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

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

Question # 3

Wien's constant is measured in:

Question # 4

The energy of the 4th orbit in hydrogen atom is

Question # 5

Victor de-Brogile received the Nobel prize in physics in

Question # 6

At the temperature, a body emits radiation which is principally

Question # 7

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 8

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

Question # 9

The special theory of relativity treats problems invoving

Question # 10

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 11

The value of threshold frequency for different metals is

Question # 12

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

Question # 13

The Stephen-Boltzmann law for the black body radiation is given by

Question # 14

Photoelectric effect takes place with a photon of:

Question # 15

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
3 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
4 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
5 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
6 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
7 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
8 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
9 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
10 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics

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