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

The existence of position was predicted by Dirace in

Question # 2

According to the Max plank, energy is redialed or absorbed in

Question # 3

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 4

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

Question # 5

Absolute motion cannot be detected

Question # 6

The special theory of relativity is based on the

Question # 7

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

Question # 8

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 9

From the theory of relativity, momentum p of the photon is related to energy as

Question # 10

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

Question # 11

Wave nature of particle was proposed by

Question # 12

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

Question # 13

When a position comes close to an electron they annihilate into

Question # 14

According to the special theory of relativity, a moving clock

Question # 15

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
2 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
3 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
4 Wien's constant is measured in:
A. Metre per kelviin
B. Metre kelvin
C. Kelvin per meter
D. Joules
5 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
6 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
7 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
8 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
9 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
10 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)

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