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7.76k
sciq
sciq_01_04739
How long can a large star be on the main sequence stage?
[ "200.4 million years", "10 million years", "60.11 million years", "3 million years" ]
B
Large stars burn through their supply of hydrogen very quickly. These stars “live fast and die young!” A very large star may only be on the main sequence for 10 million years. A very small star could remain on the main sequence for tens to hundreds of billions of years—far longer than the current age of our Universe.
medmcqa
medmcqa_05_04561
Which amongst the following is the indication for parenteral iron therapy?
[ "Compliant patient", "Intolerance to oral iron", "When an immediate rise of Hb is required such as a patient in labour", "To decrease the duration of oral medication" ]
B
Indications of parenteral iron therapy: 1. Oral therapy is contraindicated 2. Patient is non compliant to take oral iron 3. Non-tolerance to oral iron 3. Malabsorption Syndrome. 4. Moderate anemia in third trimester NOTE: the rate of increase of Hb is almost same as that with oral iron therpy. Therefore in any conditio...
medmcqa
medmcqa_05_04999
Pressure of normal uterine contractions is between 190-300 units. Which unit is being referred to here?
[ "Montevideo units", "mm of Hg", "cm of water", "Joules/kg" ]
A
Ans. is a, i.e. Montevideo unitsRef Williams Obs, 23/e, p 4371 montevideo unit = Intensity of constraction x number of contractions in 10 mins.Montevideo unit is to define uterine activity.As per this:Clinical labour usually commences when uterine activity reaches values between 80-120 Montevideo units (This translates...
medmcqa
medmcqa_05_04118
Squamous cell carcinoma is characterized by _________ edges
[ "Undermined", "Pearly & rolled", "Indurated & everted", "Punched out" ]
C
SCC is characterized by indurated & everted edges BCC is characterized by pearly rounded edges.
medmcqa
medmcqa_05_04232
The enzyme responsible for development of Cataract in diabetes is due to
[ "Hexokinase", "NADPH+ dependent aldoreductase", "Glucokinase", "Phosphofructoisomerase" ]
B
NADPH+ dependent aldoreductase is responsible for accumulation of Sorbitol in Lens causing Cataract in Diabetic.
sciq
sciq_01_10457
What is formed when an acidic solution and a basic solution react together in a neutralization reaction?
[ "salt", "shallow", "Sodium", "seawater" ]
A
An acidic solution and a basic solution react together in a neutralization reaction that also forms a salt.
openbookqa
obqa_02_04771
A creature that is lacking domestication, and is also lacking a wild space, perhaps occupies
[ "a wild time", "a distant planet", "a small crater", "a displayed habitat" ]
D
some animals live in zoo exhibits
math_qa
mathqa_03_03876
during the first week of performances of a certain play , 5400 tickets were sold , all at reduced price . during the remaining weeks of performances , 5 times as many tickets were sold at full price as were sold at reduced price . if the total number of tickets e sold was 25200 , how many of them were sold at full pric...
[ "21000", "19800", "16500", "15800" ]
C
given : the question tells us about the number of tickets sold in the first week at reduced price = 5400 . it also tells us that during the remaining weeks , the number of tickets sold at full price was 5 times the no . of tickets sold at reduced price . the total tickets sold was 25200 , and we are asked to find the n...
openbookqa
obqa_02_03965
More sunlight will be absorbed by
[ "a plant with curled leaves", "a tree with wide, smooth leaves", "a rose with tiny leaves", "a berry bush with thin, short leaves" ]
B
if something is outside during the day then that something will receive sunlight
math_qa
mathqa_03_03746
in a group of 100 people , 60 like volleyball , 50 like hockey . how many like both volleyball and hockey ?
[ "20", "15", "10", "5" ]
C
"make a venn diagram , and enter your data . let the number of people who like both volleyball and hockey be x 60 - x + x + 50 - x = 100 x = 10 so number who like both volleyball and hockey = 10 answer c"
medmcqa
medmcqa_05_03485
According to PCPNDT Act, 1994, punishment for doctor if found guilty for sex determination: NEET 15
[ "1 year", "2 years", "3 years", "5 years" ]
C
Ans. 3 years
sciq
sciq_01_11559
What energy source, now making a comeback, has helped propel ships and pump water for many years?
[ "solar energy", "wind energy", "geothermal energy", "weather energy" ]
B
The whirring blades of these wind turbines look stark against the darkening sky at sunset. The energy of the wind causes the blades to spin, and the energy of the spinning blades is used to generate electricity. People have been using wind for energy for centuries. Until about 200 years ago, for example, ships depended...
sciq
sciq_01_06938
What natural part of the water cycle can cause damage and death?
[ "clouds", "floods", "evaporation", "expiration" ]
B
Floods are a natural part of the water cycle, but they can cause a lot of damage. Farms and homes may be lost, and people may die. In 1939, millions of people died in a flood in China. Although freshwater is needed to grow crops and just to live, too much freshwater in the same place at once can be deadly.
sciq
sciq_01_05294
What do organisms use to store energy?
[ "proteins", "tissues", "lipids", "metabolytes" ]
C
A lipid is an organic compound such as fat or oil. Organisms use lipids to store energy, but lipids have other important roles as well. Lipids consist of repeating units called fatty acids. Fatty acids are organic compounds that have the general formula CH 3 (CH 2 ) n COOH, where n usually ranges from 2 to 28 and is al...
math_qa
mathqa_03_01441
on a saturday night , each of the rooms at a certain motel was rented for either $ 40 or $ 60 . if 10 of the rooms that were rented for $ 60 had instead been rented for $ 40 , then the total rent the motel charged for that night would have been reduced by 20 percent . what was the total rent the motel actually charged ...
[ "$ 600", "$ 800", "$ 1,000", "$ 1,600" ]
C
"let total rent the motel charge for all rooms = x if 10 rooms that were rented for 60 $ had instead been rented for 40 $ , then total difference in prices = 20 $ * 10 = 200 $ total rent the motel charged would have been reduced by 20 % . 2 x = 200 = > x = 1000 answer c"
math_qa
mathqa_03_01290
a can do a work in 15 days and b in 20 days . if they work on it together then in how many days required to complete the work ?
[ "300 / 31", "300 / 35", "300 / 21", "300 / 15" ]
B
person ( a ) ( b ) ( a + b ) time - ( 15 ) ( 20 ) ( 300 / 35 ) rate - ( 20 ) ( 15 ) ( 35 ) work - ( 300 ) ( 300 ) ( 300 ) therefore a + b requires ( 300 / 35 ) days to complete entire work = 300 / 35 answer is b
sciq
sciq_01_11354
What can sodium ions not pass through?
[ "narrowness lipid bilayer", "benthic lipid bilayer", "Lipid Control", "nonpolar lipid bilayer" ]
D
As an example, even though sodium ions (Na+) are highly concentrated outside of cells, these electrolytes are charged and cannot pass through the nonpolar lipid bilayer of the membrane. Their diffusion is facilitated by membrane proteins that form sodium channels (or “pores”), so that Na+ ions can move down their conce...
sciq
sciq_01_09885
What are hot fragments of rock called?
[ "pyroclasts", "magma", "obsidian", "shards" ]
A
Ash and particles shoot many kilometers into the sky. The material may form a mushroom cloud, just like a nuclear explosion. Hot fragments of rock, called pyroclasts , fly up into the air at very high speeds. The pyroclasts cool in the atmosphere. Some ash may stay in the atmosphere for years. The ash may block out sun...
openbookqa
obqa_02_03896
A decomposer might thrive more on
[ "Magic", "Jupiter", "Time Traveling", "Old turkey" ]
D
dead organisms are the source of nutrients for decomposers
openbookqa
obqa_02_01643
A metal sticker remains on a fridge because of
[ "vibrations in the surface of the fridge door", "a force that pulls two objects together", "magic that Juggaloes are unable to explain", "the entropy of the universe" ]
B
magnetic attraction pulls two objects together
medmcqa
medmcqa_05_00757
The most strongly implicated premalignant condition of the oral cavity is -
[ "Fordyce spots", "Erythroplakia", "Median rhomboid glositis", "Erythema multiforme" ]
B
Erythroplakia is analogous to the term leukoplakia which describes white patches. Together, these are the 2 traditionally accepted types of premalignant lesion in the mouth,When a lesion contains both red and white areas, the term "speckled leukoplakia" or "eyhroleukoplakia" is used. Although oral erythroplakia is much...
openbookqa
obqa_02_00620
If the mass of an object increases, what must the volume do for the density to stay the same?
[ "increase", "decrease", "stay the same", "become zero" ]
A
density is a measure of mass over volume
math_qa
mathqa_03_01502
of the diplomats who attended a summit conference : 20 spoke french , 32 did not speak hindi and 20 % of the diplomats spoke neither french nor hindi . if 10 % of the diplomats spoke both french and hindi , then how many diplomats attended the conference ?
[ "70", "96", "108", "120" ]
D
"2 x 2 matrix will be the easiest way to calculate this . text in black : given statements text in red : calculated values thus d = 120 is the correct answer"
math_qa
mathqa_03_02262
the average weight of 8 persons increases by 1.5 kg . if a person weighing 65 kg is replaced by a new person , what could be the weight of the new person ?
[ "76 kg", "77 kg", "76.5 kg", "data inadequate" ]
B
"total weight increases = 8 × 1.5 = 12 kg so the weight of new person = 65 + 12 = 77 kg answer b"
sciq
sciq_01_05418
Tropical rainforests are an example of a climate that occurs near what?
[ "equator", "tundras", "deserts", "poles" ]
A
Tropical wet climates occur at or very near the Equator. They have high rainfall year round. Tropical rainforests ( FIgure below ) grow in this type of climate.
openbookqa
obqa_02_02707
In an experiment, chemical splashing can happen so
[ "be dangerous", "be safe", "be messy", "be playful" ]
B
chemical splashing sometimes occurs during experiments
sciq
sciq_01_10915
Some soil water can flow through easily. what kind of soil is this?
[ "dense", "porous", "Stationary", "permeable" ]
D
Water can flow easily through a permeable soil. Spaces between the inorganic particles are large and well connected. Sandy or silty soils are permeable, water-draining types of soils.
ARC-Challenge
arc_04_02342
What is the composition of Saturn's rings?
[ "hydrogen and helium", "ammonia and methane", "clusters of space debris", "chunks of ice and rock" ]
D
null
medmcqa
medmcqa_05_04651
What is the best method for confirming amyloidosis :-
[ "Colonoscopy", "Sigmoidoscopy", "Rectal biopsy", "Tongue biopsy" ]
C
Answer is C (Rectal biopsy): Rectal biopsy is single best answer amongst the options provided. The systemic amyloidosis offer a choice of biopsy sites. Abdominal fat aspirates or renal or rectal biopsies are often preferred'. - Harrison
openbookqa
obqa_02_02905
All things which are alive will require this at some point or at many points during its existence:
[ "coats", "droplets", "sand", "bugs" ]
B
living things require water for survival
math_qa
mathqa_03_03601
a shopkeeper sold an article offering a discount of 5 % and earned a profit of 21.6 % . what would have been the percentage of profit earned if no discount was offered ?
[ "60 %", "28 %", "30 %", "56 %" ]
B
"let c . p . be rs . 100 . then , s . p . = rs . 121.60 let marked price be rs . x . then , 95 / 100 x = 121.60 x = 12160 / 95 = rs . 128 now , s . p . = rs . 128 , c . p . = rs . 100 profit % = 28 % . answer : b"
math_qa
mathqa_03_04482
a retailer bought a machine at a wholesale price of $ 90 and later on sold it after a 10 % discount of the retail price . if the retailer made a profit equivalent to 20 % of the whole price , what is the retail price q of the machine ?
[ "81", "100", "120", "135" ]
C
"since the wholesale price was $ 90 and the profit was 20 % of the wholesale price ( [ . 2 ] [ 90 ] = $ 18 ) , the retail price would have to be above $ 108 , but not that much greater than that . let ' s start by testing answer c : $ 120 . . . . if . . . . . retail price q = $ 120 10 % discount off = $ 120 - ( . 1 ) (...
medmcqa
medmcqa_05_01350
Bisected pearls appearance on culture medium is seen in -
[ "Brucella", "Bordetella", "Haemophilus ducreyi", "Pseudomonas" ]
B
Ans. is 'b' i.e., Bordetella * Bordetella are gram-negative, capsulated, fimbriated, nonmotile coccobacillus.* They show bipolar metachromatic granules on staining with toluidine blue.* They are strict aerobes.* They are biologically inactive (non-fermenters).* There catalase and oxidase are positive.* There are two im...
math_qa
mathqa_03_00361
how many cubes of 4 cm edge can be put in a cubical box of 1 m edge .
[ "17725 cm", "15625 cm", "12786 cm", "12617 cm" ]
B
"number of cubes = 100 â ˆ — 100 â ˆ — 100 / 4 * 4 * 4 = 15625 note : 1 m = 100 cm answer : b"
medmcqa
medmcqa_05_01274
A 40 year old women presented with a CT scan of head showing an enlarged sellatursica. Neurological and endocrine work up in detail were found to be normal. The most likely diagnosis is-
[ "Prolactinoma", "Chromophobe adenoma", "Craniophobe", "Empty sella syndrome" ]
D
in empty Sella syndrome , patient usually have normal pituitary function , implying that surrounding rim of pituitary tissue is fully functional ( Harrison 17 pg 2199)
math_qa
mathqa_03_04035
the unit digit in the product ( 891 * 781 * 912 * 463 ) is :
[ "2", "5", "6", "8" ]
C
"explanation : unit digit in the given product = unit digit in ( 1 * 1 * 2 * 3 ) = 6 answer : c"
medmcqa
medmcqa_05_04565
which of the floowing is a side effect of SNRI
[ "premature ejaculation", "delayed orgasm", "cancer", "hypotension" ]
B
SNRI * IMPOANCE Dual antidepressant like TCA but better than TCA has it has no dryness of mouth, hypotension, sedation * MECHANISM Inhibits the reuptake of both serotonin and dopamine * DRUGS VENLEFEXINE DESVENLEFEXINE DULOXETINE * USE Duloxetine===PAIN ASSOSIATED WITH DIABTIC NEUROPATHY and STRESS URINARY INCONTINENCE...
math_qa
mathqa_03_01170
kiran has 85 currency notes in all , some of which were of rs . 100 denomination and the remaining of rs . 50 denomination . the total amount of all these currency notes was rs . 5000 . how much amount did she have in the denomination of rs . 50 ? a . b . c . none of these d . answer : option b explanation :
[ "1900", "3500", "4000", "2000" ]
B
let the number of 50 – rupee notes be x . then , the number of 100 - rupee notes = ( 85 – x ) 50 x + 100 ( 85 – x ) = 5000 x + 2 ( 85 – x ) = 100 = x = 70 so , required amount = rs . ( 50 x 70 ) = rs . 3500 answer : b
sciq
sciq_01_03060
Not surprisingly, what is the function of the most developed part of a bird's brain?
[ "controlling flight", "controlling digestion", "controlling breeding", "controlling thought" ]
A
Birds have a large brain relative to the size of their body. Not surprisingly, the part of the brain that controls flight is the most developed part. The large brain size of birds is also reflected by their high level of intelligence and complex behavior. In fact, birds such as crows and ravens may be more intelligent ...
ARC-Easy
arc_04_01901
A female dog is having puppies. She has black fur, brown eyes, and a curly tail. She can sit, bark, and roll over on command. Which set of traits can the female dog's puppies inherit?
[ "brown eyes, black fur", "fur, roll over on command", "brown eyes, sit on command", "bark on command, curly tail" ]
A
null
sciq
sciq_01_10559
What term is used to describe birds that hunt, eat mammals, and other birds?
[ "warriors", "consumers", "raptors", "predators" ]
C
Raptors such as hawks and owls are carnivores. They hunt and eat mammals and other birds. Vultures are scavengers. They eat the remains of dead animals, such as roadkill. Aquatic birds generally eat fish or water plants. Perching birds may eat insects, fruit, honey, or nectar. Many fruit-eating birds play a key role in...
ARC-Easy
arc_04_01049
Bones support the body. What pulls and pushes on bones to move them?
[ "blood", "nerves", "muscles", "skin" ]
C
null
sciq
sciq_01_00124
A few earthquakes take place away from plate boundaries, these are called what?
[ "outer earthquakes", "intraplate earthquakes", "distant earthquakes", "deformation earthquakes" ]
B
The remaining 5% are scattered around other plate boundaries. A few earthquakes take place away from plate boundaries. These are intraplate earthquakes.
openbookqa
obqa_02_01147
There are nutrients in dirt, like magnesium, and those nutrients may be
[ "poisoned", "collected into vegetation", "set on fire", "taught to read" ]
B
if some nutrients are in the soil then those nutrients are in the food chain
sciq
sciq_01_03858
Where is the guinea worm a serious problem?
[ "ukraine", "florida", "africa", "russia" ]
C
Guinea worm is a serious problem in parts of Africa that is being eradicated. Learn what is being done to decrease the number of people suffering from this parasite at the video below:.
openbookqa
obqa_02_04942
Which likely causes the most waste?
[ "a twinkie factory", "sustainable fisheries", "solar panels", "a wind farm" ]
A
processes sometimes produce waste products
sciq
sciq_01_09418
Which germ layers are essential for animal embryos to grow and develop into a body?
[ "cytoplasm and chloroplasm", "histone and melatonin", "keratinocytes , ectoderm , mesoderm", "endoderm, ectoderm, mesoderm" ]
D
The three germ layers are the endoderm, the ectoderm, and the mesoderm. Cells in each germ layer differentiate into tissues and embryonic organs. The ectoderm gives rise to the nervous system and the epidermis, among other tissues. The mesoderm gives rise to the muscle cells and connective tissue in the body. The endod...
sciq
sciq_01_11312
The ambrosia beetle bores holes in?
[ "tree bark", "leaves", "dirt", "flowers" ]
A
Ambrosia beetles bore holes in tree bark and “plant” fungal spores in the holes. The holes in the bark give the fungi an ideal place to grow. The beetles harvest fungi from their “garden. ”.
sciq
sciq_01_05335
When do cells acquire different identities in an ordered spatial arrangement?
[ "before morphogenesis", "during morphogenesis", "larval stage", "during mitosis" ]
B
math_qa
mathqa_03_01918
company s produces two kinds of stereos : basic and deluxe . of the stereos produced by company s last month , 2 / 3 were basic and the rest were deluxe . if it takes 1.3 as many hours to produce a deluxe stereo as it does to produce a basic stereo , then the number of hours it took to produce the deluxe stereos last m...
[ "7 / 17", "13 / 33", "7 / 15", "17 / 35" ]
B
"the easiest way for me is to plug in numbers . let the number of basic stereos produced be 40 , and number of delux stereos produced be 20 . total of 60 stereos . if it takes an hour to produce a basic stereo then it will take 1.3 hours to produce a deluxe stereo . 40 basic stereos = 40 hours . 20 delux stereos = 26 h...
ARC-Easy
arc_04_01284
When a hammer strikes a nail, the nail
[ "exerts balanced forces that helps it from moving.", "exerts a force equal to the weight of the hammer.", "exerts an unbalanced force that changes its velocity.", "exerts an equal and opposite force back on the hammer." ]
D
null
openbookqa
obqa_02_03523
plant stem is the vehicle for transporting water and food from roots to the rest of the
[ "solar harnessing life", "cupcake", "rock", "sneaker" ]
A
a plant stem is the vehicle for transporting water and food from roots to the rest of the plant
math_qa
mathqa_03_03561
a thief goes away with a santro car at a speed of 40 kmph . the theft has been discovered after half an hour and the owner sets off in a bike at 50 kmph when will the owner over take the thief from the start ?
[ "22 hours", "21 hours", "23 hours", "20 hours" ]
D
"d 20 hours | - - - - - - - - - - - 20 - - - - - - - - - - - - - - - - - - - - | 50 40 d = 20 rs = 50 – 40 = 10 t = 20 / 10 = 2 hours"
ARC-Easy
arc_04_01686
Which event would most likely cause a rapid extinction of organisms?
[ "a large asteroid impact", "regional drought", "new glacier formation", "a decrease in the growth of weeds" ]
A
null
sciq
sciq_01_06649
What is the amount of energy required to begin a chemical reaction known as?
[ "reaction energy", "activation energy", "positive energy", "decomposition energy" ]
B
All chemical reactions need energy to get started. Even reactions that release energy need a boost of energy in order to begin. The energy needed to start a chemical reaction is called activation energy . Activation energy is like the push a child needs to start going down a playground slide. The push gives the child e...
openbookqa
obqa_02_00862
What is most like a mirror?
[ "grasslands", "deserts", "oceans", "forests" ]
C
a mirror is used for reflecting light
medmcqa
medmcqa_05_01425
Causative toxin for endemic ascites is
[ "Ergot", "Aflatoxin", "Pyrrolizidine", "Beta-oxylamino-alanine" ]
C
It was noticed in the Kusmi block of Sarguja district of Madhya Pradesh during the years 1973 and 1976. There was an outbreak of rapidly progressing ascites and jaundice among the tribals. Moality rate was 40%. Investigation by the National Institute of Nutrition concluded that this outbreak was due to intake of Millet...
sciq
sciq_01_03669
Shark teeth likely evolved from the jagged scales that cover their skin, called what?
[ "pinworm scales", "heterotroph scales", "placoid scales", "hook scales" ]
C
Chondrichthyes: Cartilaginous Fishes The clade Chondrichthyes is diverse, consisting of sharks (Figure 29.11), rays, and skates, together with sawfishes and a few dozen species of fishes called chimaeras, or “ghost” sharks. ” Chondrichthyes are jawed fishes that possess paired fins and a skeleton made of cartilage. Thi...
sciq
sciq_01_02569
How does a cell's membrane keep extracellular materials from mixing with it's internal components?
[ "absorbs extracellular materials", "repels extracellular materials", "provides a barrier", "destroys extracellular materials" ]
C
CHAPTER REVIEW 3.1 The Cell Membrane The cell membrane provides a barrier around the cell, separating its internal components from the extracellular environment. It is composed of a phospholipid bilayer, with hydrophobic internal lipid “tails” and hydrophilic external phosphate “heads. ” Various membrane proteins are s...
openbookqa
obqa_02_00193
When a lake is exposed to enough heat over time
[ "animals leave", "it ceases existing", "plants dry up", "fish grow ill" ]
B
if a body of water loses all water then that body of water does not exist any more
math_qa
mathqa_03_04245
8.008 / 1.001
[ "0.008", "8", "0.8", "80" ]
B
"answer is 8 , move the decimal forward three places for both numerator and denominator or just multiply both by a thousand . the result is 8008 / 1001 = 8 answer b"
sciq
sciq_01_08988
Shrimp are an example of what group within the arthropods?
[ "insect", "myriapods", "crustaceans", "scorpion" ]
C
Shrimp are an example of crustaceans, one group within the arthropods. Shrimp live on the ocean floor in many parts of the world. Shrimp are not only food for humans; they are also an important food source for larger marine animals.
medmcqa
medmcqa_05_01505
The most common retrobulbar mass in adults is
[ "Neurofibroma", "Meningioma", "Cavernous hemangioma", "Schwannoma" ]
C
Cavernous hemangioma is a non encapsulated seen most commonly inside the muscle cone. Refer khurana 6/e p 411
openbookqa
obqa_02_04146
After a storm
[ "drinking water will be in short supply", "ponds may dry out", "creek beds may be spilling over", "flowers will wilt and wither" ]
C
as dryness increases in an environment , the available water in that environment will decrease
math_qa
mathqa_03_04823
what is the largest 4 digit number exactly divisible by 88
[ "9900", "9999", "9988", "9944" ]
D
"explanation : largest 4 digit number is 9999 after doing 9999 ÷ 88 we get remainder 55 hence largest 4 digit number exactly divisible by 88 = 9999 - 55 = 9944 answer : option d"
sciq
sciq_01_09822
What is the name of the process that refers to the balance or equilibrium within the cell or a body?
[ "hypothesis", "determinants", "static", "homeostasis" ]
D
Homeostasis refers to the balance, or equilibrium within the cell or a body. It is an organism’s ability to keep a constant internal environment. Keeping a stable internal environment requires constant adjustments as conditions change inside and outside the cell. The adjusting of systems within a cell is called homeost...
sciq
sciq_01_02855
Fertilized mollusk eggs develop into what?
[ "larvae", "shrimp", "bark", "leaf" ]
A
Mollusks reproduce sexually. Most species have separate male and female sexes. Fertilization may be internal or external, depending on the species. Fertilized eggs develop into larvae. There may be one or more larval stages. Each one is different from the adult stage.
openbookqa
obqa_02_02597
If I was blind I could use my hands to tell what
[ "the color of Susie's eyes", "the color of the sky", "the color of Bob's hair", "the shape of Tom's nose" ]
D
the shape of an object can be discovered through feeling that object
sciq
sciq_01_09438
Unlike pure substances, mixtures have a what?
[ "variable composition", "unique composition", "complex composition", "efficient composition" ]
A
When two or more pure substances are combined together, a mixture is formed. Unlike pure substances, mixtures have a variable composition. Variable composition indicates that the relative proportions of the mixtures components may vary, and they can be separated by physical methods. There are two main types of mixtures...
ARC-Challenge
arc_04_02263
Which of the following will reduce a home electric bill?
[ "using cloth napkins rather than paper towels", "drying clothes on a clothesline on sunny days", "keeping appliances plugged in when not in use", "using incandescent light bulbs in the lamps" ]
B
null
openbookqa
obqa_02_04162
A person who is working on setting up power for their cottage will avoid
[ "installing new power outlets", "working on their wiring", "installing electrical wires in walls", "standing in a puddle" ]
D
water is an electrical conductor
math_qa
mathqa_03_02979
if n is an integer , f ( n ) = f ( n - 1 ) - n and f ( 4 ) = 15 . what is the value of f ( 6 ) ?
[ "4", "0", "1", "2" ]
A
since f ( n ) = f ( n - 1 ) - n then : f ( 6 ) = f ( 5 ) - 6 and f ( 5 ) = f ( 4 ) - 5 . as given that f ( 4 ) = 15 then f ( 5 ) = 15 - 5 = 10 - - > substitute the value of f ( 5 ) back into the first equation : f ( 6 ) = f ( 5 ) - 6 = 10 - 6 = 4 . answer : a . questions on funtions to practice :
math_qa
mathqa_03_03875
two goods trains each 500 m long are running in opposite directions on parallel tracks . their speeds are 70 km / hr and 30 km / hr respectively . find the time taken by the slower train to pass the driver of the faster one ?
[ "22", "36", "48", "99" ]
B
"relative speed = 70 + 30 = 100 km / hr . 100 * 5 / 18 = 250 / 9 m / sec . distance covered = 500 + 500 = 1000 m . required time = 1000 * 9 / 250 = 36 sec answer : b"
math_qa
mathqa_03_01871
a rectangular photograph is surrounded by a border that is 1 inch wide on each side . the total area of the photograph and the border is m square inches . if the border had been 6 inches wide on each side , the total area would have been ( m + 200 ) square inches . what is the perimeter of the photograph , in inches ?
[ "8", "12", "16", "20" ]
B
"let x and y be the width and length of the photograph . ( x + 2 ) ( y + 2 ) = m and so ( 1 ) xy + 2 x + 2 y + 4 = m ( x + 12 ) ( y + 12 ) = m and so ( 2 ) xy + 12 x + 12 y + 144 = m + 200 let ' s subtract equation ( 1 ) from equation ( 2 ) . 10 x + 10 y + 140 = 200 2 x + 2 y = 12 , which is the perimeter of the photog...
math_qa
mathqa_03_03979
the area of a triangle is with base 3 m and height 10 m ?
[ "88 m 2", "10 m 2", "66 m 2", "15 m 2" ]
C
"1 / 2 * 3 * 5 = 15 m 2 answer : c"
sciq
sciq_01_04400
What is the term for a mutually beneficial relationship in which one organism lives inside the other?
[ "endosymbiosis", "symbiosis", "parasite", "parthenogenesis" ]
A
Endosymbiosis We have mentioned that both mitochondria and chloroplasts contain DNA and ribosomes. Have you wondered why? Strong evidence points to endosymbiosis as the explanation. Symbiosis is a relationship in which organisms from two separate species depend on each other for their survival. Endosymbiosis (endo- = “...
sciq
sciq_01_00045
Hard igneous rocks and easily dissolved sedimentary rocks respond very differently to what natural force?
[ "evaporation", "gravity", "weathering", "sunlight" ]
C
Each type of rock weathers in its own way. Certain types of rock are very resistant to weathering. Igneous rocks tend to weather slowly because they are hard. Water cannot easily penetrate them. Granite is a very stable igneous rock. Other types of rock are easily weathered because they dissolve easily in weak acids. L...
math_qa
mathqa_03_00051
for any integer m greater than 1 , $ m denotes the product of all the integers from 1 to m , inclusive . how many prime numbers are there between $ 7 + 2 and $ 7 + 10 , inclusive ?
[ "none", "one", "two", "three" ]
A
$ is basically a factorial of a number . so , we are asked to find the number of primes between 7 ! + 2 and 7 ! + 10 , inclusive . from each number 7 ! + k were 2 ≤ k ≤ 102 ≤ k ≤ 10 we can factor out k , thus there are no pries in the given range . for example : 7 ! + 2 = 2 ( 3 * 4 * 5 * 6 * 7 + 1 ) - - > a multiple of...
sciq
sciq_01_04383
What is group 16 of the periodic table referred to?
[ "dioxide group", "oxygen group", "sulfur group", "acid group" ]
B
Group 16 of the periodic table is also called the oxygen group. The first three elements—oxygen (O), sulfur (S), and selenium (Se)—are nonmetals. They are followed by tellurium (Te) ( Figure below ), a metalloid, and polonium (Po), a metal. All group 16 elements have six valence electrons and are very reactive. Oxygen ...
sciq
sciq_01_03755
Which common type of diabetes is also known as noninsulin-dependent or adult-onset diabetes?
[ "gestational diabetes", "type 1", "type 2", "juvenile diabetes" ]
C
inner aspect of the atlas, where it is held in place by a ligament. Rotation at this joint allows you to turn your head from side to side. A second pivot joint is found at the proximal radioulnar joint. Here, the head of the radius is largely encircled by a ligament that holds it in place as it articulates with the rad...
math_qa
mathqa_03_03661
a farmer with 1,350 acres of land had planted his fields with corn , sugar cane , and tobacco in the ratio of 5 : 2 : 2 , respectively , but he wanted to make more money , so he shifted the ratio to 2 : 4 : 3 , respectively . how many more acres of land were planted with tobacco under the new system ?
[ "90", "150", "270", "300" ]
B
"originally ( 2 / 9 ) * 1350 = 300 acres were planted with tobacco . in the new system ( 3 / 9 ) * 1350 = 450 acres were planted with tobacco . the answer is b ."
medmcqa
medmcqa_05_03899
The lymphatic drainage to central pa of the lip is
[ "Submandibular node", "Submental nodes", "Deep cervical nodes", "Jugulodiagastric nodes" ]
B
Submental lymph nodes: these are three or four nodes situated across the midline below the chin in the submental triangle. Lymphatics of the central pa of the lower lip drain to the submental nodes,the lymphatics from the rest of the lower lip pass to the submandibular nodes. REF.BDC VOL.3,FIFTH EDITION
openbookqa
obqa_02_03103
If a bass is returned to its home, it is placed in
[ "a brook", "a field", "a jungle", "a coven" ]
A
a fish lives in water
math_qa
mathqa_03_04163
how many of the positive divisors q of 120 are also multiples of 4 not including 120 ?
[ "3 .", "4 .", "5 .", "7 ." ]
D
"4 , 8,12 , 20,24 , 40,60 . ( 7 ) is the answer other way : factors of 120 = 2 ^ 3 * 3 * 5 separate 2 ^ 2 ( which means 4 ) now , calculate the number of other factors . q = 2 * 3 * 5 = total positive factors are 2 * 2 * 2 = 8 this 8 factors include 120 so subtract 1 from 8 ans is 7 = d"
math_qa
mathqa_03_02424
an association of mathematics teachers has 1,260 members . only 640 of these members cast votes in the election for president of the association . what percent of the total membership voted for the winning candidate if the winning candidate received 60 percent of the votes cast ?
[ "30.47 %", "58 %", "42 %", "34 %" ]
A
"total number of members = 1260 number of members that cast votes = 640 since , winning candidate received 60 percent of the votes cast number of votes for winning candidate = ( 60 / 100 ) * 640 = 384 percent of total membership that voted for winning candidate = ( 384 / 1260 ) * 100 = 30.47 % answer a"
sciq
sciq_01_09174
What is the standard unit for mass?
[ "kilogram", "ounce", "meter", "pound" ]
A
The standard unit for mass is the kilogram . The kilogram's standard is a block of platinum-iridium metal kept near Paris, France. Other countries, of course, keep copies. A kilogram is denoted "kg" and is a multiple of the smaller unit of mass, the gram ("g").
math_qa
mathqa_03_01269
a boat can travel with a speed of 13 km / hr in still water . if the speed of the stream is 4 km / hr , find the time taken by the boat to go 68 km downstream .
[ "2", "4", "6", "5" ]
B
"speed downstream = ( 13 + 4 ) km / hr = 17 km / hr . time taken to travel 68 km downstream = 68 / 17 = 4 hrs ans - b"
ARC-Challenge
arc_04_02269
Which question can most likely be determined through a scientific investigation?
[ "Who will be the winner of the next lottery?", "What football team will win the next game?", "What is the amount of light needed to grow tomatoes?", "Which four types of bird feathers have the prettiest colors?" ]
C
null
sciq
sciq_01_05292
What type of disturbance do even dominant plants depend on in many biomes?
[ "radiation", "seismic force", "mass extinction", "periodic" ]
D
openbookqa
obqa_02_04575
Which likely most relies on its looks to reproduce?
[ "the shark", "the horse", "the spider", "the peacock" ]
D
coloration is used to find a mate by some animals
medmcqa
medmcqa_05_03025
Climbing fibres of cerebellar cortex are -
[ "Olivocerebellar fibres", "Spinocerebellar fibres", "Pontocerebellar fibres", "Vestibulocerebellar fibers" ]
A
Ans. is 'a' i.e., Olivocerebellar fibers o Input (afferent) cerebellum comes from two fibers.Climbing fibers (olivocerebellar fibers) bring information from inferior olivary nuclei only.Mossy fibers bring information from all other parts of the body.
sciq
sciq_01_02507
What is the process of making an observation in terms of a numerical scale and recording the value?
[ "respiration", "ambient", "graduation", "measurement" ]
D
Measurement is the process of making an observation in terms of a numerical scale and recording the value.
sciq
sciq_01_10178
Name the two types of water turtles live in.
[ "ocean water and fresh water", "river water and lake water", "arctic water and ice water", "ocean water and sea water" ]
A
Many turtles are aquatic. They may live in the ocean or in fresh water. Other turtles are terrestrial and live on land. All lizards are terrestrial. Their habitats may range from deserts to rainforests. They may live in a range of places, from underground burrows to the tops of trees. Most snakes are terrestrial, but s...
openbookqa
obqa_02_00534
Three hundred and sixty five turns of the earth is
[ "double half a calendar year", "a very long time", "almost half of a lifetime", "more than two years" ]
A
one year is equal to 365 days
math_qa
mathqa_03_01405
a train speeds past a pole in 15 sec and a platform 100 m long in 25 sec , its length is ?
[ "158 m", "150 m", "110 m", "130 m" ]
B
"let the length of the train be x m and its speed be y m / sec . then , x / y = 15 = > y = x / 15 ( x + 100 ) / 25 = x / 15 = > x = 150 m . answer : b"
sciq
sciq_01_09778
In which supergroup are red algae and green algae included?
[ "archaeplastida", "xerophyte", "troglodyte", "spirogyra" ]
A
Archaeplastida Red algae and green algae are included in the supergroup Archaeplastida. It was from a common ancestor of these protists that the land plants evolved, since their closest relatives are found in this group. Molecular evidence supports that all Archaeplastida are descendents of an endosymbiotic relationshi...
openbookqa
obqa_02_00660
A way to keep a cup of coffee warm is to
[ "cook it in the oven", "heat it with a torch", "put it in the sun", "use a heated plate" ]
D
a hot plate is a source of heat
math_qa
mathqa_03_02711
if 0.5 % of a = 75 paise , then the value of a is ?
[ "rs . 150", "rs . 17", "rs . 1.70", "rs . 4.25" ]
A
"answer ∵ 0.5 / 100 of a = 75 / 100 ∴ a = rs . ( 75 / 0.5 ) = rs . 150 correct option : a"
ARC-Easy
arc_04_01078
Newly made proteins are modified in which organelle?
[ "ribosome", "endoplasmic reticulum", "mitochondrion", "nuclear envelop" ]
B
null
math_qa
mathqa_03_02300
a car was driving at 50 km / h for 30 minutes , and then at 90 km / h for another 40 minutes . what was its average speed ?
[ "102", "80", "75", "70" ]
A
"driving at 50 km / h for 30 minutes , distance covered = 50 * 1 / 2 = 25 km driving at 90 km / h for 40 minutes , distance covered = 90 * 2 / 3 = 60 km average speed = total distance / total time = 85 / 5 / 6 = 102 km / h answer : a"