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 stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 2

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 3

The photon of radio-waves has energy of about

Question # 4

The special theory of relatively treats the problems involving:

Question # 5

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 6

When a position comes close to an electron they annihilate into photons such that

Question # 7

Electromagnetic -radiation means:

Question # 8

Photoelectrons are emitted when ultraviolet light falls on:

Question # 9

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

Question # 10

The concept of direction and position are purely

Question # 11

Photocell is a device which converts

Question # 12

The general theory of relativity treats problems involving

Question # 13

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 14

The special theory of relativity is based on the

Question # 15

Electromagnetic radiation or photons interact with matter in

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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 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
3 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
4 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
6 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
7 the symbol to be used in relativity problems denotes:
A. Dilated time
B. Proper time
C. Life time
D. Half time
8 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
9 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
10 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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