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

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

Question # 2

Strictly speaking, the earth is:

Question # 3

Which one of the following physical quantities changes with relativistic speed

Question # 4

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

Question # 5

Practically the quantity v/c is always:

Question # 6

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 7

In order to produce pair production, a photon must have a energy

Question # 8

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

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

The unit of work function is:

Question # 11

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

Question # 12

The special theory of relativity is based on:

Question # 13

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

Question # 14

The mass of an object will be doubled at speed

Question # 15

A photon is considered to have

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
2 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
3 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
4 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
5 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
6 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
7 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
8 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
9 Momentum is a parameter associated with
A. wave motion
B. particle motion
C. neither wave nor particle motion
D. none of these
10 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C

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