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

Question # 2

An inertial frame is that frame in which

Question # 3

Momentum is a parameter associated with

Question # 4

Photocell is a device which converts

Question # 5

The value of threshold frequency for different metals is

Question # 6

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

Question # 7

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

Question # 8

The inside cavity of the black body is

Question # 9

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 10

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

Question # 11

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 12

The concept of direction and position are purely

Question # 13

Absolute motion cannot be detected

Question # 14

A black body is

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
2 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
3 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
4 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
5 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
6 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
7 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
8 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
9 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
10 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these

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