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

The idea of quantization of energy was proposed by:

Question # 2

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 3

The year when A.H. compton was awarded Nobel Prize is:

Question # 4

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

Question # 5

Victor de-Brogile received the Nobel prize in physics in

Question # 6

Momentum is a parameter associated with

Question # 7

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

Question # 8

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

Question # 9

There is no way to detect:

Question # 10

The value of the Stephen's constant for black body radiations is given by

Question # 11

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

Question # 12

The value of the plank's constant 'h' is given by

Question # 13

Compton was awarded Nobel prize in physics in

Question # 14

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

Question # 15

The special theory of relativity is based on the

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
2 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
3 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
4 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
5 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
6 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
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
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 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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