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

From the theory of relativity, momentum p of the photon is related to energy as

Question # 2

According to the special theory of relativity

Question # 3

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

Question # 4

The value of threshold frequency for different metals is

Question # 5

The length contraction happens only

Question # 6

According to the special theory of relativity, time is

Question # 7

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

Question # 8

Absolute motion cannot be detected

Question # 9

The energy of a photon is represented by

Question # 10

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

Question # 11

the dilation of time applies to the timing processes which are:

Question # 12

Intensity of light determines the:

Question # 13

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 14

the symbol to be used in relativity problems denotes:

Question # 15

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
2 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
3 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
4 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
5 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
6 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
7 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
8 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)
9 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
10 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these

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