ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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 idea of quantization of energy was proposed by:

Question # 2

The length contraction happens only

Question # 3

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 4

When a platinum wire is heated, it appears white at

Question # 5

When platinum wire is heated, it appears cherry red at

Question # 6

The special theory of relativity is based on the

Question # 7

S.I. unit of planks constant is

Question # 8

Which of the following phenomenon proves the particle nature of light

Question # 9

The existence of position was predicted by Dirace in

Question # 10

Pair production is the phenomenon in which

Question # 11

0.1 kg mass will be equivalent to the energy

Question # 12

The year when A.H. compton was awarded Nobel Prize is:

Question # 13

In photoelectric effect the energy of ejected electrons depend on

Question # 14

Converse of pair production is known as

Question # 15

The special theory of relatively treats the problems involving:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
2 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
3 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
4 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
5 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
6 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
7 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
8 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
9 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
10 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle

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