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

At the temperature, a body emits radiation which is principally

Question # 2

Electromagnetic -radiation means:

Question # 3

When a platinum wire is heated, it appears orange red at

Question # 4

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

Question # 5

Pair production is the phenomenon in which

Question # 6

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 7

The special theory of relativity is based on the

Question # 8

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

Question # 9

Which of the following phenomenon proves the particle nature of light

Question # 10

If a material object moves with the speed of light 'C' its mass becomes

Question # 11

Newton's law of motion do not hold in

Question # 12

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 13

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 14

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

Question # 15

A photon is considered to have

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 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
4 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)
5 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
6 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
8 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
9 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
10 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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