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

Compton was awarded Nobel prize in physics in

Question # 2

Converse of pair production is known as

Question # 3

Pair production is the phenomenon in which

Question # 4

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 5

The general theory of relativity treats problems involving

Question # 6

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

Question # 7

The existence of position was predicted by Dirace in

Question # 8

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

Question # 9

The value of threshold frequency for different metals is

Question # 10

The energy of the 4th orbit in hydrogen atom is

Question # 11

The energy of photon 'E' is proported to

Question # 12

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 13

the dilation of time applies to the timing processes which are:

Question # 14

Newton's law of motion do not hold in

Question # 15

The inside cavity of the black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
2 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
3 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
5 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)
6 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
7 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
8 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
9 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
10 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these

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