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

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 2

the symbol to be used in relativity problems denotes:

Question # 3

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

Question # 4

Practically the quantity v/c is always:

Question # 5

Electromagnetic radiation or photons interact with matter in

Question # 6

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 7

According to the special theory of relativity

Question # 8

de-Broglies hypthesis was experimentally verified by

Question # 9

Which of the following phenomenon proves the particle nature of light

Question # 10

If a material object moves with the speed of light 'C' its mass becomes

Question # 11

The positron was discovered by:

Question # 12

When platinum wire is heated, it appears cherry red at

Question # 13

Converse of pair production is known as

Question # 14

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 15

The energy of photon 'E' is proported to

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
2 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
3 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
4 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
5 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
6 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
7 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
8 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
9 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
10 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them

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