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

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

Question # 2

Electromagnetic radiation or photons interact with matter in

Question # 3

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

Question # 4

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

Question # 5

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 # 6

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

Question # 7

Which of the following phenomenon proves the particle nature of light

Question # 8

When a position comes close to an electron they annihilate into

Question # 9

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

Question # 10

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

Question # 11

The energy of photon 'E' is proported to

Question # 12

In photoelectric effect the energy of ejected electrons depend on

Question # 13

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

Question # 14

0.1 kg mass will be equivalent to the energy

Question # 15

The positron was discovered by:

Question # 16

Photoelectric effect takes place with a photon of:

Question # 17

Which one of the following physical quantities changes with relativistic speed

Question # 18

Victor de-Brogile received the Nobel prize in physics in

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

The general theory of relativity treats problems involving

Question # 23

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

Question # 24

The special theory of relativity treats problems invoving

Question # 25

The energy of the 4th orbit in hydrogen atom is

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

the symbol to be used in relativity problems denotes:

Question # 30

According to the Max plank, energy is redialed or absorbed in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
A. 2.9 s
B. 3.0 s
C. 6.6 s
D. 9.6 s
2 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
3 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
4 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
5 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
6 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
7 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
8 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
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 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer

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