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

Question # 2

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

According to the special theory of relativity, time is

Question # 9

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

Question # 10

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

Question # 11

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 12

S.I. unit of planks constant is

Question # 13

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

Question # 14

According to the Max plank, energy is redialed or absorbed in

Question # 15

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

Question # 16

The idea of quantization of energy was proposed by:

Question # 17

The Einstein's changes in length, mass and time are not observed in common life because

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

Photoelectric effect takes place with a photon of:

Question # 22

Momentum is a parameter associated with

Question # 23

If a material object moves with the speed of light 'C' its mass becomes

Question # 24

When platinum wire is heated, it appears cherry red at

Question # 25

The unit of work function is:

Question # 26

From the theory of relativity, momentum p of the photon is related to energy as

Question # 27

The energy of a photon is represented by

Question # 28

The length contraction happens only

Question # 29

Strictly speaking, the earth is:

Question # 30

Compton shift refers to:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
2 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
3 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
5 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
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 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 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)
10 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White

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