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

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

Question # 2

According to the special theory of relativity, time is

Question # 3

Which of the following phenomenon proves the particle nature of light

Question # 4

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 5

According to the special theory of relativity, a moving clock

Question # 6

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 7

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 8

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 9

The special theory of relativity treats problems invoving

Question # 10

A non-inertial frame of reference is one, in which

Question # 11

Practically the quantity v/c is always:

Question # 12

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

Question # 13

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

Question # 14

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 15

The positron was discovered by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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)
2 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
3 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
4 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
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 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
7 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
8 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
9 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
10 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v

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