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

A photon is considered to have

Question # 2

As the light shines on the metal surface, the electrons are ejected

Question # 3

According to the special theory of relativity, time is

Question # 4

Practically the quantity v/c is always:

Question # 5

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

Question # 6

The concept of direction is purely:

Question # 7

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 8

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 9

Absolute motion cannot be detected

Question # 10

The unit of work function is:

Question # 11

The value of the plank's constant 'h' is given by

Question # 12

The special theory of relativity is based on the

Question # 13

When platinum wire is heated, it appears cherry red at

Question # 14

0.1 kg mass will be equivalent to the energy

Question # 15

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
2 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
3 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
4 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
5 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
6 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
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
9 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
10 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules

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