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

According to the special theory of relativity, time is

Question # 2

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

Question # 3

When a position comes close to an electron they annihilate into

Question # 4

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 5

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

Question # 6

The energy of photon 'E' is proported to

Question # 7

A black body is

Question # 8

The value of the plank's constant 'h' is given by

Question # 9

The value of threshold frequency for different metals is

Question # 10

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 11

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

Question # 12

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 13

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 14

In photoelectric effect the energy of ejected electrons depend on

Question # 15

The photon of radio-waves has energy of about

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
2 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
3 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
4 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
5 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
6 Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
A. 1890
B. 1895
C. 1900
D. 1905
7 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
8 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
9 Davision and Germer performed experiment to verify
A. de-Brogile hypothesis
B. theory of relativity
C. Newton's law of gravitation
D. Mass-energy relation
10 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932

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