ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

Newton's law of motion do not hold in

Question # 2

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

Question # 3

The photon of radio-waves has energy of about

Question # 4

Practically the quantity v/c is always:

Question # 5

Photocell is a device which converts

Question # 6

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

Question # 7

the dilation of time applies to the timing processes which are:

Question # 8

Wave nature of particle was proposed by

Question # 9

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 10

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 11

According to the special theory of relativity, time is

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
2 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
3 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
4 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
5 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
7 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
8 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
9 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
10 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1

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