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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 2

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 3

When a platinum wire is heated, it appears white at

Question # 4

Converse of pair production is known as

Question # 5

Position was discovered by Carl Anderson in

Question # 6

According to the Max plank, energy is redialed or absorbed in

Question # 7

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

Question # 8

An intertial frame of reference is a frame of reference which is

Question # 9

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

Question # 10

The concept of direction is purely:

Question # 11

According to the special theory of relativity, time is

Question # 12

Which one of the following physical quantities changes with relativistic speed

Question # 13

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

Question # 14

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

Question # 15

Which of the following is not an example of intertial frame

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
2 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
3 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
4 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
5 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
6 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
7 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
8 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
9 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
10 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson

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