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

At the temperature, a body emits radiation which is principally

Question # 2

Compton shift refers to:

Question # 3

In photoelectric effect the energy of ejected electrons depend on

Question # 4

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

Question # 5

The concept of direction and position are purely

Question # 6

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

Question # 7

Strictly speaking, the earth is:

Question # 8

Photoelectric effect takes place with a photon of:

Question # 9

The idea of quantization of energy was proposed by:

Question # 10

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 11

The existence of position was predicted by Dirace in

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 16

S.I. unit of planks constant is

Question # 17

The special theory of relativity treats problems invoving

Question # 18

Which of the following phenomenon proves the particle nature of light

Question # 19

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

Question # 20

With the help of 50 K v electron microscope, a resolution of

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

Electromagnetic radiation or photons interact with matter in

Question # 25

de-Broglies hypthesis was experimentally verified by

Question # 26

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

Question # 27

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 28

The length contraction happens only

Question # 29

The energy of photon 'E' is proported to

Question # 30

The unit of work function is:

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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 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
3 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these
4 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
5 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
6 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
7 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
8 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
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 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

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