ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

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

Question # 3

The general theory of relativity treats problems involving

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

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

Question # 6

Strictly speaking, the earth is:

Question # 7

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

Question # 8

Electromagnetic -radiation means:

Question # 9

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

Question # 10

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

Question # 11

Wave nature of particle was proposed by

Question # 12

With the help of 50 K v electron microscope, a resolution of

Question # 13

The special theory of relativity treats problems invoving

Question # 14

The inside cavity of the black body is

Question # 15

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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)
2 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
3 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
4 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
5 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
6 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
8 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
9 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
10 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

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