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 way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 2

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

Question # 3

A photon is considered to have

Question # 4

When a position comes close to an electron they annihilate into

Question # 5

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

Question # 6

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

Question # 7

Which of the following is not an example of intertial frame

Question # 8

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

Question # 9

A non-inertial frame of reference is one, in which

Question # 10

The general theory of relativity treats problems involving

Question # 11

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

Question # 12

S.I. unit of planks constant is

Question # 13

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

Question # 14

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

Question # 15

According to the special theory of relativity, a moving clock

Question # 16

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 17

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

Question # 18

Photoelectric effect takes place with a photon of:

Question # 19

The idea of quantization of energy was proposed by:

Question # 20

Intensity of light determines the:

Question # 21

When a platinum wire is heated, it appears yellow at

Question # 22

The positron was discovered by:

Question # 23

The special theory of relativity is based on the

Question # 24

Pair production is the phenomenon in which

Question # 25

Practically the quantity v/c is always:

Question # 26

When a platinum wire is heated, it appears dull red at about

Question # 27

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 28

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

Question # 29

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

Question # 30

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

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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 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
3 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
4 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
5 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
6 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
7 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
8 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
9 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
10 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

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