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

According to the special theory of relativity, time is

Question # 3

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 # 4

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

Question # 5

The photon of radio-waves has energy of about

Question # 6

An inertial frame is that frame in which

Question # 7

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

Question # 8

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 9

The special theory of relativity is based on:

Question # 10

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

Question # 11

A black body is

Question # 12

Compton was awarded Nobel prize in physics in

Question # 13

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

Question # 14

Davision and Germer performed experiment to verify

Question # 15

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

Question # 16

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

Question # 17

The positron was discovered by:

Question # 18

0.1 kg mass will be equivalent to the energy

Question # 19

The year when A.H. compton was awarded Nobel Prize is:

Question # 20

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 21

The special theory of relatively treats the problems involving:

Question # 22

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

Question # 23

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

Question # 24

Wave nature of particle was proposed by

Question # 25

At the temperature, a body emits radiation which is principally

Question # 26

Which one of the following physical quantities changes with relativistic speed

Question # 27

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

Question # 28

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

Question # 29

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 30

Practically the quantity v/c is always:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
2 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
3 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
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 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
6 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
7 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
8 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
9 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
10 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates

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