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

The energy of a photon is represented by

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 6

Position was discovered by Carl Anderson in

Question # 7

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 8

The special theory of relatively treats the problems involving:

Question # 9

When a position comes close to an electron they annihilate into

Question # 10

Converse of pair production is known as

Question # 11

the symbol to be used in relativity problems denotes:

Question # 12

0.1 kg mass will be equivalent to the energy

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
2 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
3 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
4 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
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 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
7 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
8 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
9 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
10 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm

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