datavorous/entrance-exam-dataset huggingface dataset:
What is the role of concentrated sulfuric acid in the Brown Ring Test?

Options:
A To dilute the solution
B To react with ferrous ions (Fe2+)
C To dissolve nitrate ions
D To create an interface between the solution and sulfuric acid layers

The correct answer is:
To create an interface between the solution and sulfuric acid layers

Solution:
The paragraph mentions that in the Brown Ring Test, concentrated sulfuric acid is added to create an interface between the solution and sulfuric acid layers, and the presence of a brown ring at this interface indicates the presence of nitrate ions.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the role of concentrated sulfuric acid in the nitration of benzene?

Options:
A It provides nitrogen for nitration.
B It acts as a catalyst.
C It prevents over-nitration.
D It acts as a reducing agent.

The correct answer is:
It prevents over-nitration.

Solution:
Concentrated sulfuric acid serves as a catalyst and also prevents over-nitration by absorbing any excess water that may be produced during the reaction, which could lead to the formation of undesirable by-products.

Topic: Chemistry, Hydrocarbons, NEET
What is the role of coordination compounds in the treatment of lead poisoning?

Options:
A They are used to remove excess iron.
B They are used to remove excess copper.
C They are used to remove excess lead.
D They are used to remove excess nickel.

The correct answer is:
They are used to remove excess lead.

Solution:
Coordination compounds are used in the treatment of lead poisoning to remove excess lead.

Topic: Chemistry, Coordination Compounds, NEET
What is the role of copper in the synthesis of silicones?

Options:
A Copper is a catalyst that enhances the water-repelling properties of silicones.
B Copper is a reactant in the synthesis of silicones.
C Copper is an insulator used in electrical applications of silicones.
D Copper is a byproduct of the silicone manufacturing process.

The correct answer is:
Copper is a catalyst that enhances the water-repelling properties of silicones.

Solution:
Copper is used as a catalyst in the reaction of methyl chloride with silicon.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
What is the role of counter ions in a coordination compound?

Options:
A They form the coordination sphere
B They are responsible for the color of the complex
C They balance the charge of the complex ion
D They coordinate with the ligands

The correct answer is:
They balance the charge of the complex ion

Solution:
Counter ions in a coordination compound balance the charge of the complex ion.

Topic: Chemistry, Coordination Compounds, NEET
What is the role of Cu(II) ions in the iodometry reaction?

Options:
A Cu(II) ions reduce iodine to iodide ions.
B Cu(II) ions oxidize iodide ions to iodine.
C Cu(II) ions complex with iodine to form Cu2I2.
D Cu(II) ions precipitate with iodine.

The correct answer is:
Cu(II) ions oxidize iodide ions to iodine.

Solution:
Cu(II) ions act as an oxidizing agent, converting iodide ions (I-) to iodine (I2) in the reaction.

Topic: Chemistry, Redox Reactions, NEET
What is the role of cyanobacteria in biofertilisers?

Options:
A Fixing atmospheric nitrogen
B Adding organic matter to soil
C Replenishing soil nutrients
D All of the above

The correct answer is:
All of the above

Solution:
Cyanobacteria are widely distributed in aquatic and terrestrial environments, many of which can fix atmospheric nitrogen. They serve as an important biofertiliser in paddy fields and add organic matter to the soil, increasing its fertility.

Topic: Biology, Microbes in Human Welfare, NEET
What is the role of cytochromes in the photosynthesis process?

Options:
A Transfer electrons from photosystem PS I to NADP⁺
B Absorb red light of 700 nm wavelength
C Transport electrons from the reaction center of PS II
D Reduce NADP⁺ to NADPH + H⁺

The correct answer is:
Transport electrons from the reaction center of PS II

Solution:
The excited electrons from the reaction center of PS II are picked up by an electron acceptor and passed on to an electron transport system consisting of cytochromes.

Topic: Biology, Photosynthesis in Higher Plants, NEET
What is the role of desorption in the process of catalysis?

Options:
A Desorption is the step where the reactants are adsorbed onto the catalyst surface.
B Desorption helps to remove the product molecules from the catalyst surface, allowing new reactants to come in contact with the active sites.
C Desorption increases the temperature of the system, facilitating the reaction.
D Desorption is not relevant in catalysis.

The correct answer is:
Desorption helps to remove the product molecules from the catalyst surface, allowing new reactants to come in contact with the active sites.

Solution:
Correct Option is : (B)
Desorption helps to remove the product molecules from the catalyst surface, allowing new reactants to come in contact with the active sites.

Topic: Chemistry, Surface Chemistry, NEET
What is the role of diffusion in heterogeneous catalysis?

Options:
A Diffusion ensures even distribution of catalyst particles.
B Diffusion prevents the reactants from reaching the catalyst.
C Diffusion promotes adsorption of reactants on the catalyst.
D Diffusion generates heat required for the catalytic reaction.

The correct answer is:
Diffusion ensures even distribution of catalyst particles.

Solution:
Correct Option is : (A)
Diffusion ensures even distribution of catalyst particles.

Topic: Chemistry, Surface Chemistry, NEET
What is the role of dilute alkali in the Aldol condensation reaction?

Options:
A To act as a reducing agent
B To act as a catalyst
C To act as an oxidizing agent
D To act as a solvent

The correct answer is:
To act as a catalyst

Solution:
Dilute alkali serves as a catalyst in the Aldol condensation reaction.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
What is the role of dilute hydrochloric acid in the preparation of dihydrogen?

Options:
A It acts as a catalyst.
B It provides oxygen gas.
C It provides hydrogen ions.
D It provides water vapor.

The correct answer is:
It provides hydrogen ions.

Solution:
Dilute hydrochloric acid provides hydrogen ions in the preparation of dihydrogen by reacting with zinc.

Topic: Chemistry, Hydrogen, NEET
What is the role of DNA fingerprinting in forensic science?

Options:
A Determining population and genetic diversities
B Identifying differences in specific regions of DNA sequences
C Identifying individuals based on DNA profiles
D Amplifying DNA from a single cell

The correct answer is:
Identifying individuals based on DNA profiles

Solution:
DNA fingerprinting is a useful identification tool in forensic science as DNA from every tissue from an individual shows the same degree of polymorphism and can be used to identify individuals based on their DNA profiles.

Topic: Biology, Molecular Basis of Inheritance, NEET
What is the role of DNA ligase in genetic engineering?

Options:
A To join DNA fragments together
B To cut DNA into single stranded portions
C To form recombinant molecules of DNA
D None of the above

The correct answer is:
To join DNA fragments together

Solution:
The DNA ligase is used to join DNA fragments together.

Topic: Biology, Biotechnology - Principles and Processes, NEET
What is the role of DNA ligase in the process of replication?

Options:
A to initiate replication
B to join discontinuously synthesized fragments
C to provide the origin of replication
D none of the above

The correct answer is:
to join discontinuously synthesized fragments

Solution:
The discontinuously synthesized fragments on one strand of the DNA during replication are later joined by the enzyme DNA ligase.

Topic: Biology, Molecular Basis of Inheritance, NEET
What is the role of DNA polymerase enzyme in the replication of recombinant DNA?

Options:
A It acts as a mechanism to transfer a piece of DNA into a host organism
B It acts as a vector to deliver an alien piece of DNA into the host organism
C It makes multiple copies of the recombinant DNA
D It acts as a type of bacterium

The correct answer is:
It makes multiple copies of the recombinant DNA

Solution:
The role of the DNA polymerase enzyme in the replication of recombinant DNA is to make multiple copies.

Topic: Biology, Biotechnology - Principles and Processes, NEET
What is the role of electron holes in the conduction of electricity in a p-type semiconductor?

Options:
A Electron holes carry the electric current.
B Electron holes block the flow of electric current.
C Electron holes generate electric current.
D Electron holes are not involved in electric conduction.

The correct answer is:
Electron holes carry the electric current.

Solution:
Electron holes in a p-type semiconductor carry the electric current.

Topic: Chemistry, Solid State, NEET
What is the role of electron transport chain in photosynthesis?

Options:
A To circulate the electron within photosystem I
B To provide electrons to replace those removed from photosystem I
C To cause the proton gradient across the thylakoid membrane
D To synthesize ATP from ADP and inorganic phosphate

The correct answer is:
To provide electrons to replace those removed from photosystem I

Solution:
Electrons in photosystem I are replaced by electrons provided by photosystem II through the electron transport chain.

Topic: Biology, Photosynthesis in Higher Plants, NEET
What is the role of electron transport system in cellular respiration in plants?

Options:
A To transport electrons
B To synthesize ATP
C To store energy
D To release energy

The correct answer is:
To synthesize ATP

Solution:
The energy in NADH + H⁺ and FADH₂ generated in the Krebs’ cycle is used to synthesize ATP through a system of electron carriers called electron transport system (ETS) located on the inner membrane of the mitochondria.

Topic: Biology, Respiration in Plants, NEET
What is the role of electrophiles in organic reactions?

Options:
A They bring an electron pair to the reactive site.
B They take away an electron pair from the reactive site.
C They stabilize carbanions.
D They supply lone pair electrons.

The correct answer is:
They take away an electron pair from the reactive site.

Solution:
The paragraph describes electrophiles as reagents that take away an electron pair from the reactive site of the substrate.

Topic: Chemistry, General Organic Chemistry, NEET
What is the role of embryo transfer (ET) in the test tube baby programme?

Options:
A Collection of ova and sperms
B Formation of zygote
C Transfer of embryos into the uterus or fallopian tube
D None of the above

The correct answer is:
Transfer of embryos into the uterus or fallopian tube

Solution:
In the test tube baby programme, after the formation of zygote or early embryos, the embryo transfer (ET) is performed, where the embryos are transferred into the uterus or fallopian tube.

Topic: Biology, Reproductive Health, NEET
What is the role of enterokinase in the small intestine?

Options:
A To activate trypsinogen
B To digest carbohydrates
C To digest nucleic acids
D To emulsify fats

The correct answer is:
To activate trypsinogen

Solution:
Enterokinase is an enzyme secreted by the intestinal mucosa that activates trypsinogen, which is an inactive enzyme present in the pancreatic juice, converting it into the active enzyme trypsin. Trypsin then activates other enzymes in the pancreatic juice, such as chymotrypsinogen and procarboxypeptidases, to aid in the digestion of proteins.

Topic: Biology, Digestion and Absorption, NEET
What is the role of enzymes in respiration?

Options:
A To release energy directly into the cell
B To synthesize ATP
C To control the series of slow step-wise reactions
D To act as respiratory substrates

The correct answer is:
To control the series of slow step-wise reactions

Solution:
Enzymes play a role in controlling the series of slow step-wise reactions during respiration, leading to the release of energy.

Topic: Biology, Respiration in Plants, NEET
What is the role of exchange energy in determining ionization enthalpy?

Options:
A It increases ionization enthalpy
B It decreases ionization enthalpy
C It has no effect on ionization enthalpy
D It stabilizes the energy state

The correct answer is:
It stabilizes the energy state

Solution:
Exchange energy is responsible for the stabilization of energy state.

Topic: Chemistry, d and f Block Elements, NEET
What is the role of external intercostal muscles in inspiration?

Options:
A They contract and lift up the ribs and sternum
B They relax and push down the ribs and sternum
C They contract and push down the ribs and sternum
D They relax and lift up the ribs and sternum

The correct answer is:
They contract and lift up the ribs and sternum

Solution:
The contraction of external intercostal muscles lifts up the ribs and the sternum causing an increase in the volume of the thoracic chamber in the dorso-ventral axis.

Topic: Biology, Breathing and Exchange of Gases, NEET
What is the role of extrinsic factors in initiation of flowering?

Options:
A They have no role in initiation of flowering
B They play a complementary role in initiation of flowering
C They play an antagonist role in initiation of flowering
D They play a crucial role in initiation of flowering

The correct answer is:
They play a crucial role in initiation of flowering

Solution:
We shall discuss briefly the role of light and temperature (both of them, the extrinsic factors) on initiation of flowering.

Topic: Biology, Plant - Growth and Development, NEET
What is the role of extrinsic factors in the developmental processes of a plant?

Options:
A Controls growth and differentiation
B No role
C Influences seed germination
D Regulates metabolic activities

The correct answer is:
Influences seed germination

Solution:
Extrinsic factors, which are external to the plant, play a role in the developmental processes of a plant by influencing seed germination.

Topic: Biology, Plant - Growth and Development, NEET
What is the role of F₁ component in ATP synthase (complex V)?

Options:
A It forms the channel through which protons cross the inner membrane
B It contains the site for oxidation of NADH
C It contains the site for synthesis of ATP from ADP and inorganic phosphate
D It forms the channel for transport of electrons from one carrier to another

The correct answer is:
It contains the site for synthesis of ATP from ADP and inorganic phosphate

Solution:
The F₁ component of ATP synthase (complex V) is a peripheral membrane protein complex and contains the site for synthesis of ATP from ADP and inorganic phosphate.

Topic: Biology, Respiration in Plants, NEET
What is the role of filiform apparatus in the embryo sac?

Options:
A To form the egg apparatus
B To guide the pollen tubes into the egg cell
C To group the cells at the micropylar end
D To group the cells at the chalazal end

The correct answer is:
To guide the pollen tubes into the egg cell

Solution:
The synergids in the egg apparatus have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
What is the role of flux in metallurgical processes?

Options:
A Fluxes act as reducing agents to convert metal ores into pure metals.
B Flux is used for making the molten mass more conducting.
C Fluxes increase the melting point of metal ores, making them easier to handle.
D Fluxes prevent the formation of slag during the smelting process.

The correct answer is:
Flux is used for making the molten mass more conducting.

Solution:
Correct Option is : (B)
Flux is used for making the molten mass more conducting.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
What is the role of friends in preventing substance abuse among adolescents?

Options:
A They have no role to play.
B They have a minor role to play.
C They have a significant role to play.
D They have a limited role to play.

The correct answer is:
They have a significant role to play.

Solution:
If friends find someone using drugs or alcohol, they should not hesitate to bring it to the notice of parents or teachers in the best interests of the person concerned.

Topic: Biology, Human Health and Diseases, NEET
What is the role of froth stabilisers in the froth flotation method?

Options:
A To increase wettability of mineral particles
B To enhance non-wettability of mineral particles
C To dissolve the ore particles
D To stabilize the froth

The correct answer is:
To stabilize the froth

Solution:
Froth stabilisers, like cresols and aniline, are added to stabilize the froth formed during the froth flotation process.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
What is the role of FSH in the process of spermatogenesis?

Options:
A Stimulate the synthesis and secretion of androgens
B Acts on the Sertoli cells
C Stimulate secretion of factors which help in the process of spermiogenesis
D None of the above

The correct answer is:
Acts on the Sertoli cells

Solution:
FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis.

Topic: Biology, Human Reproduction, NEET
What is the role of fuming nitric acid in the Carius method?

Options:
A It absorbs carbon dioxide
B It oxidizes carbon and hydrogen
C It forms silver halide
D It is used to wash the compound

The correct answer is:
It oxidizes carbon and hydrogen

Solution:
In the Carius method, fuming nitric acid is used to oxidize carbon and hydrogen in the organic compound.

Topic: Chemistry, General Organic Chemistry, NEET
What is the role of fuming sulphuric acid (oleum) in sulphonation?

Options:
A Catalyst
B Solvent
C Oxidizing agent
D Dehydrating agent

The correct answer is:
Dehydrating agent

Solution:
Fuming sulphuric acid (oleum) acts as a dehydrating agent in the sulphonation process, facilitating the replacement of a hydrogen atom with a sulphonic acid group.

Topic: Chemistry, Hydrocarbons, NEET
What is the role of fungi in causing disease?

Options:
A They are responsible for causing diseases in plants and animals
B They are the source of antibiotics
C They prevent food from going bad
D They cause white spots on mustard leaves

The correct answer is:
They are responsible for causing diseases in plants and animals

Solution:
Some fungi cause diseases in plants and animals; wheat rust-causing Puccinia is an important example.

Topic: Biology, Biological Classification, NEET
What is the role of β-galactosidase gene in recombinant DNA cloning?

Options:
A To produce blue color
B To differentiate recombinants
C To simplify selection
D To inactivate gene for synthesis of enzyme

The correct answer is:
To inactivate gene for synthesis of enzyme

Solution:
In recombinant DNA cloning, a recombinant DNA is inserted within the coding sequence of an enzyme, β-galactosidase, which results into inactivation of the gene for synthesis of this enzyme.

Topic: Biology, Biotechnology - Principles and Processes, NEET
What is the role of Gambusia in preventing the spread of mosquito-borne diseases?

Options:
A It is a type of insecticide
B It is a type of vegetable
C It is a type of fish that feeds on mosquito larvae
D It is a type of fruit

The correct answer is:
It is a type of fish that feeds on mosquito larvae

Solution:
Gambusia is a type of fish that feeds on mosquito larvae and can be introduced in ponds to prevent the spread of mosquito-borne diseases like malaria and filariasis.

Topic: Biology, Human Health and Diseases, NEET
What is the role of germ pore in pollen grain?

Options:
A Emergence of pollen tube
B Emergence of plumule
C Emergence of radical
D Emergence of hypocotyls

The correct answer is:
Emergence of pollen tube

Solution:
Germ pore is that region on pollen grain which lacks exine and only contains thin intine. During pollen germination pollen grain absorbs water and intine emerges out through germ pore-forming pollen tube.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
What is the role of gibberellins in sugarcane crops?

Options:
A Increases stem length
B Decreases stem length
C Promotes flowering
D Decreases yield

The correct answer is:
Increases stem length

Solution:
Spraying sugarcane crops with gibberellins increases the length of the stem, thus increasing the yield by as much as 20 tonnes per acre.

Topic: Biology, Plant - Growth and Development, NEET
What is the role of GnRH in the endocrine system?

Options:
A Stimulation of pituitary synthesis and release of gonadotrophins
B Inhibition of the release of growth hormone from the pituitary
C Regulation of anterior pituitary
D None of the above

The correct answer is:
Stimulation of pituitary synthesis and release of gonadotrophins

Solution:
The hypothalamic hormone called Gonadotrophin releasing hormone (GnRH) stimulates the pituitary synthesis and release of gonadotrophins.

Topic: Biology, Chemical Coordination and Integration, NEET
What is the role of GnRH in the regulation of pituitary hormone synthesis and secretion?

Options:
A It stimulates the release of gonadotrophins
B It inhibits the release of gonadotrophins
C It stimulates the release of growth hormone
D It inhibits the release of growth hormone

The correct answer is:
It stimulates the release of gonadotrophins

Solution:
A hypothalamic hormone called Gonadotrophin r

Topic: Biology, Chemical Coordination and Integration, NEET
What is the role of gypsum, CaSO4.2H2O in setting of cement? Identify the correct option from the following:

Options:
A to fasten the setting process
B to provide water molecules for hydration process
C to help to remove water molecules
D to slow down the setting process

The correct answer is:
to slow down the setting process

Solution:
The purpose of adding gypsum is only to slow down the process of setting of cement so that it gets sufficiently hardened

Topic: Chemistry, s Block Elements, NEET, NEET 2020 (Phase 2)
What is the role of haem in peroxidase and catalase?

Options:
A To make the enzyme catalytically active.
B To tightly bind to the apoenzyme.
C To catalyze the breakdown of hydrogen peroxide.
D To be a part of the active site of the enzyme.

The correct answer is:
To be a part of the active site of the enzyme.

Solution:
Haem is the prosthetic group in peroxidase and catalase and it is a part of the active site of the enzyme, which catalyzes the breakdown of hydrogen peroxide to water and oxygen.

Topic: Biology, Biomolecules (B), NEET
What is the role of HCl in the stomach?

Options:
A To neutralize the acidity of food
B To aid in the digestion of food
C To absorb Vitamin B₁₂
D To produce enzymes

The correct answer is:
To aid in the digestion of food

Solution:
Hydrochloric acid (HCl) is an acidic solution that helps in the digestion of food by breaking down proteins into peptides. It also provides an acidic environment in the stomach that kills harmful bacteria that may have entered the body through food.

Topic: Biology, Digestion and Absorption, NEET
What is the role of HCl in the stomach?

Options:
A To neutralize the acidity of food
B To aid in the digestion of food
C To absorb Vitamin B₁₂
D To produce enzymes

The correct answer is:
To aid in the digestion of food

Solution:
Parietal or oxyntic cells in gastric glands secrete HCl. HCl is an acidic solution that helps in the digestion of food by breaking down proteins into peptides. It also provides an acidic environment in the stomach that kills harmful bacteria that may have entered the body through food.

Topic: Biology, Digestion and Absorption, NEET
What is the role of heated copper in the dehydrogenation of alcohols?

Options:
A To act as a reducing agent
B To act as a catalyst
C To neutralise the reaction mixture
D To form carboxylic acids

The correct answer is:
To act as a catalyst

Solution:
Heated copper acts as a catalyst in the dehydrogenation of alcohols.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
What is the role of hexanedioic acid in the manufacture of nylon-6, 6?

Options:
A Solvent
B Dyeing agent
C Monomer
D Food preservative

The correct answer is:
Monomer

Solution:
Hexanedioic acid serves as a monomer in the manufacture of nylon-6, 6.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET