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

Try The 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

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

Question # 2

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

Question # 3

The energy of a photon is represented by

Question # 4

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

Question # 5

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 6

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 7

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 8

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

Question # 9

The existence of position was predicted by Dirace in

Question # 10

The energy of photon 'E' is proported to

Question # 11

In photoelectric effect the energy of ejected electrons depend on

Question # 12

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 13

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

Question # 14

Which of the following is not an example of intertial frame

Question # 15

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

Question # 16

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 17

The unit of work function is:

Question # 18

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

Question # 19

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

Question # 20

Davision and Germer performed experiment to verify

Question # 21

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 22

The special theory of relativity is based on:

Question # 23

The concept of direction and position are purely

Question # 24

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

Question # 25

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

Question # 26

The special theory of relativity is based on the

Question # 27

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 28

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 29

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

Question # 30

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
2 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 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
4 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
5 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
6 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
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
9 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
10 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

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