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 idea of quantization of energy was proposed by:

Question # 2

When a position comes close to an electron they annihilate into photons such that

Question # 3

Which one of the following physical quantities changes with relativistic speed

Question # 4

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

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 7

An inertial frame is that frame in which

Question # 8

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

Question # 9

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

Question # 10

The energy of photon 'E' is proported to

Question # 11

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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

A non-inertial frame of reference is one, in which

Question # 15

When platinum wire is heated, it appears cherry red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
2 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
3 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
4 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
5 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
6 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
7 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
8 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
9 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
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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