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 value of threshold frequency for different metals is

Question # 2

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

Question # 3

The general theory of relativity treats problems involving

Question # 4

The existence of position was predicted by Dirace in

Question # 5

S.I. unit of planks constant is

Question # 6

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

Question # 7

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

Question # 8

Newton's law of motion do not hold in

Question # 9

Which one of the following physical quantities changes with relativistic speed

Question # 10

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 11

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

Question # 12

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

Question # 13

When a position comes close to an electron they annihilate into photons such that

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

According to the special theory of relativity

Question # 19

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

Question # 20

Pair production is the phenomenon in which

Question # 21

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

Question # 22

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

Question # 23

Which of the following is not an example of intertial frame

Question # 24

At the temperature, a body emits radiation which is principally

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

Position was discovered by Carl Anderson in

Question # 29

the symbol to be used in relativity problems denotes:

Question # 30

de-Broglies hypthesis was experimentally verified by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
3 When a position comes close to an electron they annihilate into photons such that
A. each photon has energy 0.51 Me v
B. each photon has energy 1.02 Me v
C. each photon has energy 0.25 Me v
D. none of these
4 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
5 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
6 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
7 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
8 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
9 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
10 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)

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