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 energy of a photon is represented by

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

According to the special theory of relativity, a moving clock

Question # 6

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

Question # 7

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

Question # 8

Intensity of light determines the:

Question # 9

The special theory of relativity is based on the

Question # 10

S.I. unit of planks constant is

Question # 11

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

Question # 12

Photoelectrons are emitted when ultraviolet light falls on:

Question # 13

At the temperature, a body emits radiation which is principally

Question # 14

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:

Question # 15

Electromagnetic radiation or photons interact with matter in

Question # 16

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

Question # 17

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

Question # 18

Position was discovered by Carl Anderson in

Question # 19

Practically the quantity v/c is always:

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

The energy of photon 'E' is proported to

Question # 25

A photon is considered to have

Question # 26

An intertial frame of reference is a frame of reference which is

Question # 27

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

Question # 28

0.1 kg mass will be equivalent to the energy

Question # 29

The nature of radiations emitted by a hot body depends upon its:

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
2 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
3 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
4 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
5 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
6 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
7 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
8 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
9 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
10 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

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