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 general theory of relativity treats problems involving

Question # 2

The existence of position was predicted by Dirace in

Question # 3

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 4

the symbol to be used in relativity problems denotes:

Question # 5

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

Question # 6

When the atomic particle are moving with velocities approaching that of light:

Question # 7

According to the Max plank, energy is redialed or absorbed in

Question # 8

The special theory of relatively treats the problems involving:

Question # 9

S.I. unit of planks constant is

Question # 10

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 11

Intensity of light determines the:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Position was discovered by Carl Anderson in

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When a platinum wire is heated, it appears white at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
2 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
3 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
4 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
5 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
6 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
7 Photoelectric effect takes place with a photon of:
A. Very high energy
B. Very low energy
C. Low energy
D. High energy
8 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
9 A non-inertial frame of reference is one, in which
A. law of inertial is valid
B. all laws of physics are the same in all frames
C. a>0 or a<0
D. a=0
10 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero

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