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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

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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.

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