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

A photon is considered to have

Question # 2

A particle having mass and charge equal to that of an electron is called:

Question # 3

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

Question # 4

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

Question # 5

The special theory of relativity treats problems invoving

Question # 6

The mass of an object will be doubled at speed

Question # 7

Photocell is a device which converts

Question # 8

When platinum wire is heated, it appears cherry red at

Question # 9

According to the special theory of relativity

Question # 10

S.I. unit of planks constant is

Question # 11

The energy of the 4th orbit in hydrogen atom is

Question # 12

Electromagnetic -radiation means:

Question # 13

When a platinum wire is heated, it appears dull red at about

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
2 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
3 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
4 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
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 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
7 Strictly speaking, the earth is:
A. An accelerated frame of reference
B. A non-inertial frame of reference
C. An inertial frame of reference
D. A non-accelerated frame of reference
8 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
9 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
10 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v

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