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mcq on Thermodynamics Physics. We covered all the mcq on Thermodynamics Physics in this post for free so that you can practice well for the exam.
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mcq on Thermodynamics Physics for Students
When the pressure of a gas in a sealed container is increased by 1%, its temperature rises by 1°C. What was the original temperature of the gas?
a) 100°C
b) 100 K
c) 250°C
d) 200 K
Option b – 100 K
At what temperature will hydrogen molecules have the same root mean square speed as oxygen molecules at 47°C?
a) 80 K
b) 20 K
c) 20°C
d) None of the above
Option b – 20 K
How does the intermolecular force between gas molecules vary with distance at a constant temperature?
a) Decreases first, then increases
b) Continuously increases
c) Continuously decreases
d) None of the above
Option a – Decreases first, then increases
Two cylinders containing equal amounts of ideal diatomic gas at 300 K are heated with the same energy. In Cylinder A, the piston is movable, while in Cylinder B, it is fixed. If the temperature in A increases by 30 K, what is the temperature increase in B?
a) 42 K
b) 18 K
c) 30 K
d) 50 K
Option a – 42 K
The first law of Thermodynamics is derived from which of the following fundamental principles?
a) Charles’s Law
b) Conservation of energy
c) Newton’s Law
d) Law of Heat exchange
Option b – Conservation of energy
A gas with initial pressure PPP and volume VVV is compressed adiabatically to one thirty-second of its volume. What will be the final pressure?
a) 32P
b) 128
c) 128P
d) P/128
Option c – 128P
What happens to the internal energy of an ideal gas during an isothermal expansion?
a) It decreases
b) It increases
c) It remains unchanged
d) First increases, then decreases
Option c – It remains unchanged
During an adiabatic transformation, the work done by an ideal gas depends only on which factor?
a) Change in temperature
b) Change in pressure
c) Change in volume
d) None of the above
Option a – Change in temperature
If 100 grams of ice at 0°C is mixed with 100 grams of water at 80°C, what will be the final temperature? (Latent Heat of fusion = 540 cal/g, Specific Heat of water = 1 cal/g°C)
a) 40°C
b) 10°C
c) 20°C
d) 0°C
Option d – 0°C
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