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

When a position comes close to an electron they annihilate into

Question # 2

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

Question # 3

the dilation of time applies to the timing processes which are:

Question # 4

Davision and Germer performed experiment to verify

Question # 5

The special theory of relativity is based on:

Question # 6

The nature of radiations emitted by a hot body depends upon its:

Question # 7

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

Question # 8

The Stephen-Boltzmann law for the black body radiation is given by

Question # 9

At the temperature, a body emits radiation which is principally

Question # 10

the symbol to be used in relativity problems denotes:

Question # 11

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

Question # 12

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 13

The special theory of relativity treats problems invoving

Question # 14

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

Question # 15

Which of the following phenomenon proves the particle nature of light

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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 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
4 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
5 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
6 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
7 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)
8 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
9 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
10 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

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