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 position comes close to an electron they annihilate into

Question # 2

Newton's law of motion do not hold in

Question # 3

S.I. unit of planks constant is

Question # 4

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

Question # 5

Position was discovered by Carl Anderson in

Question # 6

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

Question # 7

the dilation of time applies to the timing processes which are:

Question # 8

A photon is considered to have

Question # 9

The positron was discovered by:

Question # 10

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

Question # 11

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 12

The value of threshold frequency for different metals is

Question # 13

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

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

Which one of the following physical quantities changes with relativistic speed

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
2 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
3 The value of the plank's constant 'h' is given by
A. 1.6 x 10-19J
B. 1.67 x 10-27Kg
C. 6.63 x 1034Js
D. 6.63 x 10-34Js
4 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
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
7 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
8 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
9 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
10 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

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