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 general theory of relativity treats problems involving

Question # 2

Practically the quantity v/c is always:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Which one of the following physical quantities changes with relativistic speed

Question # 7

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 8

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

Question # 9

Compton was awarded Nobel prize in physics in

Question # 10

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

Question # 11

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 12

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 13

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 14

According to the special theory of relativity

Question # 15

According to the special theory of relativity, time is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
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 way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
4 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
5 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
6 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
7 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
8 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
9 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
10 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates

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