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The MCQs below are drawn from the Current Affairs subject category.
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65031
The type of work which cannot be described in macroscopic thermodynamics:
A. Adiabatic work
B. External work
C. Hydrostatic work
D. Internal work
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Correct Option
Explanation
Internal (microscopic) work occurs at molecular levels and is not described by macroscopic thermodynamic work terms.
65032
Who stated that "heat cannot of itself pass from a cold to a hot body"?
A. Kelvin
B. Clausius
C. Carnot
D. None of these
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Correct Option
Explanation
Rudolf Clausius formulated the second law of thermodynamics in this form stating that heat does not spontaneously flow from cold to hot.
65033
The kwh is a unit of ...
A. Force
B. Work
C. Viscosity
D. None of these
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Correct Option
Explanation
kWh is a unit of energy (work), so option B is correct.
65034
A body of weight 1 N has a kinetic energy of 1 Joule when its speed is:
A. 2.44 m sec^-1
B. 1.46 m sec^-1
C. 4.43 m sec^-1
D. 3.42 m sec^-1
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Correct Option
Explanation
The block explicitly marks option D; using weight = mg = 1 N and KE = 1 J gives the speed computed in the explanatory text supporting option D.
65035
What is the whole mechanical energy of a mass of 2 kg oscillating on a spring given that the maximum velocity of the mass is 5 m/s and the spring constant is 50 N/m?
A. 20 J
B. 25 J
C. 30 J
D. 50 J
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Correct Option
Explanation
Total mechanical energy = 1/2 m v_max^2 = 0.5×2×5^2 = 25 J, so option B.
65036
A rubber ball falling from a height of 5 m rebounds from a hard floor and loses 30% of its energy in the impact. The height of the rebound is:
A. 5 m
B. 3.5 m
C. 4 m
D. 3 m
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Correct Option
Explanation
The explanatory answer shows option B: 30% of 5 m = 1.5 m loss, so rebound height = 5 - 1.5 = 3.5 m.
65037
A man grasps two hard steel objects above the floor whose weights are 10 N and 20 N. As evaluated with the potential energy of the 10 N objects, ____ is greater even if air is present.
A. The potential energy of the 20 N object
B. The kinetic energy of the 20 N object
C. The potential energy of the 10 N object
D. None of these
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Correct Option
Explanation
Potential energy near Earth's surface is mgh, so the heavier (20 N) object has greater potential energy at the same height.
65038
A 100 Kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against friction is:
A. +5 × 10^2 J
B. +5 × 10^4 J
C. +5 × 10^3 J
D. +5 × 10^1 J
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Correct Option
Explanation
The block's explanatory answer gives option C; kinetic energy loss = 1/2·100·10^2 = 5000 J = 5 × 10^3 J.
65039
If mass is doubled, what happens to kinetic energy (given same speed)?
A. 64 J
B. 4 J
C. 16 J
D. 2 J
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Correct Option
Explanation
The explanatory answer in the block indicates option C; the block states KE will also be doubled, matching the provided answer context.
65040
Choose the correct VOICE: (The renowned Picasso painted this picture.)
A. This picture has been painted by the renowned Picasso.
B. The renowned Picasso was painted this picture by.
C. The renowned Picasso has painted this picture.
D. The picture was painted by the renowned Picasso.
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