datavorous/entrance-exam-dataset huggingface dataset:
Absence of circulatory system in Hydra is compensated by

Options:
A pseudocoelomic fluid
B gastrovascular cavity
C presence of tentacles
D None of these

The correct answer is:
gastrovascular cavity

Solution:
Hydra is relatives of corals and jellyfish. All these species are members of the phylum Cnidaria characterized by symmetrical bodies crowned by 10-12 tentacles and an opening called a gastrovascular cavity. This class of organisms don't have a specialized circulatory system. They have a thin layer of cells which when coming in contact with water absorb the nutrients and oxygen required by the body.

Topic: Biology, Animal Kingdom, NEET
Absence of sperms in semen is called

Options:
A Oligospermia
B polyspermia
C azoospermia
D asthenospermia

The correct answer is:
azoospermia

Solution:
Oligospermia means less number of sperms per ejaculate. Polyspermia means a large number of sperms than normal per ejaculate. Asthenospermia is a reduced motility of sperms. Azoospermia means the complete absence of sperms in semen.

Topic: Biology, Human Reproduction, NEET
Absolute growth rate can be best defined as

Options:
A It is growth rate in whole life.
B It is growth from birth to death.
C Measurement and the comparison of total growth rate per unit time.
D Per unit initial parameters

The correct answer is:
Measurement and the comparison of total growth rate per unit time.

Solution:
Quantitative comparisons between the growth of living system can also be made in two ways : (i) measurement and the comparison of total growth per unit time is called the absolute growth rate. (ii) The growth of the given system per unit time expressed on a common basis, e.g., per unit initial parameter is called the relative growth rate.

Topic: Biology, Plant - Growth and Development, NEET
Absorption of water by plants is enhanced by

Options:
A Increasing photosynthesis
B Increasing transpiration
C Decreasing transpiration
D Decreasing salt absorption

The correct answer is:
Increasing transpiration

Solution:
Loss of water due to transpiration in leaves exerts a pull in vertical water column present in xylem; this is known as transpiration pull. Absorption of water and ascent of sap in plants occurs due to transpiration pull; thus, higher rate of transpiration increases absorption of water by plants.

Topic: Biology, Transport in Plants, NEET
Acceleration due to gravity at earth's surface is 10 m s-2. The value of acceleration due to gravity at the surface of a planet of mass 15 th and radius 12 of the earth is -

Options:
A 4 m s-2
B 6 m s-2
C 8 m s-2
D 12 m s-2

The correct answer is:
8 m s-2

Solution:
gp=GMpRP2
Mp=mass of planet
Rp=radius of planet
gp=Acceleration due to gravity on planet
g p = G( M e 5 ) ( R e 2 ) 2
=GÃ15ÃMeÃ4Re2
=45g=8 m s-2

Topic: Physics, Gravitation, NEET
Acceleration due to gravity is g on the surface of the earth. The value of acceleration due to gravity at a height of 32 km above earth's surface is (Radius of the earth =6400 km)

Options:
A 0.9Â g
B 0.99 g
C 0.8Â g
D 1.01Â g

The correct answer is:
0.99 g

Solution:
h=32 km, R=6400 km , so h<<R
g′=g1-2hR=g1-2×326400 ⇒ g′=99100g=0.99 g

Topic: Physics, Gravitation, NEET
Acceleration due to gravity is g on the surface of the earth. Then the value of the acceleration due to gravity at a height of 32 km above the earth's surface is (Assume the radius of the earth to be 6400 km)

Options:
A 0.99 g
B 0.8 g
C 1.01 g
D 0.9 g

The correct answer is:
0.99 g

Solution:
Acceleration due to gravity at height h is
g′=g1+hRe2=g1+3264002=0.99 g

Topic: Physics, Gravitation, NEET
Acceleration velocity graph of a particle moving in a straight line is as shown in figure. The slope of velocity-displacement graph

Options:
A increases linearly
B decreases linearly
C is constant
D increases parabolically

The correct answer is:
is constant

Solution:
From the acceleration-velocity graph, we have a=k v where k is a constant which represents the slope of the given line.
As, a=vdvds, so vdvds=kv
or dvds=k=a constant
Thus, the slope of the velocity-displacement graph is the same as that of acceleration-velocity. Which is constant.

Topic: Physics, Motion In One Dimension, NEET
According to 2011 census, Indian population was:

Options:
A 1.2 million
B 844 million
C 1200 million
D 102.7 million

The correct answer is:
1200 million

Solution:
India's population, which was approximately 350 million at the time of our independence, reached close to the billion mark by 2000 and crossed 1.2 billion in May 2011, i.e., 1200 million.

Topic: Biology, Reproductive Health, NEET
According to accepted concept of hormone action, if receptor molecules are removed from target organs, the target organ will

Options:
A Continue to respond to hormone but in opposite way
B Continue to respond to the hormone without any difference
C Continue to respond to hormone but will require higher concentration
D Not respond to the hormone

The correct answer is:
Not respond to the hormone

Solution:
Hormones act on specific sites or receptors of target organs. Hence, if we remove the receptor molecule from the target organs, the target organ will not respond to the hormone.

Topic: Biology, Chemical Coordination and Integration, NEET
According to Alexander von Humboldt:

Options:
A Species richness decreases with increasing area of exploration
B Species richness increases with increasing area, but only up to limit
C There is no relationship between species richness and area explored.
D Species richness goes on increasing with increasing area of exploration

The correct answer is:
Species richness increases with increasing area, but only up to limit

Solution:
German naturalist and geographer Alexander von Humboldt while exploring the South American jungles, found that within a region species richness increased with increasing explored area but only up to a limit. The relationship between species richness and area turned out to be a rectangular hyperbola for a wide variety of organisms. The relationship is a straight line on a logarithmic scale.

S=CAZ

Applying logarithm on both sides:

logS = logC + ZlogA

where,

S = Species richness
A = Area
Z = Slope of the line (regression coefficient)
C = Y–intercept

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2020 (Phase 2)
According to Allen's rule, the mammals from cold climate have

Options:
A Shorter ears and longer limbs
B Shorter ears and shorter limbs
C Longer ears and shorter limbs
D Longer ears and longer limbs

The correct answer is:
Shorter ears and shorter limbs

Solution:
According to Allen's rule, mammals from cold climate have short ears and short limbs to minimize heat loss. Extremities like ears and limbs are reduced to decrease the area for heat loss.

Topic: Biology, Organisms and Populations, NEET
According to an estimate, almost _________ % forests have been lost in the tropics, compared to only ________ % in the temperate region.

Options:
A 1% and 40%
B 40% and 1%
C 20% and 40%
D 22% and 9%

The correct answer is:
40% and 1%

Solution:
According to an estimate, almost 40% of forests have been lost in the tropics, compared to only 1% in the temperate region. The present scenario of deforestation is particularly grim in India. At the beginning of the twentieth century, forests covered about 30% of the land of India. By the end of the century, it shrunk to 19.4%, whereas the National Forest Policy (1988) of India has recommended 33% forest cover for the plains and 67% for the hills.

Topic: Biology, Environmental Issues, NEET
According to Arrhenius theory, what are substances that dissociate in water to give hydrogen ions (H+) known as?

Options:
A Acids
B Bases
C Neutrals
D Salts

The correct answer is:
Acids

Solution:
According to Arrhenius theory, substances that dissociate in water to give hydrogen ions (H+) are known as acids.

Topic: Chemistry, Ionic Equilibrium, NEET
According to Arrhenius, what is required for the reaction between hydrogen and iodine to take place?

Options:
A Heat
B Light
C Collision of molecules
D Catalyst

The correct answer is:
Collision of molecules

Solution:
According to Arrhenius, the reaction between hydrogen and iodine can take place only when molecules of hydrogen and iodine collide.

Topic: Chemistry, Chemical Kinetics, NEET
According to Avogadro's law, when do equal volumes of different gases contain the same number of molecules?

Options:
A At different temperatures
B At different pressures
C At different volumes
D Under the same conditions of temperature and pressure

The correct answer is:
Under the same conditions of temperature and pressure

Solution:
Avogadro's law states that equal volumes of different gases contain the same number of molecules when they are under the same conditions of temperature and pressure.

Topic: Chemistry, States of Matter, NEET
According to Bergmann's rule, the mammals from cold climate have

Options:
A larger body and short extremities.
B larger body and extremities.
C shorter body and extremities.
D shorter body and larger extremities.

The correct answer is:
larger body and short extremities.

Solution:
Bergmann's rule states that organisms at higher latitudes should be larger and thicker than those closer to the equator to better conserve heat, and Allen's rule states that they will have shorter and thicker limbs at higher latitudes.

Topic: Biology, Organisms and Populations, NEET
According to Blackman's law of limiting factor, which of the following is the most important limiting factor in the process of photosynthesis?

Options:
A water
B CO2
C Light
D temperature

The correct answer is:
CO2

Solution:
CO2 is one of the most important factors affecting photosynthesis at normal field conditions. Other factors are equally important for the reaction to occur, but CO2 concentration fluctuation or lesser availability can completely alter the rate of reaction, which may also lead to photorespiration. The concentration of CO2 is very low in the atmosphere (between 0.03% and 0.04%)

Topic: Biology, Photosynthesis in Higher Plants, NEET
According to Bohr model, magnetic field at centre (at the nucleus) of a hydrogen atom due to motion of electron in the nth orbit is proportional to

Options:
A 1n3
B 1n5
C n5
D n3

The correct answer is:
1n5

Solution:
B=µ0i2r ; magnetic field at centre of hydrogen atom i.e. at nucleus.
i=eT=ef∝z2n3
And r∝n2Z
and B∝ir∝Z3n5
By solving B∝1n5

Topic: Physics, Atomic Physics, NEET
According to Bohr's model, the magnetic field at the centre (at the nucleus) of a hydrogen atom due to motion of an electron in the nth orbit is proportional to

Options:
A 1n3
B 1n5
C n5
D n3

The correct answer is:
1n5

Solution:
For an electron revolving around the nucleus,
i=ef
fâz2n3
iâez2n3
Again we know that,
rân2Z
Magnetic field at the center of the hydrogen atom, B=Î¼0i2r
BâÎ¼0Z32n5
Bâ1n5

Topic: Physics, Atomic Physics, NEET
According to Bohr's model, the minimum energy (in eV) required to remove an electron from the ground state of a doubly ionized Li atom Z=3 is

Options:
A 40.8
B 13
C 122.4
D 1.51

The correct answer is:
122.4

Solution:
The doubly ionized Li atom is H-like atom
En=-13.6Z2n2 eV
The ground state energy of the doubly ionised Li atom
(Z = 3, n = 1) will be
E1=-13.6×91=-122.4 eV
Hence, the ionisation energy for an electron in the ground state of doubly ionised Li atom =122.4 eV

Topic: Physics, Atomic Physics, NEET
According to Bohr's model, what is the quantum number that characterizes the Earth's revolution around the sun in an orbit of radius 1.5 × 1011m with an orbital speed of 3 × 104m/s? (Given: Mass of the Earth = 6.0 × 1024kg)

Options:
A 5.4 × 1022
B 2.6 × 1074
C 9.8 × 1030
D 1.2 × 1012

The correct answer is:
2.6 × 1074

Solution:
Correct Option is : (B)
2.6 × 1074

Topic: Chemistry, Atomic Physics, NEET
According to Bohr's theory, the time average magnetic moment of a hydrogen atom due to the motion of the electron in nth orbit is proportional to (n=principal quantum number)

Options:
A n
B n-1
C n-3
D n3

The correct answer is:
n

Solution:
M = πr2I
=πr2eT
=πr2ev2πr
M=I2erv
Now, v∝1n and r∝ n2
Hence, M∝n

Topic: Physics, Atomic Physics, NEET
According to Bronsted Lowry concept, the correct order of strength of bases follows the order

Options:
A CH3COO->OH->Cl-
B OH->CH3COO->Cl-
C CH3COO->Cl->OH-
D OH->Cl->CH3COO-

The correct answer is:
OH->CH3COO->Cl-

Solution:
According to Bronsted Lowry concept.
strength of conjugate base â1strength of acid
Strength of acid is as follows
HCl>CH3COOH>H2O
So the correct order of strength of bases follows the order
OH->CH3COO->Cl-

Topic: Chemistry, Ionic Equilibrium, NEET
According to cartesian sign convention, in ray optics

Options:
A All distances are taken negative
B All distances in the direction of incident ray are taken positive
C All distances are taken positive
D All distances in the direction of incident ray are taken negative

The correct answer is:
All distances in the direction of incident ray are taken positive

Solution:
According to cartesian sign convention, in ray optics all distance in the direction of incident ray are taken positive.

Topic: Physics, Ray Optics, NEET
According to Central Pollution Control Board (CPCB), particulate size _____ micrometers or less in diameter are hazardous to human health.

Options:
A 25
B 10
C 2.5
D 4.5

The correct answer is:
2.5

Solution:
According to Central Pollution Control Board (CPCB), particulate size 2.5 micrometers or less in diameter (PM 2.5) are responsible for causing the greatest harm to human health. These fine particulates can be inhaled deep into the lungs and can cause breathing and respiratory symptoms, irritation, inflammations and damage to the lungs and premature deaths.

Topic: Biology, Environmental Issues, NEET
According to Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health?

Options:
A 3.5 micrometers
B 2.5 micrometers
C 4.0 micrometers
D 3.0 micrometers

The correct answer is:
2.5 micrometers

Solution:
According to Central Pollution Control Board (CPCB), particulate matter size 2.5 micrometres or less in diameter are responsible for causing the greatest harm to human health. These fine particulate matter can be inhaled deep into the lungs and can cause irritation, breathing and respiratory symptoms, inflammations and damage to the lungs and premature deaths.

Topic: Biology, Environmental Issues, NEET, NEET 2020 (Phase 2)
According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometres) of the air pollutants is responsible for greatest harm to human health?

Options:
A 2.5 or less
B 1.5 or less
C 1.0 or less
D 5.2 or 2.5

The correct answer is:
2.5 or less

Solution:
Particles in the size range $1-10 \mu \mathrm{m}$ have measurable settling velocities but are readily stirred by air movements whereas particles of size 0.1-1 $\mu \mathrm{m}$ have small settling velocities. Those below $0.1 \mu \mathrm{m}$, a submicroscopic size found in Urban air, undergo random Brownian motion resulting from collisions among individual molecules. Of all the different types of particulates in the atmosphere, the presence of trace elements such as cadmium, lead, nickel and mercury may constitute the greatest health hazard.

Topic: Biology, Environmental Issues, NEET, NEET 2008 (Screening)
According to chemiosmotic hypothesis, ATP synthetase form ADP when protons (H+):

Options:
A Move from stroma to thylakoid lumen by simple diffusion
B Move from stroma to thylakoid lumen by facilitated diffusion
C Move from thylakoid lumen to stroma by active transport
D Move from thylakoid lumen to stroma by facilitated diffusion

The correct answer is:
Move from thylakoid lumen to stroma by facilitated diffusion

Solution:
In non-cyclic photophosphorylation, cytochrome uses the energy of electrons from PSII to pump hydrogen ions from the lumen (an area of high concentration) to the stroma (an area of low concentration). The energy released by the hydrogen ion stream allows ATP synthase to attach a third phosphate group to ADP, which forms ATP. This flow of hydrogen ions through ATP synthase is called chemiosmosis because the ions move from an area of high to an area of low concentration through a semi-permeable structure.

Topic: Biology, Photosynthesis in Higher Plants, NEET
According to classical physics, what does the energy content of a beam of light depend on?

Options:
A The color of the light
B The brightness of the light
C The frequency of the light
D The intensity of the light

The correct answer is:
The brightness of the light

Solution:
According to classical physics, the energy content of a beam of light depends on the brightness of the light.

Topic: Chemistry, Structure of Atom, NEET
According to collision theory, what are reactant molecules assumed to be like?

Options:
A Liquid droplets
B Soft spheres
C Hard spheres
D Gaseous clouds

The correct answer is:
Hard spheres

Solution:
According to collision theory, reactant molecules are assumed to be hard spheres.

Topic: Chemistry, Chemical Kinetics, NEET
According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature $T$ is proportional to:

Options:
A $\frac{1}{T}$
B $T$
C $\frac{1}{T^2}$
D $T^2$

The correct answer is:
$\frac{1}{T}$

Solution:
From Curie Law $X_m \propto \frac{1}{T}$

Topic: Physics, Magnetic Properties of Matter, NEET, NEET 2003
According to Darwin, a new species arises due to which of the following two factors?

Options:
A Natural selection and branching descent
B Branching descent and mutation
C Mutation and natural selection
D Variation and mutation

The correct answer is:
Natural selection and branching descent

Solution:
Mutation is sudden or developed change in genetic sequence discovered by Hugo De Vries.
Useful variation helps an organism to utilise its resources more efficiently so that its chance of survival increases and it may produce more progeny to evolve new population.

Topic: Biology, Evolution, NEET
According to Darwin, the organic evolution is due to

Options:
A intraspecific competition
B interspecific competition
C competition within closely related species
D reduced feeding efficiency in one species due to the presence of interfering species

The correct answer is:
interspecific competition

Solution:
Darwin stated that, the organic evolution is due to interspecific competition. It is the competition between members of different species. Intraspecific competition occurs amongst members of the same species for obtaining optimum amounts of their food, shelter, mate, water, light, etc. Closely related species if compete cannot cause evolution. Reduced feeding efficiency in one species due to the presence of interfering species is due to strugle for existence.

Topic: Biology, Evolution, NEET, NEET 2013 (All India)
According to Darwin, which of the following variations enable the individual to reproduce and leave more progeny?

Options:
A Heritable
B Non-heritable
C The organism that are more adoptable to use the resource
D Both A and C

The correct answer is:
Both A and C

Solution:
Fitness is the end result of the ability to adapt and get selected by nature. In an organism, the so-called fitness depends upon the inherited characteristics, so there must be a genetic basis for getting selected and to evolve. Some organisms in a population are better adapted to survive in an hostile environment.

Topic: Biology, Evolution, NEET
According to Darwinism, which option represents the correct sequence of events in the origin of new species?

1 = Natural selection

2 = Variation and their inheritance

3 = Survival of the fittest

4 = Struggle for existence

Options:
A 1, 2, 3, 4
B 2, 3, 1, 4
C 3, 4, 1, 2
D 4, 2, 3, 1

The correct answer is:
4, 2, 3, 1

Solution:
Charles Darwin proposed that there was struggle for existence and fittest of them survived. Darwin thought that there was no limit to variations caused due to genetic events. He gave theory of natural selection- a key mechanism of evolution; which is the differential survival and reproduction of individuals due to differences in phenotype.

Topic: Biology, Evolution, NEET
According to Darwin's theory of evolution, what is the rate of appearance of new forms of life?

Options:
A Fast
B Slow
C Depends on the life span of the organism
D None of the above

The correct answer is:
Depends on the life span of the organism

Solution:
According to Darwin's theory of evolution, the rate of appearance of new forms of life depends on the life span of the organism. Microbes that divide fast have the ability to multiply and become millions of individuals within hours.

Topic: Biology, Evolution, NEET
According to Darwin's theory of evolution, what is the reason for population sizes being limited?

Options:
A Limited natural resources
B Seasonal fluctuation
C Competition for resources
D All of the above

The correct answer is:
All of the above

Solution:
According to Darwin's theory of evolution, population sizes are limited due to a combination of limited natural resources, seasonal fluctuation, and competition for resources.

Topic: Biology, Evolution, NEET
According to de Broglie, matter should exhibit dual behaviour, that is both particle and wave-like properties. However, a cricket ball of mass 100 g does not move like a wave when it is thrown by a bowler at a speed of 100 km/h. Calculate the wavelength of the ball .

Options:
A 1.5 × 10⁻³⁴ m
B 2.4 × 10⁻³⁴ m
C 3.5 × 10⁻³⁴ m
D 4.5 × 10⁻³⁴ m

The correct answer is:
2.4 × 10⁻³⁴ m

Solution:
Correct Option is : (B)
2.4 × 10⁻³⁴ m

Topic: Chemistry, Structure of Atom, NEET
According to de Broglie, what does every object in motion possess?

Options:
A Mass
B Charge
C Energy
D Wave character

The correct answer is:
Wave character

Solution:
According to de Broglie, every object in motion has a wave character.

Topic: Chemistry, Structure of Atom, NEET
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectron ejected and the frequency o the incident radiation is

Options:
A
B
C
D

The correct answer is:

Solution:
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectron ejected and the frequency o the incident radiation is
As when v=v0 , the kinetic energy of photoelectrons is zero, further the K.E. of photoelectrons increases with increase in the frequency of the radiation.

Topic: Chemistry, Structure of Atom, NEET
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectron ejected and the frequency of incident radiation is:

Options:
A

B

C

D

The correct answer is:

Solution:
$$
\text { We know that }
$$

Topic: Physics, Dual Nature of Matter, NEET, NEET 2004
According to Einstein's photoelectric equation, the graph between the kinetic energy of photo-electrons ejected and the frequency of incident radiation is

Options:
A
B
C
D

The correct answer is:

Solution:
Kmax=hv-ϕ
Comparing with equation of straight line
y=mx+c
m=h,
c=-ϕ
so, straight line with positive slope and negative intercept on y- axis.

Topic: Physics, Dual Nature of Matter, NEET
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

Options:
A

B

C

D

The correct answer is:

Solution:
According to Einstein's equation of the photoelectric effect

E=ϕ+K.E.

or hυ=ϕ+K.E.

or K.E.=hυ-ϕ

Topic: Physics, Dual Nature of Matter, NEET
According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal Vs the frequency, of the incident radiation gives a straight line whose slope

Options:
A Depends on the nature of the metal used
B Depends on the intensity of the radiation
C Depends both on the intensity of the radiation and the metal used
D Is the same for all metals and independent of the intensity of the radiation

The correct answer is:
Is the same for all metals and independent of the intensity of the radiation

Solution:
Einstein's photoelectric equation is
KEmax=hv-Ï ...(i)
The equation of line is
y=mx+c ...(ii)
Comparing above two equations
m=h, c=-Ï
Hence, slope of graph is equal to Planck's constant (non-variable) and does not depend on intensity of radiation.

Topic: Physics, Dual Nature of Matter, NEET