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

In order to produce pair production, a photon must have a energy

Question # 2

de-Broglies hypthesis was experimentally verified by

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

The special theory of relatively treats the problems involving:

Question # 8

In photoelectric effect the energy of ejected electrons depend on

Question # 9

The energy of a photon is represented by

Question # 10

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 11

The energy of photon 'E' is proported to

Question # 12

Wave nature of particle was proposed by

Question # 13

As the light shines on the metal surface, the electrons are ejected

Question # 14

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

Question # 15

When a platinum wire is heated, it appears dull red at about

Question # 16

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

Question # 17

The photon of radio-waves has energy of about

Question # 18

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

The positron was discovered by:

Question # 25

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

Question # 26

Which of the following is not an example of intertial frame

Question # 27

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

Question # 28

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

Question # 29

A photon is considered to have

Question # 30

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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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 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
3 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place
A. pair production
B. photoelectric effect
C. Compton effect
D. None of these
4 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
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 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
7 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
8 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
9 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)
10 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only

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