datavorous/entrance-exam-dataset huggingface dataset:
A monkey climbs up a slippery pole for 3 seconds and subsequently slips for 3 seconds. Its velocity at time (t) is given by v(t) = 2t (3-t); 0< t < 3 and v (t)=–(t–3)(6–t) for 3 < t < 6 s It repeats this cycle until it reaches the height of 20 m.How many cycles (counting fractions) are required to reach the top?

Options:
A 5
B 6
C 6.5
D 7

The correct answer is:
6

Solution:
Correct Option is : (B)
6

Topic: Chemistry, Motion In One Dimension, NEET
A monkey of mass $20 \mathrm{~kg}$ is holding a vertical rope. The rope will not break when a mass of $25 \mathrm{~kg}$ is suspended from it but will break if the mass exceeds $25 \mathrm{~kg}$. What is the maximum acceleration with which monkey can climb up along the rope?

Options:
A $5 \mathrm{~m} / \mathrm{s}^2$
B $10 \mathrm{~m} / \mathrm{s}^2$
C $25 \mathrm{~m} / \mathrm{s}^2$
D $2.5 \mathrm{~m} / \mathrm{s}^2$

The correct answer is:
$2.5 \mathrm{~m} / \mathrm{s}^2$

Solution:
Let $T=$ tension in the rope when monkey climb up with an acceleration $a$.
Then $T-m g=m a$
$\begin{aligned}
& 25 g-20 g=20 a \\
& 5 g=20 a \\
& \Rightarrow a=\frac{5 \times 10}{20}=2.5 \mathrm{~m} / \mathrm{s}^2
\end{aligned}$

Topic: Physics, Laws of Motion, NEET, NEET 2003
A monoatomic gas γ=53 is suddenly compressed to 18 of its volume adiabatically then the pressure of the gas will change to.... times of initial pressure.

Options:
A 245
B 8
C 403
D 32

The correct answer is:
32

Solution:
P1V1Î³=P2V2Î³
P2=P1V1V2Î³=PV1V18Î³=P8r=P853=32 P

Topic: Physics, Thermodynamics, NEET
A monoatomic gas γ=53 is suddenly compressed to 18 of its volume adiabatically then the pressure of the gas will change to.... times of initial pressure

Options:
A 245
B 8
C 403
D 32

The correct answer is:
32

Solution:
P1V1γ=P2V2γ
P2=P1V1V2γ=PV1V18γ=P8r=P853=32P

Topic: Physics, Thermodynamics, NEET
A monoatomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is: (take γ=5/3)

Options:
A 64 P
B 32 P
C P/64
D 16 P

The correct answer is:
P/64

Solution:
Isothermally PV=P12V
P1=P2
Adiabatically
P22Vγ=Pf16Vγ
Pf=P212353
Pf=P212353=P225
Pf=p64

Topic: Physics, Thermodynamics, NEET, NEET 2014
A monoatomic ideal gas, initially at temperature T1, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T2 by releasing the piston suddenly. If L1 and L2 are the lengths of the gas column before and after expansion respectively, then T1T2 is given by

Options:
A L1/L22/3
B L1/L2
C L2/L1
D L2/L12/3

The correct answer is:
L2/L12/3

Solution:
During adiabatic expansion, we know TVÎ³-1=constant
or T1V1Î³-1=T2V2Î³-1
For a monoatomic gas, Î³ = 5 3
â´ T1T2=V2V2Î³-1=AL2AL15/3-1 (where A is the cross section area of the piston)
=L2L12/3

Topic: Physics, Thermodynamics, NEET
A monobasic acid of phosphorus, which reduces HgCl2 to balck Hg is

Options:
A hypophosphorus acid
B phosphoric acid
C metaphosphoric acid
D pyrophosphoric acid

The correct answer is:
hypophosphorus acid

Solution:
H3PO2 shows reducing properties.
H 3 PO 2 â+â4â HgCl 2 â+â2â H 2 Oâ2â Hg 2 Cl 2 â+â4âHClâ+â H 3 PO 4
2  Hg 2 Cl 2  +  H 3 PO 2  + 2  H 2 O→4 Hg + 4 HCl +  H 3 PO 4

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
A monocarpellary or multicarpellary, the syncarpous ovary develops into only one fruit. Such fruit is termed as

Options:
A simple fruit.
B multiple fruit.
C composite fruit.
D aggregate fruit.

The correct answer is:
simple fruit.

Solution:
When a single fruit develops from single flower having one or many syncarcpous ovary then it is called simple fruit. It can be dry or fleshy depending on the nature of fruit wall called pericarp.

Topic: Biology, Morphology of Flowering Plants, NEET
A monochromatic beam of width t is incident at 45Â° on an air-water surface. The refractive index of water is Î¼ . The width of the beam in water is,

Options:
A μ-1t
B μt
C μ 2 - 1 μ
D 2μ2-1μt

The correct answer is:
2μ2-1μt

Solution:
Snell's law,

sinâ¡45o=Î¼sinâ¡Î±

sinâ¡Î±=12 Î¼

cosÎ±= 2 Î¼ 2 â1 2 Î¼ ___(1)

From âABC, AC=2 t

From âADC,cosâ¡Î±=DCAC=t'2 t ___(2)

From (1) and (2)

2 Î¼2-12Î¼=t'2 tât'=(2 Î¼2-1)tÎ¼

Topic: Physics, Ray Optics, NEET
A monochromatic plane wave of speed c and wavelength λ is diffracted at a small aperture. The diagram illustrates successive wavefronts. After what time will some portion of the wavefront XY reach P?

Options:
A 3λ2c
B 2λc
C 3λc
D 4λc

The correct answer is:
3λc

Solution:
Distance between successive wave fringes is a wavelength λ .
So path difference from XY to P is 3λ
Time taken : 3λc

Topic: Physics, Wave Optics, NEET
A monochromatic ray of photons of energy 5 eV are incident on cathode. Electrons reaching the anode have kinetic energies varying from 6eV to 8eV. Choose the correct option.

Options:
A work function of the metal is 1 eV
B work function of the metal is 3 eV
C current in the circuit is equal to saturation value
D current in the circuit is less than saturation value.

The correct answer is:
current in the circuit is less than saturation value.

Solution:
KEmax=(5-Ï)eV

when these electrons are accelerated through 5V , they will reach the anode with maximum energy =(5 -Ï + 5)eV

10 - Ï = 8 Ï = 2eV

Current is less than saturation current because if slowest electron also reached the plate it would have 5 eV energy at the anode, but there it is given that the minimum energy is 6 eV.

Topic: Physics, Dual Nature of Matter, NEET
A monoclonal antibody differs from a polyclonal antibody in that monoclonal antibodies:

Options:
A are labeled with chemicals that can be visualized.
B are produced by cells from the same organism that produced the antigen.
C are synthesized by a population of identical, or "cloned," cells.
D are synthesized only in living organisms.

The correct answer is:
are synthesized by a population of identical, or "cloned," cells.

Solution:
A monoclonal antibody differs from a polyclonal antibody in that monoclonal antibodies are synthesized by a population of identical, or "cloned," cells through hybridoma technology.

Topic: Biology, Human Health and Diseases, NEET
A more accurate measure of biomass will be in terms of

Options:
A Dry weight
B Fresh weight
C Both (a)  and  (b)
D Detritus

The correct answer is:
Dry weight

Solution:
The standing crop is measured as the mass of living organism or biomass. The biomass of a species is expressed in terms of fresh weight or dry weight. Measurement of biomass in terms of dry weight is more accurate as fresh weight shows more seasonal variation.

Topic: Biology, Ecosystem, NEET
A more ape-like form was observed in __________________, while ___________________ was more man-like.

Options:
A Dryopithecus and Ramapithecus
B Ramapithecus and Java man
C Java man and Peking man
D Neanderthal man and Cro-magnon man

The correct answer is:
Dryopithecus and Ramapithecus

Solution:
About 15 million years ago, primates called Dryopithecus and Ramapithecus existed. They were hairy and walked like gorillas and chimpanzees.

Topic: Biology, Evolution, NEET
A mosquito borne viral disease is

Options:
A malaria and chagas disease
B yellow fever and dengue
C filariasis and typhus
D kala-azar and diphtheria

The correct answer is:
yellow fever and dengue

Solution:
Mosquito-borne diseases are caused by bacteria, viruses, and protozoans. Mosquitoes act as a vector. Viral infections carried by mosquitoes include dengue fever, chikungunya, yellow fever, zika infection, etc. Dengue and yellow fever are caused by a flavivirus. chikungunya by chikungunya virus and zika by zika virus,

Topic: Biology, Human Health and Diseases, NEET
A mosquito with 8 legs stands on water surface and each leg makes depression of radius a . If the surface tension and angle of contact are T and zero respectively ,then the weight of mosquito is

Options:
A 8 Ta
B 16πTa
C Ta8
D Ta16π

The correct answer is:
16πTa

Solution:
Figure shows one of the legs of the mosquito landing upon the water surface.
Therefore, T.2πa×8=W= weight of the mosquito.
T.16πa=W

Topic: Physics, Mechanical Properties of Fluids, NEET
A mother in a family of five daughters is expecting her sixth baby. The chance of its being a son is

Options:
A Zero
B 25%
C 50%
D 100%

The correct answer is:
50%

Solution:
Humans have 22 pairs of autosomes and 1 pair of sex chromosomes which are XX in females and XY in males. So, everytime the chances of son or daughter is 50-50% depending upon which sex chromosome is contributed by father in sperm.

Topic: Biology, Principles of Inheritance and Variation, NEET
A motion is described by y=4exe-5t, where y, x are in metres and t is in second.

Options:
A This represents progressive wave propagating along –x-direction with 5 m s-1
B This represents progressive wave propagating along + x-direction with 5 m s-1
C This does not represent progressive wave.
D This represents standing wave.

The correct answer is:
This represents progressive wave propagating along + x-direction with 5 m s-1

Solution:
∵y=4exe-5t (given)
=4ex-5t
∵ It is a form of y=fax±bt
So, it represents a progressive wave, propagating in positive x-axis direction because coefficients of x and coefficient of t have opposite sign.
∵ Speed of a wave, v=Coefficient of tCoefficient of x=51=5 m s-1

Topic: Physics, Waves and Sound, NEET
A motor car is approaching towards a crossing with a velocity of 72 km h-1. The frequency of the sound of its horn as heard by a policeman standing on the crossing is 260 Hz. The frequency of horn is

Options:
A 200 Hz
B 244 Hz
C 150 Hz
D 80 Hz

The correct answer is:
244 Hz

Solution:
From Doppler's effect, perceived frequency is
ν′=νv-vov-vs
vs=72 km h-1=72×100060×60=20 m s-1
vo=0, v=332 m s-1, ν′=260 Hz
260=ν332332-20
⟹ν=260×312332=244 Hz

Topic: Physics, Waves and Sound, NEET
A motor pump lifts 6 tonnes of water from a height of 25 m to a height 35 m from the ground floor in 20 seconds. The power of the pump (in kW) is g=10 m s-2

Options:
A 3
B 12
C 1.5
D 6

The correct answer is:
3

Solution:
Given,
Height of first floor h=35 m
Time t=20 min
We know that,
P=worktime
P=mght âµwork=mgh
=600Ã10Ã35-2520
=600Ã10Ã1020
=60002=3000 W=3 kW

Topic: Physics, Work Power Energy, NEET
A motorboat covers a given distance in 6 h moving downstream of a river. It covers the same distance in 10 h moving upstream. The time (in hour) it takes to cover the same distance in still water is

Options:
A 6
B 7.5
C 10
D 15

The correct answer is:
7.5

Solution:
Let vw be velocity of water and vb be the velocity of motor boat in still water. If x is the distance covered, then as per question
x=vb+vwÃ6=(vb-vw)Ã10
On solving, vâ¡ wâ¡ = vâ¡ bâ¡ / 4
â´ xâ¡ = vâ¡ bâ¡ + vâ¡ bâ¡ / 4 Ã 6 = 7.5 vâ¡ bâ¡
Time taken by motor boat to cross the same distance in still water is
t= x v b 7.5 v b v b =7.5ââh

Topic: Physics, Motion In One Dimension, NEET
A motorboat is racing towards north at 25 km/h and the water current in that region is 10 km/h in the direction of 60° east of south. Find the resultant velocity of the boat.

Options:
A 18 km/h
B 22 km/h
C 26 km/h
D 32 km/h

The correct answer is:
22 km/h

Solution:
Correct Option is : (B)
22 km/h

Topic: Chemistry, Motion In Two Dimensions, NEET
A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be

Options:
A 0.8
B 0.25
C 0.5
D 0.4

The correct answer is:
0.25

Solution:
By conversation of linear momentum
mv=4mv′⇒v′=v4
Coefficient of restitution ( e ) =Velocity of separationVelocity of approach
= v4-0v-0=14=0.25

Topic: Physics, Center of Mass Momentum and Collision, NEET, NEET 2018
A moving positron and electron both with kinetic energy 1 MeV annihilate with each other and emits two gamma photons. If the rest mass energy of an electron is 0.51 MeV, the wavelength of each photon is ?

Options:
A 5.1×10−3Å
B 10.2×10−3Å
C 8.2Ã10â3Ã
D 6.2×10−3Å

The correct answer is:
8.2×10−3Å

Solution:
Energy released in annihilation =0.51+0.51=1.02 MeV

Initial energy =1+1=2 MeV .

Therefore, the energy of the two photons is =1.02+2=3.02 MeV . Hence energy of each photon is E=1.51 MeV . Now, according to Duane-Hunt law, the wavelength of a photon of energy E(in eV) is given by

λ=hcEineV Å=6.62×10−34×3×1081.51×106 Å

=8.2×10−3 Å

Topic: Physics, Nuclear Physics, NEET
A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has

Options:
A Haploid vegetative cells and diploid gametangia
B Diploid vegetative cells and diploid gametangia
C Diploid vegetative cells and haploid gametangia
D Haploid vegetative cells and haploid gametangia

The correct answer is:
Haploid vegetative cells and haploid gametangia

Solution:
Adult filament of a multicellular, filamentous alga have haplontic life cycle in which the meiotic division occurs after the formation of zygote. So, the filament of this alga have haploid vegetative cells and haploid gametangia.

Topic: Biology, Plant Kingdom, NEET
A mutation at one base of the first codon of a gene forms a non-functional protein. It is called a:

Options:
A Nonsense mutation
B Reverse mutation
C Frameshift mutation
D Missense mutation

The correct answer is:
Missense mutation

Solution:
A point mutation in which a change of a single nucleotide results in a codon for a different amino acid is called a missense mutation. Change in the first base of a codon results in a change in the entire codon as genetic code is degenerate in nature. Due to this, the amino acid changes and so does the nature of the entire protein.

Topic: Biology, Principles of Inheritance and Variation, NEET
A myopic adult has a far point at 0.1 m. His power of accommodation is 4 diopters. What is his near point without glasses?

Options:
A 0.06 m
B 0.07 m
C 0.08 m
D 0.09 m

The correct answer is:
0.07 m

Solution:
Correct Option is : (B)
0.07 m

Topic: Chemistry, Ray Optics, NEET
A myopic adult has a far point at 0.1 m. His power of accommodation is 4 diopters. What power lenses are required to see distant objects?

Options:
A +10 D
B -10 D
C +4 D
D -4 D

The correct answer is:
-10 D

Solution:
Correct Option is : (B)
-10 D

Topic: Chemistry, Ray Optics, NEET
A+NaNO2→N2O+NaCl+2H2O, In this reaction A can be

Options:
A H2SO4 dil.
B H3PO4
C NH2OH.HCl
D dil. HCl

The correct answer is:
NH2OH.HCl

Solution:
Here A is NH2OH.HCl
NH2OH.HCl+NaNO2→N2O+NaCl+2H2O

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
A $~n-p-n$ transistor conducts when:

Options:
A both collector and emitter are positive with respect to the base
B collector is positive and emitter is negative with respect to the base
C collector is positive and emitter is at same potential as the base
D both collector and emitter are negative with respect to the base

The correct answer is:
collector is positive and emitter is negative with respect to the base

Solution:
In active region
Emitter base $p-n$ function is in FB and base collector $p-n$ function is in RB.

Topic: Physics, Semiconductors, NEET, NEET 2003
A n-p-n transistor is connected in common emitter configuration in which collector voltage drop across load resistance (800 Ω) connected to the collector circuit is 0.8 V. The collector current is

Options:
A 2 mA
B 0.1 mA
C 1 mA
D 0.2 mA

The correct answer is:
1 mA

Solution:
The voltage drop across load resistance=0.8 V, then from the idea of Ohm's law the current flowing through the collector is,

IC=VCRC=0.8800=10-3 A=1 mA.

Topic: Physics, Semiconductors, NEET, NEET 2020 (Phase 2)
A narrow slit of width 1 mm is illuminated by monochromatic light of wavelength 600 nm . The distance between the first minima on either side on a screen at a distance of 2 m is

Options:
A 1.2 cm
B 1.2 mm
C 2.4 cm
D 2.4 mm

The correct answer is:
2.4 mm

Solution:
2θ=2×λd=2×600×10-91×10-3;
So 2x=D2θ=2×600×10-910-3=2.4 mm

Topic: Physics, Wave Optics, NEET
A narrow slit of width 1 mm is illuminated by monochromatic light of wavelength 60 nm. The distance between the first minima on either side of a screen at a distance of 2 m is

Options:
A 1.2 cm
B 1.2 mm
C 2.4 cm
D 2.4 mm

The correct answer is:
2.4 mm

Solution:
For first dark fringe on either side dsin⁡θ=λ or dyD=λ
∴ y=λDd
Therefore distance between two dark fringes on either side =2y=2λDd
Substituting that values, we have
Distance =2600×10-6 mm2×103 mm1.0 mm=2.4 mm

Topic: Physics, Wave Optics, NEET
A natural system of classification based on natural affinities among the organisms, including external and internal features, was given by

Options:
A Aristotle
B Linnaeus
C Bantham and Hooker
D Engler and Prantle

The correct answer is:
Bantham and Hooker

Solution:
The natural classification of plants is based on the external (or morphological) features and internal features (ultrastructure, anatomy, embryology and biochemistry). The classification of angiosperms is given by George Bentham and Joseph Dalton Hooker. These two English botanists classified plants based on original studies of specimens. They published their well-known scheme of classification in a book Genera plantarum. Especially from the practical point of view, this system of classification is still regarded as the best classification system.

Topic: Biology, The Living World, NEET
A naturally occurring coding strand composed of alternating C and U residues would result in the formation of

Options:
A A polypeptide containing alternating leu and ser residues
B A polypeptide containing either leu or ser residues
C A polypeptide containing only leu residues
D A polypeptide containing only ser residues

The correct answer is:
A polypeptide containing alternating leu and ser residues

Solution:
Because CUC and UCC code for respectively Leucine and Serine.

Topic: Biology, Molecular Basis of Inheritance, NEET
A negatively charged sol can be formed by peptizing a solution of

Options:
A Agl with AgNO3
B Agl with Kl
C Fe(OH)3 with FeCl3
D Any of these

The correct answer is:
Agl with Kl

Solution:
When Kl is added to Agl it would increase the concentration of I- which is the negative part of the colloid and hence will give negatively charged colloidal particle

Topic: Chemistry, Surface Chemistry, NEET
A nematode Meloidogyne incognita infects the roots of tobacco plants and causes a great reduction in yield. A novel strategy was adopted to prevent this infestation which was based on the process of

Options:
A RNAi
B mRNA silencing
C Anti-sense RNA technology
D All of these

The correct answer is:
All of these

Solution:
Several nematodes parasitize a wide variety of plants and animals including human beings. A nematode Meloidogyne incognita infects the roots of tobacco plants and causes a great reduction in yield. A novel strategy was adopted to prevent this infestation which was based on the process of RNA interference (RNAi). RNAi takes place in all eukaryotic organisms as a method of cellular defense. This method involves the silencing of a specific mRNA due to a complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing). The source of this complementary RNA could be from infection by viruses having RNA genomes or mobile genetic elements (transposons) that replicate via an RNA intermediate. Using Agrobacterium vectors, nematode-specific genes were introduced into the host plant. The introduction of DNA was such that it produced both sense and anti-sense RNA in the host cells. These two RNAâs being complementary to each other formed a double-stranded (dsRNA) that initiated RNAi and thus, silenced the specific mRNA of the nematode.

Topic: Biology, Biotechnology and Its Applications, NEET
A neon-dioxygen mixture contains 70.6 g dioxygen and 167.5 g neon. If pressure of the mixture of gases in the cylinder is 25 bar. What is the partial pressure of dioxygen and neon in the mixture?

Options:
A Partial pressure of Oxygen = 19.75 bar , Partial pressure of Neon = 5.25 bar
B Partial pressure of Oxygen = 5.84 bar , Partial pressure of Neon = 21.54 bar
C Partial pressure of Oxygen = 24.56 bar , Partial pressure of Neon = 4.68 bar
D Partial pressure of Oxygen = 5.25 bar , Partial pressure of Neon = 19.75 bar

The correct answer is:
Partial pressure of Oxygen = 5.25 bar , Partial pressure of Neon = 19.75 bar

Solution:
Correct Option is : (D)
Partial pressure of Oxygen = 5.25 bar , Partial pressure of Neon = 19.75 bar

Topic: Chemistry, States of Matter, NEET
A network of four 10 mF capacitors is connected to a 500 V supply, as shown in Fig. Determine the equivalent capacitance of the network

Options:
A 14.9uF
B 13.3uF
C 15.4uF
D 16.7uF

The correct answer is:
13.3uF

Solution:
Correct Option is : (B)
13.3uF

Topic: Chemistry, Capacitance, NEET
A network of four capacitors capacity equal $C_1=C, C_2=2 C, C_3=3 C$ and $C_4=$ $4 C$ are conducted to a battery as shown in the figure. The ratio of the change on $C_2$ and $C_4$ is:

Options:
A $\frac{4}{7}$
B $\frac{3}{22}$
C $\frac{7}{4}$
D $\frac{22}{3}$

The correct answer is:
$\frac{3}{22}$

Solution:
Here $C_1, C_2$ and $C_3$ are in series.
$$
\frac{1}{C^{\prime}}=\frac{1}{C}+\frac{1}{2 C}+\frac{1}{3 C}
$$
$$
\begin{aligned}
\frac{1}{C^{\prime}} & =\frac{6+3+2}{6 C}=\frac{11}{6 C} \\
\Rightarrow \quad C & =\frac{6 C}{11}
\end{aligned}
$$
All the capacitors in branch number 1 is in series so the charge on each number capacitor is:
$$
Q^{\prime}=\frac{6}{11} C V
$$
Also charge on capacitor $C_4$ is $Q=4$ V
$$
\therefore \text { Ratio }=\frac{Q^{\prime}}{Q}=\frac{6 \mathrm{CV}}{11 \times 4 C V}=\frac{3}{22}
$$

Topic: Physics, Capacitance, NEET, NEET 2005
A neural canal is

Options:
A A central hollow portion through which the spinal cord passes.
B A canal filled with pericardial fluid.
C A hollow canal present in bone.
D None of these

The correct answer is:
A central hollow portion through which the spinal cord passes.

Solution:
Each vertebra has a central hollow portion (neural canal) through which the spinal cord passes. It is a lumen (cavity) of the neural tube lined by ependymal cells.

Topic: Biology, Locomotion and Movement, NEET
A neutron beam of energy E scatters from atoms on a surface with a spacing d = 0.1nm. The first maximum of intensity in the reflected beam occurs at θ = 30°. What is the kinetic energy E of the beam in eV?

Options:
A 0.21 eV
B 0.42 eV
C 0.63 eV
D 0.84 eV

The correct answer is:
0.21 eV

Solution:
Correct Option is : (A)
0.21 eV

Topic: Chemistry, Dual Nature of Matter, NEET
A neutron is absorbed by a 3 6 Li nucleus with the subsequent emission of an alpha particle.

L36i+n01âH24e+H13+Q

Calculate the energy released, in MeV, in this reaction.

[Given: mass 36Li=6.015126âu; mass (neutron) =1.0086654 u;

Mass (alpha particle) =4.0026044 u and

Mass (tritium) =3.0100000 u.

[ Take 1 u=931 MeV c-2 ]

Options:
A

10.92 MeV

B

10.415 MeV

C

9.791 MeV

D

8.73 MeV

The correct answer is:

10.415 MeV

Solution:
L36i+n24âH24e+H13+Q

Total initial mass =6.015126+1.0086654

=7.0237914âamu

Total final mass =4.0026044+3.01

=7.0126044âamu

Mass defect, Îm=7.0237914â7.0126044

=0.0111870âamu

Energy released, Q=0.0111870Ã931

=10.415 MeV.

Topic: Physics, Nuclear Physics, NEET
A neutron is moving with velocity u. It collides head-on and elastically with an atom of mass number A. If the initial kinetic energy of the neutron is E, then how much kinetic energy will be retained by the neutron after reflection?

Options:
A AA+12E
B AA+12 E
C A-1A+12E
D A -1A+12 E

The correct answer is:
A-1A+12E

Solution:
The fraction of total retained by nucleus
( Δk k ) retained = ( m 2 − m 1 m 1 + m 2 ) 2 = ( A−1 A+1 ) 2
Kinetic energy retained by neutron after collision is A-1A+12E.

Topic: Physics, Nuclear Physics, NEET
A new crop, that is the source of a high-performance lubricants is

Options:
A Simmondsia chinensis
B Parthenium argentatum
C Psophocarpus tetragonolobus
D Leucaena leucocephala

The correct answer is:
Simmondsia chinensis

Solution:
Simmondsia chinensis (Jojoba) seed has 50% liquid wax, that can be used as a high-performance lubricant for machinery involving pressure but not temperature changes.

Topic: Biology, Biodiversity and its Conservation, NEET