ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Victor de-Brogile received the Nobel prize in physics in

Question # 2

Converse of pair production is known as

Question # 3

Compton was awarded Nobel prize in physics in

Question # 4

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 5

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 6

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

Question # 7

In photoelectric effect the energy of ejected electrons depend on

Question # 8

The special theory of relativity is based on:

Question # 9

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 10

0.1 kg mass will be equivalent to the energy

Question # 11

Newton's law of motion do not hold in

Question # 12

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 13

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 14

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 15

At the temperature, a body emits radiation which is principally

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
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 general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 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
5 As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
A. Smaller
B. Lerger
C. Same
D. Much larger
6 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
7 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
8 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity

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