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

Compton shift refers to:

Question # 2

The special theory of relatively treats the problems involving:

Question # 3

The length contraction happens only

Question # 4

When a platinum wire is heated, it appears white at

Question # 5

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

Question # 6

The existence of position was predicted by Dirace in

Question # 7

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 # 8

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

Question # 9

Practically the quantity v/c is always:

Question # 10

Absolute motion cannot be detected

Question # 11

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

Question # 12

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

Question # 13

Newton's law of motion do not hold in

Question # 14

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

Question # 15

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
2 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
3 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
4 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
5 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
6 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
7 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
8 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
9 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
10 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer

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