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 platinum wire is heated, it appears white at

Question # 2

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 3

Pair production is the phenomenon in which

Question # 4

The inside cavity of the black body is

Question # 5

Due to relative motion of observer and the frame of reference of events, time always:

Question # 6

Which of the following phenomenon proves the particle nature of light

Question # 7

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 # 8

Which of the following is not an example of intertial frame

Question # 9

If a material object moves with the speed of light 'C' its mass becomes

Question # 10

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 11

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

Question # 12

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

Question # 13

There is no way to detect:

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
3 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
A. 1.66 m
B. 1.66 x 10-10m
C. 1.66 x 10-29cm
D. 1.66 x 10-29m
4 When a position comes close to an electron they annihilate into
A. one photon
B. two photons which travel in the same direction
C. two photons which travels in the opposite direction
D. two photons which travel in any direction
5 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 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
7 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
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 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
10 Due to relative motion of observer and the frame of reference of events, time always:
A. Dilates itself
B. Contracts itself
C. Stretches itself
D. Both (A) and (C)

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