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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

Intensity of light determines the:

Question # 6

When a platinum wire is heated, it appears white at

Question # 7

The value of threshold frequency for different metals is

Question # 8

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

Question # 9

According to the special theory of relativity, a moving clock

Question # 10

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

Question # 11

The photon of radio-waves has energy of about

Question # 12

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

Question # 13

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 14

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

Question # 15

Absolute motion cannot be detected

Question # 16

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

Question # 17

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

Question # 18

de-Broglies hypthesis was experimentally verified by

Question # 19

Which of the following phenomenon proves the particle nature of light

Question # 20

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

Question # 21

Strictly speaking, the earth is:

Question # 22

The special theory of relatively treats the problems involving:

Question # 23

The general theory of relativity treats problems involving

Question # 24

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

Question # 25

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

Question # 26

Electromagnetic radiation or photons interact with matter in

Question # 27

the symbol to be used in relativity problems denotes:

Question # 28

S.I. unit of planks constant is

Question # 29

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

Question # 30

Photoelectric effect takes place with a photon of:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
2 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
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 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
5 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
6 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
7 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
8 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
9 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
10 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these

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