ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 2

The inside cavity of the black body is

Question # 3

The special theory of relativity is based on:

Question # 4

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

Question # 5

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 6

Electromagnetic -radiation means:

Question # 7

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 8

When a platinum wire is heated, it appears orange red at

Question # 9

Converse of pair production is known as

Question # 10

From the theory of relativity, momentum p of the photon is related to energy as

Question # 11

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

Question # 12

Photoelectrons are emitted when ultraviolet light falls on:

Question # 13

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

Question # 14

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

Question # 15

According to the Max plank, energy is redialed or absorbed in

Question # 16

0.1 kg mass will be equivalent to the energy

Question # 17

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 18

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

Question # 19

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 20

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

Question # 21

According to the special theory of relativity, time is

Question # 22

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

Question # 23

The special theory of relativity treats problems invoving

Question # 24

Momentum is a parameter associated with

Question # 25

The value of threshold frequency for different metals is

Question # 26

The idea of quantization of energy was proposed by:

Question # 27

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 28

The energy of photon 'E' is proported to

Question # 29

A particle having mass and charge equal to that of an electron is called:

Question # 30

At the temperature, a body emits radiation which is principally

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
2 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
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 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
5 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
6 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
7 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
8 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
9 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
10 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

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