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

Intensity of light determines the:

Question # 2

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

Question # 3

Electromagnetic radiation or photons interact with matter in

Question # 4

Which of the following is not an example of intertial frame

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The nature of radiations emitted by a hot body depends upon its:

Question # 9

The special theory of relativity is based on:

Question # 10

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

Question # 11

Practically the quantity v/c is always:

Question # 12

The idea of quantization of energy was proposed by:

Question # 13

Newton's law of motion do not hold in

Question # 14

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

Question # 15

The general theory of relativity treats problems involving

Question # 16

The existence of position was predicted by Dirace in

Question # 17

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

Which of the following phenomenon proves the particle nature of light

Question # 22

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

Question # 23

In photoelectric effect the energy of ejected electrons depend on

Question # 24

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

Question # 25

the symbol to be used in relativity problems denotes:

Question # 26

A photon is considered to have

Question # 27

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 28

The Einstein's changes in length, mass and time are not observed in common life because

Question # 29

From the theory of relativity, momentum p of the photon is related to energy as

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
4 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
5 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
6 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
7 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
8 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
9 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
10 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero

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