datavorous/entrance-exam-dataset huggingface dataset:
Who developed the technology of biogas production in India?

Options:
A Indian Agricultural Research Institute (IARI)
B Khadi and Village Industries Commission (KVIC)
C Ministry of Environment and Forests
D Both A) and B)

The correct answer is:
Both A) and B)

Solution:
The technology of biogas production was developed in India mainly due to the efforts of Indian Agricultural Research Institute (IARI) and Khadi and Village Industries Commission (KVIC).

Topic: Biology, Microbes in Human Welfare, NEET
Who were the scientists primarily involved in studying electrical discharge in cathode ray tubes in the mid-1850s?

Options:
A Isaac Newton and Michael Faraday
B Thomas Edison and Nikola Tesla
C Michael Faraday and others
D Albert Einstein and Marie Curie

The correct answer is:
Michael Faraday and others

Solution:
In the mid-1850s, scientists, mainly including Faraday, began to study electrical discharge in cathode ray discharge tubes.

Topic: Chemistry, Structure of Atom, NEET
Whorled, simple leaves with reticulate venation are present in

Options:
A Calotropis
B Neem
C China rose
D Alstonia

The correct answer is:
Alstonia

Solution:
If more than two leaves arise at a node of stem and its branches, and form a whorl, the phyllotaxy is said to be whorled as in Alstonia, Nerium etc. In Alstonia five leaves are present in a whorl while in Nerium three leaves are present in a whorl.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2011 (Mains)
Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a "triplet" ?

Options:
A Beadle and Tatum
B Nirenberg and Mathaei
C Hershey and Chase
D Morgan and Sturtevant

The correct answer is:
Nirenberg and Mathaei

Solution:
No Solution Available

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2009 (Mains)
Whose name is not associated with the development of Periodic Table

Options:
A Prout’s
B Newlands
C Rutherford
D Loother Meyer

The correct answer is:
Rutherford

Solution:
Rutherford

Topic: Chemistry, Classification of Elements and Periodicity in Properties, JEE Main
Why are buffer solutions essential for maintaining the stability of cosmetic products?

Options:
A To alter the product's color
B To control the product's odor
C To ensure the product's safety
D To maintain the product's intended pH

The correct answer is:
To maintain the product's intended pH

Solution:
The paragraph implies that buffer solutions are important in cosmetics to preserve the intended pH of the product.

Topic: Chemistry, Ionic Equilibrium, NEET
Why are competitive inhibitors often used to control bacterial pathogens?

Options:
A To increase the activity of enzymes
B To decrease the activity of enzymes
C To maintain the activity of enzymes
D None of the above

The correct answer is:
To decrease the activity of enzymes

Solution:
Competitive inhibitors are often used in the control of bacterial pathogens because they closely resemble the substrate in their molecular structure and inhibit the activity of the enzyme

Topic: Biology, Biomolecules (B), NEET
Why are elemental dopants for Silicon or Germanium usually chosen from group XIII or group XV?

Options:
A To maintain the crystal structure of the semiconductor without distortion
B To create covalent bonds with Si or Ge
C To ensure easy contribution of charge carriers
D All of the above

The correct answer is:
All of the above

Solution:
Correct Option is : (D)
All of the above

Topic: Chemistry, Semiconductors, NEET
Why are halogens coloured?

Options:

None

Solution:
The halogens are coloured because their molecules absorb light in the visible region. As a result of which their electrons get excited to higher energy levels while the remaining light is transmitted. The color of halogens is the color of this transmitted light.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18)
Why are menstrual cycles absent during pregnancy?

Options:

None

Solution:
The menstrual cycle is the process of breakdown of endometrial lining of the uterus and it comes out through vagina in the form of liquid, formed from blood vessels. It only occurs if the released ovum is not fertilised and also known as weeping of uterus. All events of the menstrual cycle stop during pregnancy and large amounts of progesterone is secreted by corpus luteum, which is essential for the maintenance of the endometrium.

Topic: Biology, Human Reproduction
Why are the 4f- and 5f-inner transition series of elements placed separately in the Periodic Table?

Options:
A To create more space in the table.
B To maintain the periodic table's structure.
C To make the table look symmetrical.
D To separate elements with similar properties.

The correct answer is:
To maintain the periodic table's structure.

Solution:
The 4f- and 5f-inner transition series of elements are placed separately in the Periodic Table to maintain its structure and to preserve the principle of classification by keeping elements with similar properties in a single column.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why are variations important for the process of evolution?

Options:
A To maintain stability
B To preserve the species intact
C To provide new traits and adaptations
D To prevent the loss of genetic diversity

The correct answer is:
To provide new traits and adaptations

Solution:
Variations are important for the process of evolution as they provide new traits and adaptations.

Topic: Biology, Cell Cycle and Cell Division, NEET
Why are vitamin A and vitamin C essential to us? Give their important sources.

Options:
A Vitamin A and vitamin C are not essential to human health.
B Vitamin A is essential for vision and skin health, while vitamin C is necessary for maintaining healthy gums and teeth. Good sources of vitamin A include carrots and sweet potatoes, while vitamin C is found in citrus fruits like oranges and lemons.
C Vitamin A is important for maintaining healthy gums and teeth, while vitamin C is essential for vision and skin health. Good sources of vitamin A include citrus fruits like oranges and lemons, while vitamin C is found in carrots and sweet potatoes.
D Vitamin A is necessary for vision and maintaining healthy gums and teeth, while vitamin C is important for skin health. Good sources of vitamin A include liver and dairy products, while vitamin C is found in fruits like oranges and strawberries.

The correct answer is:
Vitamin A is essential for vision and skin health, while vitamin C is necessary for maintaining healthy gums and teeth. Good sources of vitamin A include carrots and sweet potatoes, while vitamin C is found in citrus fruits like oranges and lemons.

Solution:
Correct Option is : (B)
Vitamin A is essential for vision and skin health, while vitamin C is necessary for maintaining healthy gums and teeth. Good sources of vitamin A include carrots and sweet potatoes, while vitamin C is found in citrus fruits like oranges and lemons.

Topic: Chemistry, Biomolecules, NEET
Why audio signals cannot be transmitted?

Options:
A Because it has more noise
B The length of the transmitting antenna is very small
C The length of the transmitting antenna is very large
D The signal cannot be amplified for distance communication

The correct answer is:
The length of the transmitting antenna is very large

Solution:
Audio signals cannot be transmitted because the length of the transmitting antenna is very large.

Topic: Physics, Communication System, JEE Main
Why do alkenes prefer to undergo electrophilic addition reaction while arenes prefer electrophilic substitution reactions? Explain.

Options:
A Alkenes prefer addition reactions because they lack electron density.
B In arenes during electrophilic addition reaction, aromaticity of the benzene ring is disturbed making them very unstable, while during electrophilic substitution reaction it remains intact.
C Alkenes prefer addition reactions because they are less reactive.
D Arenes prefer substitution reactions because they have a higher degree of unsaturation.

The correct answer is:
In arenes during electrophilic addition reaction, aromaticity of the benzene ring is disturbed making them very unstable, while during electrophilic substitution reaction it remains intact.

Solution:
Correct Option is : (B)
In arenes during electrophilic addition reaction, aromaticity of the benzene ring is disturbed making them very unstable, while during electrophilic substitution reaction it remains intact.

Topic: Chemistry, Hydrocarbons, NEET
Why do isotopes have almost the same chemical properties?

Options:
A They have different electronic configurations.
B They have the same rates of reactions.
C They have the same enthalpy of bond dissociation.
D They have the same physical properties.

The correct answer is:
They have the same enthalpy of bond dissociation.

Solution:
The paragraph mentions that isotopes have almost the same chemical properties because they have the same electronic configuration, and the only difference is in their rates of reactions, mainly due to their different enthalpy of bond dissociation.

Topic: Chemistry, Hydrogen, NEET
Why do many medical and cosmetic formulations require a specific pH?

Options:
A To regulate body temperature.
B To enhance product shelf life.
C To maintain proper hydration.
D To ensure product stability and effectiveness.

The correct answer is:
To ensure product stability and effectiveness.

Solution:
The paragraph states that medical and cosmetic formulations need to be administered at a particular pH, emphasizing the importance of pH in maintaining product stability and effectiveness.

Topic: Chemistry, Ionic Equilibrium, NEET
Why do particles of soil at the bottom of a river remain separated?

Options:
A Equal intermolecular forces
B Surface tension
C High density
D Lack of adhesion

The correct answer is:
Surface tension

Solution:
The separation of particles of soil at the bottom of a river is due to surface tension, a characteristic property of liquids.

Topic: Chemistry, States of Matter, NEET
Why do subshells in a multi-electron atom have different energies?

Options:
A Due to the magnetic quantum number
B Due to the spin quantum number
C Due to the mutual repulsion among electrons
D Due to the attraction between electrons and protons

The correct answer is:
Due to the mutual repulsion among electrons

Solution:
The main reason for different energies of subshells in multi-electron atoms is the mutual repulsion among the electrons.

Topic: Chemistry, Structure of Atom, NEET
Why do you think the zygote is dormant for sometime in a fertilised ovule?

Options:

None

Solution:
The zygote after a period of rest develops into embryo. Most zygotes remain dormant till certain amount of endosperm forms. They do so, to provide assured nutrition to the developing embryo.

Topic: Biology, Sexual Reproduction in Flowering Plants
Why does a wheel in uniform motion about an axis passing through its center and perpendicular to its plane still maintain mechanical equilibrium despite the presence of centripetal acceleration in its constituent particles?

Options:
A The centripetal acceleration arises from the external forces acting on the wheel.
B The internal elastic forces within the wheel cancel each other out, maintaining equilibrium.
C The centripetal acceleration is counteracted by the wheel's rotational velocity.
D The presence of centripetal acceleration does not affect the equilibrium state of the wheel.

The correct answer is:
The internal elastic forces within the wheel cancel each other out, maintaining equilibrium.

Solution:
Correct Option is : (B)
The internal elastic forces within the wheel cancel each other out, maintaining equilibrium.

Topic: Chemistry, Rotational Motion, NEET
Why does air pressure in a car tire increase during driving?

Options:
A Due to the decrease in volume with increasing temperature.
B As a result of the decrease in temperature with constant volume.
C Because of the expansion of the gas under constant temperature.
D Because of the increase in temperature while the volume remains constant.

The correct answer is:
Because of the increase in temperature while the volume remains constant.

Solution:
Correct Option is : (D)
Because of the increase in temperature while the volume remains constant.

Topic: Chemistry, Thermodynamics, NEET
Why does atmospheric pressure at a height of about 6 km decrease to nearly half of its value at sea level, despite the atmosphere's height being more than 100 km?

Options:
A Because air density decreases with increasing altitude, leading to lower atmospheric pressure.
B Due to the presence of ozone layer, which reduces pressure in the upper atmosphere.
C It is a result of the Earth's magnetic field affecting pressure distribution.
D Atmospheric pressure remains constant throughout the atmosphere, and the given statement is incorrect.

The correct answer is:
Because air density decreases with increasing altitude, leading to lower atmospheric pressure.

Solution:
Correct Option is : (A)
Because air density decreases with increasing altitude, leading to lower atmospheric pressure.

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Why does iodine remain in solution when KI is present, forming KI3?

Options:
A Iodine forms a stable complex with KI3.
B KI3 is highly soluble in water.
C Iodine reacts with KI3 to form iodide ions.
D KI3 precipitates as a solid.

The correct answer is:
Iodine forms a stable complex with KI3.

Solution:
Iodine remains in solution when KI is present because it forms a stable complex, KI3, which keeps iodine dissolved.

Topic: Chemistry, Redox Reactions, NEET
Why does the absence of ligands result in a colorless substance in coordination compounds?

Options:
A Ligands cause the substance to be colorless.
B Ligands introduce impurities.
C Ligands induce crystal field splitting.
D Ligands absorb all colors of light.

The correct answer is:
Ligands induce crystal field splitting.

Solution:
In the absence of ligands, crystal field splitting does not occur, and the substance remains colorless.

Topic: Chemistry, Coordination Compounds, NEET
Why does the scrotum help in maintaining the low temperature of the testes?

Options:
A To provide more space for the testes
B To help in respiration
C To help in maintaining the normal internal body temperature
D To help in maintaining the low temperature necessary for spermatogenesis

The correct answer is:
To help in maintaining the low temperature necessary for spermatogenesis

Solution:
The scrotum helps in maintaining the low temperature of the testes (2–2.5 degree Celcius) lower than the normal internal body temperature) necessary for spermatogenesis.

Topic: Biology, Human Reproduction, NEET
Why has the National Forest Commission of India recommended

Options:

None

Solution:
Protection, restoration and conservation forest is our moral duty. Forests are highly beneficial for mankind. Around $30 \%$ of land in India was covered. By forest in early 20 th
century, by the year 2000 , it has been reduced to $18-19 \%$. A relatively large forest cover (67\%) for the hills and $33 \%$ for the plains has been recommended by National Forest Commission of India (1988).
A large forest area for hills helps in checking soil erosion, percolation and recharging ground water, checking landslide and other natural calamities and maintaining the original flora and fauna of the hills.

Topic: Biology, Environmental Issues
Why is alternating current used for measuring resistance of an electrolytic solution?

Options:
A Alternating current is more efficient in heating the solution, making resistance measurements easier.
B Alternating current minimizes the formation of bubbles in the solution, leading to more accurate resistance measurements.
C Alternating current reduces the risk of electrochemical reactions in the solution.
D Alternating current is used to prevent electrolysis so that concentration of ions in the solution remains constant.

The correct answer is:
Alternating current is used to prevent electrolysis so that concentration of ions in the solution remains constant.

Solution:
Correct Option is : (D)
Alternating current is used to prevent electrolysis so that concentration of ions in the solution remains constant.

Topic: Chemistry, Electrochemistry, NEET
Why is apomixis important in the hybrid seed industry?

Options:
A It helps to maintain hybrid characters in the progeny
B It reduces the cost of hybrid seeds for farmers
C Both A) and B)
D None of the above

The correct answer is:
Both A) and B)

Solution:
Apomixis is important in the hybrid seed industry because it helps to maintain hybrid characters in the progeny and reduces the cost of hybrid seeds for farmers.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Why is apple called a false fruit? Which Part(s) of the flower forms the fruit?

Options:

None

Solution:
Botanically ripened ovary is called a true fruit. The fruits in which thalamus and other floral parts develop alongwith the ovaryare called false fruits. For example-apple, strawberry, cashew etc. In apple the main edible portion of the firuit is the fleshy thalamus. Ovary forms the fiuit after fertilization or without fertilization in parthenocarpic fruits.

Topic: Biology, Sexual Reproduction in Flowering Plants
Why is it essential to wash the precipitate with water before estimating it quantitatively?

Options:

None

Solution:
Some amount of the electrolyte are mixed to form the ppt. Some of these electrolytes remains adsorbed on the surface of the particles of the ppt. Hence, it is essential to wash the ppt with water to remove the sticking electrolytes (or any other impurities) before estimating it quantitatively.

Topic: Chemistry, Surface Chemistry
Why is it important for a reversible process to occur infinitely slowly?

Options:
A To save time
B To make it easier to analyze
C To ensure that the process is irreversible
D To allow the system and surroundings to remain in near equilibrium

The correct answer is:
To allow the system and surroundings to remain in near equilibrium

Solution:
A reversible process occurs infinitely slowly to ensure that the system and surroundings are always in near equilibrium with each other.

Topic: Chemistry, Thermodynamics (C), NEET
Why is it necessary for a reversible reaction to reach a minimum free energy at equilibrium?

Options:
A To maximize the entropy change
B To ensure that the reaction occurs at a very high rate
C To allow for the formation of multiple products
D To maintain a stable equilibrium state

The correct answer is:
To maintain a stable equilibrium state

Solution:
In a reversible reaction, the free energy of the system must reach a minimum at equilibrium to maintain a stable equilibrium state. If it is not at a minimum, the system would spontaneously change to a configuration of lower free energy.

Topic: Chemistry, Thermodynamics (C), NEET
Why is it possible for the distribution of speeds of gas particles to remain constant?

Options:
A Because gas particles are uniform in size
B Because gas particles collide in a predictable manner
C Because molecular collisions do not affect particle speeds
D Because even though individual speeds change, the distribution remains the same

The correct answer is:
Because even though individual speeds change, the distribution remains the same

Solution:
The distribution of speeds of gas particles remains constant because, although individual speeds change, the overall distribution does not.

Topic: Chemistry, States of Matter, NEET
Why is knowledge of the enthalpy change important in chemical reactions?

Options:
A To determine the rate of the reaction
B To calculate the equilibrium constant of the reaction
C To plan the heating or cooling required to maintain a constant temperature in industrial reactions
D To measure the volume change of the reactants

The correct answer is:
To plan the heating or cooling required to maintain a constant temperature in industrial reactions

Solution:
Enthalpy change is important in chemical reactions to plan the heating or cooling needed to maintain a constant temperature in industrial processes and to understand the temperature dependence of equilibrium constants.

Topic: Chemistry, Thermodynamics (C), NEET
Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

Options:
A Nitric acid is added to decompose NaCN to HCN and Na2S to H2S and to expel these gases. That is, if any nitrogen and sulphur are present in the form of NaCN and Na2S, then they are removed and only halogens are available for testing.
B Nitric acid is added to increase the pH of the solution, which enhances the solubility of halide precipitates formed with silver nitrate.
C Nitric acid is added to react with any remaining halogens in the sodium extract, converting them to soluble nitrate salts, making it easier to detect the presence of halogens using silver nitrate.
D Nitric acid is added to react with silver nitrate, forming a complex that improves the sensitivity of the test for halogens.

The correct answer is:
Nitric acid is added to decompose NaCN to HCN and Na2S to H2S and to expel these gases. That is, if any nitrogen and sulphur are present in the form of NaCN and Na2S, then they are removed and only halogens are available for testing.

Solution:
Correct Option is : (A)
Nitric acid is added to decompose NaCN to HCN and Na2S to H2S and to expel these gases. That is, if any nitrogen and sulphur are present in the form of NaCN and Na2S, then they are removed and only halogens are available for testing.

Topic: Chemistry, General Organic Chemistry, NEET
Why is ortho hydroxybenzoic acid the main reaction product in the reaction between the phenoxide ion and carbon dioxide?

Options:
A It has a higher melting point.
B It is the most stable isomer.
C It has a stronger odour.
D It is formed via resonance stabilisation.

The correct answer is:
It is formed via resonance stabilisation.

Solution:
Ortho hydroxybenzoic acid is the main product because it is formed through resonance stabilisation, making it more favourable than other possible isomers.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is partial roasting of sulphide ore done in metallurgy of copper?

Options:
A Auto reduction of CuO formed is carried out by remaining CuS in the reaction
B Cu is separated out by partial reduction due to sedimentation
C Due to difference in gravity CuO and CuS are separated
D Complete roasting cannot be done in one step hence partial roasting is done

The correct answer is:
Auto reduction of CuO formed is carried out by remaining CuS in the reaction

Solution:
Partial roasting of sulphide ore forms metal oxide.
This oxide then reduces the remaining sulphide ore into metal.
2Cu2S+3O2→2Cu2O+2SO2
2Cu2O+Cu2S→6Cu+SO2
This process is called autoreduction.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Why is some amount of urea retained in the kidney matrix of some ureotelic animals?

Options:
A To regulate the excretion of nitrogenous waste
B To maintain the balance of fluids in the body
C To maintain a desired osmolarity
D To improve the function of the kidneys

The correct answer is:
To maintain a desired osmolarity

Solution:
Some amount of urea is retained in the kidney matrix of some ureotelic animals to maintain a desired osmolarity.

Topic: Biology, Excretory Products and their Elimination, NEET
Why is the catalyst effective even in small quantities according to the modern adsorption theory?

Options:
A It reacts with the reactants
B It diffuses into the bulk of the reactants
C It provides free valencies
D It remains unchanged in mass and composition

The correct answer is:
It remains unchanged in mass and composition

Solution:
The paragraph notes that the catalyst remains unchanged in mass and chemical composition at the end of the reaction and is effective even in small quantities.

Topic: Chemistry, Surface Chemistry, NEET