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

Strictly speaking, the earth is:

Question # 2

The positron was discovered by:

Question # 3

When a position comes close to an electron they annihilate into

Question # 4

At the temperature, a body emits radiation which is principally

Question # 5

The idea of quantization of energy was proposed by:

Question # 6

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

Question # 7

the symbol to be used in relativity problems denotes:

Question # 8

Wien's constant is measured in:

Question # 9

According to the special theory of relativity, time is

Question # 10

When a platinum wire is heated, it appears dull red at about

Question # 11

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 12

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

Question # 13

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 14

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

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 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
2 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
3 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
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 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
6 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
7 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
8 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
9 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
10 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK

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