ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

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

Question # 3

There is no way to detect:

Question # 4

When a position comes close to an electron they annihilate into

Question # 5

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 6

The nature of radiations emitted by a hot body depends upon its:

Question # 7

At the temperature, a body emits radiation which is principally

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

According to the special theory of relativity, time is

Question # 12

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 13

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

Question # 14

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 # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
2 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
3 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
4 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
5 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
6 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
7 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
8 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
9 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
10 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these

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