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

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

Question # 2

Due to relative motion of observer and the frame of reference of events, time always:

Question # 3

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 4

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 5

The positron was discovered by:

Question # 6

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 7

At the temperature, a body emits radiation which is principally

Question # 8

Newton's law of motion do not hold in

Question # 9

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

Question # 10

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

Question # 11

Davision and Germer performed experiment to verify

Question # 12

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

Question # 13

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

Question # 14

Wave nature of particle was proposed by

Question # 15

Intensity of light determines the:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
2 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
3 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
4 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
5 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
6 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
7 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
8 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
9 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
10 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

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