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

Electromagnetic -radiation means:

Question # 2

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 7

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 8

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

Question # 9

Electromagnetic radiation or photons interact with matter in

Question # 10

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 11

If a material object moves with the speed of light 'C' its mass becomes

Question # 12

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 13

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

Question # 14

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 15

A black body is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
2 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
6 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
7 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
8 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
9 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
10 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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