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Test: NEET 2020 Past Year Paper - Question 1

For transistor action, which of the following statements is correct?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 1

For a transistor action, the base junction must be lightly doped so that the base region is very thin.

Test: NEET 2020 Past Year Paper - Question 2

A spherical conductor of radius 10 cm has a charge of 3.2 × 10-7 C distributed uniformly. what is the magnitude of electric field at a point 15 cm from the centre of the sphere ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 2



E = 1.28 ×105 N/C

Test: NEET 2020 Past Year Paper - Question 3

Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2m is:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 3


Δθmin = 3.66 × 10-7 rad

Test: NEET 2020 Past Year Paper - Question 4

Dimensions of stress are :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 4

Test: NEET 2020 Past Year Paper - Question 5

A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 5

Least Count =
= 0.01 = pitch / 50
Pitch = 0.01 × 50  = 0.5 mm

Test: NEET 2020 Past Year Paper - Question 6

Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 6



Test: NEET 2020 Past Year Paper - Question 7

An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is 1.227 × 10–2 nm, the potential difference is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 7

For e, according to de-broglie's wavelength

= 1.227 × 10–2 × 10–9

Test: NEET 2020 Past Year Paper - Question 8

In a certain region of space with volume 0.2 m3, the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 8

given v = const. (5 volt)

E = 0

Test: NEET 2020 Past Year Paper - Question 9

A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C. Its density is : (R = 8.3 J mol–1 K–1)

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 9

From ideal gas equation
∴ PV = nRT

∴ m = rV

Test: NEET 2020 Past Year Paper - Question 10

The mean free path for a gas, with molecular diameter d and number density n can be expressed as :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 10

The mean free path for gas is given by

Test: NEET 2020 Past Year Paper - Question 11

A ball is thrown vertically downward with a velocity of 20m/s from the top of a tower. It hits the ground after some time with a velocity of 80m/s. The height of the tower is : ( g= 10m/s2)

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 11

v2 – u2 = 2as
(80)2  – (–20)2 = 2(–10) × s
6400 – 400 = 2 × (–10) × s
- 6000 / 20 = s
s = – 300 m
Height of tower h = 300 m

Test: NEET 2020 Past Year Paper - Question 12

For the logic circuit shown, the truth table is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 12


= A.B (using de-Morgan's rule)
∴ A B y = A.B
   0 0 0
   0 1 0
   1 0 0
   1 1 1

Test: NEET 2020 Past Year Paper - Question 13

A short electric dipole has a dipole moment of 16×10–9 C m. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60° with the dipole axis is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 13

Test: NEET 2020 Past Year Paper - Question 14

A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 14


= m = ρ × volume = ρ × h × pr2 = = 5 gm
r’ = 2r

= ρ × hpr2 × 2 = 10 gm

Test: NEET 2020 Past Year Paper - Question 15

which of the following graph represents the variation of resistivity (ρ) with temperature (T) For copper ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 15

Relation between resistivity and temperature is given by
ρ = ρ0e-αT

Test: NEET 2020 Past Year Paper - Question 16

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : (c = speed of electromagnetic waves)

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 16

Energy distribution is same so ration of electric field and magnetic field will be 1 : 1

Test: NEET 2020 Past Year Paper - Question 17

A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is : (μ0 = 4π×10-7 Tm A-1)

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 17

Magnetic field for solenoid is given by
B = μ0 nI
(n = N/ℓ) 
= 4π × 10-7 × 200 × 2.5

= 4 × 3.14 × 10–7 × 500
= 2000 × 3.14 × 10–7
= 6.14 × 10–4 T

Test: NEET 2020 Past Year Paper - Question 18

For which one of the following, Bhor model is not valid?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 18

Bohr Model is valid only for those atoms which have one electron in orbit.

Test: NEET 2020 Past Year Paper - Question 19

The energy equivalent of 0.5 g of a substance is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 19

E = Δmc2 = 0.5 × 10-3 × (3×108)2
= 0.5 ×10-3 × 9 ×1016
E = 4.5 ×1013 J

Test: NEET 2020 Past Year Paper - Question 20

Taking into account of the significant figures, what is the value of 9.99 m–0.0099 m?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 20


As per rule
least no. of place in decimal portion of any number

Test: NEET 2020 Past Year Paper - Question 21

In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 Hz, the original frequency of B will be :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 21

Frequency of A = fA = 530 Hz, fB = ?
|fA – fB | = 6, given


So fB = 524 Hz

Test: NEET 2020 Past Year Paper - Question 22

A series LCR circuit is connected to an AC voltage source. When L is removed from the circuit, the phase difference between current and voltage is π / 3 . If instead C is removed from the circuit, the phase difference is again π / 3 between current and voltage. The power factor of the circuit is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 22

When inductor alone is removed,

XC = R √3

When capacitor alone is removed,

Thus, for the original circuit,

X = R √3 = X
= XL = XC ⇒ (Z = R)

power factor =

Test: NEET 2020 Past Year Paper - Question 23

The quantities of heat required to raise the temperature of two solid copper spheres of radii r1 and r2  (r1 = 1.5 r2) through 1 K are in the ratio :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 23

Q = msΔT  s is same as material is same

Test: NEET 2020 Past Year Paper - Question 24

The Brewster’s angle ib for an interface should be :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 24


μ = tan (ib)
ib =  tan-1 (μ)
(μ > 1)
ib > 45
45 < ib < 90°

Test: NEET 2020 Past Year Paper - Question 25

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 25

For the thermally insulated system,
dQ = 0
and when cock remove
dw = 0

(because in vacuum dw = 0)
dQ = du + dw
So du also zero.
Following are the essential conditions for the adiabatic process to take place. The system must be perfectly insulated from the surrounding. The process must be carried out quickly so that there is a sufficient amount of time for heat transfer to take place.
According to question both conditions satisfied so process will be adiabatic.

Test: NEET 2020 Past Year Paper - Question 26

An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A m-1 . The permeability of the material of the rod is : (μ0 = 4π×10-7 T mA-1)

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 26

xm = 599, μ0 = 4p × 10-7
H = 1200 A/m, μ = ?
μ = μ0 (1 + xm)
= 4π × 10-7 (1 + 599)
= 4π × 10-7 × 600
= 24π × 10-5
m = 2.4π × 10-4 TmA-1

Test: NEET 2020 Past Year Paper - Question 27

The capacitance of a parallel plate capacitor with air as medium is 6 mF. With the introduction of a dielectric medium, the capacitance becomes 30 mF. The permittivity of the medium is : (ε= 8.85 × 10-12 C2 N-1 m-2)

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 27


Cmed = KCair
30μF = K6μF
K = 5
∴ ε = ε0k = 8.85 × 10-12 × 5
ε = 44.25 × 10-12
ε = 0.4425 × 10-10
ε = 0.44 × 10-10 C2N-1m-2

Test: NEET 2020 Past Year Paper - Question 28

A charged particle having drift velocity of 7.5×10-4 ms-1 in an electric field of 3×10-10 Vm-1 has a mobility in m2 V-1 s-1 of :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 28



μ = 2.5 × 106
(μ = mobility)

Test: NEET 2020 Past Year Paper - Question 29

The color code of a resistance is given below:

The values of resistance and tolerance, respectively, are :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 29



R = 47 × 101Ω ± 5%
   = 470 Ω ± 5%
So, 470, 5%

Test: NEET 2020 Past Year Paper - Question 30

The solids which have the negative temperature coefficient of resistance are :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 30

Insulators have a negative temperature coefficient because as temperature increases, the resistance of insulators decreases. The resistivity of the semiconductor material to decrease with the rise in temperature, resulting in a negative temperature coefficient of resistance.

Test: NEET 2020 Past Year Paper - Question 31

A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 31


Test: NEET 2020 Past Year Paper - Question 32

A 40 μF capacitor is connected to a 200 V, 50 Hz ac supply. The rms value of the current in the circuit is, nearly:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 32


= 200 × 2 × 3.14 × 50 × 40 × 10–6
Irms = 251.2 × 10–2 ≈ 2.5 A

Test: NEET 2020 Past Year Paper - Question 33

The phase difference between the displacement and acceleration of a particle in a simple harmonic motion is:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 33

for SHM acceleration and displacement both must have opposite direction
a = –ω2x  ∴ phase diff. is π
∴ x = A sin (ωt), a = -Aω2sinωt

Test: NEET 2020 Past Year Paper - Question 34

The average thermal energy for a mono-atomic gas is : (kB is Boltzmann constant and T, absolute temperature)

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 34

by theory
for monoatomic gas average thermal energy =

Test: NEET 2020 Past Year Paper - Question 35

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 35

f0 < f1 = 1.5 f0
∴ f2 = 0.75 f0
for given condition
fincident< fthreshold

so no photo electron emission
i = 0

Test: NEET 2020 Past Year Paper - Question 36

A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L1 when mass M is suspended from its free end. The expression for Young's modulus is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 36

from young’s modulus formula

Test: NEET 2020 Past Year Paper - Question 37

A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is m, then the angle of incidence is nearly equal to:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 37


1 sin i = μ. sin A
for small angle approximation
sin θ = θ
i = μA

Test: NEET 2020 Past Year Paper - Question 38

Find the torque about the origin when a force ofN acts on a particle whose position vector is m.

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 38


Test: NEET 2020 Past Year Paper - Question 39

In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 39

 Fringe width in YDSE is given by

Test: NEET 2020 Past Year Paper - Question 40

The energy required to break one bond in DNA is 10–20J. This value in eV is nearly:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 40

1.6 × 10–19 Joule = 1 eV
1 Joule = 
∴ 10-20 Joule =

Test: NEET 2020 Past Year Paper - Question 41

When a uranium isotope is bombarded with a neutron, it generates , three neutrons and :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 41


92 = 36 + Z;  = 235 ⇒ A = 144
Z = 56

Test: NEET 2020 Past Year Paper - Question 42

Two particles of mass 5kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1m with negligible mass. The centre of mass of the system from the 5kg particle is nearly at a distance of:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 42


= 0.67 m = 67 cm

Test: NEET 2020 Past Year Paper - Question 43

Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 43

Energy / sec = 20 w/cm2 × 20 cm2
= 400 w
∴ in 1 minute = 400 × 60
= 24000

Test: NEET 2020 Past Year Paper - Question 44

The increase in the width of the depletion region in a p-n junction diode is due to:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 44

The increase in the width of the depletion region in a p-n junction diode is due to reverse bias only.

Test: NEET 2020 Past Year Paper - Question 45

A resistance wire connected in the left gap of a metre bridge balances a 10 Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1Ω of the resistance wire is:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 45


x × 2λ = 10 × 3 λ
x = 15Ω
∴ 15Ω → 1.5 m
∴ 1Ω → 1.5 / 15
= 1 x 10-1 m

Test: NEET 2020 Past Year Paper - Question 46

Identify compound X in the following sequences of reactions :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 46

Test: NEET 2020 Past Year Paper - Question 47

Identify a molecule which does not exist.

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 47

Diatomic molecule for which bond order is zero or negative does not exist.

Test: NEET 2020 Past Year Paper - Question 48

Which of the following is a natural polymer ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 48

Test: NEET 2020 Past Year Paper - Question 49

An increase in the concentration of the reactants of a reaction leads to change in :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 49

Collision frequency, as number of molecules per unit volume increases.

Test: NEET 2020 Past Year Paper - Question 50

Anisole on cleavage with HI gives :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 50

Test: NEET 2020 Past Year Paper - Question 51

The number of protons, neutrons and electrons in , respectively, are :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 51


∴ no. of protons = 71
no. of neutrons = 175 – 71 = 104
no. of electrons = 71

Test: NEET 2020 Past Year Paper - Question 52

The calculated spin only magnetic moment of Cr2+ ion is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 52

Cr2+ → 1s2 2s2 2p6 3s2 3p6 3d4
∴ n (number of unpaired electrons) = 4
∴ μ 

= 4.8989
= 4.9 B.M.

Test: NEET 2020 Past Year Paper - Question 53

Match the following :

Which of the following is correct option ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 53

Test: NEET 2020 Past Year Paper - Question 54

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

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 54


Test: NEET 2020 Past Year Paper - Question 55

Match the following and identify the correct option.

Select the correct option:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 55

Correct Answer :- C [a(iii) b(i) c(ii) d(iv)]

Explanation : a) Syngas, or synthesis gas, is a fuel gas mixture consisting primarily of hydrogen, carbon monoxide, and very often some carbon dioxide. ... Syngas is usually a product of coal gasification and the main application is electricity generation. 

b) Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate). The presence of the metal cations makes the water hard.

c) Traditionally, diborane has often been described as electron-deficient, because the 12 valence electrons can only form 6 conventional 2-centre 2-electron bonds which are insufficient to join all 8 atoms.

d) Hydrogen peroxide (H2O2) is a nonplanar molecule with (twisted) symmetry. It is non–linear, non–planar molecule with a open book structure. The –O–O– linkage is called peroxy linkage.

Test: NEET 2020 Past Year Paper - Question 56

The mixture which shows positive deviation from Raoult’s law is :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 56

Acetone + ethanol shows positive deviation from Raoult’s law. Pure ethanol possesses H-bonding and adding acetone to ethanol causes breaking of some H-bonds. This causes increase in observed vapour pressure.

Test: NEET 2020 Past Year Paper - Question 57

The freezing point depression constant (Kf) of benzene is 5.12 K kg mol–1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 57

ΔTf = ikfm
⇒ ΔTf = 1 × 5.12 × 0.078
ΔTf = 0.3993
ΔTf = 0.40 K

Test: NEET 2020 Past Year Paper - Question 58

Which of the following set of molecules will have zero dipole moment ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 58

Test: NEET 2020 Past Year Paper - Question 59

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 59

Test: NEET 2020 Past Year Paper - Question 60

Find out the solubility of Ni(OH)2 in 0.1 M NaOH. Given that the ionic product of Ni(OH)2 is 2×10–15.

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 60


∴ Ksp = [Ni2+] [OH]2
⇒ ksp = s × (0.1)2

⇒ s = 2 × 10–13 M

Test: NEET 2020 Past Year Paper - Question 61

Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 61

Test: NEET 2020 Past Year Paper - Question 62

Which of the following amine will give the carbylamine test?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 62


Carbylamine reaction is give by 1° amine & aniline.

Test: NEET 2020 Past Year Paper - Question 63

An alkene on ozonolysis gives methanal as one of the product. Its structure is:

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 63


Test: NEET 2020 Past Year Paper - Question 64

A mixture of N2 and Ar gases in a cylinder contains 7 g of N2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N2 is:
[Use atomic masses (in g mol–1): N = 14, Ar = 40]

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 64

According to Dalton’s law


Test: NEET 2020 Past Year Paper - Question 65

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 65

Fact from spectrochemical series.

Test: NEET 2020 Past Year Paper - Question 66

Paper chromatography is an example of :

Detailed Solution for Test: NEET 2020 Past Year Paper - Question 66

It is an example of partition chromatography as mixture of substance are separated by partition.

Test: NEET 2020 Past Year Paper - Question 67

Sucrose on hydrolysis gives: