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ARC-Easy
arc_04_01357
The length of daylight changes as the seasons change during the year. What causes these changes in daylight?
[ "Earth's tilt on its axis", "the Sun's tilt on its axis", "Earth spinning on its axis", "the Sun spinning on its axis" ]
A
null
sciq
sciq_01_11203
What is the cause of behavioral difference between populations?
[ "genetic differences", "environmental factors", "electromagnetic differences", "genetic wavelengths" ]
A
sciq
sciq_01_01228
Diffusion can occur across a semipermeable membrane, such as the cell membrane, as long as a what exists?
[ "concentration gradient", "differential", "parity", "polarity" ]
A
Diffusion can occur across a semipermeable membrane, such as the cell membrane, as long as a concentration gradient exists. Molecules will continue to flow in this manner until equilibrium is reached. At equilibrium, there is no longer an area of high concentration or low concentration, and molecules flow equally in bo...
medmcqa
medmcqa_05_04438
Root value of common peroneal nerve -
[ "S1S2S3", "L1L2L3", "L4L5S1S2", "S3-S5" ]
C
Ans. is 'c' i.e., L4L5S1S2 NerveRoot valveo Siatic nervey Tibial nervey Common peroneal nerveL-4,5 S1,2,3L-4.5 S1,2,3L-4,5 S1,2o Superior gluteal nerveL-4,5 S1o Inferior gluteal nerveL5S1,2o Nerve to quadratus femorisL-4,5 S1o Nerve to obturatus intemusL5S1,2o Superior gemellusL-4,5S1o Infeior gemellusL4,5 S1,2o Poster...
sciq
sciq_01_06397
Where do radio waves lie on the electromagnetic spectrum?
[ "top", "far left", "far right", "middle" ]
B
Courtesy of NASA. Radio waves lie at the far left of the electromagnetic spectrum . Public Domain.
math_qa
mathqa_03_04923
two brothers ram and ravi appeared for an exam . the probability of selection of ram is 3 / 7 and that of ravi is 1 / 5 . find the probability that both of them are selected .
[ "3 / 35", "2 / 3", "7 / 35", "5 / 7" ]
A
"let a be the event that ram is selected and b is the event that ravi is selected . p ( a ) = 3 / 7 p ( b ) = 1 / 5 let c be the event that both are selected . p ( c ) = p ( a ) x p ( b ) as a and b are independent events : = 3 / 7 x 1 / 5 = 3 / 35 answer : a"
openbookqa
obqa_02_04019
Which is most characterized by the vibration of air?
[ "a viola", "a brick", "a blood cell", "a flashlight" ]
A
matter vibrating can cause sound
medmcqa
medmcqa_05_00679
The afferent pathway for light pupillary reflex is:
[ "Trigeminal nerve", "Optic nerve", "Abducent nerve", "Ciliary nerve" ]
B
B i.e. Optic nerve
sciq
sciq_01_04584
Cell walls, plastids, and a large central vacuole distinguish plant cells from what?
[ "eukaryotic cells", "parenchyma cells", "animal cells", "phloem cells" ]
C
30.1 | The Plant Body By the end of this section, you will be able to: • Describe the shoot organ system and the root organ system • Distinguish between meristematic tissue and permanent tissue • Identify and describe the three regions where plant growth occurs • Summarize the roles of dermal tissue, vascular tissue, a...
openbookqa
obqa_02_00894
A radiator is something that can
[ "recycle water from the toilet", "propel a rocket to the moon", "keep a room comfortable", "filter water from the tap" ]
C
a radiator is a source of heat
sciq
sciq_01_05844
What does the urea cycle process?
[ "nitrogen", "calcium", "oxygen", "urine" ]
A
Freely available amino acids are used to create proteins. If amino acids exist in excess, the body has no capacity or mechanism for their storage; thus, they are converted into glucose or ketones, or they are decomposed. Amino acid decomposition results in hydrocarbons and nitrogenous waste. However, high concentration...
medmcqa
medmcqa_05_00859
What accumulates in tissues in hemochromatosis?
[ "Iron", "Copper", "Ceruloplasmin", "Lipofuschhin" ]
A
Ans. is 'a' i.e., Iron Hemochromatosis is characterized by the excessive accumulation of body iron, most of which is deposited in parenchymal organs such as liver and pancreas. Hemochromatosis is a disorder of iron metabolism. Characterized by a triad of :- Micronodular cirrhosis Diabetes mellitus Skin pigmentation Org...
sciq
sciq_01_10062
What kind of variation does a rate measure?
[ "property to time", "construction to time", "value to time", "environment to time" ]
A
A rate is a measure of how some property varies with time. Speed is a familiar rate that expresses the distance traveled by an object in a given amount of time. Wage is a rate that represents the amount of money earned by a person working for a given amount of time. Likewise, the rate of a chemical reaction is a measur...
math_qa
mathqa_03_04810
think of a number , divide it by 6 and add 5 to it . the result is 17 . what is the number thought of ?
[ "24", "72", "297", "267" ]
B
"explanation : 17 - 5 = 12 12 x 6 = 72 answer : b"
sciq
sciq_01_08710
What gland is located in the neck, where it wraps around the trachea?
[ "thyroid gland", "salivary gland", "adrenal gland", "pituitary gland" ]
A
Figure 17.12 Thyroid Gland The thyroid gland is located in the neck where it wraps around the trachea. (a) Anterior view of the thyroid gland. (b) Posterior view of the thyroid gland. (c) The glandular tissue is composed primarily of thyroid follicles. The larger parafollicular cells often appear within the matrix of f...
ARC-Challenge
arc_04_02141
Which of the following statements best explains why magnets usually stick to a refrigerator door?
[ "The refrigerator door is smooth.", "The refrigerator door contains iron.", "The refrigerator door is a good conductor.", "The refrigerator door has electric wires in it." ]
B
null
sciq
sciq_01_02443
How did lamarck believe species change over time?
[ "became larger", "inheritance of acquired characteristics", "lose of acquired traits", "ecological of acquired characteristics" ]
B
Jean Baptiste Lamarck (1744–1829) was an important French naturalist. He was one of the first scientists to propose that species change over time. However, Lamarck was wrong about how species change. His idea of the inheritance of acquired characteristics is incorrect. Traits an organism develops during its own life ti...
sciq
sciq_01_05583
What are the female gametes that form in the ovaries?
[ "eggs", "genes", "sperm", "spermatozoa" ]
A
Eggs are female gametes that form in the ovaries and are released into the fallopian tubes.
openbookqa
obqa_02_02779
During photosynthesis, plants produce sugar that may help with their what?
[ "Babies", "Love Handles", "Belly", "sustenance" ]
D
sugars are transported from the leaves to the roots of a plant
sciq
sciq_01_02843
Because opposite charges attract, oppositely charged ions attract each other to form what?
[ "soluble bonds", "ionic bonds", "particle bonds", "nuclear bonds" ]
B
until all atoms have octets. Because some atoms will lose electrons and some atoms will gain electrons, there is no overall change in the number of electrons, but individual atoms acquire a nonzero electric charge. Those that lose electrons become positively charged, and those that gain electrons become negatively char...
sciq
sciq_01_08617
Aside from light, incandescent light bulbs also give off what that wastes energy?
[ "heat", "humidity", "electricity", "temperature" ]
A
The classroom in Figure above has artificial light sources in addition to natural sunlight. There are fluorescent lights on the ceiling of the room. There are also projectors on the ceiling that are shining light on screens. In these and most other artificial light sources, electricity provides the energy and some type...
sciq
sciq_01_03765
Boyle’s law applies to matter which is in what state?
[ "liquids", "plasma", "solids", "gas" ]
D
A piston having a certain pressure and volume (left piston) will have half the volume when its pressure is twice as much (right piston). One can also plot P versus V for a given amount of gas at a certain temperature; such a plot will look like the graph on the right. Boyle’s law is an example of a second type of mathe...
math_qa
mathqa_03_03264
a boat goes 100 km downstream in 10 hours , and 75 m upstream in 15 hours . the speed of the stream is ?
[ "22 1 / 9 kmph", "22 8 / 2 kmph", "22 1 / 8 kmph", "22 1 / 2 kmph" ]
D
100 - - - 10 ds = 10 ? - - - - 1 75 - - - - 15 us = 5 ? - - - - - 1 s = ( 10 - 5 ) / 2 = 2 21 / 2 kmph answer : d
openbookqa
obqa_02_03289
If a lake is fully drained and evaporated, then the lake will
[ "be full", "be gone", "be moist", "be wet" ]
B
if a body of water loses all water then that body of water does not exist any more
sciq
sciq_01_01178
What are the special mating behaviors in birds called?
[ "presentation", "courtship", "display", "attraction" ]
B
Birds reproduce sexually and have separates sexes. Fertilization occurs internally, so males and females must mate. Many bird species have special behaviors, such as unique songs or visual displays, for attracting mates. These special behaviors are called courtship. The white peacock in Figure below is putting on a stu...
sciq
sciq_01_06131
The spinal cord develops, cells making up the wall of the neural tube proliferate and differentiate into what?
[ "jelly and glia", "membrane and glia", "neurons and glia", "muscles and glia" ]
C
Spinal Cord Development While the brain is developing from the anterior neural tube, the spinal cord is developing from the posterior neural tube. However, its structure does not differ from the basic layout of the neural tube. It is a long, straight cord with a small, hollow space down the center. The neural tube is d...
sciq
sciq_01_04663
What fibres are seen in some vertebrates that twitch at rates far faster than any human muscle?
[ "fast oxidative fibres", "slow twitch fibres", "skeletal muscle fibers", "fast glycolytic fibres" ]
C
sciq
sciq_01_11362
Structural adaptations in flying animals often contribute to reduced what?
[ "eyesight", "blood flow", "body mass", "respiration" ]
C
openbookqa
obqa_02_00462
John's pet frog was sick because it wasn't staying warm enough. Maybe
[ "The frog was getting burned by a heat lamp", "the frog was unable to regulate its body temperature without an external heat source", "The frog was using too much ice in its drinks", "The water in the tank had dried up." ]
B
an amphibian is cold-blooded
sciq
sciq_01_08403
Management programs based on population-regulating factors have helped prevent the extinction of many?
[ "abundant species", "keystone species", "omnivores", "endangered species" ]
D
medmcqa
medmcqa_05_03230
Graves disease is an example of which of the following immunologic processes?
[ "Autoimmune disease associated with HLA gene B27", "Autoimmune disease associated with HLA gene DR3", "Immune deficiency associated with HLA gene DR2", "Immune deficiency associated with HLA gene DR4" ]
B
Ans. (b)Graves disease is an autoimmune disease that is associated with the presence of the HLA DR3 gene. It is not associated with HLA B 27, DR2, DR4 or Cw6. It does not result from immunodeficiency.
openbookqa
obqa_02_02793
one's ability to hear their name being called across the room indicates the presence of
[ "gas in the stove", "water in the walls", "atmosphere in the space", "water in the ears" ]
C
sound can travel through air
openbookqa
obqa_02_01004
Decomposition results in the production of which element?
[ "Silicon", "Phosphorus", "Carbon", "Hydrogen" ]
C
decomposition increases amount of organic matter in soil
sciq
sciq_01_03792
Which enzyme is used in step three of the polymerase chain reaction because of it's ability to withstand high temperatures?
[ "carbon polumerase", "taq polymerase", "backronym polymerase", "minocycline polymerase" ]
B
When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance. The symbol "Δ" is often used to indicate that the reaction is to be heated.
sciq
sciq_01_04780
Glucagon and insulin are produced in what organ?
[ "hypothalamus", "thymus", "thyroid", "pancreas" ]
D
math_qa
mathqa_03_02377
if y is 40 % greater than x , than x is what % less than y ?
[ "24.4 %", "28.6 %", "32.3 %", "36.5 %" ]
B
"y = 1.4 x x = y / 1.4 = 10 y / 14 = 5 y / 7 x is 2 / 7 less which is 28.6 % less than y . the answer is b ."
ARC-Easy
arc_04_01768
Lemon juice turns litmus paper red, is corrosive and tastes sour. Lemon juice is classified as
[ "an acid.", "a base.", "an element.", "More information is needed to classify lemon juice." ]
A
null
sciq
sciq_01_04910
What is cholera?
[ "glucose", "protein", "energy", "bacteria" ]
D
Unsafe drinking water causes 88% of diseases worldwide. In many nations, these diseases are the leading cause of death in children under the age of five. More than 14,000 people die every day from such diseases. Cholera is caused by bacteria. A person gets guinea worm from drinking the guinea worm larvae ( Figure below...
sciq
sciq_01_07944
What stimulates the production of milk by the mammary glands following childbirth?
[ "prolactin", "melanin", "progesterone", "estrogen" ]
A
(PRL) in females. Prolactin stimulates the production of milk by the mammary glands following childbirth. Prolactin levels are regulated by the hypothalamic hormones prolactin-releasing hormone (PRH) and prolactin-inhibiting hormone (PIH) which is now known to be dopamine. PRH stimulates the release of prolactin and PI...
sciq
sciq_01_09425
An object with more mass has greater thermal energy than an object with less mass because it has more what?
[ "molecules", "atoms", "ions", "gravity" ]
B
5. Thermal energy is the energy of moving atoms of matter. All matter has thermal energy because atoms of all matter are constantly moving. An object with more mass has greater thermal energy than an object with less mass because it has more atoms.
ARC-Easy
arc_04_02041
In the 1600s, Galileo Galilei studied the moons of Jupiter. What did Galileo do to make better observations?
[ "invented the microscope", "wrote a book about the planets", "created a model of the solar system", "made improvements to the telescope" ]
D
null
sciq
sciq_01_05227
What are the two ways animals can manage their internal environment?
[ "regulating or conforming", "digestion or excretion", "sweating or sleeping", "adaptation or mutation" ]
A
openbookqa
obqa_02_01012
Using a menstrual cup instead of pads or tampons can help avoid
[ "pills", "waste", "blood", "flu" ]
B
An example of avoiding waste is using an object more than once
sciq
sciq_01_01402
Deer ticks are vectors for the bacteria that cause what disease?
[ "Dengue fever", "lyme", "malaria", "mad cow" ]
B
Deer ticks are vectors for the bacteria that cause Lyme disease. The ticks are actually very small and may go unnoticed.
math_qa
mathqa_03_00952
a grocer has a sale of rs . 5921 , rs . 5468 , rs . 5568 , rs . 6088 and rs . 6433 for 5 consecutive months . how much sale must he have in the sixth month so that he gets an average sale of rs . 5900 ?
[ "4902", "4922", "5922", "5924" ]
C
"total sale for 5 months = rs . ( 5921 + 5468 + 5568 + 6088 + 6433 ) = rs . 29478 . required sale = rs . [ ( 5900 x 6 ) - 29478 ] = rs . ( 35400 - 29478 ) = rs . 5922 . answer : c"
sciq
sciq_01_04287
How many valence electrons can be found in a carbon atom?
[ "One", "three", "five", "four" ]
D
Let’s briefly review the basics of covalent bonding as they pertain to carbon. Carbon has four valence electrons, which have a 2s 2 2p 2 configuration in isolated carbon atoms. These four electrons allow carbon to form four covalent bonds, which can mean four single bonds or some combination of single, double, and trip...
math_qa
mathqa_03_02802
how many times will the digit 7 be written when listing the integers from 1 to 1000 ?
[ "110", "111", "271", "300" ]
D
another approach : in the range 0 - 100 : 7 as units digit - 10 times ( 7 , 17 , 27 , . . . , 97 ) ; 7 as tens digit - 10 time ( 71 , 72 , 73 , . . . , 79 ) ; so in first one hundred numbers 7 is written 10 + 10 = 20 times . in 10 hundreds 7 as units or tens digit will be written 10 * 20 = 200 times . plus 100 times wh...
openbookqa
obqa_02_00257
A hawk would prefer this for lunch
[ "Popcorn", "Grass", "Apple", "A bison" ]
D
carnivores only eat animals
medmcqa
medmcqa_05_02406
Setting time of fast setting alginate:
[ "3-4.5 minutes", "1.5-3 minutes", "1-2 minutes", "2.5-3.5 minutes" ]
B
Setting time of Fast-setting alginate = 1.5 to 3 min Setting time of Normal-setting alginate = 3 to 4.5 min
sciq
sciq_01_04085
The common earthworm and leeches are examples of what type of worm?
[ "castrated", "segmented", "encapsulated", "elongated" ]
B
Segmented worms include the common earthworm and leeches.
ARC-Challenge
arc_04_02983
Paul observes four different samples of water. He records the temperature and volume of each sample. Which of his samples contains the greatest amount of thermal energy?
[ "100 mL of 10°C water", "100 mL of 25°C water", "5 liters of 10°C water", "5 liters of 25°C water" ]
D
null
ARC-Easy
arc_04_01483
The students watch ocean waves crash on a beach. Which statement describes what will most likely happen because of the waves?
[ "Grass on the beach will grow longer.", "Sand from the beach will wash away.", "Salt from the ocean will be left on the beach.", "Currents in the ocean will become stronger." ]
B
null
sciq
sciq_01_08677
What are hurricanes called in the pacific?
[ "twisters", "rainstorms", "typhoons", "tornados" ]
C
Tornadoes may also come from hurricanes. A hurricane ( Figure below ) is an enormous storm with high winds and heavy rains. Hurricanes may be hundreds of kilometers wide. They may travel for thousands of kilometers. The storm's wind speeds may be greater than 251 kilometers (156 miles) per hour. Hurricanes develop from...
ARC-Easy
arc_04_01542
Male peacocks have large brightly colored tail feathers. What is the most likely reason for this?
[ "to attract potential mates", "to distract potential predators", "to help catch food", "to preserve warmth" ]
A
null
sciq
sciq_01_10013
How many valves are in the heart?
[ "two", "four", "six", "one" ]
B
So how is the blood kept from flowing back on itself? Valves ( Figure below ) in the heart keep the blood flowing in one direction. The valves do this by opening and closing in one direction only. Blood only moves forward through the heart. The valves stop the blood from flowing backward. There are four valves of the h...
sciq
sciq_01_08512
Pauropods, presumed relatives of millipedes usually found in soil, leaf litter and other moist places, live on all continents except what?
[ "antarctica", "inland", "Europe", "Ocean" ]
A
The pauropods are typically 0.5-2.0 mm long and live on all continents except Antarctica. They are usually found in soil, leaf litter, or other moist places. They feed on fungi and decaying organic matter, and are essentially harmless. Adult pauropods have 11 or 12 body segments and 9-11 pairs of legs. They also posses...
medmcqa
medmcqa_05_03478
what is the most likely age of this child a victim of rape being examined under Posco act
[ "4 years", "7yrs", "10 yrs", "13 yrs" ]
B
ref : naryana reddy 10th ed
ARC-Easy
arc_04_00412
Rocks can be classified many different ways, including as igneous, metamorphic, and sedimentary. This classification is based on the
[ "origin of the rocks.", "use of the rocks.", "size of the rocks.", "hardness of the rocks." ]
A
null
sciq
sciq_01_04985
Where is pedocal soil commonly found?
[ "forests", "grasslands", "slopes", "deserts" ]
B
Pedocal is the soil common in grasslands. The more arid climate increases calcium in the soil. Pedocal is not as fertile.
medmcqa
medmcqa_05_03322
Dural hemorrhage seen in
[ "Brain", "Kidney", "Hea", "Lung" ]
A
*dural hemorrhage occur due to rupture of cerebral veins in the dural space . An intracranial hematoma is a collection of blood within the skull, most commonly caused by rupture of a blood vessel within the brain or from trauma such as a car accident or fall. The blood collection can be within the brain ptissue or unde...
math_qa
mathqa_03_02352
if n = 2.0823 and n * is the decimal obtained by rounding n to the nearest hundredth , what is the value of n * – n ?
[ "- 0.0053", "- 0.0023", "0.0007", "0.0047" ]
B
"n * = 2.08 n * - n = 2.08 - 2.0823 - 0.0023 answer : b"
medmcqa
medmcqa_05_03689
Intermittent dysphagia is caused by? 1. Stricture 2. Reflux esophagitis 3. Achalasia cardia 4. Pharyngeal diveiculum 5. Diffuse esophageal spasm
[ "1,2 & 3", "2,3 & 4", "4 & 5", "3,4 & 5" ]
C
Intermittent dysphagia Progressive dysphagia Diffuse esophageal spasm Pharyngeal diveiculum Schatzki ring Esophagitis Carcinoma esophagus Stricture Achalasia cardia Also know: Dysphagia more for solid than liquid implies mechanical obstruction (Ca esophagus, stricture, webs) Dysphagia equal for both solid and liquid fr...
math_qa
mathqa_03_04334
18 men can complete a piece of work in 20 days . in how many days can 12 men complete that piece of work ?
[ "23 days", "30 days", "22 days", "29 days" ]
B
"b 30 days 18 * 20 = 12 * x = > x = 30 days"
ARC-Easy
arc_04_01944
Which will most likely cause a decrease in predator populations?
[ "an increase in prey populations", "a decrease in prey populations", "a decrease in decomposers", "an increase in producers" ]
B
null
medmcqa
medmcqa_05_00867
A 62-year-old woman presents with fever, cough, sputum production, and pleuritic chest pain. CXR reveals a right middle lobe infiltrate, and she is started on antibiotics for the treatment of pneumonia. Her sputum Gram stain is positive for S. pneumoniae. Which of the following immunologic mechanisms is the most specif...
[ "intact splenic function", "intact complement function", "IgG antibody directed against capsular antigens", "alveolar macrophages" ]
C
The most specific immunologic defense is directed at capsular antigens and is serotype specific. Antibodies are not naturally occurring, but are the result of prior colonization, infection, or vaccination. Intact spleen, complement and macrophage function is important in clearance of pneumococci from sterile areas, but...
openbookqa
obqa_02_01979
What is a source of energy for animals?
[ "grains", "air", "space", "sunlight" ]
A
food is a source of energy for animals
sciq
sciq_01_08510
Although individuals of a given species are genetically similar, they are not identical; every individual has a unique set of these?
[ "habits", "chromosomes", "mutations", "traits" ]
D
The generation of genetic maps requires markers, just as a road map requires landmarks (such as rivers and mountains). Early genetic maps were based on the use of known genes as markers. More sophisticated markers, including those based on non-coding DNA, are now used to compare the genomes of individuals in a populati...
ARC-Challenge
arc_04_02463
Dr. Tanaka discovered a new virus. The virus has a single strand of a nucleic acid, but she does not know if it is DNA or RNA. After running tests, she concludes that it is DNA. Which of the following would lead her to that conclusion?
[ "It contains uracil.", "It contains adenine.", "It contains thymine.", "It contains cytosine." ]
C
null
openbookqa
obqa_02_03020
If the world has a universal temp increase, then
[ "ice chunks get small", "glaciers will grow larger", "water will stop existing", "things will be fun" ]
A
if the atmospheric temperature rises then the glaciers will melt
openbookqa
obqa_02_04178
An acquired characteristic is
[ "a permanent welt gotten many years ago", "freckles from your mom's genes", "a large nose just like your dad's", "brown, curly hair that resembles your sister's" ]
A
an organism 's environment affects that organism 's acquired characteristics
math_qa
mathqa_03_00505
a certain bag contains 60 balls — 22 white , 18 green , 8 yellow , 5 red , and 7 purple . if a ball is to be chosen at random , what is the probability that the ball will be neither red nor purple ?
[ "0.09", "0.15", "0.54", "0.8" ]
D
"according to the stem the ball can be white , green or yellow , so the probability is ( white + green + yellow ) / ( total ) = ( 22 + 18 + 8 ) / 60 = 48 / 60 = 0.8 . answer : d ."
sciq
sciq_01_05523
More uv rays reach the ground due to a decrease in what layer in the stratosphere?
[ "gases", "troposphere", "ozone", "smog" ]
C
With less ozone in the stratosphere, more UV rays reach the ground. More UV rays increase skin cancer rates. Just a 1 percent loss of ozone causes a 5 percent increase in skin cancer. More UV rays also harm plants and phytoplankton. As a result, they produce less food. This may affect entire ecosystems.
medmcqa
medmcqa_05_04235
Inducing agent of choice in shock ?
[ "Isoflurane", "Desflurane", "Ketamine", "Thiopentone" ]
C
Ans. is 'c' i.e., Ketamine Inducing agent of choice in Asthma & COPD Ketamine. Inhalational agent of choice in Asthma & COPD --) Halothane.
openbookqa
obqa_02_01014
What can can cause more harm then good when used?
[ "hiking boots", "hybrid cars", "anti bacteria soap", "bike" ]
C
good bacteria grow on the skin
sciq
sciq_01_03596
What kingdom of organisms constitutes up to 20 percent of all living things on earth in mass?
[ "archaeans", "vertebrates", "sporozoans", "protists" ]
A
Not all archaeans live in extreme conditions. In fact, archaeans are now known to live just about everywhere on Earth. They make up as much as 20 percent of Earth's total mass of living things.
math_qa
mathqa_03_00172
patrick purchased 70 pencils and sold them at a loss equal to the selling price of 20 pencils . the cost of 70 pencils is how many times the selling price of 70 pencils ?
[ "0.75", "0.8", "1", "1.28" ]
D
"say the cost price of 70 pencils was $ 70 ( $ 1 per pencil ) and the selling price of 1 pencil was p . selling at a loss : 70 - 70 p = 20 p - - > p = 7 / 9 . ( cost price ) / ( selling price ) = 1 / ( 7 / 9 ) = 9 / 7 = 1.28 . answer : d ."
openbookqa
obqa_02_01723
Due to weathering
[ "large submarines are built", "new bikes are raced", "holes in the pathway", "2nd story houses are built" ]
C
weathering means breaking down surface materials from larger whole into smaller pieces by weather
sciq
sciq_01_04208
What term describes the process where organisms convert atmospheric nitrogen into biologically useful chemicals?
[ "cellular respiration", "carbon cycle", "nitrogen fixation", "photosynthesis" ]
C
Most pure nitrogen comes from the fractional distillation of liquid air. The atmosphere consists of 78% nitrogen by volume. This means there are more than 20 million tons of nitrogen over every square mile of the earth’s surface. Nitrogen is a component of proteins and of the genetic material (DNA/RNA) of all plants an...
openbookqa
obqa_02_04033
which one of these is approximately opposite in acquisition to doing chores?
[ "instinctive behavior", "cleaning the yard", "mowing the lawn", "washing the dishes" ]
A
doing chores is a learned characteristic
ARC-Easy
arc_04_01864
When a dog smells food and begins drooling, it is responding to an external stimulus. Which of these describes a response to an internal stimulus?
[ "A cat sees a mouse and crouches.", "A parrot hears a name and repeats it.", "A person eats spoiled food and vomits.", "A worm senses water and moves to the surface." ]
C
null
openbookqa
obqa_02_04709
sugar dissolves in what when they are combined?
[ "dirt", "ocean liquid", "honey", "air" ]
B
sugar dissolves in water when they are combined
sciq
sciq_01_04243
What explains why two different species cannot occupy the same niche in the same place for very long?
[ "competive exclusion princple", "survival exclusion princple", "evolution", "natural selection" ]
A
A given habitat may contain many different species, but each species must have a different niche. Two different species cannot occupy the same niche in the same place for very long. This is known as the competitive exclusion principle . If two species were to occupy the same niche, what do you think would happen? They ...
sciq
sciq_01_00921
What is the process that breaks down rocks into smaller pieces?
[ "bleaching", "erosion", "weathering", "bracing" ]
C
openbookqa
obqa_02_00840
What can cause a process that has a negative effect on the environment?
[ "pulleys", "sharks", "tillage", "ice" ]
C
erosion of soil has a negative impact on the environment
sciq
sciq_01_03410
What are carbonated beverages pressurized with?
[ "helium", "hydrogen", "dioxide", "co2" ]
D
NaN3 is 1.847 g/cm . What is the volume of the gas produced compared to the solid reactant? Suggest a plausible reason to explain why skin burns can result from the inflation of an airbag during an automobile accident. Under basic conditions, the reaction of hydrogen peroxide (H 2O2) and potassium permanganate (KMnO4) ...
ARC-Easy
arc_04_00380
After playing outside on a cold day, Jaime went inside to wash his hands. Although the water was normal temperature, he noticed that it felt warmer than usual. What would explain this phenomenon?
[ "His body had more kinetic energy than the water.", "Heat flowed from a cooler substance to a warmer substance.", "The water from the faucet had a higher temperature than his skin.", "The thermal energy in the room was higher than the thermal energy outside." ]
C
null
medmcqa
medmcqa_05_00263
Unilateral elevation of diaphragm is commonly due to
[ "Obesity", "Large Liver", "Scoliosis", "Congenital causes" ]
B
Causes of unilateral elevation of the dome of diaphragm: 1. Idiopathic 2. Eventration 3. Muscular disease 4. Radiation therapy 5. Neurologic disease (Stroke, polio) 6. Trauma, Erb's palsy
sciq
sciq_01_03870
Dry soils are relatively unproductive because plants need a sufficient quantity of liquid water to carry out what process?
[ "photosynthesis", "flowering", "shrinkage", "contraction" ]
A
medmcqa
medmcqa_05_00457
The following drug has maximum propensity to cause peripheral neuropathy-
[ "Didanosine", "Zidovudine", "Stavudine", "Lamivudine" ]
C
Ans. is 'c' i.e., Stavudine Peripheral neuropathy occurs upto 71% of patients with stavudine monotherapy, while it occurs in 20% of patients with didanosine therapy. o Lamivudine and zidovudine do not cause peripheral neuropathy.
medmcqa
medmcqa_05_03294
Which of the following is the most impoant pa of brain involved in Narcolepsy
[ "Neocoex", "Hypothalamus", "Hippocampus", "Pons" ]
B
Answer is B (Hypothalamus): Narcolepsy in humans is caused by deficiency of hypocretin (Orexin) a neurotransmitter produced in the Hypothalamus. Recently several convergent lines of evidence suggest that the hypothalamic neuropeptide hypocretin (orexin) is involved in the pathogenesis of Narcolepsy'- Harrison's 181h/22...
sciq
sciq_01_05355
What kind of interference is observed when the paths differ by a whole wavelength, and the waves arrive in phase?
[ "constructive interference", "spontaneous interference", "necessary interference", "non-interference" ]
A
To understand the double slit interference pattern, we consider how two waves travel from the slits to the screen, as illustrated in Figure 27.13. Each slit is a different distance from a given point on the screen. Thus different numbers of wavelengths fit into each path. Waves start out from the slits in phase (crest ...
math_qa
mathqa_03_01752
an aeroplane covers a certain distance of 420 kmph in 6 hours . to cover the same distance in 4 2 / 3 hours , it must travel at a speed of ?
[ "450 km", "480 km", "500 km", "540 km" ]
D
"speed of aeroplane = 420 kmph distance travelled in 6 hours = 420 * 6 = 2520 km speed of aeroplane to acver 2520 km in 14 / 3 = 2520 * 3 / 14 = 540 km answer : option ' d '"
openbookqa
obqa_02_02107
Which creature would be safest from predators in its natural underground habitat?
[ "moles", "lizards", "eagles", "sardines" ]
A
living underground can be used for hiding from predators
sciq
sciq_01_02176
The polymerase chain reaction is a way of making copies of what?
[ "a method", "a form", "an enzyme", "a gene" ]
D
The polymerase chain reaction is a way of making copies of a gene. It uses high temperatures and an enzyme to make new DNA molecules. The process keeps cycling to make many copies of a gene.
medmcqa
medmcqa_05_02627
The shown penile lesion is:
[ "Genital wa", "Pearly penile papule", "Balanitis", "Sebaceous gland prominence" ]
B
Pearly papules : - Asymptomatic - Seen in uncircumcised patients - Etiology unknown - Not infective - Normal lesions - No treatment required
ARC-Easy
arc_04_00338
A loaf of bread is baking in a pan in a 350° F oven. What would cause a burn to a hand the quickest because of its low specific heat?
[ "the metal pan", "the air in the oven", "the surface of the bread", "the outside of the oven door" ]
A
null
math_qa
mathqa_03_04249
a driver goes on a trip of 50 kilometers , the first 25 kilometers at 66 kilometers per hour and the remaining distance at 33 kilometers per hour . what is the average speed of the entire trip in kilometers per hour ?
[ "38", "40", "44", "45" ]
C
the time for the first part of the trip was 25 / 66 hours . the time for the second part of the trip was 25 / 33 hours . the total time fro the trip was 25 / 66 + 25 / 33 = 75 / 66 = 25 / 22 hours . the average speed for the trip was 50 / ( 25 / 22 ) = 44 kph the answer is c .
math_qa
mathqa_03_04867
due to construction , the speed limit along an 6 - mile section of highway is reduced from 55 miles per hour to 35 miles per hour . approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?
[ "4", "8", "10", "15" ]
A
6 / 35 - 6 / 55 = 6 / 5 * ( 11 - 7 ) / 77 = 6 / 5 * 4 / 77 * 60 min = 6 * 12 * 4 / 77 = 288 / 77 ~ 3.7 answer - a
ARC-Challenge
arc_04_02449
In a grassland ecosystem, if the population of eagles suddenly decreased, what will most likely be the effect on the rest of the ecosystem?
[ "The ecosystem will become overpopulated with snakes.", "There will be a decrease in the population of snakes in the ecosystem.", "The nutrition of the soil in the ecosystem will decrease.", "More types of plants will begin growing in the ecosystem." ]
A
null
medmcqa
medmcqa_05_03127
Myelination of optic nerve begins at what gestational age-
[ "2 month", "4 month", "5 month", "7 month" ]
D
Ans. is 'd' i.e., 7 months o Myelination of optic nerves starts between 6 and 8 months of gestational age.o Myelination of the optic nerves begins at the lateral geniculate nucleus, reaching the orbital part of the optic nerve at term, and continues over the following 2 years postnatally.o Myelination of geniculostriat...