ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

0.1 kg mass will be equivalent to the energy

Question # 3

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

The positron was discovered by:

Question # 6

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

Question # 7

According to the special theory of relativity

Question # 8

In photoelectric effect the energy of ejected electrons depend on

Question # 9

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

Question # 10

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

Question # 11

Converse of pair production is known as

Question # 12

Which one of the following physical quantities changes with relativistic speed

Question # 13

Photoelectrons are emitted when ultraviolet light falls on:

Question # 14

Which of the following phenomenon proves the particle nature of light

Question # 15

An intertial frame of reference is a frame of reference which is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
2 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
3 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
4 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
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 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
7 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
8 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
9 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)
10 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these

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