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

00:00
Question # 1

Photoelectrons are emitted when ultraviolet light falls on:

Question # 2

The year when A.H. compton was awarded Nobel Prize is:

Question # 3

Electromagnetic radiation or photons interact with matter in

Question # 4

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

Question # 5

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 # 6

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

Question # 7

Compton was awarded Nobel prize in physics in

Question # 8

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

Question # 9

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

Question # 10

Electromagnetic -radiation means:

Question # 11

The energy of photon 'E' is proported to

Question # 12

S.I. unit of planks constant is

Question # 13

Davision and Germer performed experiment to verify

Question # 14

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 15

A black body is

Question # 16

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

Question # 17

Strictly speaking, the earth is:

Question # 18

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

Question # 19

Photocell is a device which converts

Question # 20

the symbol to be used in relativity problems denotes:

Question # 21

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

Question # 22

de-Broglies hypthesis was experimentally verified by

Question # 23

There is no way to detect:

Question # 24

According to the special theory of relativity

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

When a platinum wire is heated, it appears yellow at

Question # 29

According to the special theory of relativity, time is

Question # 30

The unit of work function is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
2 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:
A. Smaller
B. Lerger
C. Same
D. Much larger
3 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
4 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
5 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
6 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
7 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
8 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
9 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
10 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)

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