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

Photoelectric effect takes place with a photon of:

Question # 2

When the atomic particle are moving with velocities approaching that of light:

Question # 3

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 4

Which of the following is not an example of intertial frame

Question # 5

The inside cavity of the black body is

Question # 6

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

Question # 7

Absolute motion cannot be detected

Question # 8

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 9

Electromagnetic -radiation means:

Question # 10

The concept of direction is purely:

Question # 11

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 12

Strictly speaking, the earth is:

Question # 13

The special theory of relatively treats the problems involving:

Question # 14

Which of the following phenomenon proves the particle nature of light

Question # 15

The general theory of relativity treats problems involving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
3 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
4 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
5 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
6 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
7 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
8 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
9 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 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

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