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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

Momentum is a parameter associated with

Question # 3

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

Question # 4

Intensity of light determines the:

Question # 5

Compton was awarded Nobel prize in physics in

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Electromagnetic -radiation means:

Question # 12

Compton shift refers to:

Question # 13

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

Question # 14

Position was discovered by Carl Anderson in

Question # 15

The energy of a photon is represented by

Question # 16

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 17

The special theory of relativity is based on the

Question # 18

S.I. unit of planks constant is

Question # 19

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

Question # 20

the symbol to be used in relativity problems denotes:

Question # 21

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 22

A non-inertial frame of reference is one, in which

Question # 23

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

Question # 24

Strictly speaking, the earth is:

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

A black body is

Question # 29

The positron was discovered by:

Question # 30

Practically the quantity v/c is always:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
2 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
3 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
4 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
5 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
6 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
7 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
8 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
9 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
10 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

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