datavorous/entrance-exam-dataset huggingface dataset:
Under what reaction conditions (acidic/basic), the coupling reaction of aryl diazonium chloride with aniline is carried out?

Options:
A Reaction is done in extreme basic conditions.
B Reaction is done in neutral conditions.
C Reaction is done in mild acidic conditions.
D Reaction is done in mild basic conditions.

The correct answer is:
Reaction is done in mild basic conditions.

Solution:
Correct Option is : (D)
Reaction is done in mild basic conditions.

Topic: Chemistry, Amines, NEET
Under which conditions is the reaction of, Preparation of Glucose from sucrose, carried out?

Options:
A Room temperature and high pressure
B 393 K and 2-3 atm pressure
C 473 K and low pressure
D 573 K and 4 atm pressure

The correct answer is:
393 K and 2-3 atm pressure

Solution:
The reaction is carried out at 393 K and 2-3 atm pressure.

Topic: Chemistry, Biomolecules, NEET
Under which conditions van der Waals real gas acts as an ideal gas?

Options:
A High temperature, low pressure
B Low temperature, high pressure
C High temperature, high pressure
D Low temperature, low pressure

The correct answer is:
High temperature, low pressure

Solution:
At high temperature and low pressure real gas acts as an ideal gas and obey $p \mathrm{~V}=n \mathrm{RT}$ relation.
for real gases,
$$
\left(p-\frac{n^2 a}{\mathrm{~V}^2}\right)(\mathrm{V}-n b)=\mathrm{RT}
$$
Van der Waals isotherms demonstrates the relationship between pressure, volume, and temperature based on the van der Waals model. The constants $a$ and $b$ have positive values and are specific to each gas. The higher the value of a, the greater the attraction between molecules and the more easily the gas will compress. The $b$ term represents the excluded volume of the gas or the volume occupied by the gas particles. The van der Waals equation becomes the Ideal Gas Law as these two correction terms approach zero.

Topic: Chemistry, States of Matter, NEET, NEET 2002
Under which of the following category, the given structure of amino acid can be classified?

Options:
A Acidic
B Basic
C Neutral
D None of these

The correct answer is:
Acidic

Solution:
The R group in the given amino acid is hydrogen. The given amino acid is unstable in nature. It will accept electrons to become stable. Thus, it is an acidic amino acid (glutamic acid).

Topic: Chemistry, Biomolecules, NEET
Under which of the following condition, the oxyhaemoglobin dissociation curve shifts to left?

Options:
A High temperature
B High pCO2
C Increase in pH
D Decrease in pH

The correct answer is:
Increase in pH

Solution:
When pH increases, the hydrogen ion concentration decreases, pCO2 decreases and the partial pressure of oxygen increases due to the formation of more oxyhemoglobin. Less hydrogen ion concentration will not be able to alter amino acid residues and will increase affinity to oxygen. An increase in the pH shifts the curve to the left direction. When pH falls, the hydrogen ion concentration becomes high. The dissociation of oxyhemoglobin will start due to which the curve will shift to the right side. This is called the Bohr's effect. An increase in carbon dioxide and temperature shifts the curve to the right.

Topic: Biology, Breathing and Exchange of Gases, NEET
Under which situations can an amorphous substance change to crystalline form?

Options:
A When it is exposed to high temperatures.
B When it undergoes a chemical reaction.
C When it is subjected to extreme pressure.
D Slow heating and cooling over a long period makes an amorphous solid acquire some crystalline character.This is due to crystallisation.

The correct answer is:
Slow heating and cooling over a long period makes an amorphous solid acquire some crystalline character.This is due to crystallisation.

Solution:
Correct Option is : (D)
Slow heating and cooling over a long period makes an amorphous solid acquire some crystalline character.This is due to crystallisation.

Topic: Chemistry, Solid State, NEET
Under which specific conditions can polyacetylene, produced through linear polymerization of ethyne, conduct electricity?

Options:
A High temperature
B High pressure
C Special environmental conditions
D Controlled humidity

The correct answer is:
Special environmental conditions

Solution:
Polyacetylene can conduct electricity under special conditions, often related to its environmental surroundings and doping processes.

Topic: Chemistry, Hydrocarbons, NEET
Unequivocal proof that DNA is the genetic material was first proposed by

Options:
A Wilkins and Franklin
B Frederick Griffith
C Alfred Hershey and Martha Chase
D Avery, Macleod and McCarthy

The correct answer is:
Alfred Hershey and Martha Chase

Solution:
In 1928, Frederick Griffith, a bacteriologist from Britain, in a series of experiments with Streptococcus pneumoniae (bacterium responsible for pneumonia), witnessed miraculous transformation in the bacteria. During the course of his experiment, a living organism (bacteria) had changed in it's physical form.

The unequivocal proof of DNA being the genetic material came from the experiments performed by Alfred Hershey and Martha Chase in the year 1952. They worked with bacteriophages, i.e, the viruses that infect bacteria by using radiolabeled T2 bacteriophages and their and their specific host E.coli cells, they concluded that DNA is the genetic material and not the proteins.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2023 (All India)
Unicellular organism are capable of

Options:
A independent existence
B performing the essential function of life
C well organized organ system
D both a and b

The correct answer is:
both a and b

Solution:
Unicellular organisms are capable of independent existence by performing the essential function of life and without organ and organ system.

Topic: Biology, Cell - The Unit of Life, NEET
Unicellular organisms that divide by binary fission are:

Options:
A Viruses
B Bacteria
C Fungi
D Both (B) and (C)

The correct answer is:
Bacteria

Solution:
Binary fission is a form of asexual reproduction wherein the cell or an organism divides itself into two parts with each part having one copy of the DNA and grow to resemble the original cell. Bacteria are the unicellular organisms which reproduce by this method of cell division, a sit is the only method to reproduce and form duplicate daughter cells. Fungi reproduce by sexual as well as asexual methods of reproduction and the virus replication takes place either through the lysogenic or lytic cycles.

Topic: Biology, Reproduction in Organisms, NEET
Unicellular root hair arises from which part of Dicot root?

Options:
A Pericycle
B Epiblema
C Cortex
D Hypodermis

The correct answer is:
Epiblema

Solution:
The outermost layer is epiblema. Many of the cells of epiblema protrude in the form of unicellular root hairs.

Topic: Biology, Anatomy of Flowering Plants, NEET
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

Options:
A Nerve fibre is insulated by a medullary sheath
B Sodium pump starts operating only at the cyton and then continues into the nerve fibre
C Neurotransmitters are released by dendrites and not by axon endings
D Neurotransmitters are released by the axon endings and not by dendrites

The correct answer is:
Neurotransmitters are released by the axon endings and not by dendrites

Solution:
Transmission of nerve impulses through nerve fibre occurs unidirectionally because axon of one neuron linked to the dendrite of another neuron through the synapse. Synaptic vesicles are filled with a neurotransmitter (e.g., acetylcholine) released by axon endings, not by dendrites.

Topic: Biology, Neural Control and Coordination, NEET
Uniform chain of length L and mass M is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If g is the acceleration due to gravity, the work required to pull the hanging part on to the table is

Options:
A MgL
B MgL3
C MgL9
D MgL18

The correct answer is:
MgL18

Solution:
Mass of hanging portion is M3 (one-third) and centre of mass C, is at a distance h=L6 below the tabletop. Therefore the required work done is,
W=mgh=M3gL6=MgL18

Topic: Physics, Center of Mass Momentum and Collision, NEET
Unisexuality of flowers prevents

Options:
A autogamy, but not geitonogamy.
B both geitonogamy and xenogamy.
C geitonogamy, but not xenogamy.
D autogamy and geitonogamy.

The correct answer is:
autogamy, but not geitonogamy.

Solution:
Pollen grains are transferred from an anther to the stigma of the same flower is called as self-pollination or autogamy. Geitonogamy is the pollination takes place in between the two flowers of the same plant. Geitonogamy is self-pollination because all flowers of the same plant are genetically identical. But functionally or ecologically, is considered as cross pollination. Male and female flowers can be present on the same plant thus unisexuality can prevent the autogamy but it does not ensure the prevention of geitonogamy.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Unisexuality of flowers prevents

Options:
A autogamy, but not geitonogamy
B Both geitonogamy and xenogamy
C geitonogamy, but not xenogamy
D autogamy and geitonogamy

The correct answer is:
autogamy, but not geitonogamy

Solution:
The transfer of pollen from anther to stigma is called pollination. Autogamy also called self-pollination involves the transfer of pollen grains of one flower to the stigma of same flower. Self-pollination occurs only in bisexual or hermaphrodite flowers.
Geitonogamy involves the transfer of pollen grains from a male flower to stigma of female flower of same plant Thus, geitonogamy operates only in monoecious plants, ie, the plants having male and female flowers on different places.
Allogamy or xenogamy also known as cross-pollination involves the transfer of pollen grains of male flower to the stigma of genetically different female flower. It takes place via various agencies like wind, water, insects etc.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2008 (Screening)
Unisexuality of flowers prevents

Options:
A geitonogamy, but not xenogamy.
B autogamy and geitonogamy.
C autogamy, but not geitonogamy.
D both geitonogamy and xenogamy.

The correct answer is:
autogamy, but not geitonogamy.

Solution:
Unisexuality or dicliny is a condition in which two types of unisexual flowers are present i.e., staminate (male flower) and pistillate (female flower). The plant may be monoecious or dioecious. This is a device for cross pollination (or xenogamy). Both xenogamy and geitonogamy (i.e. transfer of pollen from anther of one flower to stigma of another flower of either the same or genetically similar plant). Autogamy or self pollination (i.e. transfer of pollen from anther to stigma of the same flower) occurs in bisexual flower.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Unit of amount of substance is

Options:
A Gram
B

C mole
D Kg

The correct answer is:
mole

Solution:
Correct Option is : 3
mole

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Unit of entropy is:

Options:
A $\mathrm{JK}^{-1} \mathrm{~mol}^{-1}$
B $\mathrm{J} \mathrm{mol}^{-1}$
C $\mathrm{J}^{-1} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$
D $\mathrm{JK} \mathrm{mol}^{-1}$

The correct answer is:
$\mathrm{JK}^{-1} \mathrm{~mol}^{-1}$

Solution:
Entropy is a function of the state of a thermodynamic system. It is extensive quantity, (SI unit: joule/K/ $\mathrm{mol})$.

Topic: Chemistry, Thermodynamics (C), NEET, NEET 2002
Unit of frequency is

Options:
A Hz
B s-1
C Both
D None of the above

The correct answer is:
Both

Solution:
Correct Option is : 3
Both

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Unit of magnetic moment is

Options:
A Ampere− metre 2
B Ampere−metre
C Weber− metre 2
D Weber−metre

The correct answer is:
Ampere− metre 2

Solution:
M = Pole strength × length = amp−metre×metre =amp−metr e 2

Topic: Physics, Units and Dimensions, NEET
Unit of plank constant is

Options:
A J
B J m
C J s
D J Kg

The correct answer is:
J s

Solution:
Correct Option is : 3
J s

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Unit of Stefan's constant is:

Options:
A $\mathrm{Wm}^2 \mathrm{~K}^4$
B $\mathrm{Wm}^2 \mathrm{~K}^{-4}$
C $\mathrm{Wm}^{-2} \mathrm{~K}^{-1}$
D $\mathrm{Wm}^{-2} \mathrm{~K}^{-4}$

The correct answer is:
$\mathrm{Wm}^{-2} \mathrm{~K}^{-4}$

Solution:
Stefan's law is \(E=\sigma\left(T^4\right)\)
\(\begin{aligned}
& \Rightarrow \sigma=\frac{E}{T^4} \\
& \text {where, } E=\frac{\text { Energy }}{\text { Area } \times \text { Time }}=\frac{\text { Watt }}{m^2} \\
& \sigma=\frac{\text { Watt }-m^2}{k^4}=\text { Watt }-m^{-2} k^{-4}
\end{aligned}\)

Topic: Physics, Thermal Properties of Matter, NEET, NEET 2002
Unknown compound A C9H8O5 on methylation with (CH3)2SO4/NaOH forms methyl derivative whose MW is 210. The number of hydroxyl groups in A is

Options:
A five
B four
C one
D three

The correct answer is:
one

Solution:
Number of hydroxyl group =MW of methylether-MW compound 14
=210-19614=1414=1.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Unpolarised light is incident from air on plane surface of a material of refractive index μ. At a particular angle of incident i it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

Options:
A i=sin-1⁡1μ
B Reflected light is polarized with its electric vector perpendicular to the plane of incidence
C Reflected light is polarized with its electric vector parallel to the plane of incident
D i=tan-1⁡1μ

The correct answer is:
Reflected light is polarized with its electric vector perpendicular to the plane of incidence

Solution:
when reflected light rays and reflected rays are perpendicular, reflected light is polarised with electric field vector perpendicular to the plane of incidence.
Also. Brewster's law μ=tani.

Topic: Physics, Wave Optics, NEET, NEET 2018
Unpolarized light of intensity 32 W m-2 passes through three polarizers such that transmission axes of the first and second polarizer make an angle 30Â° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of the final emerging light will be

Options:
A 32 W m-2
B 3 W m-2
C 8 W m-2
D 4 W m-2

The correct answer is:
3 W m-2

Solution:
I0=32
For 1st polaroid
I1=I02
For 2nd polaroid
I2=I1cos2â¡Î¸
I2=I02Ãcos2â¡30Â°
I2=I02Ã34
I2=38I0
As last crosses with 1st polarizer, hence angle between 2nd & last polariser is 60Â°
I3=I2cos2â¡60Â°
I3=I2Ã14
I3=38I0Ã14
I3=3I032
I3=332Ã32
I3=3 W m-2

Topic: Physics, Wave Optics, NEET
Unpolarized light of intensity I0 is incident on surface of a block of glass at Brewster's angle. In that case, which one of the following statements is true?

Options:
A transmitted light is partially polarized with intensity I02
B transmitted light is completely polarized with intensity less than I02
C reflected light is partially polarized with intensity I02
D reflected light is completely polarized with intensity less than I02

The correct answer is:
reflected light is completely polarized with intensity less than I02

Solution:
By polarization due to reflection at polarizing angle reflected light is completely polarized and the intensity is less than average intensity I02

Topic: Physics, Wave Optics, NEET
Unpolarized light of intensity I passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be I2. Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be I8 . The angle between polarizer A and C is

Options:
A 60°
B 0°
C 30°
D 45°

The correct answer is:
45°

Solution:
Transformation axis A and B are parallel If transformation of axis of C is making angle θ with A, it will make angle 90−θ with B
I2cos2θcos2(90−θ)=I8
14sin22θ=14
2θ=π2
θ=π4

Topic: Physics, Wave Optics, NEET
Unpolarized light passes through two polaroids, the axis of one is vertical and that of the other is 30° to the vertical. What is the orientation and intensity of the transmitted light?

Options:
A Plane polarized at 60° to the vertical and having intensity of I04
B Plane polarized at 30° to the vertical and having intensity of 3I08
C Plane polarized at 30° to the vertical and having intensity of I02
D No light passes

The correct answer is:
Plane polarized at 30° to the vertical and having intensity of 3I08

Solution:
The first polaroid alinsisates half the light so that the intensity is reduced by half I′=I02. The light reaching the second polarizer is vertically polarized and so intensity is reduced to
I"=I′cos30°2=34I02
=3I08
Therefore, transmitted light is plane polarised to the vertical at 30° and having intensity 3I08

Topic: Physics, Wave Optics, NEET
Unsaturated fatty acids

Options:
A palmitic acid
B stearic acid
C have high melting point
D have one or more double bond

The correct answer is:
have one or more double bond

Solution:
Fatty acids are of two type saturated and unsaturated fatty acid. Unsaturated fatty acid are liquid at room temperature, have low melting point and have one or more double bonds.

Topic: Chemistry, Biomolecules, NEET
Up to which element did Newlands's Law of Octaves seem to be true?

Options:
A Hydrogen
B Helium
C Carbon
D Calcium

The correct answer is:
Calcium

Solution:
Newlands's Law of Octaves seemed to be true only for elements up to calcium.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Upon exposure to UV radation, DNA stained with ethidium bromide will show:

Options:
A Bright orange colour
B Bright red colour
C Bright blue colour
D Bright yellow colour

The correct answer is:
Bright orange colour

Solution:
Gel electrophoresis is generally done to separate the DNA fragments on Agarose gel. The negatively charged DNA migrate to the positive side when an electric field is applied. The migration depends on the size of the DNA fragment. Smaller DNA move farther as compared to larger fragments. The DNA fragments are stained with EtBr (Ethidium bromide) and exposed to UV-light. This gives bright orange colour to the bands.

Topic: Biology, Biotechnology - Principles and Processes, NEET, NEET 2023 (All India)
Uranium has two isotopes of masses 235 and 238 units. If both are present in Uranium hexafluoride gas which would have the larger average speed ?

Options:
A Smaller mass molecule
B Larger mass molecule
C Both have equal speed
D Cannot be determined

The correct answer is:
Smaller mass molecule

Solution:
Correct Option is : (A)
Smaller mass molecule

Topic: Chemistry, Kinetic Theory of Gases, NEET
Urea can be detected by

Options:
A benedict test.
B molisch test.
C ninhydrine test.
D biuret test.

The correct answer is:
biuret test.

Solution:
When urea is heated it gives the biuret which gives violet colour with CuSO4 and NaOH.

Topic: Chemistry, Amines, NEET
Urea (NH2-CO-NH2) needs to be dissolved in 100g of water, in order to decrease the vapour pressure of water by 25%. What will be the molality of the solution?

Options:
A 18.52 m
B 62.45 m
C 28.52 m
D 35.64 m

The correct answer is:
18.52 m

Solution:
p 0 − p S p 0  =  x Solute
= W Solute M Solute W Solute M Solute + W Solvent M Solvent
P0-PSP0=wAmAÃmBWB (A stands for solute and B for solvent)
x-xÃ75100xÃ75100=w60Ã18100
[Let the vapour pressure of pure water, P0=x ]
0.25x0.75x=w60Ã18100
â´w=111.118
Molality= 111.11 60 Ã 1000 100 =18.52

Topic: Chemistry, Solutions, NEET
Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+aq, deep blue colour solution C is formed. What is the formula of C from the following?

Options:
A CuNH342+
B CuOH2
C CuCO3·CuOH2
D CuSO4

The correct answer is:
CuNH342+

Solution:
NH2CONH2+H2O→CO2+NH4OHA

NH4OH→ΔNH3B+H2O

Cu+2aq+4NH3→CuNH34C+2 (deep blue)

Topic: Chemistry, Coordination Compounds, NEET, NEET 2020 (Phase 1)
Ureides have

Options:
A high N/C ratio
B low N/C ratio
C high NH2/C ratio
D low NH2/C ratio

The correct answer is:
high N/C ratio

Solution:
The process of transfer of amino group from one amino acid to the keto group of a keto acid is called transamination. All the transamination reactions are carried out with the help of catalase enzyme transaminase. Two important amides are asparagines and glutamine and as they contain more nitrogen than amino acids their transportation occurs through the xylem vessels. In certain plants like soyabean the fixed nitrogen is present as ureides which is a derivative of urea and is transported at the same time. These ureides have high nitrogen to carbon ratio.

Topic: Biology, Mineral Nutrition, NEET
Urethral meatus refers to the

Options:
A Urinogenital duct
B Opening of vas deferens into urethra
C External opening of the urinogenital duct
D Muscles surrounding the urinogenial duct

The correct answer is:
External opening of the urinogenital duct

Solution:
The urethra originates from the urinary bladder and extends through the penis to its external opening called urethral meatus (external opening of the urinogenital duct).

Topic: Biology, Human Reproduction, NEET
Uric acid is nitrogenous waste in

Options:
A

Birds and lizards

B

Insects and bony fishs

C

Frog and cartilaginous fishes

D

Mammals and molluscs

The correct answer is:

Birds and lizards

Solution:
The excretion of uric acid is called uricotelism. The excretion of uric acid is advantageous for those animals which have to conserve water for their survival. Reptiles, birds, land snails, and insects excrete nitrogenous wastes as uric acid in the form of the pellet or paste with a minimum loss of water.

Topic: Biology, Excretory Products and their Elimination, NEET
Uric acid is the chief nitrogenous component of the excretory products of

Options:
A $\operatorname{man}$
B earthworm
C cockroach
D frog

The correct answer is:
cockroach

Solution:
Cockroach excretes uric acid as the chief nitrogenous excretory product.
Man excretes urea as the chief nitrogenous excretory product.
Earthworm excretes $40 \%$ urea, $20 \%$ ammonia and $40 \%$ amino acids.
Frog excretes urea as the chief nitrogenous product.

Topic: Biology, Excretory Products and their Elimination, NEET, NEET 2009 (Screening)
Uricotelic mode of passing out nitrogenous wastes is found in

Options:
A birds and annelids
B amphibians and reptiles
C insects and amphibians
D reptiles and birds

The correct answer is:
reptiles and birds

Solution:
Reptile, birds, land snails and insects excrete nitrogenous waste as uric acid in the form of pellet of paste with a minimum loss of water and are called uricotelic animals.

Topic: Biology, Excretory Products and their Elimination, NEET, NEET 2011 (Screening)
Uricotelism is found in:

Options:
A mammals and birds
B fishes and fresh water protozoans
C birds, reptiles and insects
D frogs and toads.

The correct answer is:
birds, reptiles and insects

Solution:
Uricotelism is found in birds, terrestrial reptiles (lizards, snakes), terrestrial insects (formed in Malpighian tubules), snails. Aquatic amphibians, bony fish and aquatic insects exhibit ammonotelism. Marine fish, mammals and terrestrial amphibians exhibit ureotelism.

Topic: Biology, Excretory Products and their Elimination, NEET, NEET 2004
Uricotelism is found in

Options:
A Mammals and birds
B Fishes and fresh water protozoans
C Birds, reptiles and insects
D Frogs and toads

The correct answer is:
Birds, reptiles and insects

Solution:
In uricotelic animals, nitrogenous waste is eliminated in the form of uric acid. Ammonotelism is seen in aquatic animals wherein nitrogenous wastes is eliminated in the form of ammonia eg. Fishes, tadpole. Ureotelism is observed in human beings in which nitrogenous waste is eliminated is urea.

Topic: Biology, Excretory Products and their Elimination, NEET
Uridine, present only in RNA is a:

Options:
A nucleoside
B nucleotide
C purine
D pyrimidine.

The correct answer is:
nucleoside

Solution:
Uridine is a nucleoside, while uracil is a nitrogenase base (pyrimidine).
Uracil + Ribose $\rightarrow$ Uridine
Related Theory
(Ref. to Fig. 14.8)

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2013 (Karnataka)