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

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

Question # 2

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 3

S.I. unit of planks constant is

Question # 4

Compton was awarded Nobel prize in physics in

Question # 5

Davision and Germer performed experiment to verify

Question # 6

The concept of direction and position are purely

Question # 7

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

Question # 8

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 9

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 10

Absolute motion cannot be detected

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

With the help of 50 K v electron microscope, a resolution of

Question # 15

When the atomic particle are moving with velocities approaching that of light:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
3 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
4 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
5 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
6 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
7 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
8 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
9 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
10 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above

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