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

As the light shines on the metal surface, the electrons are ejected

Question # 2

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

Question # 3

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 4

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

Question # 5

The photon of radio-waves has energy of about

Question # 6

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 7

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 8

An inertial frame is that frame in which

Question # 9

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

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

At the temperature, a body emits radiation which is principally

Question # 12

If a material object moves with the speed of light 'C' its mass becomes

Question # 13

The value of the plank's constant 'h' is given by

Question # 14

The special theory of relativity is based on the

Question # 15

The energy of the 4th orbit in hydrogen atom is

Question # 16

When platinum wire is heated, it appears cherry red at

Question # 17

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

Question # 18

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

Question # 19

The energy of a photon is represented by

Question # 20

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

Question # 21

Compton was awarded Nobel prize in physics in

Question # 22

Photoelectric effect takes place with a photon of:

Question # 23

Which one of the following physical quantities changes with relativistic speed

Question # 24

A black body is

Question # 25

Wave nature of particle was proposed by

Question # 26

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

Question # 27

S.I. unit of planks constant is

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
2 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
3 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
4 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
5 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
6 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
7 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
8 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
9 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
10 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

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