ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 3

At the temperature, a body emits radiation which is principally

Question # 4

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 5

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

Question # 6

Victor de-Brogile received the Nobel prize in physics in

Question # 7

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

Question # 8

An inertial frame is that frame in which

Question # 9

Converse of pair production is known as

Question # 10

The positron was discovered by:

Question # 11

The energy of photon 'E' is proported to

Question # 12

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

Question # 13

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 14

Electromagnetic radiation or photons interact with matter in

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
2 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
3 The special theory of relativity is based on the
A. one postulate
B. two postulates
C. three postulates
D. four postulates
4 0.1 kg mass will be equivalent to the energy
A. 9 x 1015J
B. 5 x 108J
C. 6 x 1016J
D. 9 x 10-16J
5 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
6 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
7 In process of annihilation of matter, the two photons produced move in opposite direction to converse
A. momentum
B. charge
C. energy
D. mass
8 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
9 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
10 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons

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