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

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

Question # 2

An intertial frame of reference is a frame of reference which is

Question # 3

There is no way to detect:

Question # 4

The general theory of relativity treats problems involving

Question # 5

The inside cavity of the black body is

Question # 6

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 # 7

An inertial frame is that frame in which

Question # 8

The existence of position was predicted by Dirace in

Question # 9

de-Broglies hypthesis was experimentally verified by

Question # 10

0.1 kg mass will be equivalent to the energy

Question # 11

The Einstein's changes in length, mass and time are not observed in common life because

Question # 12

The year when A.H. compton was awarded Nobel Prize is:

Question # 13

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

Question # 14

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

Question # 15

Intensity of light determines the:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
2 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
3 The nature of radiations emitted by a hot body depends upon its:
A. Metarial
B. Temperature
C. colour
D. Volume
4 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
5 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
6 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
7 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
8 The Einstein's changes in length, mass and time are not observed in common life because
A. We dont observer then seriously
B. The masses are too large
C. Their speed is too small than the speed of right
D. All of the above
9 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
10 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C

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