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

Intensity of light determines the:

Question # 2

Pair production is the phenomenon in which

Question # 3

An inertial frame is that frame in which

Question # 4

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 5

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

Question # 6

Photocell is a device which converts

Question # 7

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 8

Electromagnetic radiation or photons interact with matter in

Question # 9

The value of the Stephen's constant for black body radiations is given by

Question # 10

The concept of direction is purely:

Question # 11

the symbol to be used in relativity problems denotes:

Question # 12

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

Question # 13

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

Question # 14

The positron was discovered by:

Question # 15

When a position comes close to an electron they annihilate into

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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 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
3 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
4 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
5 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
6 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
7 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
8 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
9 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
10 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these

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