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

Davision and Germer performed experiment to verify

Question # 2

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

Question # 3

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

Question # 4

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 5

According to the special theory of relativity, time is

Question # 6

The idea of quantization of energy was proposed by:

Question # 7

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

Question # 8

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

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

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

Question # 12

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

Question # 13

A photon is considered to have

Question # 14

The value of the plank's constant 'h' is given by

Question # 15

Which of the following phenomenon proves the particle nature of light

Question # 16

The length contraction happens only

Question # 17

There is no way to detect:

Question # 18

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

Question # 19

When platinum wire is heated, it appears cherry red at

Question # 20

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 21

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

Question # 22

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

Question # 23

The energy of the 4th orbit in hydrogen atom is

Question # 24

Position was discovered by Carl Anderson in

Question # 25

Newton's law of motion do not hold in

Question # 26

The mass of an object will be doubled at speed

Question # 27

At the temperature, a body emits radiation which is principally

Question # 28

Electromagnetic -radiation means:

Question # 29

The existence of position was predicted by Dirace in

Question # 30

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
2 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
3 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
4 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)
5 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
6 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
7 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
8 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
9 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
10 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these

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