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

Compton was awarded Nobel prize in physics in

Question # 2

Electromagnetic radiation or photons interact with matter in

Question # 3

The unit of work function is:

Question # 4

There is no way to detect:

Question # 5

The energy of photon 'E' is proported to

Question # 6

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 7

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

Question # 8

S.I. unit of planks constant is

Question # 9

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 10

Position was discovered by Carl Anderson in

Question # 11

Pair production is the phenomenon in which

Question # 12

Wave nature of particle was proposed by

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
2 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
3 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
4 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
5 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
6 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
7 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
8 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
9 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
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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