ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

An intertial frame of reference is a frame of reference which is

Question # 2

Photoelectrons are emitted when ultraviolet light falls on:

Question # 3

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 4

In order to produce pair production, a photon must have a energy

Question # 5

The mass of an object will be doubled at speed

Question # 6

When a platinum wire is heated, it appears white at

Question # 7

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 8

Due to relative motion of observer and the frame of reference of events, time always:

Question # 9

When the atomic particle are moving with velocities approaching that of light:

Question # 10

From the theory of relativity, momentum p of the photon is related to energy as

Question # 11

According to the special theory of relativity

Question # 12

0.1 kg mass will be equivalent to the energy

Question # 13

According to the special theory of relativity, a moving clock

Question # 14

Wave nature of particle was proposed by

Question # 15

Compton was awarded Nobel prize in physics in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
2 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
3 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
4 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
5 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
6 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
7 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
8 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
9 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
10 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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