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

At the temperature, a body emits radiation which is principally

Question # 2

The inside cavity of the black body is

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 5

According to the special theory of relativity

Question # 6

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

Question # 7

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 # 8

the symbol to be used in relativity problems denotes:

Question # 9

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

Question # 10

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 11

Position was discovered by Carl Anderson in

Question # 12

According to the special theory of relativity, time is

Question # 13

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 14

Which one of the following physical quantities changes with relativistic speed

Question # 15

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

Question # 16

A particle having mass and charge equal to that of an electron is called:

Question # 17

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

Question # 18

Davision and Germer performed experiment to verify

Question # 19

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

Question # 20

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 21

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

Question # 22

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

Question # 23

When a position comes close to an electron they annihilate into

Question # 24

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

Question # 25

Practically the quantity v/c is always:

Question # 26

The photon of radio-waves has energy of about

Question # 27

A black body is

Question # 28

When a position comes close to an electron they annihilate into photons such that

Question # 29

Which of the following is not an example of intertial frame

Question # 30

The special theory of relativity treats problems invoving

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
2 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
3 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
4 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
5 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
6 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
8 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
9 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
10 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford

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