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WBJEE Physics Test - 9 - JEE MCQ


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30 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 - WBJEE Physics Test - 9

WBJEE Physics Test - 9 for JEE 2024 is part of WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 preparation. The WBJEE Physics Test - 9 questions and answers have been prepared according to the JEE exam syllabus.The WBJEE Physics Test - 9 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for WBJEE Physics Test - 9 below.
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WBJEE Physics Test - 9 - Question 1

In photo electric effect the stopping potential is

Detailed Solution for WBJEE Physics Test - 9 - Question 1

In the photoelectric effect is that the stopping potential is a function of the frequency of the incident light. As shown in Figure, there is even a cutoff frequency ν0 below which there is no photoelectric effect occurs, regardless of the intensity of the light.

A plot of stopping potential vs. frequency of incident light (Cathode: Sodium ; Cutoff frequency νo =4.39x 1014 Hz
Hence option (A) is correct.

WBJEE Physics Test - 9 - Question 2

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

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WBJEE Physics Test - 9 - Question 3

The resistance of a conductor increases with

WBJEE Physics Test - 9 - Question 4

Under elastic limit the stress is

WBJEE Physics Test - 9 - Question 5

The current flowing in a step down transformer 220 V to 22 V having impedance 220 Ω is

WBJEE Physics Test - 9 - Question 6

If electric flux entering and leaving an enclosed surface is φ₁ and φ₂ respectively, the electric charge inside the enclosed surface will be

WBJEE Physics Test - 9 - Question 7

A charge q is placed at the centre of a cube. The magnitude of electric flux through one of its face will be

WBJEE Physics Test - 9 - Question 8

If both the mass and radius of the earth decreases by 1%

WBJEE Physics Test - 9 - Question 9

A machine gun fires a bullet of mass 40 g with a velocity 1200 m−s⁻1. The man holding it can exert a maximum force of 144 N on the gun. How many bullets can he fire per second at the most?

WBJEE Physics Test - 9 - Question 10

A charged particle moves in a circular path in a uniform magnetic field. The radius of circular path is R. When kinetic energy of particle is doubled, then new radius will be

WBJEE Physics Test - 9 - Question 11

Proton and α -particle projected perpendicularly in a magnetic field, if both move in a circular path with same speed. Then ratio of their radii is

WBJEE Physics Test - 9 - Question 12

Which of the following materials is repelled by an external magnetic field?

WBJEE Physics Test - 9 - Question 13

A liquid flows through a pipe of non-uniform cross-section. If A₁ and A₂ are the cross-sectional areas of the pipe at two points, the ratio of velocities of the liquid at these points will be

WBJEE Physics Test - 9 - Question 14

A body moves from rest with a constant acceleration of 5 m/s2. Its instantaneous speed (in m/s) at the end of 10 sec is

WBJEE Physics Test - 9 - Question 15

Two bodies are projected with the same velocity. If one is projected at an angle of 30º and the other at an angle of 60º to the horizontal, the ratio of the maximum heights reached is

WBJEE Physics Test - 9 - Question 16

A particle is projected with certain velocity at two different angles of projections with respect to horizontal plane so as to have same range 'R' on a horizontal plane. If 't1' and 't2' are the time taken for the two paths, then which one of the following relations is correct?

WBJEE Physics Test - 9 - Question 17

When decays to become the particle released is

WBJEE Physics Test - 9 - Question 18

When the displacement is half of the amplitude, then what fraction of the total energy of a simple harmonic oscillator is kinetic ?

WBJEE Physics Test - 9 - Question 19

A spring is stretched by 10 cm when a mass of 1 kg is hanged from it. Now, with the same mass if the spring is pulled and then released, then its time period is 9g=10 m/s2)

WBJEE Physics Test - 9 - Question 20

In a laboratory four convex lenses L1, L2 ,L3 and L4 of focal lengths 2, 4, 6 and 8cm, respectively are available. Two of these lenses form a telescope of length 10cm and magnifying power 4. The objective and eye lenses are respectively

WBJEE Physics Test - 9 - Question 21

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled, and its K.E. halved, then the new angular momentum is

WBJEE Physics Test - 9 - Question 22

The radius of a rotating disc is suddenly reduced to half without any change in its mass. Then its angular velocity will be

WBJEE Physics Test - 9 - Question 23

The process of adding impurities to the pure semiconductor is called

WBJEE Physics Test - 9 - Question 24

The dominant contribution to current comes from holes in case of

WBJEE Physics Test - 9 - Question 25

540 g of ice at 0ºC is mixed with 540 g of water at 80ºC. The final temp. of the mixture in ºC will be

WBJEE Physics Test - 9 - Question 26

We can not define coefficient of linear or real expansion for a gas, because

WBJEE Physics Test - 9 - Question 27

The dimensions of stress are equal to

WBJEE Physics Test - 9 - Question 28

If are any three mutually perpendicular vectors of equal magnitude a then is equal to

WBJEE Physics Test - 9 - Question 29

In young's double slit experiment, three light, blue, yellow and red are used successively. For which colour, will the fringe width be maximum?

WBJEE Physics Test - 9 - Question 30

A body of mass 3 kg is under a force which causes a displacement in it given by S = t2/3. Find the work done by the force in first 2 seconds

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