datavorous/entrance-exam-dataset huggingface dataset:
A police car moving at 22 m s-1 chases a motorcyclist. The policeman sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle if it is given that the motorcyclist does not observe any beats (speed of sound = 330 m s-1)

Options:
A 33 m s-1

B 22 m s-1

C Zero
D 11 m s-1

The correct answer is:
22 m s-1

Solution:
The motorcyclist observes no beats. So the apparent frequency observed by him from the two sources must be equal.
f⁡ 1 = f⁡ 2
∴ 1 7 6 3 3 0 - v⁡ 3 3 0 - 2 2 = 1 6 5 3 3 0 + v⁡ 3 3 0
Solving this equation, we get v⁡=22 m s-1

Topic: Physics, Waves and Sound, NEET
A police car moving at 30 m s-1, chases a motorcyclist. The policeman sounds his horn at 180 Hz, while both of them move towards a stationary siren of frequency 160 Hz. Calculate the speed of the motorcyclist, if it is given that he does not observes any beats (take, the speed of sound =330 m s-1 ).

Options:
A 25 m s-1
B 30 m s-1
C 35.02 m s-1
D 40 m s-1

The correct answer is:
35.02 m s-1

Solution:
Speed of sound vS=330 m s-1
Case (i),
f1=f0Vs-u0Vs-us
=f0330-u330-30=180 (330-u)300
f1=180 330-u300 ... (i)
Case (ii), f2=160 330+u330 ... (ii)
âµ There is no beats
â´ f1=f2
180=330-u300=160330+u330
â 9330-u30=8330-u33
â¹ 910330-u=811330+u
â¹32670-99u=26400+80u
â´ u=6270179=35.02 m s-1

Topic: Physics, Waves and Sound, NEET
A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km h-1 towards a tall building which reflects the sound waves. The speed of sound in air is 320 m s-1. The frequency of the siren heard by the car driver is

Options:
A 8.5 kHz
B 8.25 kHz
C 7.25 kHz
D 7.5 kHz

The correct answer is:
8.5 kHz

Solution:
36 km h-1=36Ã518=10 m s-1

Apparent frequency of sound heard by car driver (observer)
fâ²â²=fv+vov-vs
=8320+10320-10
fâ²â²=8.5 kHz

Topic: Physics, Waves and Sound, NEET
A polymer has only one type of building block called monomer repeated 'n' number of times. A heteropolymer has more than one type of monomer. Proteins are heteropolymers made of amino acids. If a nucleic acid, like DNA or RNA, is made of only 4 types of nucleotide monomers, proteins are made of:

Options:
A 20 types of monomers
B 40 types of monomers
C 3 types of monomers
D Only one type of monomer

The correct answer is:
20 types of monomers

Solution:
Proteins are polypeptides. They are linear chains of amino acids linked by peptide bonds. Each protein is a polymer of amino acids. As there are 20 types of amino acids (e.g., alanine, cysteine, proline, tryptophan, lysine, etc.), a protein is a heteropolymer and not a homopolymer. A homopolymer has only one type of monomer repeating ânâ number of times.

Topic: Chemistry, Biomolecules, NEET
A polymer is resistant to heat and chemical attack and is also used for coating articles and cookwares to make them non-sticky. The monomer of this polymer is

Options:
A mono chlorotrifluoroethylene
B tetrafluoroethylene
C chloroprene
D vinyl chloride

The correct answer is:
tetrafluoroethylene

Solution:
Teflon polymer is resistant to heat and chemical attack and is also used for coating articles and cookwares to make them non-sticky. its monomer is tetrafluoroethylene.

Topic: Chemistry, Polymers, NEET
A polypeptide of five amino acids is synthesized during protein synthesis in eukaryotic cells. Which one of the following can be the correct polypeptide?

Options:
A Glycine - valine - methionine - histidine - lysine
B Methionine - glycine - histidine - lysine - valine
C Valine - methionine - glycine - histidine - lysine
D Histidine - lysine - methionine - valine - glycine

The correct answer is:
Methionine - glycine - histidine - lysine - valine

Solution:
Methionine is the starting amino acid that will be present in all the peptides that are synthesized during translation. The start codon for the translation process is AUG/GUG which codes for the amino acid methionine.

Topic: Biology, Molecular Basis of Inheritance, NEET
A polysaccharide of cartilage is

Options:
A chondroitin sulphate
B chondritin
C ossein
D cartilagin

The correct answer is:
chondroitin sulphate

Solution:
Chondroitin sulfate are sulfated glycosaminoglycans (GAG) and are the principal structural components of cartilages. These unbranched polysaccharides are composed of alternating sugars of glucuronic acid and N-acetylgalactosamine.

Topic: Biology, Structural Organisation in Animals, NEET
A population growing in a habitat with limited resources shows four phases of growth in the following sequence-

Options:
A Acceleration - Deceleration-Lag phase - Asymptote
B Asymptote - Acceleration - Deceleration - Lag phase
C Lag phase - Acceleration - Deceleration - Asymptote
D Acceleration - Lag phase - Deceleration - Asymptote

The correct answer is:
Lag phase - Acceleration - Deceleration - Asymptote

Solution:
A population growing in a habitat with limited resources shows initially a lag phase, followed by phases of acceleration and deceleration and finally an asymptote when the population density reaches carrying capacity.

Topic: Biology, Organisms and Populations, NEET
A population has a stable growth. The shape of the pyramid will be?

Options:
A Triangular
B Upright
C Urn-shaped
D Bell-shaped

The correct answer is:
Bell-shaped

Solution:
There are three types of age pyramids.

(a) TRIANGULAR: It is a graphic representation of a young or growing population which appears like a triangle. The population has a very high proportion of pre-reproductive individuals, proportionate numbers of reproductive individuals are moderate and post-reproductive individuals are proportionately fewer. Because of the very large number of pre-reproductive individuals, more and more of them enter the reproductive phase and rapidly increases the size of the population.
(b) BELL-SHAPED: The pyramid is bell-like with pre-reproductive individuals being only marginally more than the reproductive individuals. The population is said to be mature or stable as there is no increase or decrease in its size due to growth rate being almost zero.
(c) URN-SHAPED: It has a small number of pre-reproductive individuals followed by a large number of reproductive individuals. As there are fewer individuals in the pre-reproductive group, the population size will decline with time. Such a population shows a declined growth (negative growth).

Topic: Biology, Organisms and Populations, NEET
A population has more young individuals compared to older individuals. What would be the status of the population after some years?

Options:
A It will decline
B It will stabilise
C It will increase
D It will first decline and then stabilize

The correct answer is:
It will increase

Solution:
If a population has more young individuals compared to older individuals, it will increase.

Topic: Biology, Organisms and Populations, NEET
A population has more young individuals compared to the older individuals. What would be the status of the population after some years?

Options:
A It will decline
B It will stabilise
C It will increase
D It will first decline and then stabilise

The correct answer is:
It will increase

Solution:
A population with more members have more chances of making more progenies. This is due to the young individuals of the populations are in the reproductive age group. Thus, more young individuals in a group will lead to a greater number of births and increase the natality over mortality. Such population is considered to be expanding population and its population after some years will increase.

Topic: Biology, Organisms and Populations, NEET
A population is in Hardy-Weinberg equilibrium for a gene with only 2 alleles. If the gene frequency of an allele A is 0.7, the genotypic frequency of homozygous recessive individuals will be:

Options:
A 0.49
B 0.42
C 0.09
D 0.9

The correct answer is:
0.09

Solution:
Gene frequency of allele A=0.7 . That means âpâ=0.7 . According to Hardy-Weinberg equilibrium p+q=1 . Thus q=1-0.7=0.3
Hence, gene frequency of homozygous recessive q2=0.3Ã0.3=0.09

Topic: Biology, Evolution, NEET
A population is in Hardy-Weinberg equilibrium for a gene with only two alleles. If the gene frequency of an allele'A' is 0.7, genotype frequency of 'Aa' is

Options:
A 0.21
B 0.42
C 0.36
D 0.7

The correct answer is:
0.42

Solution:
For a gene that exists in two alleles, the Hardy-Weinberg equation states that p2+2pq+q2=1

fAA=p2 (genotype frequency of homozygotes)

fAa=2pq (genotype frequency of heterozygotes)

faa=q2 (genotype frequency of homozygotes)

If p = 0.7 and q=0.3, then

fAA=p2=0.72=0.49

Topic: Biology, Evolution, NEET
A population of a species invades a new area. Which of the following conditions will lead to adaptive radiation?

Options:
A Area with large number of habitats having very low food supply
B Area with a single type of vacant habitat
C Area with many types of vacant habitats
D Area with many habitats occupied by a large number of species

The correct answer is:
Area with many types of vacant habitats

Solution:
Option (c) is correct.
The adaptive radiation occurs when a population of a species invades a new area. It is because it provides organisms of a population a new habitat with plenty of niche spaces. Darwin's finches represent one of the best examples of this phenomenon.

Topic: Biology, Organisms and Populations, NEET, NEET 2019 (Odisha)
A population that exhibits birth rates that are identical to the death rate implies:

Options:
A Initial growth
B Plateau phase
C Acceleration phase
D Log phase

The correct answer is:
Plateau phase

Solution:
A population in which birth rate or number of birth during a given period in the population and the death rate or the number of death during a given period in a population are same then intrinsic growth rate of the population is zero and the population exhibits plateau phase.

Topic: Biology, Organisms and Populations, NEET
A population will not exist in Hardy-Weinberg equilibrium if:

Options:
A Individuals mate selectively
B There are no mutation
C There is no migration
D The population is large

The correct answer is:
Individuals mate selectively

Solution:
The Hardy-Weinberg principle says that allele frequencies in a population are stable and constant from generation to generation as long as

The population is large enough and changes in allele frequencies due to chance or accident are insignificant.

Mating occurs at random.

Mutation does not occur or if it does occur it must reach a state of equilibrium.

All the members of the population survive and have equal reproductive rates.

A population will not exist in Hardy-Weinberg equilibrium if the individuals mate selectively as the mating has to be random and influences like mutation, natural selection and genetic drift affect the equilibrium.

Topic: Biology, Evolution, NEET, NEET 2015 (Phase 1)
A positive charge enters in the region of transverse magnetic field as shown in figure. Velocity of charge is in such a way that charge passes through both inward and outward magnetic field regions, then possibly correct path of the charge is

Options:
A
B
C
D

The correct answer is:

Solution:
When it enters in first region then
Fâ=qVâ Ã Bâ
+veVâ Ã Bâ
Direction of Fâ will be as shown in figure.

Topic: Physics, Magnetic Effects of Current, NEET
A positive charge particle having charge q and mass m has velocity v → = v i ^ + k ^ 2 in the magnetic field B at the origin. Its speed as the function of y is :

Options:
A v 2 + qE 2 m y
B B E 2 + v 2 + qE 2 m y
C v 2 + 2 qE m y
D None of the above

The correct answer is:
v 2 + 2 qE m y

Solution:
Along y v y 2 = 2 × qE m × y
Net speed = v 2 + v y 2

Topic: Physics, Magnetic Effects of Current, NEET
A positive charge q is given to each plate of a parallel plate air capacitor having plate area A and plate separation d, then

Options:
A since both the plates are identically charged, therefore, capacitance becomes equal to zero
B energy stored in the space between the capacitor plates is equal to q2ε0A2
C no charge appears on inner surface of the plates
D potential difference between the plates is equal to 2qdε0A

The correct answer is:
no charge appears on inner surface of the plates

Solution:
Capacitance does not depend on charge on it, C=ε0Ad
In final charge distribution, Charge on outer plates q1=q4=q and inner plates q2=q3=0
As charge on inner plates are zero so there is no field between the plates and no potential difference and no energy is stored.

Topic: Physics, Electrostatics, NEET
A positive point charge is released from rest at a distance r0 from a positive line charge with uniform charge density. The speed (v) of the point charge, as a function of instantaneous distance r from line charge, is proportional to

Options:
A v∝rr0
B v∝ln⁡rr0
C v∝ln⁡rr0
D v∝e+rr0

The correct answer is:
v∝ln⁡rr0

Solution:
12mv2=q∆V
12mv2=q×λ2πε0ln⁡rr0
v2=qλmπε0ln⁡rr0
v=qλmπε0ln⁡rr0

Topic: Physics, Electrostatics, NEET
A positively charged ball hangs from a long silk thread. Electric field at a certain point (at the same horizontal level of ball) due to the ball is E. If now put a positive test charge q0 at this point and measure Fq0, then E

Options:
A >Fq0
B <Fq0
C =Fq0
D none of these

The correct answer is:
>Fq0

Solution:
E=kQr2 .....(i)

F=kQq0r12 ⇒ Fq0=kQr12 ....(ii)
As r1>r, so from equation (i) and (ii), we get E>Fq0

Topic: Physics, Electrostatics, NEET
A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire, is $\mathrm{k}$ volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3 , is plugged in, are found to be at lengths $\mathrm{l}_1 \mathrm{~cm}$ and $\mathrm{l}_2 \mathrm{~cm}$ respectively. The magnitudes, of the resistors $\mathrm{R}$ and $\mathrm{X}$, in ohm, are then, equal, respectively, to

Options:
A $\mathrm{k}\left(\mathrm{l}_2-\mathrm{l}_1\right)$ and $\mathrm{kl}_2$
B $\mathrm{kl}_1$ and $\mathrm{k}\left(\mathrm{l}_2-\mathrm{l}_1\right)$
C $\mathrm{k}\left(\mathrm{l}_2-\mathrm{l}_1\right)$ and $\mathrm{kl}_1$
D $\mathrm{kl}_1$ and $\mathrm{kl}_2$

The correct answer is:
$\mathrm{kl}_1$ and $\mathrm{k}\left(\mathrm{l}_2-\mathrm{l}_1\right)$

Solution:
The balancing length for $\mathrm{R}$ (when 1,2 are connected) be is $l_1$ and balancing length for $\mathrm{R}+\mathrm{X}$ (when 1,3 is connected is $\mathrm{l}_2$ )
Then $\quad \mathrm{iR}=\mathrm{kl}_1$
and $\mathrm{i}(\mathrm{R}+\mathrm{X})=\mathrm{kl}_2$
Given $\quad \mathrm{i}=1 \mathrm{~A}$
$$
\begin{array}{r}
\mathrm{R}=\mathrm{kl}_1 \\
\mathrm{R}+\mathrm{X}=\mathrm{kl}_2
\end{array}
$$
Subtracting Eq. (i) from Eq. (ii), we get
$$
\mathrm{X}=\mathrm{k}\left(\mathrm{l}_2-\mathrm{l}_1\right)
$$

Topic: Physics, Current Electricity, NEET, NEET 2010 (Screening)
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves:

Options:
A Cells
B Potential gradients
C A condition of no current flow through the galvanometer
D A combination of cells, galvanometer and resistances

The correct answer is:
A condition of no current flow through the galvanometer

Solution:
Reading of potentiometer is accurate because it doesn't draw any current from the circuit while measuring the voltages.

Topic: Physics, Current Electricity, NEET, NEET 2017
A potentiometer wire, 10 m long, has a resistance of 40 Î©. It is connected in series with a resistance box and a 2 V storage cell. If the potential gradient along the wire should be 0.1 mV cm-1, the resistance unplugged in the box is

Options:
A 260Â Î©
B 760 Î©
C 960Â Î©
D 1060Â Î©

The correct answer is:
760 Î©

Solution:
The potential gradient along the wire
=potential difference along wirelength of wire
or, 0.1×10−3=I×401000 V cm-1
or, Current in wire, I=1400 A
or, 240+R=1400 or R=800−40=760 Ω

Topic: Physics, Current Electricity, NEET
A potentiometer wire AB having length L and resistance 12r is joined to a cell D of emf Îµ and internal resistance r. A cell C having EMF Îµ/2 and internal resistance 3r is connected. The length AJ, at which the galvanometer, as shown in the figure, shows no deflection is

Options:
A 512L
B 1124L
C 1112L
D 1324L

The correct answer is:
1324L

Solution:
Potential difference across AJ=Ix,
=ε13r·12rL·x
For no current in galvanometer,
ε2= potential difference across AJ
ε2=12ε13Lx
x=13L24

Topic: Physics, Current Electricity, NEET
A potentiometer wire has length 4 m and resistance 8Ω . The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2V , so as to get a potential gradient 1 mV per cm on the wire is :

Options:
A 32 Ω
B 40 Ω
C 44 Ω
D 48 Ω

The correct answer is:
32 Ω

Solution:
dVdt = 1mVcm
For a potentiometer 1 cm of wire has 1 mV of voltage
So,
400 cm has 0.4V.
Given R must be connected in series
ΔV=0.4=28+R ×8
8+R=160.4=1604=40
⇒ R=32Ω

Topic: Physics, Current Electricity, NEET, NEET 2015 (Phase 1)
A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance r1 . An unknown e.m.f. E is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by:

Options:
A E0rr+r1.lL
B E0lL
C LE0rr+r1l
D LE0rl r1

The correct answer is:
E0rr+r1.lL

Solution:
K= potential gradient =E0rr+r11L
So E=Kl=E0rlr+r1L

Topic: Physics, Current Electricity, NEET, NEET 2015 (Phase 2)
A potted plant placed near the window bends outwardly due to

Options:
A Greater oxygen availability to the tip
B More auxin content on the shaded side
C Greater light availability to tip
D Availability of necessary warmth to the tip

The correct answer is:
More auxin content on the shaded side

Solution:
Greater growth of the shaded side of the stem is due to more accumulation of auxin on the shaded side than on the illuminated side.

Topic: Biology, Plant - Growth and Development, NEET
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns giving the output power at 230 V. If the current in the primary of the transformer is 5 A and its efficiency is 90 %, the output current would be:

Options:
A 45 A
B 50 A
C 20 A
D 25 A

The correct answer is:
45 A

Solution:
Efficiency η=0.9=PsPp
VsIs=0.9 × VpIp
Is= 0.9 ×2300 ×5230=45 A

Topic: Physics, Alternating Current, NEET
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5 A and its efficiency is 90 %, the output current would be:

Options:
A 35 A
B 25 A
C 50 A
D 45 A

The correct answer is:
45 A

Solution:
Efficiency n=90%
⇒0.9×power in=Power out
0.9×2300×5=230×Iout
Iout=45 A

Topic: Physics, Alternating Current, NEET
$A$ (Predominantly) is

Options:
A

B

C

D

The correct answer is:

Solution:
Key Idea : The mechanism of electrophilic addition reaction is consistent with the occurence of rearrangement leading to more stable carbocation. The order of stability of carbocation is as :

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2008 (Screening)
A pregnant female delivers a baby, who suffers from stunted growth, mental retardation low intelligence quotient and abnormal skin. This is the result of

Options:
A deficiency of iodine in diet
B low secretion of growth hormone
C cancer of the thyroid gland
D over secretion of pars distalis

The correct answer is:
deficiency of iodine in diet

Solution:
Hypothyroidism during pregnancy causes defective development and maturation of the growing foetus leading to stunted growth. Low secretion of GH results in stunted growth resulting in pituitary dwarfism. Pars distalis or anterior pituitary Produces Growth Hormone. prolactin $(\mathrm{PRL})$, Thyroid stimulating harmone (TSH), Adrenocorticatrophic Hormane (ACTH), Lutenising Hormone (LH) and Follicle Stimulating Hormone (FSH).

Topic: Biology, Chemical Coordination and Integration, NEET, NEET 2013 (All India)
A prism has a refracting angle of 60o. When placed in the position of minimum deviation, it produces a deviation of 30o. The angle of incidence is

Options:
A 30o
B 45o
C 15o
D 60o

The correct answer is:
45o

Solution:
i = A+δm2=60+302=45o

Topic: Physics, Ray Optics, NEET
A probe which is a molecule used to locate homologous sequences in a mixture of DNA or RNA molecules could be:

Options:
A An ssRNA
B An ssDNA
C Either RNA or DNA
D Can be ssDNA but not ssRNA

The correct answer is:
Either RNA or DNA

Solution:
A probe which is a molecule used to locate homologous sequences in a mixture of DNA or RNA molecules could be either RNA or DNA.

Topic: Biology, Biotechnology and Its Applications, NEET
A procedure in which sperm is directly injected into the ovum is

Options:
A ICSI
B Artificial insemination
C GIFT
D ZIFT

The correct answer is:
ICSI

Solution:
ICSI refers to the laboratory procedure where a single sperm is picked up with a fine glass needle and is injected directly into each egg.

Topic: Biology, Reproductive Health, NEET
A procedure in which sperm is directly injected into the ovum is

Options:
A ICSI (Intracytoplasmic sperm injection)
B Artificial insemination
C GIFT (Gamete intrafallopian tube transfer)
D ZIFT (Zygote intrafallopian tube transfer)

The correct answer is:
ICSI (Intracytoplasmic sperm injection)

Solution:
ICSI refers to the laboratory procedure where a single sperm is picked up with a fine glass needle and is injected directly into each egg.

Topic: Biology, Reproductive Health, NEET
A process in which the fitness of one species is significantly decreased in the presence of another species is

Options:
A mutualism
B proto-cooperation
C competition
D commensalism

The correct answer is:
competition

Solution:
Competition is defined as a process in which fitness of one species, measured in terms of its intrinsic rate of increase is significantly lower in the presence of another species.

Topic: Biology, Organisms and Populations, NEET
A process that involves the disintegration of complex organic matter from the body of dead animals and plants with the action of decomposers into inorganic raw material is called ____.

Options:
A Decomposition
B Recomposition
C Fertilization
D None of the above

The correct answer is:
Decomposition

Solution:
A process that involves the disintegration of complex organic matter from the body of dead animals and plants with the action of decomposers into inorganic raw material is called decomposition

Topic: Biology, Ecosystem, NEET
A process that makes important difference between $\mathrm{C}_3$ and $\mathrm{C}_4$ plants is

Options:
A transpiration
B glycolysis
C photosynthesis
D photorespiration

The correct answer is:
photorespiration

Solution:
Photorespiration is a light dependent process which occurs in $\mathrm{C}_3$ plants. It is opposite to photosynthesis because during this process, uptake of $\mathrm{O}_2$ and release of $\mathrm{CO}_2$ take place. Due to presence of Kranz anatomy, $C_4$ plants do not show photorespiration.

Topic: Biology, Photosynthesis in Higher Plants, NEET, NEET 2012 (Screening)
A process that makes important difference between C3 and C4 plants is :

Options:
A Transpiration
B Glycolysis
C Photosynthesis
D Photorespiration

The correct answer is:
Photorespiration

Solution:
C4 plants are special: They have a special type of leaf anatomy, they tolerate higher temperatures, they show a response to high light intensities, they lack a process called photorespiration and have greater productivity of biomass. Photorespiration is absent is C4 plants. Photorespiration does not produce energy or reducing power. Rather, it consumes energy. Further, it undoes the work of photosynthesis. There is 25% loss of fixed CO2. Therefore, photorespiration is a highly wasteful process. This happens only in case of C3 plants.

Topic: Biology, Photosynthesis in Higher Plants, NEET