datavorous/entrance-exam-dataset huggingface dataset:
The phase difference between displacement and acceleration of a particle in a simple harmonic motion is:

Options:
A 3π2rad
B π2rad
C zero
D π rad

The correct answer is:
π rad

Solution:
Displacement (x) equation of SHM

x=Asin(ωt+ϕ) ....(1)

dxdt=Aωcosωt+ϕ

acceleration a=d2xdt2

a=-ω2Asinωt+ϕ

a=ω2Asinωt+ϕ+π ....(2)

from (1) & (2), phase difference between displacement and acceleration is π.

Topic: Physics, Oscillations, NEET, NEET 2020 (Phase 1)
The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is :

Options:
A $\pi$
B $0.70 \pi$
C zero
D $0.5 \pi$

The correct answer is:
$0.5 \pi$

Solution:
Let $y=A \sin \omega t=A \omega^2 \sin (\omega t+\pi)$
$\begin{aligned}
& \therefore \quad \frac{d y}{d t}=A \omega \cos \omega t \\
& \therefore \quad=A \omega \sin \left(\omega t+\frac{\pi}{2}\right) \\
& \text { Acceleration }=-A \omega^2 \cos \omega t=A \omega^2 \\
& \sin (\omega t+\pi) \\
& \therefore \text { Phase difference }=\pi-\frac{\pi}{2}
\end{aligned}$

Topic: Physics, Oscillations, NEET, NEET 2007
The phase difference between two points is Ï3. If the frequency of waves is 50 Hz, then, the distance between two points is (Given v=330 m s-1)

Options:
A 2.2 m
B 1.1 m
C 0.6 m
D 1.7 m

The correct answer is:
1.1 m

Solution:
From the relation,
âÏ=2ÏÎ»Ãâx
â¹âx=Î»2ÏÃâÏ â¦i
Also, Î»=vn â¦ii
Now, from Eqs.(i) and (ii), we get
âx=v2ÏnÃâÏ
â¹ âx=3302ÏÃ50ÃÏ3
or âx=1.1 m

Topic: Physics, Waves and Sound, NEET
The phase difference between two points separated by 0.8 m in a wave of frequency 120 Hz is 0.5Ï. The wave velocity is

Options:
A 144 m s-1
B 384 m s-1
C 256 m s-1
D 720 m s-1

The correct answer is:
384 m s-1

Solution:
Here, f=120 Hz, x=0.8 m and Ï=0.5Ï.
From, Ï=2ÏÎ»x and Î»=2ÏxÏ=2ÏÃ0.80.5Ï=3.2 m
v=nÎ»=120Ã3.2=384 m s-1

Topic: Physics, Waves and Sound, NEET
The phase difference between two waves represented by
$\begin{aligned}
& y_1=10^{-6} \sin [100 t+(x / 50)+0.5] \mathrm{m} \\
& y_1=10^{-6} \cos [100 t+(x / 50)] \mathrm{m}
\end{aligned}$
where $x$ is expressed in metres and $t$ is expressed in seconds is approximately

Options:
A 1.07 radians
B 2.07 radians
C 0.5 radians
D 1.5 radians

The correct answer is:
1.07 radians

Solution:
Here $y_1=10^6 \sin \left[100 t+\left(\frac{x}{50}\right)+0.5\right]$
$\begin{aligned}
& \text {and } y_2=10^{-6} \cos \left[100 t+\left(\frac{x}{50}\right)\right] \\
& =10^{-6} \sin \left[100 t+\left(\frac{x}{50}\right)+\frac{\pi}{2}\right] \\
& =10^{-6} \sin \left[100 t+\left(\frac{x}{50}\right)+1.57\right]
\end{aligned}$
Then comparing the equation of $y_1$ and $y_2$ we get phase difference $=$ $1.57-0.5=1.07$

Topic: Physics, Waves and Sound, NEET, NEET 2004
The phase difference between two waves, represented by
y1 = 10â6 sin [100t + (x50) + 0.5] m
y2 = 10â6 cos[100t + (x50)] m,
where x is expressed in metres and t is expressed in seconds, is approximately

Options:
A 1.07 rad
B 2.07 rad
C 0.5 rad
D 1.5 rad

The correct answer is:
1.07 rad

Solution:
y1 = 10–6 sin [100t + (x50) + 0.5]
y2 = 10-6cos[100t + (x/50)]
= 1 0 - 6 sin 1 0 0 t + x / 5 0 + π 2
= 10–6sin[100t + (x50) + 1.57]
using cos x = sin x + π 2
The phase difference = 1.57 – 0.5 = 1.07
or using sin=cosπ2-x· We get the same result.

Topic: Physics, Oscillations, NEET
The phase difference between voltage and current in an AC circuit containing a resistor and an inductor in series is ϕ 1 . When the inductor is replaced by a capacitor, the phase difference is changed to ϕ 2 . The phase difference when all the three elements are connected in series with the same AC source will be

Options:
A tan - 1 tan ϕ 1 - tan ϕ 2
B tan - 1 tan ϕ 2 - tan ϕ 1
C cos - 1 cos ϕ 1 - cos ϕ 2
D cos - 1 cos ϕ 2 - cos ϕ 1

The correct answer is:
tan - 1 tan ϕ 1 - tan ϕ 2

Solution:
tan Ï 1 = X L R , tan Ï 2 = X C R
tan Ï = X L - X C R = tan Ï 1 - tan Ï 2
Ï = tan - 1 tan Ï 1 - tan Ï 2

Topic: Physics, Alternating Current, NEET
The phase in which cells tend to become inactive, stop dividing and become specialised through the differentiation process is called ___

Options:
A G1 phase
B G0 phase
C G2 phase
D M phase

The correct answer is:
G0 phase

Solution:
The phase in which cells tend to become inactive, stop dividing and become specialised through the differentiation process is called G0 phase

Topic: Biology, Cell Cycle and Cell Division, NEET
The phenomenon of alternation of generations between sexual and asexual mode of reproduction is known as?

Options:
A Metamorphosis
B Metagenesis
C Segmentation
D None of the above

The correct answer is:
Metagenesis

Solution:
The phenomenon of alternation of generations between sexual and asexual mode of reproduction is known as Metagenesis.

Topic: Biology, Animal Kingdom, NEET
The phenomenon of development of organisms without fertilization of ovum is known as

Options:
A adventitive embryony.
B polyembryony.
C parthenocarpy.
D parthenogenesis.

The correct answer is:
parthenogenesis.

Solution:
Some organisms like rotifers, honeybees, and even some lizards and birds (turkey), the female gametes undergo development to form new organisms without fertilization. This phenomenon is called parthenogenesis.

When fruit is developed by this technique, it is called parthenocarpy.

Topic: Biology, Reproduction in Organisms, NEET
The phenomenon of evolution of different species in a given geographical area starting from a point and spreading to other habitats is called:

Options:
A Saltation
B Co-evolution
C Natural selection
D Adaptive radiation

The correct answer is:
Adaptive radiation

Solution:
The process of evolution of different species in a given geographical area starting from a point and literally radiating to other areas of geography (habitats) is called adaptive radiation. or When because of the competition for food and living space, a single ancestral species evolves into different species/forms which occupy different habitats (areas), it is called the adaptive radiation.

Example: Darwin finches and Australian marsupials

Topic: Biology, Evolution, NEET, NEET 2020 (Phase 2)
The phenomenon of induction of flowering upon low temperature treatment is known as?

Options:
A Vernalization
B Photoperiodism
C Cryopreservation
D Cryostat

The correct answer is:
Vernalization

Solution:
There are plants for which flowering is either quantitatively or qualitatively dependent on exposure to low temperature. This phenomenon is termed vernalization. It prevents precocious reproductive development late in the growing season and enables the plant to have sufficient time to reach maturity. Vernalization refers specially to the promotion of flowering by a period of low temperature.

Topic: Biology, Plant - Growth and Development, NEET
The phenomenon of inheritance where none of the contrasting characters in a pair is dominant is called ___.

Options:
A Co-dominance
B Incomplete dominance
C Complete dominance
D None of the above

The correct answer is:
Incomplete dominance

Solution:
The phenomenon of inheritance where none of the contrasting characters in a pair is dominant is called Incomplete dominance

Topic: Biology, Principles of Inheritance and Variation, NEET
The phenomenon of optical activity will be shown by:

Options:
A
B
C
D

The correct answer is:

Solution:
Compounds which do not possess elements of symmetry are optically active.

Topic: Chemistry, Coordination Compounds, NEET
The phenomenon of pleiotropism refers to:

Options:
A More than two genes affecting a single character.
B Presence of several alleles of a single gene controlling a single crossover.
C Presence of two alleles, each of the two genes controlling a single trait.
D A single gene affecting multiple phenotypic expressions.

The correct answer is:
A single gene affecting multiple phenotypic expressions.

Solution:
A single gene can exhibit multiple phenotypic expression in an organism. Such a gene is called a pleiotropic gene. The underlying mechanism of the pleiotropy is the effect of a gene (and its alleles) on the metabolic pathways which contribute towards different phenotypes.

Some common example of pleiotropy is phenylketonuria, a disease is caused by mutation in the gene that codes for the enzyme phenyl alanine hydroxylase (single gene mutation). This results into the phenotypic expression characterised by mental retardation and a reduction in hair and skin pigmentation.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2023 (All India)
The phenomenon of sperm production from the immature germ cell in males is called ___.

Options:
A Spermiation
B Spermiogenesis
C Spermatogenesis
D None of the above

The correct answer is:
Spermiogenesis

Solution:
The phenomenon of sperm production from the immature germ cell in males is called spermatogenesis

Topic: Biology, Human Reproduction, NEET
The phenomenon of the formation of haploid female gametes known as ova from diploid oogina in the ovary is called ___.

Options:
A Spermatogenesis
B Fertilisation
C Menstruation
D Oogenesis

The correct answer is:
Oogenesis

Solution:
The phenomenon of the formation of haploid female gametes known as ova from diploid oogonia in the ovary is called Oogenesis.

Topic: Biology, Human Reproduction, NEET
The phenomenon of the transformation of non-motile spermatids to mature, motile spermatozoa is called ____

Options:
A Spermatogenesis
B Fertilisation
C Spermiation
D Spermiogenesis

The correct answer is:
Spermiogenesis

Solution:
The phenomenon of the transformation of non-motile spermatids to mature, motile spermatozoa is called spermiogenesis

Topic: Biology, Human Reproduction, NEET
The phenomenon of uptake of water at the expense of energy by the cell and usually against the osmotic gradient is known as

Options:
A Osmosis
B Active absorption
C Passive absorption
D Imbibition

The correct answer is:
Active absorption

Solution:
In active absorption, uptake of substance occurs against the concentration gradient by using energy in the form of ATP. When absorption of substances occurs along the concentration gradient than energy is not consumed and this is called passive absorption.

Topic: Biology, Transport in Plants, NEET
The phenomenon that is not part of Darwin's theory was:

Options:
A Survival of the fittest
B Arrival of the fittest
C Branching descent
D Struggle for existence

The correct answer is:
Arrival of the fittest

Solution:
Darwin's theory also known as the theory of natural selection is based on the principle of survival of the fittest. The variations in the organisms and the individuals who are better adapted to the environmental conditions and struggle for existence survive in comparison to those who fail to get adapted to the environment. Charles Darwin failed to explain the origin of the variation and mechanism of speciation thus limited his theory.
Branching descent and natural selection are the two key concepts of Darwinian theory of evolution.

Topic: Biology, Evolution, NEET
The phenomenon where mature spermatozoa are released from the Sertoli cells into the lumen of the seminiferous tubules of the testes is called ___.

Options:
A Spermatogenesis
B Spermiation
C Spermiogenesis
D None of the above

The correct answer is:
Spermiation

Solution:
The phenomenon where mature spermatozoa are released from the Sertoli cells into the lumen of the seminiferous tubules of the testes is called Spermiation

Topic: Biology, Human Reproduction, NEET
The phenomenon which is influenced by auxin and also played a major role in its discovery :

Options:
A Gravitropism
B Apical Dominance
C Phototropism
D Root initiation

The correct answer is:
Phototropism

Solution:
Auxin influences phototropism, i.e., the growth of the plant in response to light stimulus and this phenomenon played a major role in its discovery. Charles Darwin and his son Francis Darwin observed that the coleoptile of canary grass responded to the unilateral illumination by growing towards the light source (phototropism). They concluded that the tip of coleoptile was the source of auxin and was the site of transmittable influence that caused the bending of the entire coleoptile.

Topic: Biology, Plant - Growth and Development, NEET, NEET 2023 (Manipur)
The phospholipid present in the cell membrane has

Options:
A hydrophilic head and hydrophobic tails
B hydrophobic head and hydrophilic tails
C hydrophilic head and hydrophilic tails
D hydrophobic head and hydrophobic tails

The correct answer is:
hydrophilic head and hydrophobic tails

Solution:
Phospholipids are lipid molecules made up of two fatty acids, glycerol and a phosphate group. They are components of the cell membrane and allow passage of selected substances in and out of the cell. The structure of these lipids is bilayered with a hydrophilic head (water-loving) and a hydrophobic tail (water-hating). Due to this property, they are also called amphipathic.

Topic: Biology, Cell - The Unit of Life, NEET
The photoelectric threshold frequency of a metal is v. When light of frequency 4v is incident on the metal. The maximum kinetic energy of the emitted photoelectrons is

Options:
A 4 hv
B 3 hv
C 5 hv
D 52 hv

The correct answer is:
3 hv

Solution:
From Einstein's photoelectric equation the maximum kinetic energy of photoelectrons emitted from metal surface is given by
Ek=hv1-W
Where W is work function of metal.
Given, W=hv and v1=4v
∴ Ek=4hv-hv=3hv

Topic: Physics, Dual Nature of Matter, NEET
The photoelectric threshold frequency of metal is Î½. When the light of frequency 4Î½ is incident on the metal, the maximum kinetic energy of the emitted photoelectrons is

Options:
A 4hν
B 3hν
C 5hν
D 52hν

The correct answer is:
3hν

Solution:
From Einstein's photoelectric equation the maximum kinetic energy of photoelectrons emitted from the metal surface is given by
Ek=hν1-W
Where W is the work function of the metal.
Given, W=hν and ν1=4ν
∴ Ek=4hν-hν=3hν

Topic: Physics, Dual Nature of Matter, NEET
The photoelectric threshold wavelength of silver is 3250×10–10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536×10–10 m is:-
Given h=4.14×10-15 eV s and c=3×108 m s-1

Options:
A â6Ã106 m s-1
B â0.6Ã106 m s-1
C â61Ã103Â m s-1
D â0.3Ã106Â m s-1

The correct answer is:
â0.6Ã106 m s-1

Solution:
λ0=3250×10-10 m
λ=2536×10-10 m
ϕ=hcλ0=1242 eV-nm325 nm=3.82 eV
hν=hcλ=1242 eV-nm253.6 nm=4.89 eV
By Einstein’s photoelectric equation
Kmax=hcλ- hc λ 0
KEmax=4.89-3.82 eV=1.07 eV
12mv2=1.07×1.6×10-19
v= 2×1.07×1.6×10-199.1×10-31
v=0.6×106 m/s

Topic: Physics, Dual Nature of Matter, NEET, NEET 2017
The photomicrographs show cells in various stages of the cell cycle. Identify the stage where semi-conservative replication of DNA takes place.

Options:
A
B
C
D

The correct answer is:

Solution:
S or synthesis phase marks the period during which DNA synthesis or replication takes place. During this time, the amount of DNA per cell doubles. Prophase is marked by the initiation of condensation of chromosomal material. The chromosomal material becomes untangled during the process of chromatin condensation. The metaphase is characterised by all the chromosomes coming to lie at the equator with one chromatid of each chromosome connected by its kinetochore to spindle fibres. At the onset of anaphase, each chromosome arranged at the metaphase plate is split simultaneously and the two daughter chromatids begin their migration towards the two opposite poles.

Topic: Biology, Cell Cycle and Cell Division, NEET
The photosensitive compound in the human eye is made up of:

Options:
A Guanosine and Retinol
B Opsin and Retinal
C Opsin and Retinol
D Transducin and Retinene

The correct answer is:
Opsin and Retinal

Solution:
Rhodopsin which is a photosensitive pigment present in the human eye is made of opsin and retinal. Rhodopsin pigment is present in rod cells which is responsible for night vision. It is also called visual purple.

Hence, opsin and retinal is the correct answer.

Topic: Biology, Neural Control and Coordination, NEET, NEET 2016 (Phase 1)
The photosensitive compound in the human eye is made up of:

Options:
A Guanosine and Retinol
B Opsin and Retinal
C Opsin and Retinol
D Transducin and Retinene

The correct answer is:
Opsin and Retinal

Solution:
Rhodopsin which is a photosensitive pigment present in the human eye is made of opsin and retinal.

Topic: Biology, Neural Control and Coordination, NEET
The photosensitive metallic surface has work function $h v_0$ fall on this surface, the electrons come out with a maximum velocity of $4 \times 10^6 \mathrm{~m} / \mathrm{s}$. When the photon energy is increased $5 h v_0$. Then maximum velocity of photoelectrons will be:

Options:
A $2 \times 10^7 \mathrm{~m} / \mathrm{s}$
B $2 \times 10^6 \mathrm{~m} / \mathrm{s}$
C $8 \times 10^6 \mathrm{~m} / \mathrm{s}$
D $8 \times 10^5 \mathrm{~m} / \mathrm{s}$

The correct answer is:
$8 \times 10^6 \mathrm{~m} / \mathrm{s}$

Solution:
According to the question
$$
\begin{gathered}
2 h v_0=h v_0+\frac{1}{2} m\left(4 \times 10^6\right)^2 \\
5 h v_0=h v_0+\frac{1}{2} m v^2 \\
\Rightarrow 4 \times \frac{1}{2} m\left(4 \times 10^6\right) \\
\Rightarrow \frac{1}{2} m v^2 \\
v=8 \times 10^6 \mathrm{~m} / \mathrm{s}
\end{gathered}
$$

Topic: Physics, Dual Nature of Matter, NEET, NEET 2005
The physical quantity that has the same dimensional formula as pressure is:

Options:
A Force
B Momentum
C Young's modulus of elasticity
D Coefficient of viscosity

The correct answer is:
Young's modulus of elasticity

Solution:
Dimensions of Pressure $=\left[\mathrm{ML}^{-1} \mathrm{~T}^{-}\right.$ $\left.{ }^2\right]$
Dimension of Force $=\left[\mathrm{MLT}^{-2}\right]$
Dimension of Momentum $=\left[\mathrm{MLT}^{-1}\right]$
Dimension of Young's modulus of elasticity $=$ $\left[\mathrm{ML}^{-1} \mathrm{~T}^{-2}\right]$
Dimension of coefficient of viscosity $=\left[\mathrm{ML}^{-1} \mathrm{~T}^{-1}\right]$

Topic: Physics, Units and Dimensions, NEET, NEET 2022 (Phase 2)
The picture below is a microscopic image of a plant cell found in the leaf. In this cell, identify the labelled part that helps with storage of material in the cell.

Options:
A P
B Q
C R
D S

The correct answer is:
S

Solution:
Plant cells come under the category of eukaryotic cells, which means they have membrane structures called organelles. In the given image, label P is the nucleus which regulates all the functions and activities of the cell. Label Q is the chloroplast, unique to plant cell, which acts as the site for photosynthesis process. Label R refers to the cell wall, again unique to plant cell, which is made of cellulose and provides rigidity to the plant cell. Label S is vacuole, which is the largest organelle in plant cell and helps with storage of cell products and substances for the plant cell.

Topic: Biology, Cell - The Unit of Life, NEET
The picture given below depicts the phenomenon of heterophylly of a plant. Find the incorrect statement with reference to the same.

Options:
A The type of heterophylly seen in A and B is an example of plasticity in plants.
B The appearance of leaf A is due to the developmental changes underwent by the plant in a terrestrial habitat.
C Heterophylly is prominently observed between the juvenile and mature stages in cotton plants.
D The appearance of leaf B caters to the foliage found in forests.

The correct answer is:
The appearance of leaf A is due to the developmental changes underwent by the plant in a terrestrial habitat.

Solution:
Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called plasticity, e.g., heterophylly in cotton, coriander and larkspur. In such plants, the leaves of the juvenile plant are different in shape from those in mature plants. On the other hand, difference in shapes of leaves produced in air and those produced in water in buttercup also represent the heterophyllous development due to environment. This phenomenon of heterophylly is an example of plasticity.

Topic: Biology, Plant - Growth and Development, NEET
The piece of plan used in tissue culture is called

Options:
A explant
B somaclone
C inoculant
D clone

The correct answer is:
explant

Solution:
Producing clones using plant tissue culture is part of micropropagation. In it, the tissue is grown in a nutrient medium under sterile environment. The tissue pieces isolated from the plant is referred to as explant.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
The pigment in blue-green algae is _____ which is the same as the one found in green plants. These blue-green algae are _______.

Options:
A Phycocyanin, Photoautotrophs
B Heterocysts, Nitrogen fixers
C All pigments except chlorophyll a, Photoautotrophs
D Chlorophyll a, photoautotrophs

The correct answer is:
Chlorophyll a, photoautotrophs

Solution:
The question signals towards the similarity with green plants which have the green photosynthetic pigment. The organisms who produce their own food and energy using light & carbon-di-oxide are known as Photoautotrophs. Hence, Cyanobacteria which contains Chlorophyll is capable of producing its food & energy and in turn releasing oxygen in the atmosphere.

Topic: Biology, Biological Classification, NEET
The pigment involved in red-far red light interconversion is

Options:
A Cytochrome
B Xanthophyll
C Lycopene
D Phytochrome

The correct answer is:
Phytochrome

Solution:
Phytochrome is responsible for the absorption of red and far-red light, and it is involved in red–far-red light interconversion.

Topic: Biology, Photosynthesis in Higher Plants, NEET
The pigment that absorb red and far-red light is

Options:
A carotene.
B xanthophyll.
C chlorophyll.
D phytochrome.

The correct answer is:
phytochrome.

Solution:
Carotene, xanthophyll and chlorophyll are photosynthetic pigments present in almost all the plants. Their absorption spectrum is between 400-700nm. Blue-green receptor of plant absorb red and far-red light which ranges between 700-750nm. This receptor helps in seed germination, flowering, leaf elongation etc. Phytochrome receptor are of two types Pr and Pfr which absorbs red and far-red light respectively. They are responsible for flowering due to photoperiodism.

Topic: Biology, Photosynthesis in Higher Plants, NEET
The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of:

Options:
A NAA, 2, 4-D
B Phenyl acetic acid
C Cytokinin
D IAA, IBA

The correct answer is:
NAA, 2, 4-D

Solution:
NAA (alpha Naphthalene acetic acid) and 2,4 Dichlorophenoxy acetic acid are synthetic auxins. Normally, auxins inhibit flowering. In litchi and pineapple, it promotes flowering.
Related Theory
Antiauxins are a group of chemicals that can prevent auxin-action in plants. Transcinnamic acid, ascorbic acid, 7-phenyl butyric acid are some of these antiauxins. Probably, an antiauxin competes with an auxin for the same site of reaction and thus inhibits auxin-action.

Topic: Biology, Plant - Growth and Development, NEET, NEET 2013 (Karnataka)
The pioneer species in a hydrarch succession are:

Options:
A Free-floating angiosperms
B Submerged rooted plants
C Phytoplanktons
D Filamentous algae

The correct answer is:
Phytoplanktons

Solution:
Hydrarch succession is a series of communities in aquatic habitat. It is started with phytoplankton as pioneer species. Both Hydrarch and Xerarch are ended in nearly same type of condition called Mesarch.

Topic: Biology, Ecosystem, NEET, NEET 2022 (Phase 2)
The piston in the cylinder head of a locomotive has a stroke (twice the amplitude) of 1.0 m. If the piston moves with simple harmonic motion with an angular frequency of 200 rad/min, what is its maximum speed ?

Options:
A 200m/min
B 150m/min
C 50m/min
D 100m/min

The correct answer is:
100m/min

Solution:
Correct Option is : (D)
100m/min

Topic: Chemistry, Oscillations, NEET