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

0.1 kg mass will be equivalent to the energy

Question # 2

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

Question # 3

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 4

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 5

A photon is considered to have

Question # 6

The special theory of relativity is based on:

Question # 7

As the light shines on the metal surface, the electrons are ejected

Question # 8

If a body reaches a speed equal to the speed of light, then its mass will became

Question # 9

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

Question # 10

There is no way to detect:

Question # 11

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

Question # 12

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

Question # 13

Which of the following phenomenon proves the particle nature of light

Question # 14

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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 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
2 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
3 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
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 the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
6 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
7 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
8 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
9 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
10 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass

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