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

When a platinum wire is heated, it appears white at

Question # 2

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

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

Newton's law of motion do not hold in

Question # 9

Compton shift refers to:

Question # 10

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

Question # 11

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

Question # 12

A black body is

Question # 13

When platinum wire is heated, it appears cherry red at

Question # 14

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

Question # 15

The positron was discovered by:

Question # 16

When a platinum wire is heated, it appears yellow at

Question # 17

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

Question # 18

According to the special theory of relativity

Question # 19

The special theory of relativity is based on:

Question # 20

S.I. unit of planks constant is

Question # 21

When a position comes close to an electron they annihilate into

Question # 22

the symbol to be used in relativity problems denotes:

Question # 23

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 24

According to the special theory of relativity, time is

Question # 25

At the temperature, a body emits radiation which is principally

Question # 26

According to Einstein, with the great increase in the speed of the body the relativistic length of the body

Question # 27

Due to relative motion of observer and the frame of reference of events, time always:

Question # 28

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 29

The energy of photon 'E' is proported to

Question # 30

There is no way to detect:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
2 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
5 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
8 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
9 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
10 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m

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