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

When a position comes close to an electron they annihilate into

Question # 2

The year when A.H. compton was awarded Nobel Prize is:

Question # 3

When a platinum wire is heated, it appears orange red at

Question # 4

According to the special theory of relativity, time is

Question # 5

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

Question # 6

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 7

Intensity of light determines the:

Question # 8

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 9

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 10

Photoelectric effect takes place with a photon of:

Question # 11

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

Question # 12

Converse of pair production is known as

Question # 13

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 14

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

Question # 15

The unit of work function is:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
2 Pair production is the phenomenon in which
A. matter is converted into energy
B. energy is converted into matter
C. light is converted into electrical energy
D. electrical energy is converted into light
3 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
4 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
5 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
6 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
7 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
8 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
9 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
A. 100 ev
B. 106e v
C. 103e v
D. 1.0 e v
10 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935

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