunder" ]

C

Zachary Wilson. Lightning is the result of the discharge of static electricity . CC BY-NC 3.0.

medmcqa

medmcqa_05_04815

External hemorrhoids below the dentate line are:

[ "Painful", "Ligation is done as management", "Skin tag is not seen in these cases", "May turn malignant" ]

A

Ans. a. Painful (Ref: Sabiston 19/e p1387-1391; Schwartz 9/e p1057-1059; Bailey 26/e p1250-1257, 25/e p1253-1259; Schackelford 7/e p1896-1906)External hemorrhoids are located below dentate line and are painful.External Hemorrhoids:Located distal to dentate lineQAlso known as 5-days painful self curing lesionPainful, not ligatedQExcision is doneQRepeated thrombosis leads to semi-ripe black current appearanceHemorrhoidRecent theories regard hemorrhoids as normal anatomical structuresQ.These are cushions of submucosal tissue containing venules, arterioles, smooth muscle fibres and elastic connective tissue.Three hemorrhoidal cushions are found in the left lateral, right anterior and right posterior position (3, 7 and 11 O' Clock)QHemorrhoids or piles are symptomatic anal cushionsMore common when intra-abdominal pressure is raised, e.g. in obesity, constipation and pregnancySymptoms: bright-red, painless bleeding, mucus discharge and prolapseHemorrhoids cannot be palpated, best diagnosed by proctoscopyQ.Internal HemorrhoidsExternal Hemorrhoids* Located proximal to the dentate lineQ* Painless, can be ligatedQ* Banding is preferredQ* Located distal to dentate lineQ* Also known as 5-days painful self curing lesion* Painful, not ligatedQ* Excision is doneQ* Repeated thrombosis leads to semi-ripe black current appearanceQ Classification of Internal hemorrhoids1st degreePainless bleedingQ, no prolapse2nd degreeProlapse through the anus, on straining but reduce spontaneouslyQ3rd degreeProlapse through the anal canal and require manual reductionQ4th degreePermanently prolapsed and cannot be manually reduced.QTreatment:Mere presence of hemorrhoids is not necessarily an indication of treatment.Treatment is only indicated if they are symptomatic. Best treatment is the least invasive one which is possible to alleviate the symptomsQ.Treatment of hemorrhoidsMedical therapy* Bleeding from 1st and 2nd degree hemorrhoids often improve with the addition of dietary fibre, stool softeners and other diet regulationQ.Rubber band ligation* Done for 1st, 2nd and selected 3rd degree hemorrhoidsQInfrared Photocoagulation* Done for 1st and 2nd degree hemorrhoidsSclerotherapy* Done for 1+, 2nd and selected 3rd degree hemorrhoidsQ* Most commonly used sclerosant is 5% phenol in almond or arachis oil.OperativehemorrhoidectomyQ* 3rd and 4th degree hemorrhoidQ* 2nd degree not cured by non-operative methodsQ* Mixed (combine internal/external hemorrhoids)Q* Fibrosed hemorrhoidsOperative HemorrhoidectomyMilligan-Morgan open hemorrhoidectomyQFerguson closed hemorrhoidectomyQWhitefield submucosal hemorrhoidectomyQLonga's stapler hemorrhoidectomyQ

math_qa

mathqa_03_00276

a grocer has a sale of rs . 6435 , rs . 6927 , rs . 6855 , rs . 7230 and rs . 6562 for 5 consecutive months . how much sale must he have in the sixth month so that he gets an average sale of rs . 6700 ?

[ "s . 4991", "s . 5991", "s . 6001", "s . 6191" ]

D

"total fr 5 mnths = ( 6435 + 6927 + 6855 + 7230 + 6562 ) = rs 34009 . reqd . sale = rs . [ ( 6700 * 6 ) - 34009 ] = rs . ( 40200 - 34009 ) = rs . 6191 . answer : d"

openbookqa

obqa_02_02957

Before their trip to the Amazon Bill and Jane had sharp metal objects stuck into their arms by a doctor.

[ "they were getting ice water injected so they would stay cool in the Amazon", "they wanted to avoid contracting something", "aliens performed experiments on them", "they wanted to catch the flu" ]

B

vaccines can help prevent illness

sciq

sciq_01_08944

What's the term for a relationship between two organisms where at least one benefits?

[ "symbiosis", "meiosis", "morphogenesis", "dermatitis" ]

A

Symbiosis is a close relationship between organisms of different species in which at least one of the organisms benefits. The other organism may also benefit, or it may be unaffected or harmed by the relationship. Figure below shows an example of symbiosis. The birds in the picture are able to pick out food from the fur of the deer. The deer won't eat the birds. In fact, the deer knowingly lets the birds rest on it. What, if anything, do you think the deer gets out of the relationship?.

math_qa

mathqa_03_04839

if the cost price is 25 % of selling price . then what is the profit percent .

[ "150 %", "200 %", "300 %", "350 %" ]

C

"explanation : let the s . p = 100 then c . p . = 25 profit = 75 profit % = ( 75 / 25 ) * 100 = 300 % . answer : c"

openbookqa

obqa_02_04624

This likely relies on a circuit being closed

[ "your iPhone charger", "your hair brush", "your hat", "your shoes" ]

A

when a switch in a simple series circuit is closed , electricity will flow through the circuit

math_qa

mathqa_03_00967

how many positive integers less than 248 are multiple of 4 but not multiples of 6 ?

[ "20", "41", "42", "53" ]

B

"244 / 4 = 61 multiples of 4 which are a multiple of 6 will be of the form 2 * 2 * 3 = 12 n where n > 0 240 / 12 = 20 61 - 20 = 41 answer : b"

openbookqa

obqa_02_02691

Which would feel hotter?

[ "a stove on the fingertips", "a stove on the butt", "a fridge on the butt", "a fridge on the fingertips" ]

A

if an object is hot then the surfaces of that object are hot

math_qa

mathqa_03_04130

if n is a positive integer and the product of all the integers from 1 to n , inclusive , is a multiple of 9 , what is the least possible value of n ?

[ "7", "6", "9", "12" ]

B

we need at least 2 factors of three , which means n must be at least 6 , so b is the correct answer .

math_qa

mathqa_03_04158

what is the least number . which should be added to 221 to make it a perfect square ?

[ "5", "8", "4", "6" ]

C

"221 + 4 = 225 15 ^ 2 answer : c"

sciq

sciq_01_06090

The scale that is used to measure the loudness of sound measures their loudness in what?

[ "decibels", "centimeters", "waves", "weight" ]

A

The most common cause of hearing loss is exposure to loud sounds. Loud sounds can damage hair cells inside the ears. Hair cells change sound waves to electrical signals that the brain can interpret as sounds. Louder sounds, which have greater intensity than softer sounds, can damage hair cells more quickly than softer sounds. You can see the relationship between sound intensity, exposure time, and hearing loss in the following Figure below . The intensity of sounds is measured in decibels (dB).

openbookqa

obqa_02_04228

If a person wants to watch the eclipse

[ "it's best to go without sunglasses", "it's best to use a telescope", "it's best to just look at it", "it's best to use eye protection" ]

D

a solar eclipse could only happen during the new moon

sciq

sciq_01_00333

What is the outer layer of an axon that acts like a layer of insulation, similar to the plastic that encases an electrical cord?

[ "nerve sheath", "lipids sheath", "myelin sheath", "layer sheath" ]

C

The axon of many neurons has an outer layer called a myelin sheath (see Figure above ). Myelin is a lipid produced by a type of a glial cell known as a Schwann cell. The myelin sheath acts like a layer of insulation, similar to the plastic that encases an electrical cord. Regularly spaced nodes, or gaps, in the myelin sheath allow nerve impulses to skip along the axon very rapidly.

sciq

sciq_01_08374

Transverse divisions are associated with leaf elongation, and longitudinal divisions are associated with what?

[ "leaf shedding", "leaf broadening", "leaf multiplying", "leaf coloring" ]

B

ARC-Easy

arc_04_00941

Which action involving a pulley system requires the least amount of force?

[ "using several pulleys together instead of a single pulley", "using a fixed pulley instead of a moveable pulley", "pulling a long rope instead of a short rope", "pulling a rope up instead of down" ]

A

null

math_qa

mathqa_03_03338

a can do a work in 9 days and b can do the same work in 18 days . if they work together , in how many days will they complete the work ?

[ "6 days", "7 days", "5 days", "3 days" ]

A

one day ' s work of a and b = 1 / 9 + 1 / 8 = ( 2 + 1 ) / 18 = 1 / 6 so , the time taken to complete the work is 6 days . answer : a

sciq

sciq_01_04783

Sudden changes in geologic and climatic conditions can spur what process?

[ "cloning", "generation", "evolution", "symbiosis" ]

C

When geologic and climatic conditions are changing, evolution may occur more quickly. Thus, long periods of little change may be interrupted by bursts of rapid change. This model of the timing of evolution is called punctuated equilibrium . It is better supported by the fossil record than is gradualism. This model suggests that niches left open by sudden geologic and climatic changes may be rapidly filled by bursts of evolution.

sciq

sciq_01_07819

What is the only marsupial in north america?

[ "Raccoon", "oppossum", "Didelphinae", "Marmosa" ]

B

Most people think of opossums as scary creatures. Is this because they look kind of funny, walk kind of funny, have beady eyes and sharp teeth, and can emit a very foul odor? Maybe. But what is so different about opossums is that they are the only marsupial in North America.

sciq

sciq_01_04137

What kind of bonds, where electrons are transferred rather than shared, are considered the ultimate in polarity?

[ "ionic bonds", "soluble bonds", "magnetic bonds", "covalent bonds" ]

A

polar, while others are strongly polar. Ionic bonds can be considered the ultimate in polarity, with electrons being transferred rather than shared. To judge the relative polarity of a covalent bond, chemists use electronegativity, which is a relative measure of how strongly an atom attracts electrons when it forms a covalent bond. There are various numerical scales for rating electronegativity. Figure 4.4 "Electronegativities of Various Elements" shows one of the most popular—the Pauling scale. The polarity of a covalent bond can be judged by determining the difference in the electronegativities of the two atoms making the bond. The greater the difference in electronegativities, the greater the imbalance of electron sharing in the bond. Although there are no hard and fast rules, the general rule is if the difference in electronegativities is less than about 0.4, the bond is considered nonpolar; if the difference is greater than 0.4, the bond is considered polar. If the difference in electronegativities is large enough (generally greater than about 1.8), the resulting compound is considered ionic rather than covalent. An electronegativity difference of zero, of course, indicates a nonpolar covalent bond.

openbookqa

obqa_02_04047

Where is a mama bear likely to find food?

[ "on top of the highest trees", "in the deepest mines", "in the inside of a felled oak", "at the bottom of the lake" ]

C

bears eat insects

sciq

sciq_01_03606

Coal, oil and natural gas are types of what formed from the remains of once living organisms?

[ "fossil compounds", "living fossils", "crop fuels", "fossil fuels" ]

D

Coal, oil and natural gas are all fossil fuels formed from the remains of once living organisms.

math_qa

mathqa_03_04119

solution a is 20 % sugar and solution b is 80 % sugar . if you have 30 ounces of solution a and 60 ounces of solution b , in what ratio could you mix solution a with solution b to produce 50 ounces of a 50 % sugar solution ?

[ "6 : 4", "6 : 14", "4 : 4", "4 : 6" ]

C

forget the volumes for the time being . you have to mix 20 % and 80 % solutions to get 50 % . this is very straight forward since 50 is int he middle of 20 and 80 so we need both solutions in equal quantities . if this does n ' t strike , use w 1 / w 2 = ( a 2 - aavg ) / ( aavg - a 1 ) w 1 / w 2 = ( 80 - 50 ) / ( 50 - 20 ) = 1 / 1 so the volume of the two solutions will be equal . answer has to be 4 : 4 = c

sciq

sciq_01_00675

Humans are unique in their ability to alter their environment with the conscious purpose of increasing what, which acts as a limiting factor on populations in general?

[ "density dependent limitation", "carrying capacity", "containing capacity", "niche" ]

B

Overcoming Density-Dependent Regulation Humans are unique in their ability to alter their environment with the conscious purpose of increasing its carrying capacity. This ability is a major factor responsible for human population growth and a way of overcoming density-dependent growth regulation. Much of this ability is related to human intelligence, society, and communication. Humans can construct shelter to protect them from the elements and have developed agriculture and domesticated animals to increase their food supplies. In addition, humans use language to communicate this technology to new generations, allowing them to improve upon previous accomplishments. Other factors in human population growth are migration and public health. Humans originated in Africa, but have since migrated to nearly all inhabitable land on the Earth. Public health, sanitation, and the use of antibiotics and vaccines have decreased the ability of infectious disease to limit human population growth. In the past, diseases such as the bubonic plaque of the fourteenth century killed between 30 and 60 percent of Europe’s population and reduced the overall world population by as many as 100 million people. Today, the threat of infectious disease, while not gone, is certainly less severe. According to the World Health Organization, global death from infectious disease declined from 16.4 million in 1993 to 14.7 million in 1992. To compare to some of the epidemics of the past, the percentage of the world's population killed between 1993 and 2002 decreased from 0.30 percent of the world's population to 0.24 percent. Thus, it appears that the influence of infectious disease on human population growth is becoming less significant.

sciq

sciq_01_05952

The strong affinity of concentrated sulfuric acid for water makes it a good agent of what?

[ "hydrating", "diluting", "concentrating", "dehydrating" ]

D

The strong affinity of concentrated sulfuric acid for water makes it a good dehydrating agent. It is possible to dry gases and immiscible liquids that do not react with the acid by passing them through the acid. Sulfuric acid is a strong diprotic acid that ionizes in two stages. In aqueous solution, the first stage is essentially complete. The secondary ionization is not nearly so complete, and HSO 4 − is a moderately strong acid (about 25% ionized in solution of a HSO 4 − salt: Ka = 1.2 × 10−2). Being a diprotic acid, sulfuric acid forms both sulfates, such as Na2SO4, and hydrogen sulfates, such as NaHSO4. Most sulfates are soluble in water; however, the sulfates of barium, strontium, calcium, and lead are only slightly soluble in water. Among the important sulfates are Na2SO4⋅10H2O and Epsom salts, MgSO4⋅7H2O. Because the HSO 4 − ion is an acid, hydrogen sulfates, such as NaHSO4, exhibit acidic behavior, and this compound is the primary ingredient in some household cleansers. Hot, concentrated sulfuric acid is an oxidizing agent. Depending on its concentration, the temperature, and the strength of the reducing agent, sulfuric acid oxidizes many compounds and, in the process, undergoes reduction to SO2, HSO 3 −, SO 3 2−, S, H2S, or S2−. Sulfur dioxide dissolves in water to form a solution of sulfurous acid, as expected for the oxide of a nonmetal. Sulfurous acid is unstable, and it is not possible to isolate anhydrous H2SO3. Heating a solution of sulfurous acid expels the sulfur dioxide. Like other diprotic acids, sulfurous acid ionizes in two steps: The hydrogen sulfite ion, HSO 3 −, and the sulfite ion, SO 3 2−, form. Sulfurous acid is a moderately strong acid. Ionization is about 25% in the first stage, but it is much less in the second (Ka1 = 1.2 × 10−2 and Ka2 = 6.2 × 10−8). In order to prepare solid sulfite and hydrogen sulfite salts, it is necessary to add a stoichiometric amount of a base to a sulfurous acid solution and then evaporate the water. These salts also form from the reaction of SO2 with oxides and hydroxides. Heating solid sodium hydrogen sulfite forms sodium sulfite, sulfur dioxide, and water: Δ.

sciq

sciq_01_03375

What topographic feature does a circle with inward hatches represent on a contour map?

[ "vegetation", "a lake", "a depression", "a mountain" ]

C

On a contour map, a circle with inward hatches indicates a depression.

math_qa

mathqa_03_00885

what is the sum of the multiples of 4 from 40 to 80 , inclusive ?

[ "560", "660", "800", "760" ]

B

"the formula we want to use in this type of problem is this : average * total numbers = sum first , find the average by taking the sum of the f + l number and divide it by 2 : a = ( f + l ) / 2 second , find the total numbers in our range by dividing our f and l numbers by 4 and add 1 . ( 80 / 4 ) - ( 40 / 4 ) + 1 multiply these together so what we show average * total numbers = sum ( 80 + 40 ) / 2 * ( 80 / 4 ) - ( 40 / 4 ) + 1 = sum 60 * 11 = 660 b"

medmcqa

medmcqa_05_00455

During appendectomy if it is noticed that base of appendix is inflammed then fuher line of treatment is

[ "No appendicectomy", "No burrying of stump", "Hemicolectomy", "Cecal resection" ]

B

Ans. is 'b' i.e. No burrying of stump

math_qa

mathqa_03_04752

find the area of trapezium whose parallel sides are 28 cm and 20 cm long , and the distance between them is 21 cm ?

[ "288 cm 2", "277 cm 2", "504 cm 2", "510 cm 2" ]

C

"area of a trapezium = 1 / 2 ( sum of parallel sides ) * ( perpendicular distance between them ) = 1 / 2 ( 28 + 20 ) * ( 21 ) = 504 cm 2 answer : c"

sciq

sciq_01_00437

What vesicles store neurotransmitters?

[ "Golgi apparatus", "dendritic", "hydrophobic", "synaptic" ]

D

Secretory Vesicles contain materials that are to be excreted from the cell, such as wastes or hormones . Secretory vesicles include synaptic vesicles and vesicles in endocrine tissues. Synaptic vesicles store neurotransmitters. They are located at presynaptic terminals in neurons. When a signal reaches the end of an axon, the synaptic vesicles fuse with the cell membrane and release the neurotransmitter. The neurotransmitter crosses the synaptic junction, and binds to a receptor on the next cell. Some cells also produce molecules, such as hormones produced by endocrine tissues, needed by other cells. These molecules are stored in secretory vesicles and released when needed. Secretory vesicles also hold enzymes needed to make extracellular structures, such as the extracellular matrix of animal cells.

sciq

sciq_01_00491

Gases such as co2 and methane can trap what energy in earth's atmosphere, before radiating it into space?

[ "potential energy", "sunlight energy", "mechanical energy", "thermal energy" ]

D

Thermal energy can be trapped in Earth’s atmosphere by gases such as CO2, water vapor, methane, and chlorofluorocarbons before it can be radiated into space—like the effect of a greenhouse. It is not yet clear how large an increase in the temperature of Earth’s surface can be attributed to this phenomenon. Venus is an example of a planet that has a runaway greenhouse effect. The atmosphere of Venus is about 95 times denser than that of Earth and contains about 95% CO2. Because Venus is closer to the sun, it also receives more solar radiation than Earth does. The result of increased solar radiation and high CO2 levels is an average surface temperature of about 450°C, which is hot enough to melt lead. Data such as those in Figure 5.22 "Changes in Atmospheric CO" indicate that atmospheric levels of greenhouse gases have increased dramatically over the past 100 years, and it seems clear that the heavy use of fossil fuels by industry is largely responsible. It is not clear, however, how large an increase in temperature (global warming) may result from a continued increase in the levels of these gases. Estimates of the effects of doubling the preindustrial levels of CO2 range from a 0°C to a 4.5°C increase in the average temperature of Earth’s surface, which is currently about.

openbookqa

obqa_02_02159

The body of creatures may have nutrients delivered to various areas based on where

[ "hair grows", "nails are trimmed", "vessels travel", "birds exist" ]

C

arteries transport nutrients throughout the body

sciq

sciq_01_02189

Which kind of irrigation uses much less water than other methods?

[ "solar", "drip", "constant", "mist" ]

B

Drip irrigation uses much less water than other methods.

sciq

sciq_01_04802

What is the name for a kind of animal that eats a mix of plant and animal foods.

[ "an smorgasbord", "an omnivore", "an herbivore", "a carnivore" ]

B

Some mammals are omnivores. Omnivores are heterotrophs that eat a mix of plant and animal foods. Mammals that are omnivores include bears, foxes, rats, pigs, and human beings. The chimpanzees in Figure below are also omnivorous mammals. In the wild, they eat mainly plant foods, but they supplement plants with birds, bird eggs, insects, small monkeys, and other small mammals. Their favorite and most common food, however, is fruit. Animals that eat mainly fruit are called frugivores.

sciq

sciq_01_05668

Producing sperm and secreting testosterone are the main functions of what system?

[ "pollination", "male reproductive system", "female reproductive system", "endocrine system" ]

B

The main functions of the male reproductive system are to produce sperm and secrete testosterone.

ARC-Easy

arc_04_00477

What chemical symbol represents the element iron?

[ "Fe", "I", "Ir", "Pb" ]

A

null

sciq

sciq_01_09864

What kind of lakes form when volcanic eruptions create holes that fill with water?

[ "novel lakes", "crater lakes", "formation lakes", "artificial lakes" ]

B

Other lakes are crater lakes or rift lakes ( Figure below ). Crater lakes form when volcanic eruptions create craters that fill with water. Rift lakes form when movements of tectonic plates create low places that fill with water.