datavorous/entrance-exam-dataset huggingface dataset:
Select the correct statement:

Options:
A PH3 is reduces AgNO3 to metallic Ag.
B Organic tissues turn AgNO3 black by reducing it to Ag .
C AgCN is soluble in KCN .
D All are correct statements.

The correct answer is:
All are correct statements.

Solution:
(A) AgNO3+PH3âAgâHNO3+H3PO3
B AgNO3âOrganic tissueprotiensAgâblack
C Ag + +2KCN→ Ag CN 2 − +2 K +

Topic: Chemistry, d and f Block Elements, JEE Main
Select the correct statement.

Options:
A Arthropoda is the largest class of kingdom Animalia.
B Closed type of circulatory system is found in annelids.
C Neophron belongs to class Reptilia.
D Psittacula is the National bird of India.

The correct answer is:
Closed type of circulatory system is found in annelids.

Solution:
Circulatory system may be of:
I. Open type: Cell and tissues directly bath into the blood, e.g., Arthropods.
II. Closed type: Blood always remain in capillaries or other blood vessels but never come in direct contact of blood., e.g., Annelids and Chordates.

Topic: Biology, Animal Kingdom, NEET
Select the correct statement.

Options:
A Particulate matter of size $10 \mu \mathrm{m}$ can create severe damage to the lungs.
B Particulate matter of size greater than 2.5 $\mu \mathrm{m}$ can get trapped in lungs and cause problems.
C Particulate matter of size less than $2.5 \mu \mathrm{m}$ penetrate deep into lungs.
D None of the above.

The correct answer is:
Particulate matter of size less than $2.5 \mu \mathrm{m}$ penetrate deep into lungs.

Solution:
Particulate matter mainly includes dust, soot particles, volatile hydrocarbons, some sulphate and metallic residues emitted into the air by sources such as factories, power plants, vehicles, etc. PM is usually divided into different classes based on size ranging from total suspended matter (TSP) to PM-10 (particles with diameter of $10 \mu$ or less) to PM-2.5 (particles with diameter of $2.5 \mu$ or less). Smallest particles pose highest human health risk. Larger particles $(\leq 10 \mu)$ can easily be expelled from lungs through mucus but finer particles $(\leq 2.5 \mu)$ penetrate deep in lungs and can cause severe lung damage including lung cancer.

Topic: Biology, Environmental Issues, AIIMS, AIIMS 2012
Select the correct statement.

Options:
A Glucagon is associated with hypoglycemia.
B Insulin acts on pancreatic cells and adipocytes.
C Insulin is associated with hyperglycemia.
D Glucocorticoids stimulate gluconeogenesis

The correct answer is:
Glucocorticoids stimulate gluconeogenesis

Solution:
The corticoids, which are involved in carbohydrate metabolism, are called glucocorticoids and are released from zona fasciculata. In our body, cortisol is the main glucocorticoid. Glucocorticoids stimulate gluconeogenesis, lipolysis, and proteolysis; and inhibit cellular uptake and utilization of amino acids. Cortisol is also involved in maintaining the cardiovascular system as well as the kidney functions. Glucocorticoids, particularly cortisol, produce anti-inflammatory reactions and suppress the immune response. Cortisol stimulates RBC production.

Insulin acts mainly on hepatocytes and adipocytes (cells of adipose tissue) and is a hypoglycemic hormone, whereas glucagon is a hyperglycemic hormone.

Topic: Biology, Chemical Coordination and Integration, NEET, NEET 2020 (Phase 1)
Select the correct statement about biodiversity

Options:
A The desert areas of Rajasthan and Gujarat have a very high level of desert animal species as well as numerous rare animals
B Large scale planting of Bt cotton has no adverse effect on biodiversity
C Western Ghats have a very high degree of species richness and endemism
D Conservation of biodiversity is just a fad pursued by the developed countries

The correct answer is:
Western Ghats have a very high degree of species richness and endemism

Solution:
Western Ghat occur along the Western Coast of India in Maharashtra, Karnataka, Tamil Nadu and Kerala. There is high degree of endemism as well as richness of species of flowering plants, amphibians reptiles, some mammals and butterflies.
$B t$ cotton is insect resistant and thus disturbed the food chain.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2012 (Mains)
Select the correct statement about cellular respiration.

Options:
A Most of the energy is liberated as heat.
B Most of the energy is stored in the form of ADP.
C All liberated energy is stored as ATP.
D All liberated energy is stored as heat.

The correct answer is:
Most of the energy is liberated as heat.

Solution:
It is the mechanism of breakdown of food materials within the cell to release energy and the trapping of this energy for synthesis of ATP. Most of the liberated energy goes out as heat while remaining part is utilized to form ATP for future use.

Topic: Biology, Respiration in Plants, NEET
Select the correct statement about elements of group 15th.

Options:
A The order of stability of oxidation state for +3 is Bi3+>Sb3+>As3+ and for +5 is Bi5+<Sb5+<As5+
B In the case of nitrogen, all oxidation states from +1 to +4 tend to disproportionate in acid solution.
C There is considerable increase in covalent radius from N to P but from As to Bi only a small increase in covalent radius is observed.
D All of these

The correct answer is:
All of these

Solution:
(i) This is due to the inert pair effect in the heavier p-block elements.
(ii) 3HNO2âHNO3+ H2O + 2NO
(iii) This is due to the presence of completely filled d and l or f orbitals in heavier elements.
Covalent radius l pm; N = 70, P = 110, As = 120, Bi = 150.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), JEE Main
Select the correct statement about hormones and their actions

Options:
A Parathyroid hormone increases $\mathrm{K}^{+}$ absorption of the body.
B Insulin and glucagon helps to maintain blood sugar levels.
C Old aged people have weak immunity due to increased activity of thymus.
D Osteoporosis in women occurs due to increased levels of oestrogens.

The correct answer is:
Insulin and glucagon helps to maintain blood sugar levels.

Solution:
Parathyroid hormone (PTH) stimulates the reabsorption of $\mathrm{Ca}^{2+}$ by renal tubules and increases $\mathrm{Ca}^{2+}$ absorption from digested food. It means PTH increases the blood $\mathrm{Ca}^{2+}$ level. Old aged persons have weak immunity because thymus is degenerated in old individuals resulting in a decreased production of thymosin. Oestoporosis in women occurs due to decreased level of estrogen.

Topic: Biology, Chemical Coordination and Integration, AIIMS, AIIMS 2014
Select the correct statement among the following.

Options:
A Co (III) is stabilised in presence of weak field ligands, while Co (II) is stabilised in presence of strong field ligand.
B Four coordinated complexes of Pd (II) and Pt (II) are paramagnetic and square planar.
C [Ni(CN)4]4- ion and [Ni(CO)4] are tetrahedral and square planar respectively.
D Ni2+ ion does not form inner orbital octahedral complexes in presence of weak ligand fields.

The correct answer is:
Ni2+ ion does not form inner orbital octahedral complexes in presence of weak ligand fields.

Solution:
This problem includes conceptual mixing of CFSE, CFT and magnetism in coordination compounds. This problem can be solved by usual understanding of each statement as explained below :
(I) Both Co2+ and Co3+ are stabilised in presence of strong of field ligands due to high CFSE values.
(II) Due to higher Zeft values on the valence shell Pd2+ and Pt2+ cations, they always form inner orbital complexes but are diamagnetic in nature and square planar.
(III) [Ni(CO)4]; sp3, tetrahedral, Î¼ = 0 BM
[Ni(CN)4]4- ; dsp2, square planar, Î¼ = 0 BM
(IV) In Ni +2, pairing of electron do not occur in presence of weak field ligands, so they form an outer orbital complex.

Electronic distribution unaffected.

Topic: Chemistry, Coordination Compounds, JEE Main
Select the correct statement from the following.

Options:
A Fitness is the end result of the ability to adapt and get selected by nature.
B Natural selection and genetic variation are two main key point of Darwinian Theory of evolution.
C Adaptive ability is always inherited
D Placental wolf and Tasmanian wolf are example of homology.

The correct answer is:
Fitness is the end result of the ability to adapt and get selected by nature.

Solution:
Fitness is based on certain characteristics which are inherited and the ability to adapt to the changing environment. It is the end result of adaptation because a fit individual survives and unfit individuals are eliminated from the population. So Fitness is the end result of the ability to adapt and get selected by nature.

Topic: Biology, Evolution, NEET
Select the correct statement from the following :

Options:
A
Electromagnetic waves cannot travel in vacuum.

B
Electromagnetic waves are longitudinal waves.

C
Electromagnetic waves are produced by charges moving with uniform velocity.

D
Electromagnetic waves carry both energy and momentum as they propagate through space.

The correct answer is:
Electromagnetic waves carry both energy and momentum as they propagate through space.

Solution:
Electromagnetic waves do not required any medium to propagate. They can travel in vacuum. They are transverse in nature like light. They carry both energy and momentum.
A changing electric field produces a changing magnetic field and vice-versa. Which gives rise to a transverse wave known as electromagnetic wave.

Topic: Physics, Electromagnetic Waves, JEE Main, JEE Main 2013 (23 Apr Online)
Select the correct statement from the following

Options:
A The orbital velocity of a satellite increases with the radius of the orbit
B Escape velocity of a particle from the surface of the earth depends on the speed with which it is fired
C The time period of a satellite does not depend on the radius of the orbit
D The orbital velocity is inversely proportional to the square root of the radius of the orbit

The correct answer is:
The orbital velocity is inversely proportional to the square root of the radius of the orbit

Solution:
Consider an astronomical body in which the mass is distributed spherically. Let M(r) be the amount of mass that is contained within a distance $\mathbf{r}$ of the center of the body.
For circular orbits the gravitational attraction for a mass $m$ has to balance the centrifugal force for that mass in the orbit. This means that
$\frac{\mathrm{GmM}}{\mathrm{r}^2}=m v^2 / \mathrm{r}$
where $\mathrm{G}$ is the gravitational constant and $\mathrm{v}$ is the orbital velocity. The mass $m$ cancels out and is irrelevant. Thus the orbital velocity is given by
$v^2=\frac{\mathrm{GM}}{\mathrm{r}} \Rightarrow v=\sqrt{\frac{\overline{\mathrm{GM}}}{\mathrm{r}}}$

Topic: Physics, Gravitation, JEE Main
Select the correct statement from the following.

Options:
A Activated sludge-sediment in settlement tanks of the sewage treatment plant is a rich source of anaerobic bacteria.
B Biogas is produced by the activity of aerobic bacteria on animal waste.
C Methanobacterium is an aerobic bacterium found in the rumen of cattle.
D Biogas, commonly called gobar gas, is a mixture of gases mainly composed of methane.

The correct answer is:
Biogas, commonly called gobar gas, is a mixture of gases mainly composed of methane.

Solution:
Biogas is composed of methane, carbon dioxide, hydrogen, nitrogen, and hydrogen sulphide. Of these, methane forms 50-70 %, 30-40 % carbon dioxide, and 10-20 percent includes other components.

Topic: Biology, Microbes in Human Welfare, NEET
Select the correct statement from the ones given below

Options:
A Barbiturates when given to criminals make them tell the truth
B Morphine is often given to persons who have under gone surgery as a pain killer
C Chewing tobacco lowers blood pressure and heart rate
D Cocaine is given to patients after surgery as it stimulates recovery

The correct answer is:
Morphine is often given to persons who have under gone surgery as a pain killer

Solution:
Serturner, a pharmacist isolated the active principle of opium in 1806 and named it morphine. Morphine is a phenanthrene opioid receptor agonist, its main effect is binding to and activating the $\mu$-opioid receptors in the central nervous system. In clinical settings, morphine exerts its principal pharmacological effect on the central nervous system and gastrointestinal tract. Its primary actions of therapeutic value are analgesic and sedation.

Topic: Biology, Human Health and Diseases, NEET, NEET 2010 (Screening)
Select the correct statement regarding the menstrual cycle.

Options:
A A rapid secretion of FSH leads to the rupture of the Graafian follicle and the ovum is released.
B Estrogen secreted by the corpus luteum is necessary for the maintenance of the endometrium.
C During the follicular phase, the primary follicles change into the Graafian follicle, which is transformed into corpus luteum post ovulation.
D All of the above

The correct answer is:
During the follicular phase, the primary follicles change into the Graafian follicle, which is transformed into corpus luteum post ovulation.

Solution:
During the follicular phase, the primary follicles in the ovary grow to become a fully mature Graafian follicle and simultaneously the endometrium of uterus regenerates through proliferation.
Ovulation is followed by the luteal phase where the Graafian follicle is transformed into corpus luteum.
Rapid secretion of LH leading to its maximum level during the mid-cycle called LH surge induces rupture of Graafian follicle, and thereby, the release of the ovum.
The corpus luteum secretes large amounts of progesterone, which is essential for the maintenance of the endometrium.

Topic: Biology, Human Reproduction, NEET
Select the correct statement regarding the tricuspid valve.

Options:
A It has three non-muscular flaps
B It guards the opening between left atrium and left ventricle
C It is an unidirectional valve.
D It is also called the mitral valve.

The correct answer is:
It is an unidirectional valve.

Solution:
It prevents blood from flowing back into the right atrium during contraction of the ventricle.
The tricuspid valve is one of the two main valves on the right side of your heart. Normally, the tricuspid valve has three flaps (leaflets) that open and close, allowing blood to flow from the right atrium to the right ventricle in your heart and preventing blood from flowing backward.

Topic: Biology, Body Fluids and Circulation, NEET
Select the correct statement related to chordates.

A. Presence of a mid-dorsal, solid and double nerve cord.

B. Presence of closed circulatory system.

C. Presence of paired pharyngeal gillislits.

D. Presence of dorsal heart

E. Triploblastic pseudocoelomate animals.

Choose the correct answer from the options given below:

Options:
A B, D and E only
B C, D and E only
C A, C and D only
D B and C only

The correct answer is:
B and C only

Solution:
The main chordate characters are:

Dorsal hollow nerve cord.

Presence of notochord.

Presence of paired pharyngeal gill slits.

Bilateral symmetry with triploblastic, coelomate with organ-system level of organisation.

Presence of post anal tail

Presence of ventral heart, with closed circulatory system.

Topic: Biology, Animal Kingdom, NEET, NEET 2023 (All India)
Select the correct statements.

(1) Ferric bromide is obtained when chlorine gas is bubbled through a solution of ferrous bromide

(2) Sodium sulphate is obtained when SO2g, H2Og and air are passed over heated sodium chlorine

(3) H2S gas is liberated when aluminium sulphide becomes damp.

Options:
A statements 1 and 2 are correct
B statement 3 alone is correct
C statements 2 and 3 are correct
D all the statements are correct

The correct answer is:
statements 2 and 3 are correct

Solution:
(A)  2FeB r 2 +3C l 2 →2FeC l 3 +2B r 2
(B) S O 2 + H 2 O+ 1 2 O 2 → H 2 S O 4 +2HCl
(C)  Al 2 S 3 +6H 2 O→2 Al(OH) 3 +3 H 2 S

Topic: Chemistry, d and f Block Elements, JEE Main
Select the correct statements.
(A) Crystalline solids have long range order.
(B) Crystalline solids are isotropic.
(C) Amorphous solid are sometimes called pseudo solids.
(D) Amorphous solids soften over a range of
temperatures.
(E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.

Options:
A A, B, E only
B (B), (D) only
C (C), (D) only
D (A), (C), (D) only

The correct answer is:
(A), (C), (D) only

Solution:
(A) Crystalline solids have definite arrangement of constituent particles and have long range order.
(C), (D) Different constituent particles of an amorphous solid have different bond strengths and soften over a range of temperatures.

Topic: Chemistry, Solid State, JEE Main, JEE Main 2021 (27 Jul Shift 2)
Select the correct statement(s) about cimetidine andranitidine.

Options:
A These are antihistamine drugs
B These prevent the excess production of HCl inthe stomach
C Both prevent the interaction between histamineand receptor of stomach wall
D All of the above are correct statements

The correct answer is:
All of the above are correct statements

Solution:
A Both are antihistamine drugs.
B and C They prevent the interaction of histamine with the receptors present in the stomach wall and thus lesser HCl is formed.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Select the correct statements here
H3N:+BF3→H3N→BF3

Options:
A Here NH3 is Lewis base while BF3 is Lewis acid
B Hybridisation of BF3 becomes sp3
C Shape of BF3 remains trigonal
D Both A and B

The correct answer is:
Both A and B

Solution:

Topic: Chemistry, Ionic Equilibrium, NEET
Select the CORRECT statements

(I) In Volvox, sexual reproduction involves the fusion of one large, static male gamete and a smaller motile female gamete.
(II) In Spirogyra, fusing gametes are non-flagellated and dissimilar in size.
(III) In Ulothrix, fusing gametes are flagellated and similar in size.
(IV) In Fucus, the female gamete is large and non-motile whereas male gamete is small and motile.

Options:
A I, III
B II, III
C III, IV
D I, II

The correct answer is:
III, IV

Solution:
Algae are the simplest plant group showing a thalloid and autotropism. These group mainly found in water follow various methods of reproduction: sexual, asexual, vegetative. Volvox is a type of colonial algae that follows sexual reproduction. The female gamete in it is large and static whereas the male one is motile and smaller than female gamete. Similar pattern is observed in Fucus. Spirogyra, commonly called the water silk is a type of green algae is called so due to presence of spiral chloroplasts. Spirogyra also, reproduces sexually by fusion of similar sized gametes which donot have any flagella. They are not motile.

Topic: Biology, Plant Kingdom, NEET
Select the correct statements with respect to diseases and immunisation

Options:
A if due to some reason B and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen
B injection of dead/inactivated pathogens causes passive immunity
C certain protozoans have been used to mass produce hepatitis $B$ vaccine
D injection of snake antivenom against snake bite is an example of active immunisation

The correct answer is:
if due to some reason B and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen

Solution:
The primary and secondary immune responses are carried out with the help of two special types of lymphocytes present in our blood, ie, B-lymphocytes and T-lymphocytes. The B-lymphocytes produce an array (a range) of proteins in response to pathogens into our blood to fight with them. These proteins are called antibodies. The T-cells themselves do not secrete antibodies but help B-cells to produce them.

Topic: Biology, Human Health and Diseases, NEET, NEET 2011 (Mains)
Select the correct statements(s).

Options:
A $\mathrm{LiAlH}_{4}$ reduces methyl cyanide to methyl amine
B Alkane nitrile has electrophilic as well as nucleophilic centres
C saponification is a reversible reaction
D Alkaline hydrolysis of methane nitrile forms methanoic acids

The correct answer is:
Alkane nitrile has electrophilic as well as nucleophilic centres

Solution:

Topic: Chemistry, General Organic Chemistry, JEE Main
Select the dimensional formula of B22μ0

Options:
A M1L1T2
B M-1L1T2
C M-1L-1T-2
D M1L-1T-2

The correct answer is:
M1L-1T-2

Solution:
B22μ0=Energy density=EnergyVolume
⇒ ML2T-2L3=ML-1T-2

Topic: Physics, Units and Dimensions, JEE Main
Select the element $(M)$ whose trihalides cannot be hydrolysed to produce an ion of the form $\left[\mathrm{M}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

Options:
A $\mathrm{Al}$
B B
C Ga
D In

The correct answer is:
B

Solution:
Boron trihalides cannot be hydrolysed to produce an ion of the form $\left[\mathrm{B}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ because of absence of $d$ orbitals in boron. The maximum covalence of Boron is 4 .

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main
Select the false statement from the following.

Options:
A Genetic engineering includes techniques to alter chemistry of genetic material (DNA and RNA).
B Sexual reproduction is more advantageous than asexual reproduction.
C Genetic engineering allows us to introduce desirable set of genes without the undesirable gene into the target organism.
D Plasmid is autonomously replicating linear extra chromosomal DNA.

The correct answer is:
Plasmid is autonomously replicating linear extra chromosomal DNA.

Solution:
The plasmid is circular, extra-chromosomal self-replicating DNA present in the bacterial cell. It can replicate independent of the main genome and can form high copy number in the cell.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Select the hormone-releasing Intra-Uterine Devices.

Options:
A Vaults, LNG-20
B Multiload 375, Progestasert
C Progestasert, LNG-20
D Lippes loop, Multiload 375

The correct answer is:
Progestasert, LNG-20

Solution:
INTRAUTERINE DEVICE (IUDs): These are small mechanical devices made up of plastic, copper or stainless steel. They are in the form of loop, coil, T or 7 shaped. IUD is inserted into the uterus of the female by an experienced gynaecologist. It could remain inside the uterus for up to 3 years. IUD prevents implantation of the blastocyst and prevents conception. It is a reliable method of birth control.
There are 3 forms of IUDs:
i) Non-medicated IUDs: These IUDs phagocytes sperms within the uterus. Ex: Lippes loop.
ii) Copper releasing IUDs: These IUDs release copper ions within the uterus which decrease the sperm motility and suppress the fertilizing capacity of sperms. E.g. Copper-T (CuT), Copper-7 (Cu7), multiload 375 etc.
iii) Hormone releasing IUDs: These IUDs release hormones which make the uterus unsuitable for implantation and cervix hostile for sperms. E.g. Progestasert, LNG-20 (levonorgestrel 20).

Topic: Biology, Reproductive Health, NEET, NEET 2019 (All India)
Select the inappropriate pair.

Options:
A Chemosensitive area for respiration - Pons
B GFR - 125 mL/min
C Eustachian tube - Middle ear
D Corpora quadrigemina - Midbrain

The correct answer is:
Chemosensitive area for respiration - Pons

Solution:
Regulation of respiration: The neural system maintains the respiratory rhythm of the body according to the body needs via following parts of the brain :
A. Medulla:
It possesses:
a. Respiratory rhythm centre: It is primarily responsible for the regulation of respiratory rhythm.
b. Chemosensitive area: It is situated adjacent to the Respiratory rhythm centre. Increase in CO2 and H+ concentration â Stimulation of Chemosensitive area â Sends signal to the Respiratory rhythm centre to make necessary changes in the respiratory process for the elimination of these substances.
B. Pons: It possesses pneumotaxic centre that moderates the functions of the respiratory rhythm centre. Stimulation of this centre alters the respiratory rate by reducing the duration of inspiration.

Topic: Biology, Neural Control and Coordination, NEET