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

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:

Question # 2

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 3

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

Question # 4

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

Question # 5

According to the Max plank, energy is redialed or absorbed in

Question # 6

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 7

A particle having mass and charge equal to that of an electron is called:

Question # 8

Absolute motion cannot be detected

Question # 9

Photoelectrons are emitted when ultraviolet light falls on:

Question # 10

Compton was awarded Nobel prize in physics in

Question # 11

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 12

Converse of pair production is known as

Question # 13

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 14

The energy of the 4th orbit in hydrogen atom is

Question # 15

G.P. Thomson observer experimentally that electrons and neutrons possess

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
2 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
3 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
4 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
5 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
6 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
7 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
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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