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math_qa
mathqa_03_04105
what is the decimal equivalent of ( 1 / 4 ) ^ 6 ?
[ "0.0016", "0.0625", "0.16", "0.0002" ]
D
"( 1 / 4 ) ^ 6 = 1 / 4096 = 0.0002 answer : d"
sciq
sciq_01_03052
What is a key factor in the growth of populations?
[ "assimilation", "immigration", "gentrification", "legislation" ]
B
Moving into an area, or immigration, is a key factor in the growth of populations. Shown above is actual vintage luggage left by some of the millions of immigrants who came through Ellis Island and into the United States.
math_qa
mathqa_03_02108
4.2 x 4.2 - 1.9 x 1.9 / 2.3 x 6.1 is equal to :
[ "2", "1", "3", "4" ]
B
"given expression = ( a 2 - b 2 ) / ( a + b ) ( a - b ) = ( a 2 - b 2 ) / ( a 2 - b 2 ) = 1 . answer is b ."
sciq
sciq_01_04858
What are the preserved remains of animals, plants, and other organisms called?
[ "skulls", "basalt", "rocks", "fossils" ]
D
Fossils are the preserved remains of animals, plants, and other organisms from the distant past. Examples of fossils include bones, teeth, and impressions. By studying fossils, evidence for evolution is revealed. Paleontologists are scientists who study fossils to learn about life in the past. Fossils allow these scien...
openbookqa
obqa_02_00299
Because of human logging activities, some animals have to conserve their
[ "air", "water", "legs", "food" ]
D
when available resources decrease in an environment , organisms have to conserve those resources
ARC-Easy
arc_04_02129
A dog gets the energy it needs to run from ___.
[ "the air", "the Sun", "food", "water" ]
C
null
sciq
sciq_01_06690
Which organ in the human body filters blood and excretes urine?
[ "the liver", "the kidney", "the thyroid", "the bladder" ]
B
The kidneys filter all the blood in the body many times each day and produce a total of about 1.5 liters of urine . The kidneys control the amount of water, ions, and other substances in the blood by excreting more or less of them in urine. The kidneys also secrete hormones that help maintain homeostasis. Erythropoieti...
sciq
sciq_01_08431
Aquatic biomes are determined mainly by distance from shore and what other factor?
[ "water temperature", "salinity", "depth of water", "species populations" ]
C
Aquatic biomes are determined mainly by depth of water and distance from shore. They include freshwater and marine biomes.
openbookqa
obqa_02_01482
Where would you be most likely to observe the most diverse of all marine ecosystems?
[ "The Sahara Desert", "off Australia's shore", "silicon valley", "Pacific Northwest" ]
B
coral lives in the ocean
sciq
sciq_01_02115
Particles of a gas are constantly moving and bumping into things. this gives gases what?
[ "strength", "pressure", "velocity", "resistance" ]
B
Particles of a gas are constantly moving and bumping into things. This gives gases pressure.
openbookqa
obqa_02_01701
Speed is measuring how fast an object is doing what?
[ "melting", "evaporating", "rotating", "changing location" ]
D
speed is a measure of how fast an object is moving
openbookqa
obqa_02_03047
Which would most directly benefit from installing receptors for converting light into power?
[ "a family of humans in a city where it rains every day", "a herd of crows", "a research base near the equator", "a group of squirrels" ]
C
a solar panel converts sunlight into electricity
math_qa
mathqa_03_02509
what is the remainder when 3 ^ 29 is divided by 5 ?
[ "0", "1", "2", "3" ]
D
"the units digit of powers of 3 follow a repeating cycle of four : { 3 , 9 , 7 , 1 } 29 has the form 4 k + 1 , so the units digit of 3 ^ 29 is 3 . the remainder when dividing by 5 is 3 . the answer is d ."
math_qa
mathqa_03_01088
if n = 7 ^ 11 – 7 , what is the units digit of n ?
[ "0", "1", "4", "6" ]
D
always divide the power ( incase 11 ) by 4 and use the remainder as the new power . the question now becomes 7 ^ 3 - 7 . now 7 ^ 3 has last digit 3 . since 7 ^ 11 ( or for that matter 7 ^ 3 ) is greater than 7 , we subtract 7 from 13 ( the 10 + 3 - - > 10 has come from carry over from the tenth place ) . thus 13 - 7 = ...
ARC-Easy
arc_04_01160
Which of these is a nonliving part of a forest?
[ "Tree", "Soil", "Worm", "Mushroom" ]
B
null
sciq
sciq_01_07615
What does photosynthesis allow plants to generate?
[ "enriched molecules", "geometric molecules", "organic molecules", "clorophyll" ]
C
sciq
sciq_01_11494
What type of boiling point do nonmetals normally have?
[ "low", "odd", "high", "even" ]
A
Properties of nonmetals include a relatively low boiling point, so many nonmetals are gases. Nonmetals are also poor conductors of heat, and solid nonmetals are dull and brittle.
medmcqa
medmcqa_05_01169
Antidepressant causing Tardive dyskinesia is ?
[ "MAO inhibitors", "Mianserin", "Imipramine", "Amoxapine" ]
D
Ans. is 'd' i.e., Amoxapine Amoxapine is the only antidepressant which blocks D2 receptors along with inhibition of NA reuptake - has mixed antidepressant + neurolepic propey. Due to blockade of D, receptors it causes extrapyramidal side effects -4 Parkinsonism, Tardive dyskinesia, Akathesia, neuropeptic malignant synd...
openbookqa
obqa_02_01194
What is an example of if an organism becomes too hot then that organism may die?
[ "a dog panting under the hot sun", "a bear shedding fur to cool off", "an earthworm drying up on a sidewalk", "a bird stopping to rest after a long flight" ]
C
if an organism becomes too hot then that organism may die
ARC-Easy
arc_04_00565
Byron is investigating how temperature affects mold growth on bread. Before starting his procedure, Byron states in his journal that he thinks wet bread placed in the refrigerator will grow the most mold. Which term best describes Byron's statement?
[ "conclusion", "result", "hypothesis", "variable" ]
C
null
sciq
sciq_01_01382
What is the outermost layer of the skin?
[ "nexus", "callus", "epidermis", "dermis" ]
C
The epidermis is the outermost layer of the skin. It forms the waterproof, protective wrap over the body's surface. Although the top layer of epidermis is only about as thick as a sheet of paper, it is made up of 25 to 30 layers of cells. The epidermis also contains cells that produce melanin. Melanin is the brownish p...
sciq
sciq_01_00488
An antigen is a molecule that reacts with some component of the what response?
[ "fight or flight", "hormones", "immune", "digestion" ]
C
Chapter 42 1 Figure 42.11 C 3 Figure 42.16 If the blood of the mother and fetus mixes, memory cells that recognize the Rh antigen can form late in the first pregnancy. During subsequent pregnancies, these memory cells launch an immune attack on the fetal blood cells. Injection of anti-Rh antibody during the first pregn...
math_qa
mathqa_03_03427
a dishonest shopkeeper professes to sell pulses at the cost price , but he uses a false weight of 950 gm . for a kg . his gain is … % .
[ "5.3 %", "8.2 %", "4.3 %", "8.3 %" ]
A
he sells 950 grams of pulses and gains 50 grams . if he sells 100 grams of pulses then he will gain ( 50 / 950 ) * 100 = 5.26 4 . a software engineer has the capability of thinking 100 lines of code in five minutes and can type 100 lines of code in 10 minutes . he takes a break for five minutes after every ten minutes ...
medmcqa
medmcqa_05_04114
Trendlenburg's test done for varicose veins is for detection of:
[ "Perforator in competency", "Deep veins patency", "Saphenofemoral incompetency", "Site of perforators" ]
C
Ans: C (Saphenofemoral incompetency) Ref : 74 A Manual on Clinical Surgery S. DasExplanation:Clinical Examination of Varicose VeinsBrodie-Trendelenherg TestDone to determine the incompetency of Saphenofemoral valve.Patient is placed in recumbent position.Limbs are raised to empty the veins. Veins are milked proximally ...
sciq
sciq_01_10709
What also receives input from other areas of the forebrain through the medial forebrain bundle?
[ "pituitary gland", "hypothalamus", "optic chiasm", "hippocampus" ]
B
These two tracts connect the hypothalamus with the major parasympathetic nuclei in the brain stem and the preganglionic (central) neurons of the thoracolumbar spinal cord. The hypothalamus also receives input from other areas of the forebrain through the medial forebrain bundle. The olfactory cortex, the septal nuclei ...
sciq
sciq_01_10132
What type of biomes are found in the salt water of the ocean?
[ "marine", "surreal", "major", "active" ]
A
Marine biomes are found in the salt water of the ocean.
math_qa
mathqa_03_04666
a , b and c started a business with a total investment of rs . 90000 . a invests rs . 6000 more than b and b invests rs . 3000 less than c . if the total profit at the end of a year is rs . 8640 , find a ' s share .
[ "rs . 3168", "rs . 2520", "rs . 2880", "rs . 3360" ]
A
"explanation : let c ' s investment = rs . x b ' s investment = rs . ( x - 3000 ) a ' s investment = rs . ( x - 3000 + 6000 ) = rs . ( x + 3000 ) now , ( a + b + c ) ' s investment = rs . 90000 = > x + ( x - 3000 ) + ( x + 3000 ) = 90000 = > 3 x = 90000 = > x = 30000 hence , a ' s investment = rs . 33000 b ' s investme...
medmcqa
medmcqa_05_00335
Commonest ovarian tumor complicating pregnancy is : commonest ovariantumor complicating preg? nancy is :
[ "Fibroma", "Mucinous cystadenocarcinoma", "Serous cystadenocarcinoma", "Dermoid" ]
D
Dermoid
sciq
sciq_01_03835
Where can composite volcanoes most frequently be found?
[ "astatine boundaries", "divergent boundaries", "convergent boundaries", "transform boundaries" ]
C
Composite volcanoes are common at convergent boundaries. Shield volcanoes are produced at divergent plate boundaries and intraplate.
ARC-Easy
arc_04_00986
Which of these is a renewable resource found in Nevada?
[ "zinc metal", "gravel deposits", "petroleum products", "geothermal energy" ]
D
null
openbookqa
obqa_02_00332
What is an example of the sun being directly overhead at noon?
[ "shadows disappear at noon", "the shadows on trees are longest at noon", "sundials can tell time easiest using shadows", "the sun is hottest at noon" ]
A
the sun is located directly overhead at noon
openbookqa
obqa_02_01307
A person has sand in their shoe from the beach, and they dump the sand out at their doorstep many miles away. The sand could end up back on that beach if
[ "magic creatures move it", "someone goes to the zoo", "a large gust passes", "people wish for it" ]
C
wind carries sand from one place to another place
ARC-Challenge
arc_04_02323
In addition to oxygen, what do plants produce during photosynthesis?
[ "chlorophyll", "sugar", "carbon dioxide", "light energy" ]
B
null
math_qa
mathqa_03_01079
an article with cost price of 192 is sold at 25 % profit . what is the selling price ?
[ "198", "200", "204", "240" ]
D
"sp = 1.25 * 192 = 240 answer : d"
sciq
sciq_01_01667
What is the type of cell division where the number of chromosomes is reduced in half?
[ "meiosis", "interphase", "cloning", "mitosis" ]
A
The process that produces haploid gametes is meiosis. Meiosis is a type of cell division in which the number of chromosomes is reduced by half. It occurs only in certain special cells of the organisms. During meiosis, homologous chromosomes separate, and haploid cells form that have only one chromosome from each pair. ...
openbookqa
obqa_02_03674
The sun is
[ "Square shaped", "caused by wind", "Cold", "has nuclear mechanics" ]
D
a star is a source of light energy through nuclear reactions
sciq
sciq_01_02678
What occurs at joints?
[ "respiration", "digestion", "body movements", "nothing" ]
C
Movements of the body occur at joints. Describe how muscles are arranged around the joints of the body.
sciq
sciq_01_09866
The vas deferens and ejaculatory ducts are part of what system?
[ "male reproductive system", "female reproductive system", "male circulatory system", "female adaptive system" ]
A
In addition to these organs, the male reproductive system consists of a series of ducts and glands. Ducts include the vas deferens and ejaculatory ducts. They transport sperm from the epididymis to the urethra in the penis. Glands include the seminal vesicles and prostate gland . They secrete substances that become par...
openbookqa
obqa_02_02044
matter is made of what?
[ "united atoms", "sound", "feelings", "bonds of friendship" ]
A
matter is made of molecules
sciq
sciq_01_06961
What type of science is the study of matter and energy and includes chemistry and physics?
[ "Earth science", "biology", "physical science", "genetics" ]
C
Physical science is the study of matter and energy. It includes chemistry and physics.
math_qa
mathqa_03_02653
what are the last two digits of ( 301 * 402 * 503 * 604 * 646 * 547 * 448 * 349 ) ^ 2
[ "96", "76", "56", "36" ]
B
"( ( 301 * 402 * 503 * 604 * 646 ) * ( 547 * 448 * 349 ) ) ^ 2 if you observe above digits , last digit are : 1,2 , 3,4 , 6,7 , 8,9 ; 5 is missing ; so i have rearranged them so that multiplication will be easy for me as initial 4 digits have last two digits as 01 , 02,03 , 04,46 and final three as 47 * 48 * 49 . solvi...
sciq
sciq_01_04414
Mutations in regulatory genes that normally control the cell cycle cause what?
[ "tumors", "cancer", "anxiety", "illness" ]
B
Mutations in regulatory genes that normally control the cell cycle cause cancer.
ARC-Easy
arc_04_01539
According to the fossil record, when did episodes of rapid speciation commonly take place?
[ "while Earth's continents were joined", "while Earth's habitats were stable", "before major climatic changes", "following mass extinctions" ]
D
null
medmcqa
medmcqa_05_00997
A 40 years old female patient attends the OG department with swelling of legs for past one day. There is no history of fever. 2 years back she had a metastatic breast adenocarcinoma which was treated with paclitaxel and radiotherapy. Blood pressure 120/76 mmHg, Pulse rate 84/min, temperature 37.6 C, Respiratory rate 16...
[ "Dalteparin and enoxaparin together", "Warfarin therapy with a goal to maintain INR of 2-3", "Enoxaparin and warfarin therapy with a goal to maintain INR of 2-3", "Aspirin and warfarin therapy with a goal to maintain INR of 2-3" ]
C
Answer: c) Enoxaparin and warfarin therapy with a goal to maintain INR of 2-3 (HARRISON 19TH ED, P-1635)DEEP VEIN THROMBOSISMost common site of DVT - calf veinsRisk of pulmonary embolism is much higher with proximal DVT (40% to 50%) than with clots confined to the distal calf vessels (5% to 10%)Pain and swelling are th...
medmcqa
medmcqa_05_02330
Jansen disease is
[ "Defect of PTH receptor", "Defect of GH receptor", "Defect of ADH receptor", "Defect of Thyroid receptor" ]
A
.
ARC-Easy
arc_04_01966
A student climbs up a rocky mountain trail in Maine. She sees many small pieces of rock on the path. Which action most likely made the small pieces of rock?
[ "sand blowing into cracks", "leaves pressing down tightly", "ice breaking large rocks apart", "shells and bones sticking together" ]
C
null
sciq
sciq_01_00956
What is produced when a colorless solution of lead nitrate is added to a colorless solution of potassium iodide?
[ "blue solid precipitate", "purple solid precipitate", "yellow solid precipitate", "brown solid precipitate" ]
C
When a colorless solution of lead(II) nitrate is added to a colorless solution of potassium iodide, a yellow solid called a precipitate is instantly produced ( Figure below ). A precipitate is a solid product that forms from a reaction and settles out of a liquid mixture. The formation of a precipitate may also indicat...
medmcqa
medmcqa_05_02360
Courvoiser's law is related to
[ "Jaundice", "Ureteric calculi", "Poal hypeension", "The length of skin flap in skin grafting" ]
A
Courvoiser's law In obstruction of the common bile duct due to Stone, distension of gall bladder seldom occurs, the organ usually is shriveled If there is no disease in the gall bladder and the obstruction is due to cancer of ampulla, pancreas or bile duct, then gall bladder will be distended Ref: Sabiston 20th edition...
openbookqa
obqa_02_02874
If a light needs to be relocated to another room without leaving that room physically, a person could
[ "turn off all lights", "throw it in the yard", "get a new lamp", "redirect it with reflections" ]
D
a mirror is used for reflecting light
sciq
sciq_01_04573
The temperature at which something melts is refered to as what?
[ "precipitation point", "boiling point", "evaporation point", "melting point" ]
D
Both of these people are participating in a board sport, but the man on the left is snowboarding in Norway while the woman on the right is sandboarding in Dubai. Snow and sand are both kinds of matter, but they have different properties. What are some ways snow and sand differ? One difference is the temperature at whic...
openbookqa
obqa_02_02459
How low must be a population of some species drop before it is extinct?
[ "fifteen", "ten", "to nothing", "eighty" ]
C
if a population decreases to zero then that organism is extinct
openbookqa
obqa_02_03132
If crops are rotated then the crops planted would look like
[ "tomato, tomato, tomato, tomato", "beans, corn, peas, cucumbers", "beans, beans, beans, beans", "corn, corn, corn, corn," ]
B
crop rotation is when different crops are planted on a field in different years
sciq
sciq_01_06597
What plant hormone allows plants to curve in a specific direction?
[ "apoptosis", "auxin", "pheremone", "peptides" ]
B
Plants may not be able to move to another location, but they are able to change how they grow in response to their environment. Growth toward or away from a stimulus is known as a tropism ( Table below ). Auxins, a class of plant hormones, allow plants to curve in specific directions as they grow. The auxin moves to on...
sciq
sciq_01_05826
An endocrine disease usually involves the secretion of too much or not enough hormone by which gland?
[ "Thyroid", "Pituitary", "endocrine", "Pancreas" ]
C
Diseases of the endocrine system are fairly common. An endocrine disease usually involves the secretion of too much or not enough hormone by an endocrine gland. This may happen because the gland develops an abnormal lump of cells called a tumor. For example, a tumor of the pituitary gland can cause secretion of too muc...
ARC-Easy
arc_04_00767
Dominic placed a caterpillar in a container with different kinds of leaves. Which information should he record to find out what food this caterpillar eats?
[ "the type of leaves the caterpillar has eaten", "the amount of time for all the leaves to be eaten", "the number of leaves that were put in the container", "the number of minutes the caterpillar spends eating" ]
A
null
sciq
sciq_01_07788
What is a rigid layer that surrounds the plasma membrane of a plant cell?
[ "the cell center", "the nucleic wall", "mitochondria", "the cell wall" ]
D
The cell wall is a rigid layer that surrounds the plasma membrane of a plant cell. It supports and protects the cell. Tiny holes, or pores, in the cell wall allow water, nutrients, and other substances to move into and out of the cell. The cell wall is made up mainly of complex carbohydrates, including cellulose.
openbookqa
obqa_02_04724
What is part of an ecological system?
[ "waterfalls", "pulsars", "black holes", "asteroids" ]
A
an ecosystem contains nonliving things
openbookqa
obqa_02_00030
Matter in the gas phase has
[ "fluctuating volume", "turned up volume", "turned down volume", "steady volume" ]
A
Matter in the gas phase has variable volume
sciq
sciq_01_06872
Unlike wild animals, what type of species are genetically uniform, making them more vulnerable to die-out from disease?
[ "free-range species", "mammals", "urbane species", "domestic species" ]
D
Wild plants and animals maintain a valuable pool of genetic variation . This is important because domestic species are genetically uniform. This puts them at great risk of dying out due to disease.
sciq
sciq_01_08705
The force that blood exerts upon the walls of the blood vessels or upon the chambers of the heart is known as blood what?
[ "vaccuum", "pressure", "squeeze", "push" ]
B
20.2 Blood Flow, Blood Pressure, and Resistance Blood flow is the movement of blood through a vessel, tissue, or organ. The slowing or blocking of blood flow is called resistance. Blood pressure is the force that blood exerts upon the walls of the blood vessels or chambers of the heart. The components of blood pressure...
sciq
sciq_01_05084
Often primary producers, what term describes species considered the “base” or “bedrock” of a community, having the greatest influence on its overall structure?
[ "primary", "foundation", "fundamental", "consumable" ]
B
Foundation Species Foundation species are considered the “base” or “bedrock” of a community, having the greatest influence on its overall structure. They are often primary producers, and they are typically an abundant organism. For example, kelp, a species of brown algae, is a foundation species that forms the basis of...
sciq
sciq_01_10906
What is the percentage of production transferred from one trophic level to the next
[ "robust efficiency", "underlie efficiency", "hypothesized efficiency", "trophic efficiency" ]
D
ARC-Easy
arc_04_01555
What geographic obstacle causes water to condense in an air mass as the air mass moves?
[ "forests", "oceans", "prairies", "mountains" ]
D
null
medmcqa
medmcqa_05_00145
For which of the following diseases is enzyme replacement therapy available ?
[ "Albinism", "Neimann-Pick disease", "Metachromatic leukodystrophy", "Gaucher's disease" ]
D
Ans. is 'd' i.e., Gaucher's disease `Enzyme Replacement therapy is the treatment of choice for significantly afftected patients - Harrison `Cerezyme' a recombinantly produced acid f1 glucosidase is being currently used.'
medmcqa
medmcqa_05_01418
Ozurdex is-
[ "0.7% Dexamethasone", "0.7% Betamethasone", "0.3% Triamcinolone", "0.7% Triamcinolone" ]
A
Ans. is 'a' i.e., 0*7 % Dexamethasone Ozurdex is a dexamethasone implant in a concentration of 0.7 mg which is used for the treatment of macular edema due to central retinal vein occlusion. The standard care for CR VO used to be observation but now, the standard care is to watch the patient closely initially, but to us...
medmcqa
medmcqa_05_02703
A child has retained disc battery in the nose.What is the most impoant consideration in the management?
[ "Battery substance leaks and cause tissue damage", "It can lead to tetanus", "Refer the child to a specialist for removal of battery", "Instill nasal drops" ]
A
Most impoant consideration in thr management of retained disc battery in the nose of a child is the leakage of battery substance leading to tissue damage. Ref Dhingra 6/e,p 161.
medmcqa
medmcqa_05_00651
Total number of deciduous teeth in a 14 yr old child: September 2007
[ "0", "5", "10", "20" ]
A
Ans. A: 0 The deciduous dentition is made up of central incisors, lateral incisors, canines, first molars, and secondary molars; there is one in each quadrant, making a total of four of each tooth. All of these are replaced with a permanent counterpa except for the first and second molars; they are replaced by premolar...
medmcqa
medmcqa_05_04339
Which drug should not be given in pregnancy
[ "Labetolol", "ACE inhibitor", "Hydralizine", "Methyldopa" ]
B
Refer kDT 6/e p484 ACE inhibitor and ARBs are fetopathic potential, they are contraindicated in pregnancy. Treatment Table 1 Antihypeensive drugs to avoid in pregnancy and preconception ANTIHYPEENSIVE ADVICE ACE inhibitors Contraindicated Angiotensin receptor blockers Contraindicated Diuretics Avoid
sciq
sciq_01_05833
What is the smallest class of elements?
[ "metalloids", "synthetics", "noble gases", "halogens" ]
A
Metalloids are the smallest class of elements, containing just six elements. They fall between metals and nonmetals in the periodic table.
sciq
sciq_01_02086
What preventative measure is often delivered by injection into the arm?
[ "infection", "medication", "vaccine", "anesthesia" ]
C
Figure 42.18 Vaccines are often delivered by injection into the arm. (credit: U. Navy Photographer's Mate Airman Apprentice Christopher D. Blachly).
sciq
sciq_01_00217
What are groups of young stars loosely held together by gravity called?
[ "closed clusters", "open clusters", "constellations", "galaxies" ]
B
Open clusters are groups of young stars loosely held together by gravity.
sciq
sciq_01_11283
What specific part of the brain regulates the endocrine system?
[ "hypothalamus", "parietal lobe", "hippocampus", "frontal lobe" ]
A
The endocrine system consists of glands that secrete hormones into the bloodstream. It is regulated by a part of the brain called the hypothalamus, which also secretes hormones. The hypothalamus controls the pituitary gland, which is called the “master gland” of the endocrine system because its hormones regulate other ...
medmcqa
medmcqa_05_00961
Which is associated with shotgun alone -
[ "Gun powder", "Primer", "Projectile", "Wads" ]
D
Wads are present only in the cartridge of a shot gun.
math_qa
mathqa_03_00702
the average of first five prime numbers greater than 37 is ?
[ "32.2", "32.98", "42.3", "48.6" ]
D
"41 + 43 + 47 + 53 + 59 = 243 / 5 = 48.6 answer : d"
math_qa
mathqa_03_01296
pipe a can fill a tank in 24 minutes . pipe b can fill the same tank 6 times faster than pipe a . if both the pipes are connected to the tank so that they fill the tank simultaneously , how long will it take for the empty tank to overflow ?
[ "4 minutes", "32 / 7 minutes", "192 / 7 minutes", "3 minutes" ]
D
"pipe a can fill a tank in 24 minutes - - > the rate of a = 1 / 24 tank / minute ; pipe b can fill the same tank 6 times fasterthan pipe a - - > the rate of b = 1 / 24 + 6 / 24 = 7 / 24 tank / minute . their combined rate = 1 / 24 + 7 / 24 = 1 / 3 tank / minute ; therefore , a and b can fill the tank in 3 minutes . ans...
ARC-Challenge
arc_04_02806
Growth and activities of organisms can speed up the chemical weathering of rocks. Which organisms naturally cause most of the chemical weathering of rocks?
[ "small mammals", "plant seedlings", "mosses", "insects" ]
C
null
ARC-Challenge
arc_04_02690
Red-clay bricks have a density of approximately 2000 kg/m^3. Air has a density of 1 kg/m^3. Which of the following has the lowest mass?
[ "2 m^3 of bricks", "4 m^3 of bricks", "6000 m^3 of air", "10,000 m^3 of air" ]
A
null
sciq
sciq_01_00332
What important organelle (that would otherwise be centrally located and crucial to the cell's survival) do prokaryotic cells lack?
[ "nucleus", "protons", "molecules", "electrons" ]
A
Cell division is simpler in prokaryotes than eukaryotes because prokaryotic cells themselves are simpler. Prokaryotic cells have a single circular chromosome, no nucleus, and few other organelles. Eukaryotic cells, in contrast, have multiple chromosomes contained within a nucleus, and many other organelles. All of thes...
medmcqa
medmcqa_05_03599
Which of the following represents the mechanism of action of Eternacept?
[ "Blocking tumor necrosis factor", "Blocking bradykinin synthesis", "Blocking cyclo-oxygenase-2", "Blocking lipoxygenase" ]
A
Etanercept is a fusion protein of TNFRII and the Fc region of IgG1, that binds to TNF and prevent the molecule from interacting with its two receptors, TNFRI and TNFRII, thereby stopping signaling events. TNF is involved in inflammatory and immune responses. Etanercept can also modulate biologic responses regulated by ...
math_qa
mathqa_03_02395
0.0004 ? = 0.02
[ "0.02", "0.2", "2", "20" ]
A
"explanation : required answer = 0.0004 / 0.02 = 0.04 / 2 = 0.02 . answer : option a"
sciq
sciq_01_09768
The anterior pituitary produces seven different what, each with a special function?
[ "enzymes", "neurotransmitters", "proteins", "hormones" ]
D
Anterior Pituitary The anterior pituitary gland, or adenohypophysis, is surrounded by a capillary network that extends from the hypothalamus, down along the infundibulum, and to the anterior pituitary. This capillary network is a part of the hypophyseal portal system that carries substances from the hypothalamus to the...
ARC-Easy
arc_04_01824
A hillside along a highway has exposed layers of undisturbed sedimentary rock. Which method would be best for scientists to use to determine the relative age of these sedimentary rock layers?
[ "apply the law of superposition", "calculate the rate of radiometric decay", "apply the law of crosscutting relationships", "calculate the rate of tectonic plate movement" ]
A
null
medmcqa
medmcqa_05_02226
A 30-year-old G1P0 woman complains of nausea and vomiting for the first 3 months of her pregnancy. She is noted to have a hemoglobin level of 9.0 g/dl and a mean corpuscular volume of 110 fL (normal 90-105 fL). Which of the following is the most likely etiology of the anemia
[ "Iron deficiency", "Vitamin B12 deficiency", "Folate deficiency", "Physiologic anemia of pregnancy" ]
C
This is a macrocytic anemia because the mean corpuscular volume is above normal. Macrocytic anemias include folate deficiency and vitamin B12 deficiency; however, folate deficiency is more commonly seen in pregnancy than vitamin B12 deficiency. Iron deficiency is a microcytic anemia (MCV below normal), and it is the mo...
ARC-Challenge
arc_04_03068
Forests have been cut and burned so that the land can be used to raise crops. Which consequence does this activity have on the atmosphere of Earth?
[ "It reduces the amount of carbon dioxide production.", "It reduces the production of oxygen.", "It decreases the greenhouse effect.", "It decreases pollutants in the air." ]
B
null
medmcqa
medmcqa_05_01897
Which of the following respiratory structures is derived from the neural crest?
[ "Endothelial cells", "Epithelium of primary bronchi", "Laryngeal cailage", "Tracheal glands" ]
C
Laryngeal cailages (e.g., the thyroid, cricoid, arytenoid cailages) are derived from neural crest. The endothelial cells in the simple squamous epithelium that lines the pulmonary capillaries are derived from visceral mesoderm. The epithelial lining of primary bronchi is derived from endoderm. Tracheal glands and epith...
openbookqa
obqa_02_00732
What sense is associated with an animal's ingestion?
[ "taste", "hearing", "vision", "touch" ]
A
when an animal eats or drinks something , that animal tastes that something
openbookqa
obqa_02_02891
A seeing eye dog is able to do this better than his master:
[ "open a door", "speak out loud", "talk to friends", "observe visually" ]
D
seeing is used for sensing visual things
ARC-Easy
arc_04_01965
Index fossils help scientists estimate the age of a rock because index fossil species only existed for a relatively short time. What happened to the species that are now used as index fossils?
[ "They became extinct.", "They changed their diets.", "They hid in marine sediments.", "They migrated to new environments." ]
A
null
sciq
sciq_01_02845
What causes natural ripening in fruit?
[ "sulfur", "chloride", "acid", "ethylene" ]
D
medmcqa
medmcqa_05_03231
Plasma fluoride level expected in a healthy, fasting, long-term resident of a community with a water fluoride level of 1 ppm is approximately?
[ "0.01 ppm", "0.012 ppm", "0.015 ppm", "0.019 ppm" ]
D
The  ionic  fluoride  is of  public health significance. It varies  according  to the concentration of fluoride in the drinking water.  Its  plasma  concentration  is approximately  twice  as  high  as  that associated with the blood cells. Since plasma fluoride  levels  are  not  homeostatically regulated, there is no...
medmcqa
medmcqa_05_00112
A 30-year-old male HIV positive on antiretroviral therapy has pain in right hip region. Flexion, abduction and external rotation deformity of right hip for 2 months, what is the most likely diagnosis?
[ "Avascular necrosis", "TB hip", "Transient synovitis", "Septic arthritis" ]
B
(b) TB hip in HIVAVN hip in HIVIncidenceMore CommonLess CommonDeformityFABER-stage of synovitis may be prolonged on treatment, then subsequently with onset of arthritis - FADIRLimitation of abduction and internal rotation so initially position is adduction and external rotation (opposite to movements limited) and than ...
math_qa
mathqa_03_01750
ravi purchased a refrigerator and a mobile phone for rs . 15000 and rs . 8000 respectively . he sold the refrigerator at a loss of 4 percent and the mobile phone at a profit of 9 percent . overall he make a .
[ "228", "288", "27", "120" ]
D
let the sp of the refrigerator and the mobile phone be rs . r and rs . m respectively . r = 15000 ( 1 - 4 / 100 ) = 15000 - 600 m = 8000 ( 1 + 9 / 100 ) = 8000 + 720 total sp - total cp = r + m - ( 15000 + 8000 ) = - 600 + 720 = rs . 120 as this is positive , an overall profit of rs . 200 was made . answer : d
openbookqa
obqa_02_00328
Moving your face further from a mirror
[ "will make your face appear bigger", "will make your face appear in macro", "will make your wrinkles less obvious", "will make it easier to see your pores" ]
C
if an object is close then that object will appear large
ARC-Easy
arc_04_01188
Many birds fly south for the winter. This adaptation is called
[ "hibernation", "germination", "migration", "communication" ]
C
null
sciq
sciq_01_05586
What is the name for the water-splitting step of photosynthesis?
[ "cellular respiration", "peristalsis", "hydrolysis", "photolysis" ]
D
sciq
sciq_01_06507
When hit from behind in a car crash, a passenger can suffer a neck injury called what?
[ "inflammation", "whiplash", "twisted neck", "necklash" ]
B
When hit from behind in a car crash, a passenger can suffer a neck injury called whiplash . Explain in terms of inertia how this occurs, and how headrests can prevent the injury.
openbookqa
obqa_02_02713
Which would likeliest eat a sardine?
[ "a plant", "a tree", "a canary", "a tunafish" ]
D
tuna eat fish
math_qa
mathqa_03_00701
a train crosses a platform of 110 m in 15 sec , same train crosses another platform of length 250 m in 20 sec . then find the length of the train ?
[ "150", "88", "77", "310" ]
D
"length of the train be â € ˜ x â € ™ x + 110 / 15 = x + 250 / 20 4 x + 440 = 3 x + 750 x = 310 m answer : d"
ARC-Easy
arc_04_01212
Increased nutrient levels in lakes can cause ecological changes that result in the death of many fish. At what point in the hydrological cycle are most nutrients deposited into lakes?
[ "runoff", "evaporation", "precipitation", "transpiration" ]
A
null
sciq
sciq_01_03493
Human metabolism is the conversion of food into heat transfer, work, and this?
[ "stored atp", "stored fat", "stored carbs", "stored protein" ]
B
Human Metabolism and the First Law of Thermodynamics Human metabolism is the conversion of food into heat transfer, work, and stored fat. Metabolism is an interesting example of the first law of thermodynamics in action. We now take another look at these topics via the first law of thermodynamics. Considering the body ...