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

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 2

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

Question # 3

The length contraction happens only

Question # 4

Wien's constant is measured in:

Question # 5

The nature of radiations emitted by a hot body depends upon its:

Question # 6

The value of threshold frequency for different metals is

Question # 7

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

Question # 8

Which one of the following physical quantities changes with relativistic speed

Question # 9

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

Question # 10

Compton shift refers to:

Question # 11

The photon of radio-waves has energy of about

Question # 12

The special theory of relativity is based on:

Question # 13

S.I. unit of planks constant is

Question # 14

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
2 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
3 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
4 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
5 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)
6 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
7 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
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 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
10 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

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