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

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

Question # 2

The special theory of relativity is based on the

Question # 3

Which of the following phenomenon proves the particle nature of light

Question # 4

The Einstein's changes in length, mass and time are not observed in common life because

Question # 5

The special theory of relatively treats the problems involving:

Question # 6

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

Question # 7

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

Question # 8

According to the special theory of relativity, a moving clock

Question # 9

Practically the quantity v/c is always:

Question # 10

The energy of photon 'E' is proported to

Question # 11

Momentum is a parameter associated with

Question # 12

The existence of position was predicted by Dirace in

Question # 13

Which of the following is not an example of intertial frame

Question # 14

Photocell is a device which converts

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity
3 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
4 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
5 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
6 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
8 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
9 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
10 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these

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