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Home » General Knowledge » Physics Mcqs » Aptitude Test - 15
1.When the movable mirror of a Michaelson Interferometer is shifted through 0.0589 mm, 200 fringes cross the field. What is the wavelength of the light?
A. 5890 Å
B. 5245 Å
C. 4965 Å
D. 5890 Å
2.In Michaelson interferometer, the position of mirror read 0.6025mm and 0.8970mm for a pair of consecutive bright. Mean wavelength of light is 5393 Å. The difference between the two wavelengths is?
A. 3 Å
B. 4 Å
C. 5 Å
D. 3 Å
3.As an object approaches the speed of light, it’s mass becomes?
A. Zero
B. Double
C. Remains Same
D. Zero
4.If the sun radiates energy at the rate of 4 x 1026 Js-1, what is the rate at which its mass is decreasing?
A. 5.54 x 109 kgs-1
B. 4.44 x 109 kgs-1
C. 3.44 x 109 kgs-1
D. 5.54 x 109 kgs-1
5.According to Einstein’s Special Theory of Relativity, laws of physics can be formulated based on?
A. Inertial Frame of Reference
B. Non-Inertial Frame of Reference
C. Both Inertial and Non-Inertial Frame of Reference
D. Inertial Frame of Reference
6.For Einstein’s relation, E2 – p2c2 =?
A. moc2
B. mo2c4
C. moc4
D. moc2
7.A frame of reference has four coordinates, x, y, z, and t is referred to as the
A. Inertial frame of reference
B. Non-inertial frame of reference
C. Space-time reference
D. Inertial frame of reference
8.A man, who weighs 60 kg on earth, weighs 61 kg on a rocket, as measured by an observer on earth. What is the speed of the rocket?
A. 2.5 X 108 m/s
B. 2.5 X 107 m/s
C. 5.5 X 107 m/s
D. 2.5 X 108 m/s
9.The momentum of a photon having energy 1.00 X 10-17 J is?
A. 2.33 X 10-26 kg m/s
B. 3.33 X 10-26 kg m/s
C. 4.33 X 10-26 kg m/s
D. 2.33 X 10-26 kg m/s
10.A rod of length 5 m is moving at a speed of 0.6 c. To an observer sitting perpendicular to the direction of motion, the length appears to be?
A. 5 m
B. 4 m
C. 3 m
D. 5 m
11. If an object reaches the speed of light, it’s length changes to?
A. Infinite
B. Double of the value
C. Half of the value
D. Infinite
12.A 20-year-old person goes at a high speed in a rocket on his birthday. when he comes back to earth after 1 earth year, he would be?
A. 1 year older
B. 2 years older
C. A few months older
D. 1 year older
13.The length of a rod seems shorter to an observer when it moves in a specific direction. What change would he observe when the direction of rod changes by 180o?
A. The rod becomes even smaller
B. The length of the rod increases
C. The length of the rod remains the same
D. The rod becomes even smaller
14.An object of length 1 m is moving at speed 0.5c. To an observer at rest relative to the object, the length of the object seems to be?
A. 0.86 m
B. 0.5 m
C. 1 m
D. 0.86 m
15.How fast does a rocket have to move relative to an observer for its length to be contracted to 95% of its original length?
A. 0.5 c
B. 0.4 c
C. 0.3 c
D. 0.5 c
16.A rod of length 1m moves with a speed of 0.5 c. How much length contraction takes place?
A. 50 %
B. 14 %
C. 10 %
D. 50 %
17.A particle with a lifetime of 2 X 10-6 s moves through the laboratory with a speed of 0.9 c. It’s lifetime, as measured by an observer in the laboratory, is?
A. 2 X 10-6 s
B. 3.2 X 10-6 s
C. 4.6 X 10-6 s
D. 2 X 10-6 s
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