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

There is no way to detect:

Question # 2

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

Question # 3

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

Question # 4

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 5

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

Question # 6

Practically the quantity v/c is always:

Question # 7

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 8

Compton was awarded Nobel prize in physics in

Question # 9

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

Question # 10

Strictly speaking, the earth is:

Question # 11

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 # 12

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

Question # 13

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 14

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

Question # 15

de-Broglies hypthesis was experimentally verified by

Question # 16

The energy of a photon is represented by

Question # 17

A black body is

Question # 18

A photon is considered to have

Question # 19

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

Question # 20

The concept of direction and position are purely

Question # 21

The general theory of relativity treats problems involving

Question # 22

Wien's constant is measured in:

Question # 23

When a platinum wire is heated, it appears white at

Question # 24

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

Question # 25

With the help of 50 K v electron microscope, a resolution of

Question # 26

Electromagnetic radiation or photons interact with matter in

Question # 27

Electromagnetic -radiation means:

Question # 28

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

Question # 29

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

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 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
2 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
3 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
4 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
5 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
6 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
7 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
8 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
9 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
10 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal

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