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

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

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

Question # 4

Photocell is a device which converts

Question # 5

The value of threshold frequency for different metals is

Question # 6

The photon of radio-waves has energy of about

Question # 7

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

Question # 8

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

Question # 9

The special theory of relatively treats the problems involving:

Question # 10

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

Question # 11

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

Question # 12

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 13

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 14

Davision and Germer performed experiment to verify

Question # 15

Position was discovered by Carl Anderson in

Question # 16

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

Question # 17

Photoelectrons are emitted when ultraviolet light falls on:

Question # 18

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

Question # 19

0.1 kg mass will be equivalent to the energy

Question # 20

The unit of work function is:

Question # 21

Which of the following is not an example of intertial frame

Question # 22

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

Question # 23

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 # 24

Practically the quantity v/c is always:

Question # 25

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 26

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

Question # 27

The energy of a photon is represented by

Question # 28

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

Question # 29

S.I. unit of planks constant is

Question # 30

Electromagnetic radiation or photons interact with matter in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
3 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
4 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
5 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
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
8 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
10 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume

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