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

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

de-Broglies hypthesis was experimentally verified by

Question # 4

The length contraction happens only

Question # 5

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 6

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

Question # 7

Which of the following phenomenon proves the particle nature of light

Question # 8

According to the special theory of relativity

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

Pair production is the phenomenon in which

Question # 11

Which one of the following physical quantities changes with relativistic speed

Question # 12

Electromagnetic radiation or photons interact with matter in

Question # 13

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 14

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

Question # 15

When a position comes close to an electron they annihilate into

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
2 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
3 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)
4 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
5 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
6 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
7 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 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)
9 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
10 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928

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