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 symbol to be used in relativity problems denotes:

Question # 2

As the light shines on the metal surface, the electrons are ejected

Question # 3

The special theory of relativity treats problems invoving

Question # 4

Electromagnetic radiation or photons interact with matter in

Question # 5

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

Question # 6

At the temperature, a body emits radiation which is principally

Question # 7

A photon is considered to have

Question # 8

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 9

Pair production is the phenomenon in which

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

Position was discovered by Carl Anderson in

Question # 14

the dilation of time applies to the timing processes which are:

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
2 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
3 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
4 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
5 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
6 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
7 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
8 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
9 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918

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