ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

The special theory of relatively treats the problems involving:

Question # 2

Which one of the following physical quantities changes with relativistic speed

Question # 3

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 4

The special theory of relativity is based on the

Question # 5

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 6

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 7

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 8

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

Question # 9

The special theory of relativity is based on:

Question # 10

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 11

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 12

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

Question # 13

The Stephen-Boltzmann law for the black body radiation is given by

Question # 14

The unit of work function is:

Question # 15

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
3 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
4 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
5 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
6 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
7 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
8 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
9 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
10 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these

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