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

Intensity of light determines the:

Question # 3

The photon of radio-waves has energy of about

Question # 4

Momentum is a parameter associated with

Question # 5

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

Question # 6

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

Question # 7

Compton was awarded Nobel prize in physics in

Question # 8

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

Question # 9

The year when A.H. compton was awarded Nobel Prize is:

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

Electromagnetic radiation or photons interact with matter in

Question # 12

Converse of pair production is known as

Question # 13

When platinum wire is heated, it appears cherry red at

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
2 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
3 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
4 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
5 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
6 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
7 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
8 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
9 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
10 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C

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