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 energy of photon 'E' is proported to

Question # 2

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

Question # 3

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

Question # 4

When a platinum wire is heated, it appears yellow at

Question # 5

The existence of position was predicted by Dirace in

Question # 6

Photocell is a device which converts

Question # 7

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 8

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

Question # 9

Wave nature of particle was proposed by

Question # 10

The special theory of relativity is based on the

Question # 11

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 12

The value of the Stephen's constant for black body radiations is given by

Question # 13

According to the special theory of relativity, a moving clock

Question # 14

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

Question # 15

When a platinum wire is heated, it appears white at

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
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 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
4 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
5 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
6 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
7 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
8 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
9 The inside cavity of the black body is
A. painted white
B. painted silver
C. blackened with soot
D. painted red
10 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these

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