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

Strictly speaking, the earth is:

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 4

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

Question # 5

The concept of direction is purely:

Question # 6

When a platinum wire is heated, it appears orange red at

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

When a platinum wire is heated, it appears yellow at

Question # 13

A non-inertial frame of reference is one, in which

Question # 14

Wave nature of particle was proposed by

Question # 15

de-Broglies hypthesis was experimentally verified by

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 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)
3 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
4 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
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 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)
7 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
D. none of these
8 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
9 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
10 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2

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