ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

Try The 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

Due to relative motion of observer and the frame of reference of events, time always:

Question # 2

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 3

According to the special theory of relativity

Question # 4

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

Question # 5

The unit of work function is:

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

Position was discovered by Carl Anderson in

Question # 8

Compton was awarded Nobel prize in physics in

Question # 9

When a position comes close to an electron they annihilate into

Question # 10

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

Question # 11

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 12

The concept of direction and position are purely

Question # 13

When a platinum wire is heated, it appears yellow at

Question # 14

Newton's law of motion do not hold in

Question # 15

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

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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 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
3 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
4 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
5 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
6 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
7 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
8 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
9 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)
10 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these

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