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

The unit of work function is:

Question # 2

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

Question # 3

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

Question # 4

When a position comes close to an electron they annihilate into

Question # 5

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

Question # 6

The inside cavity of the black body is

Question # 7

As the light shines on the metal surface, the electrons are ejected

Question # 8

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 9

The special theory of relativity treats problems invoving

Question # 10

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 11

Electromagnetic -radiation means:

Question # 12

When a position comes close to an electron they annihilate into photons such that

Question # 13

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

Question # 14

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

Question # 15

The concept of direction is purely:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
2 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
3 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
4 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
5 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
6 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
8 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
9 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
10 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

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