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 body reaches a speed equal to the speed of light, then its mass will became

Question # 2

The special theory of relativity is based on the

Question # 3

Compton was awarded Nobel prize in physics in

Question # 4

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 5

When platinum wire is heated, it appears cherry red at

Question # 6

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 7

When a position comes close to an electron they annihilate into

Question # 8

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

Question # 9

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

Question # 10

The unit of work function is:

Question # 11

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 12

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 13

A photon is considered to have

Question # 14

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

Question # 15

The idea of quantization of energy was proposed by:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 the dilation of time applies to the timing processes which are:
A. Physical
B. Chemical
C. Biological
D. All of these
3 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
4 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
5 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
6 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
7 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
8 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
9 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
10 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature

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