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

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

Question # 2

Wien's constant is measured in:

Question # 3

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

Question # 4

Photocell is a device which converts

Question # 5

The value of threshold frequency for different metals is

Question # 6

Converse of pair production is known as

Question # 7

There is no way to detect:

Question # 8

The concept of direction is purely:

Question # 9

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

Question # 10

At the temperature, a body emits radiation which is principally

Question # 11

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 12

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

Question # 13

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

Question # 14

the symbol to be used in relativity problems denotes:

Question # 15

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

Question # 16

The energy of a photon is represented by

Question # 17

de-Broglies hypthesis was experimentally verified by

Question # 18

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 19

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 20

The inside cavity of the black body is

Question # 21

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

Question # 22

Intensity of light determines the:

Question # 23

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

Question # 24

Photoelectrons are emitted when ultraviolet light falls on:

Question # 25

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

Question # 26

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 # 27

Victor de-Brogile received the Nobel prize in physics in

Question # 28

The value of the plank's constant 'h' is given by

Question # 29

According to the special theory of relativity, time is

Question # 30

According to the special theory of relativity

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
2 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
3 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
4 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
5 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)
6 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
7 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
8 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
9 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
10 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

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