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

In order to produce pair production, a photon must have a energy

Question # 2

When platinum wire is heated, it appears cherry red at

Question # 3

There is no way to detect:

Question # 4

From the theory of relativity, momentum p of the photon is related to energy as

Question # 5

When a platinum wire is heated, it appears yellow at

Question # 6

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

Question # 7

A photon is considered to have

Question # 8

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 9

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

Question # 10

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 11

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 12

The mass of an object will be doubled at speed

Question # 13

The general theory of relativity treats problems involving

Question # 14

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 15

The energy of photon 'E' is proported to

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
3 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
5 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
6 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
7 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
8 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
9 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2
10 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these

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