datavorous/entrance-exam-dataset huggingface dataset:
Which of the following contributed in popularising the PCR (polymerase chain reactions) technique?

Options:
A Easy availability of DNA template
B Availability of synthetic primers
C Availability of cheap deoxyribonucleotides
D Availability of ‘Thermostable’ DNA polymerase

The correct answer is:
Availability of ‘Thermostable’ DNA polymerase

Solution:
Availability of ‘Thermostable’ DNA polymerase contributed in popularising the PCR (polymerase chain reactions) technique.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Which of the following co-ordination compound has three stereoisomers?

Options:
A [Cd(gly)(H2O)(NH3)]+
B [PbBr2(H2O)2]
C [Cr(en)3]3+
D [CoBr(NO2)(en)2]+

The correct answer is:
[CoBr(NO2)(en)2]+

Solution:
Complexes
Number of stereoisomers

[Cd(gly)(H2O)(NH3)]+
2

[PbBr2(H2O)2]
2

[Cr(en)3]3+
2

[CoBr(NO2)(en)2]+
3

Topic: Chemistry, Coordination Compounds, NEET
Which of the following coordination compounds is used in analytical chemistry?

Options:
A Haemoglobin
B DMG
C cis-platin
D rhodium complex

The correct answer is:
DMG

Solution:
Correct Option is : (B)
DMG

Topic: Chemistry, Coordination Compounds, NEET
Which of the following coordination compounds is used in biological systems?

Options:
A EDTA
B [Au(CN)2]
C Haemoglobin
D DMG

The correct answer is:
Haemoglobin

Solution:
Correct Option is : (C)
Haemoglobin

Topic: Chemistry, Coordination Compounds, NEET
Which of the following coordination compounds is used in medicinal chemistry?

Options:
A cis-platin
B rhodium complex
C Wilkinson catalyst
D [Ag(S2O3)2]3–

The correct answer is:
cis-platin

Solution:
Correct Option is : (A)
cis-platin

Topic: Chemistry, Coordination Compounds, NEET
Which of the following coordination compounds is used in the extraction/metallurgy of metals?

Options:
A Haemoglobin
B [Ag(S2O3)2]3–
C Wilkinson catalyst
D [Au(CN)2]-

The correct answer is:
[Au(CN)2]-

Solution:
Correct Option is : (D)
[Au(CN)2]-

Topic: Chemistry, Coordination Compounds, NEET
Which of the following coordination compounds would exhibit optical isomerism?

Options:
A Pentaamminenitrocobalt(III) iodide
B Diamminedichloroplatinum (II)
C Trans dicyanobis(ethylenediamine) chromium(III) chloride
D Tris-(ethylenediamine) cobalt(III) bromide

The correct answer is:
Tris-(ethylenediamine) cobalt(III) bromide

Solution:
$\left[\operatorname{Co}(\mathrm{en})_3\right]^{3+}$
Related Theory
Optical isomerism occurs when a molecule is not superimposable with its mirror image. Structural isomers have the same chemical composition but the bonds are different.

Topic: Chemistry, Coordination Compounds, NEET, NEET 2004
Which of the following coordination entity absorbs the maximum wavelength of light?

Options:
A [Co(CN)6]3â€“
B [Cu(H2O)4]2+
C [Ti(H2O)6]3+
D [Co(NH3)5(H2O)]3+

The correct answer is:
[Cu(H2O)4]2+

Solution:
Correct Option is : 2
[Cu(H2O)4]2+

Topic: Chemistry, Coordination Compounds, NEET
Which of the following correctly arranges surface tension in increasing order for the given liquids:

Options:
A Water < alcohol < hexane
B Hexane < water < alcohol
C Alcohol < hexane < water
D Hexane < alcohol < water

The correct answer is:
Hexane < water < alcohol

Solution:
Correct Option is : (B)
Hexane < water < alcohol

Topic: Chemistry, States of Matter, NEET
Which of the following correctly balances the equation:

Options:
A 2 I2+ 3 S2O3²⁻ → 2 I⁻ + S4O6²⁻
B I2+ 3 S2O3²⁻ → 2 I⁻ + S4O6²⁻
C I2+ 2S2O3²⁻ → 2 I⁻ + S4O6²⁻
D 3 I2+ S2O3²⁻ → 2 I⁻ + S4O6²⁻

The correct answer is:
I2+ 2S2O3²⁻ → 2 I⁻ + S4O6²⁻

Solution:
Correct Option is : (C)
I2+ 2S2O3²⁻ → 2 I⁻ + S4O6²⁻

Topic: Chemistry, Redox Reactions, NEET
Which of the following correctly balances the equation:

Options:
A 6Fe2++ 14H++ Cr2O72–→ 2Cr3++ 6Fe3++ H2O
B 2Fe2++ 2H++ Cr2O72–→ 2Cr3++ 2Fe3++ H2O
C Fe2++ 2H++ Cr2O72–→ Cr3++ Fe3++ H2O
D Fe2++ H++ Cr2O72–→ 2Cr3++ 2Fe3++ H2O

The correct answer is:
6Fe2++ 14H++ Cr2O72–→ 2Cr3++ 6Fe3++ H2O

Solution:
Correct Option is : (A)
6Fe2++ 14H++ Cr2O72–→ 2Cr3++ 6Fe3++ H2O

Topic: Chemistry, Redox Reactions, NEET
Which of the following correctly calculates the number of molecules of dioxygen (O2) when 1.6 g of dioxygen at STP (273.15K, 1 atm pressure) is transferred to another vessel at constant temperature, where the pressure becomes half of the original pressure?

Options:
A 1.204 × 1023molecules
B 2.408 × 1023molecules
C 3.011 × 1023molecules
D 4.816 × 1023molecules

The correct answer is:
3.011 × 1023molecules

Solution:
Correct Option is : (C)
3.011 × 1023molecules

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Which of the following correctly calculates the potential at point P due to a charge of 4 × 10⁻⁷C located 9 cm away?

Options:
A 4 × 10⁴ V
B 2 × 10⁴ V
C 1 × 10⁴ V
D 5 × 10⁴ V

The correct answer is:
4 × 10⁴ V

Solution:
Correct Option is : (A)
4 × 10⁴ V

Topic: Chemistry, Capacitance, NEET
Which of the following correctly characterizes the plant body of Funaria?

Options:
A Predominantly gametophyte with dependent sporophyte
B Completely gametophyte
C Predominantly sporophyte with dependent gametophyte
D Completely sporophyte

The correct answer is:
Predominantly gametophyte with dependent sporophyte

Solution:
The gametophytic generation represents the dominant phase in the life cycle of bryophytes. The sporophyte phase is dependent on the gametophyte. That is why, the plant body of Funaria is predominantly gametophyte with dependent sporophyte.

Topic: Biology, Plant Kingdom, NEET
Which of the following correctly compares the strength of Coulomb's law for electrostatic force and Newton's law for gravitational force between two stationary point masses, considering their inverse-square dependence on distance?

Options:
A Coulomb's law is stronger than Newton's law.
B Newton's law is stronger than Coulomb's law.
C Coulomb's law and Newton's law have equal strength.
D The strength comparison depends on the specific charges and masses involved.

The correct answer is:
Coulomb's law is stronger than Newton's law.

Solution:
Correct Option is : (A)
Coulomb's law is stronger than Newton's law.

Topic: Chemistry, Electrostatics, NEET
Which of the following correctly completes the reaction: O2+ H2O → ?

Options:
A CO2+ H2
B OH-+ H2O2
C O3+ H2O
D H2O + O3

The correct answer is:
OH-+ H2O2

Solution:
Correct Option is : (B)
OH-+ H2O2

Topic: Chemistry, s Block Elements, NEET
Which of the following correctly defines the components of the Peripheral neural system?

Options:
A Brain + Spinal cord + Somatic neural system
B Somatic neural system + Autonomic neural system
C Spinal cord + Somatic neural system
D Spinal cord + Somatic neural system + Autonomic neural system

The correct answer is:
Somatic neural system + Autonomic neural system

Solution:
The central nervous system (CNS) includes the brain and spinal cord. The peripheral neural system consists of a somatic neural system (cranial nerves and spinal nerves) and an Autonomicneural system (sympathetic and parasympathetic nervous system).

Topic: Biology, Neural Control and Coordination, NEET
Which of the following correctly describes a difference between white and red phosphorus based on their structure and reactivity?

Options:
A White phosphorus is more stable than red phosphorus.
B White phosphorus has a tetrahedral structure, while red phosphorus has a polymeric structure.
C Red phosphorus is more reactive than white phosphorus.
D White phosphorus is amorphous, whereas red phosphorus is crystalline.

The correct answer is:
White phosphorus has a tetrahedral structure, while red phosphorus has a polymeric structure.

Solution:
Correct Option is : (B)
White phosphorus has a tetrahedral structure, while red phosphorus has a polymeric structure.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following correctly describes a hydrogen bond?

Options:
A A hydrogen bond is a chemical bond formed between two hydrogen atoms.
B A hydrogen bond is a type of covalent bond formed between two nonmetals.
C A hydrogen bond is a weak electrostatic attraction between a partially positively charged hydrogen atom and a highly electronegative atom like oxygen, nitrogen, or fluorine in a different molecule.
D A hydrogen bond is a strong chemical bond formed when hydrogen gas reacts with oxygen gas to produce water.

The correct answer is:
A hydrogen bond is a weak electrostatic attraction between a partially positively charged hydrogen atom and a highly electronegative atom like oxygen, nitrogen, or fluorine in a different molecule.

Solution:
Correct Option is : (C)
A hydrogen bond is a weak electrostatic attraction between a partially positively charged hydrogen atom and a highly electronegative atom like oxygen, nitrogen, or fluorine in a different molecule.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following correctly describes the magnitude and direction of the net force acting on a car moving with a constant velocity of 30 km/h on a rough road?

Options:
A The net force is zero, and it acts in the direction of motion.
B The net force is zero, and it acts in the opposite direction of motion.
C The net force is non-zero, and it acts in the direction of motion.
D The net force is non-zero, and it acts in the opposite direction of motion.

The correct answer is:
The net force is zero, and it acts in the direction of motion.

Solution:
Correct Option is : (A)
The net force is zero, and it acts in the direction of motion.

Topic: Chemistry, Laws of Motion, NEET
Which of the following correctly describes the sign of work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket?

Options:
A Positive
B Negative
C Zero
D Cannot be determined

The correct answer is:
Positive

Solution:
Correct Option is : (A)
Positive

Topic: Chemistry, Work Power Energy, NEET
Which of the following correctly describes the sign of work done by an applied force on a body moving on a rough horizontal plane with uniform velocity?

Options:
A Positive
B Negative
C Zero
D Cannot be determined

The correct answer is:
Zero

Solution:
Correct Option is : (C)
Zero

Topic: Chemistry, Work Power Energy, NEET
Which of the following correctly describes the sign of work done by the gravitational force when a person lifts a bucket out of a well using a rope tied to the bucket?

Options:
A Positive
B Negative
C Zero
D It depends on the motion of the bucket.

The correct answer is:
Negative

Solution:
Correct Option is : (B)
Negative

Topic: Chemistry, Work Power Energy, NEET
Which of the following correctly enlists the components of the central neural system?

Options:
A Brain + Spinal cord + Somatic neural system
B Brain + Somatic neural system + Autonomic neural system
C Brain + Spinal cord
D Brain + Spinal cord + Somatic neural system + Autonomic neural system

The correct answer is:
Brain + Spinal cord

Solution:
Central nervous system (CNS) includes brain and spinal cord. Peripheral neural system consists of somatic neural system (cranial nerves and spinal nerves) and Autonomic neural system (sympathetic and parasympathetic nervous system).

Topic: Biology, Neural Control and Coordination, NEET
Which of the following correctly estimates the number of electrons transferred when a polythene piece is rubbed with wool to obtain a negative charge of 3 × 10–7 C?

Options:
A 1.6 × ${{10}^{12}}$ electrons from wool to polythene.
B 3 × ${{10}^{7}}$ electrons from polythene to wool.
C 2 × ${{10}^{12}}$ electrons from wool to polythene.
D 3 × ${{10}^{6}}$ electrons from polythene to wool.

The correct answer is:
2 × ${{10}^{12}}$ electrons from wool to polythene.

Solution:
Correct Option is : (C)
2 × ${{10}^{12}}$ electrons from wool to polythene.

Topic: Chemistry, Electrostatics, NEET
Which of the following correctly explains the absorption of amino acids?

Options:
A Amino acids are mostly absorbed into the blood by active absorption. Small amounts of amino acids are generally absorbed by simple diffusion. Some amino acids are absorbed by facilitated transport.
B Amino acids are mostly absorbed into the blood by active absorption. Small amounts of amino acids are generally absorbed by facilitated transport. Some amino acids are absorbed by simple diffusion.
C Amino acids are mostly absorbed into the blood by simple diffusion. Small amounts of amino acids are generally absorbed by active transport. Some amino acids are absorbed by facilitated transport.
D Amino acids are mostly absorbed into the blood by facilitated transport. Small amounts of amino acids are generally absorbed by active absorption. Some amino acids are absorbed by simple diffusion.

The correct answer is:
Amino acids are mostly absorbed into the blood by active absorption. Small amounts of amino acids are generally absorbed by simple diffusion. Some amino acids are absorbed by facilitated transport.

Solution:
In human gut, various mechanisms are involved for the absorption of the nutrients :
A. Simple diffusion
1. Some amounts of monosaccharides like glucose.
2. Some amounts of amino acids.
3. Few electrolytes like Cl- .
B. Facilitated transport
1. Some glucose.
2. Some amino acids.
C. Active transport -
1. Monosaccharides like glucose (most of the absorption).
2. Most of the amino acids.
3. Electrolytes like Na+ .

Topic: Biology, Digestion and Absorption, NEET
Which of the following correctly explains the difference in reactivity between PbO and PbO2when they react with HCl?

Options:
A PbO2has a higher oxidation state of lead compared to PbO.
B PbO2has a lower molar mass than PbO.
C PbO2has a more compact crystal structure than PbO.
D PbO2has a lower density than PbO.

The correct answer is:
PbO2has a higher oxidation state of lead compared to PbO.

Solution:
Correct Option is : (A)
PbO2has a higher oxidation state of lead compared to PbO.

Topic: Chemistry, Redox Reactions, NEET
Which of the following correctly explains the important aspects of resonance with reference to the CO32−ion?

Options:
A Resonance in the CO32−ion involves the transfer of electrons between carbon and oxygen atoms to achieve a stable electron configuration.
B In the CO32−ion, resonance results in the formation of multiple, distinct Lewis structures that represent the distribution of electrons within the molecule.
C The CO32−ion is incapable of resonance due to its fixed Lewis structure.
D Resonance in the CO32−ion leads to the formation of ionic bonds between carbon and oxygen atoms.

The correct answer is:
In the CO32−ion, resonance results in the formation of multiple, distinct Lewis structures that represent the distribution of electrons within the molecule.

Solution:
Correct Option is : (B)
In the CO32−ion, resonance results in the formation of multiple, distinct Lewis structures that represent the distribution of electrons within the molecule.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following correctly explains the nature of boric acid in aqueous medium?

Options:
A H3BO3→H2OH3+O+H2BO3-
B H3BO3→2H2O2H3+O+HBO32-
C H3BO3→3H2O3H3+O+BO33-
D H 3 BO 3 → H 2 O B(OH) 4 − +  H +

The correct answer is:
H 3 BO 3 → H 2 O B(OH) 4 − +  H +

Solution:
The reaction given below correctly explains weak monobasic Lewis acidic nature of boric acid.
H 3 BO 3  +  H 2 O→ [B(OH) 4 ] −  +  H +
or H 3 BO 3  +  2H 2 O →  [B(OH) 4 ] −  +  H 3 + O

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following correctly explains the paramagnetic behavior of nitric oxide in its gaseous state and its diamagnetic behavior in the solid state?

Options:
A Nitric oxide in the gaseous state has one unpaired electron, while in the solid state, it forms N2O4with no unpaired electrons, making it diamagnetic.
B Nitric oxide is always paramagnetic in both its gaseous and solid states due to its molecular structure.
C Nitric oxide in the solid state has one unpaired electron, while in the gaseous state, it forms N2O4with no unpaired electrons, making it diamagnetic.
D Nitric oxide exhibits paramagnetic behavior in both its gaseous and solid states, regardless of its molecular structure.

The correct answer is:
Nitric oxide in the gaseous state has one unpaired electron, while in the solid state, it forms N2O4with no unpaired electrons, making it diamagnetic.

Solution:
Correct Option is : (A)
Nitric oxide in the gaseous state has one unpaired electron, while in the solid state, it forms N2O4with no unpaired electrons, making it diamagnetic.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following correctly identifies two conjugate acid-base pairs in the ionization of hydrochloric acid in water? HCl(aq) + H2O (l )
H3O+(aq) + Cl–(aq)

Options:
A HCl and H2O
B HCl and H3O+
C H2O and H3O+
D H3O+and Cl–

The correct answer is:
H2O and H3O+

Solution:
Correct Option is : (C)
H2O and H3O+

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following correctly lists the intermolecular forces in water, hexane, and glycerine in increasing order of their viscosities, with a brief reason for the assigned order?

Options:
A Hydrogen bonding in water and glycerine, Dispersion forces in hexane - Hexane < water < glycerine due to weaker forces in hexane and stronger forces in glycerine.
B London forces in water and glycerine, Hydrogen bonding in hexane - Glycerine < water < hexane due to stronger forces in glycerine and weaker forces in hexane.
C Dispersion forces in water and glycerine, Hydrogen bonding in hexane - Hexane < glycerine < water due to stronger forces in glycerine and weaker forces in hexane.
D Hydrogen bonding in water, London forces in hexane, Hydrogen bonding in glycerine - Hexane < water < glycerine due to weaker forces in hexane and stronger forces in glycerine.

The correct answer is:
Hydrogen bonding in water and glycerine, Dispersion forces in hexane - Hexane < water < glycerine due to weaker forces in hexane and stronger forces in glycerine.

Solution:
Correct Option is : (A)
Hydrogen bonding in water and glycerine, Dispersion forces in hexane - Hexane < water < glycerine due to weaker forces in hexane and stronger forces in glycerine.

Topic: Chemistry, States of Matter, NEET
Which of the following correctly related with given diagram?

(i) Sequence of cell cycle = G1− S – G2 − M phase

(ii) A cell exits G1 phase to enter an inactive stage - Quiescent stage or G0

(iii) G1 phase is the interval between mitosis and initiation of DNA replication.

(iv) In G1 phase DNA synthesis occurs.

Options:
A i and ii
B ii, iii and iv
C Only ii
D i, ii and iii

The correct answer is:
i, ii and iii

Solution:
The cell cycle is divided into two basic phases: A. Inter phase B. M Phase (Mitosis phase). The M Phase starts with the nuclear division, corresponding to the separation of daughter chromosomes (karyokinesis) and usually ends with division of cytoplasm (cytokinesis). The inter phase, though called the resting phase, is the time during which the cell is preparing for division by undergoing both cell growth and DNA replication in an orderly manner.

Topic: Biology, Cell Cycle and Cell Division, NEET
Which of the following correctly represent the pyramid of biomass in aquatic ecosystem?

Options:
A I
B II
C III
D IV

The correct answer is:
IV

Solution:
The total biomass of each trophic level can be represented by using a pyramid of biomass. In most ecosystems, the pyramid of biomass is an upright one. But in the aquatic ecosystem, the biomass pyramid is inverted. This is because the primary producers in the aquatic ecosystem are the phytoplanktons. These phytoplanktons are micro organisms and thus have very little biomass as compared to the aquatic animals who consume them and occupy the successive trophic levels in the food chain.

Topic: Biology, Ecosystem, NEET
Which of the following correctly represents the oxidation number of each sulfur atom in the compound Na2S4O6?

Options:
A +3,+2,+2,+3
B +2.5,+2.5,+2.5,+2.5
C +6,0,0,+1
D +5,0,0,+5

The correct answer is:
+5,0,0,+5

Solution:
Correct Option is : (D)
+5,0,0,+5

Topic: Chemistry, Redox Reactions, NEET
Which of the following correlations are incorrect?

Options:
A There are seven free cervical vertebrae and seven pairs of cervical spinal nerves
B There are twelve free thoracic vertebrae and twelve pairs of thoracic spinal nerves
C There are five free lumbar vertebrae and five pairs of lumbar spinal nerves
D There are five fused sacral vertebrae and five pairs of sacral spinal nerves

The correct answer is:
There are seven free cervical vertebrae and seven pairs of cervical spinal nerves

Solution:
In the vertebral column, there are 7 free cervical vertebrae, 12 free thoracic vertebrae, 5 free lumbar vertebrae, 5 sacral vertebrae which are fused to form one bone called the sacrum and 4 coccygeal vertebrae which are fused to form one bone called the coccyx. Thus, there are 33 vertebrae and 26 bones in the vertebral column.
There are 8 pairs of cervical spinal nerves, 12 pairs of thoracic spinal nerves, 5 pairs of lumbar spinal nerves, 5 pairs of sacral spinal nerves and 1 pair of coccygeal spinal nerves. Thus, there are 31 pairs of the spinal nerve and all are mixed.

Topic: Biology, Neural Control and Coordination, NEET
Which of the following could be a restriction enzyme recognition site?

Options:
A ATGCAT
B ATCATC
C AAGGA
D ATCCTA

The correct answer is:
ATGCAT

Solution:
r-DNA technology is a process that uses endonucleases for making transformants. In it, a specific part of DNA sequence is either removed or added. The endonucleases make cut at a specific sequence of the DNA called a recognition site. These sequences are palindromic in nature. Palindromic sequence have the same sequence of base pairs on both strands when read from both the direction â 3ââ5â or 5ââ3â.
The sequence ATGCAT will have the complementary palindromic base sequence as TACGAT.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Which of the following countries has the highest biodiversity?

Options:
A Brazil
B South Africa
C Russia
D India

The correct answer is:
Brazil

Solution:
Brazil has the highest biodiversity because it is located near the equator.

Topic: Biology, Biodiversity and its Conservation, NEET
Which of the following criteria does not pertain to facilitated transport?

Options:
A Requirement of special membrane proteins
B High selectivity
C Transport saturation
D Uphill transport

The correct answer is:
Uphill transport

Solution:
Facilitated transport is a form of passive transport in which materials are moved across the plasma membrane by a transport protein down. Their concentration gradient. It requires integral membrane proteins and highly selective biological membranes to cross.
Saturation occurs in facilitated, diffusion because not enough carriers may be available to handle all the free solute molecules. The rate of movement may reach a maximum. Uphill transport is a process in which diffusion of a component occur's from a less concentrated stream to a more concentrated permeable stream.

Topic: Biology, Transport in Plants, NEET, NEET 2013 (All India)
Which of the following crops have been brought to India from New World?

Options:
A Cashew nut, potato, rubber
B Mango, tea
C Tea, rubber, mango
D Coffee

The correct answer is:
Cashew nut, potato, rubber

Solution:
Cashew nut, potato, rubber are the crops that have been brought to India from New World.

Topic: Biology, Biotechnology and Its Applications, NEET, NEET 2002
Which of the following cry gene codes for a protein which can control the cotton bollworms?

Options:
A cry I Ac
B cry II Ab
C both a and b
D cry I Ab

The correct answer is:
both a and b

Solution:
Specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into the several crop plants such as cotton. The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect-group specific. The toxin is coded by a gene cryIAc named cry. There are a number of them, for example, the proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms that of cryIAb controls corn borer.

Topic: Biology, Biotechnology and Its Applications, NEET