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

The special theory of relativity is based on:

Question # 2

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

Question # 3

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

Question # 4

Compton was awarded Nobel prize in physics in

Question # 5

Strictly speaking, the earth is:

Question # 6

From the theory of relativity, momentum p of the photon is related to energy as

Question # 7

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

Question # 8

Intensity of light determines the:

Question # 9

When a platinum wire is heated, it appears white at

Question # 10

The value of the Stephen's constant for black body radiations is given by

Question # 11

de-Broglies hypthesis was experimentally verified by

Question # 12

Position was discovered by Carl Anderson in

Question # 13

Wave nature of particle was proposed by

Question # 14

When platinum wire is heated, it appears cherry red at

Question # 15

In order to produce pair production, a photon must have a energy

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
2 The length contraction happens only
A. Opposite to the direction of motion
B. along the direction of motion
C. perpendicular to the direction of motion
D. In any direction
3 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)
4 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
5 The positron was discovered by:
A. In cosmic radiation
B. In 1932
C. By Carl Anderson
D. All above
6 According to the special theory of relativity, time is
A. absolute quantity
B. not absolute quantity
C. constant quantity
D. none of these
7 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
8 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
9 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
10 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White

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