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

Which of the following is not an example of intertial frame

Question # 2

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

Question # 3

Which of the following phenomenon proves the particle nature of light

Question # 4

Photoelectrons are emitted when ultraviolet light falls on:

Question # 5

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 6

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

Question # 7

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

Question # 8

Wave nature of particle was proposed by

Question # 9

Momentum is a parameter associated with

Question # 10

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

Question # 11

When a platinum wire is heated, it appears white at

Question # 12

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

Question # 13

When a position comes close to an electron they annihilate into

Question # 14

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 15

When a platinum wire is heated, it appears orange red at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
2 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
3 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
4 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
5 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
6 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:
A. Smaller
B. Lerger
C. Same
D. Much larger
7 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
8 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
9 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
10 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m

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