ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT 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

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

Question # 3

Wien's constant is measured in:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Electromagnetic radiation or photons interact with matter in

Question # 8

Electromagnetic -radiation means:

Question # 9

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

Question # 10

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 # 11

The length contraction happens only

Question # 12

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

Question # 13

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 14

Which of the following is not an example of intertial frame

Question # 15

Absolute motion cannot be detected

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
2 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
3 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
4 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
5 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
6 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
7 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
8 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
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 Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford

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