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

The general theory of relativity treats problems involving

Question # 2

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

Question # 3

Photoelectric effect takes place with a photon of:

Question # 4

0.1 kg mass will be equivalent to the energy

Question # 5

Compton was awarded Nobel prize in physics in

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

According to the special theory of relativity

Question # 10

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

Question # 11

There is no way to detect:

Question # 12

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

Question # 13

When platinum wire is heated, it appears cherry red at

Question # 14

Wave nature of particle was proposed by

Question # 15

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 # 16

Wien's constant is measured in:

Question # 17

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

Question # 18

The concept of direction and position are purely

Question # 19

According to the special theory of relativity, time is

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 Max plank, energy is redialed or absorbed in

Question # 22

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

Question # 23

Electromagnetic radiation or photons interact with matter in

Question # 24

Due to relative motion of observer and the frame of reference of events, time always:

Question # 25

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

Question # 26

Photocell is a device which converts

Question # 27

The Stephen-Boltzmann law for the black body radiation is given by

Question # 28

Position was discovered by Carl Anderson in

Question # 29

The special theory of relativity is based on the

Question # 30

An intertial frame of reference is a frame of reference which is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
2 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
3 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
4 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
5 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
6 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
7 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
8 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
9 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
10 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above

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