ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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

The general theory of relativity treats problems involving

Question # 2

Pair production is the phenomenon in which

Question # 3

The special theory of relativity is based on:

Question # 4

The special theory of relativity treats problems invoving

Question # 5

At the temperature, a body emits radiation which is principally

Question # 6

Victor de-Brogile received the Nobel prize in physics in

Question # 7

According to the special theory of relativity, a moving clock

Question # 8

The unit of work function is:

Question # 9

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

Question # 10

Position was discovered by Carl Anderson in

Question # 11

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

Question # 12

The inside cavity of the black body is

Question # 13

the symbol to be used in relativity problems denotes:

Question # 14

Converse of pair production is known as

Question # 15

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
2 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
3 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
4 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 An intertial frame of reference is a frame of reference which is
A. at rest
B. moving with uniform velocity
C. either at rest or moving with uniform velocity
D. none of these
6 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
7 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
8 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
9 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
10 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v

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