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

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

Question # 2

The special theory of relativity is based on:

Question # 3

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 4

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

Question # 5

When a position comes close to an electron they annihilate into

Question # 6

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

Question # 7

S.I. unit of planks constant is

Question # 8

Wien's constant is measured in:

Question # 9

Absolute motion cannot be detected

Question # 10

The value of the plank's constant 'h' is given by

Question # 11

When a platinum wire is heated, it appears dull red at about

Question # 12

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

Question # 13

Which one of the following physical quantities changes with relativistic speed

Question # 14

The special theory of relativity treats problems invoving

Question # 15

Which of the following phenomenon proves the particle nature of light

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
2 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
3 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
4 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
5 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
6 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
8 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
10 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them

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