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

There is no way to detect:

Question # 2

Strictly speaking, the earth is:

Question # 3

Absolute motion cannot be detected

Question # 4

As the light shines on the metal surface, the electrons are ejected

Question # 5

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

Question # 6

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

Question # 7

According to the special theory of relativity

Question # 8

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 9

The concept of direction is purely:

Question # 10

The energy of the 4th orbit in hydrogen atom is

Question # 11

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

Question # 12

Photoelectric effect takes place with a photon of:

Question # 13

A black body is

Question # 14

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 15

Newton's law of motion do not hold in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
2 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
3 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
4 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
5 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
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 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
8 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
9 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
10 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

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