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 concept of direction and position are purely

Question # 2

Compton shift refers to:

Question # 3

Photoelectric effect takes place with a photon of:

Question # 4

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 5

The special theory of relatively treats the problems involving:

Question # 6

Which of the following phenomenon proves the particle nature of light

Question # 7

The value of threshold frequency for different metals is

Question # 8

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

Question # 9

Compton was awarded Nobel prize in physics in

Question # 10

S.I. unit of planks constant is

Question # 11

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 12

Newton's law of motion do not hold in

Question # 13

Electromagnetic radiation or photons interact with matter in

Question # 14

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

Question # 15

the symbol to be used in relativity problems denotes:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
2 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
3 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
4 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
5 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
6 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
7 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
8 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
9 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
10 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these

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