2nd Law of Thermodynamics
Trending Questions
Q. Find the change in the entropy in the following process 100 gm of ice at 0∘C melts when dropped in a bucket of water at 50∘C (Assume temperature of water does not change)
- +5.4 cal/K
- – 5.4 cal/K
- – 4.5 cal/K
- + 4.5 cal/K
Q. Assertion: A room can be cooled by opening the door of a refrigerator in a closed room.
Reason: Heat flows from lower temperature (refrigerator) to higher temperature (room).
Reason: Heat flows from lower temperature (refrigerator) to higher temperature (room).
- If both assertion and reason are true but reason is not the correct explanation of the assertion.
- If both assertion and reason are true and the reason is the correct explanation of the assertion.
- If the assertion and reason both are false.
- If assertion is true but reason is false.
- If assertion is false but reason is true.
Q. Which of the following statements is correct according to the second law of thermodynamics?
- All heat can be converted into work
- All heat cannot be converted into work
- Both (a) and (b) are correct.
- Both (a) and (b) are wrong.
Q. Which of the following statement is true as per the second law of thermodynamics for an isolated, ordered system?
- Heat will flow into the system
- Heat will flow out of the system
- Work will be done by the system
- Work will be done on the system
- The entropy withing the system will increase
Q. For the conversion of liquid into a solid :
- orderliness decreases and entropy decreases
- orderliness increases and entropy decreases
- both are not related
- orderliness increases and entropy increases
Q. Heat cannot by itself flow from a body at lower temperature to a body at higher temperature is a statement of consequence of
- second law of thermodynamics
- conservation of momentum
- first law of thermodynamics.
- conservation of mass
Q. One mole of oxygen is expanded from a volume 1 ℓ to 2ℓ at a constant temperature T=280 K. Find the change in internal energy of the gas.
- 9.8 kJ
- 0 kJ
- 12.8 kJ
- 2.8 kJ
Q. Which of the following expressions is known as Clausius inequality?
- ∮dqT≤0
- ∮dqT=0
- ∮Tdq≤0
- ∮dqT≥≤0
Q. Which statement is true for second law of thermodynamics ?
- Heat can flow spontaneously from a cold object to a hot object.
- You can not create a heat engine which extracts heat and converts it all to useful work.
- According to Plank-Kelvin's law under some circumstances a perfect heat engine is possible.
- None of these.
Q. Which of the following is not a path function ?
- Δ Q
- Δ Q + Δ W
- Δ W
- Δ Q - Δ W