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

Pair production is the phenomenon in which

Question # 2

An inertial frame is that frame in which

Question # 3

the symbol to be used in relativity problems denotes:

Question # 4

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 5

Compton shift refers to:

Question # 6

The inside cavity of the black body is

Question # 7

If a material object moves with the speed of light 'C' its mass becomes

Question # 8

Victor de-Brogile received the Nobel prize in physics in

Question # 9

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

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 12

The value of the Stephen's constant for black body radiations is given by

Question # 13

The special theory of relativity is based on the

Question # 14

Which of the following phenomenon proves the particle nature of light

Question # 15

According to the special theory of relativity, a moving clock

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
3 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
4 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
5 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
8 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
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 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible

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