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 dilation of time applies to the timing processes which are:

Question # 2

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 # 3

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

Question # 4

Compton shift refers to:

Question # 5

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

Question # 6

The length contraction happens only

Question # 7

Converse of pair production is known as

Question # 8

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 9

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 10

Photoelectric effect takes place with a photon of:

Question # 11

When a platinum wire is heated, it appears yellow at

Question # 12

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 13

As the light shines on the metal surface, the electrons are ejected

Question # 14

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

Question # 15

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
2 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
3 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
4 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
5 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
6 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 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)
8 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
9 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
10 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways

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