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

According to the special theory of relativity

Question # 2

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 3

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

Question # 4

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

Question # 5

Pair production is the phenomenon in which

Question # 6

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

Question # 7

A photon is considered to have

Question # 8

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

Question # 9

Wien's constant is measured in:

Question # 10

When a platinum wire is heated, it appears orange red at

Question # 11

The energy of photon 'E' is proported to

Question # 12

the dilation of time applies to the timing processes which are:

Question # 13

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

Question # 14

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

Question # 15

Wave nature of particle was proposed by

Question # 16

Which one of the following physical quantities changes with relativistic speed

Question # 17

Victor de-Brogile received the Nobel prize in physics in

Question # 18

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

Question # 19

Photoelectrons are emitted when ultraviolet light falls on:

Question # 20

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

Question # 21

When platinum wire is heated, it appears cherry red at

Question # 22

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 23

Compton shift refers to:

Question # 24

Momentum is a parameter associated with

Question # 25

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 26

Electromagnetic radiation or photons interact with matter in

Question # 27

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

Question # 28

The concept of direction is purely:

Question # 29

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

Question # 30

Which of the following is not an example of intertial frame

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
2 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)
3 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
4 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
5 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
6 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
7 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
8 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
9 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
10 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules

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