Assertion : Air quickly leaking out of a balloon becomes coolers
Reason : The leaking air undergoes adiabatic expansion.
Reason : The leaking air undergoes adiabatic expansion.
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Thermodynamics questions
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Assertion : Reversible systems are difficult to find in real world.
Reason : Most processes are dissipative in nature
Reason : Most processes are dissipative in nature
Assertion : Air quickly leaking out of a balloon becomes coolers
Reason : The leaking air undergoes adiabatic expansion.
Reason : The leaking air undergoes adiabatic expansion.
Assertion : Reversible systems are difficult to find in real world.
Reason : Most processes are dissipative in nature
Reason : Most processes are dissipative in nature
Assertion : Air quickly leaking out of a balloon becomes coolers
Reason : The leaking air undergoes adiabatic expansion.
Reason : The leaking air undergoes adiabatic expansion.
During an isothermal expansion of an ideal gas
- AIts internal energy decreases
- BIts internal energy does not change
- CThe work done by the gas is equal to the quantity of heat absorbed by it
- ✓Both and are correct
Answer: D.
View full solution →An engine is supposed to operate between two reservoirs at temperature $727^{\circ} \mathrm{C}$ and $227^{\circ} \mathrm{C}$. The maximum possible efficiency of such an engine is
- ✓$1 / 2$
- B$1 / 4$
- C$3 / 4$
- D1
Answer: A.
View full solution →An ideal gas is taken from point $A$ to the point $B$, as shown in the $P$ - $V$ diagram, keeping the temperature constant. The work done in the process is
- A$\left(P_A-P_B\right)\left(V_B-V_A\right)$
- B$\frac{1}{2}\left(P_B-P_A\right)\left(V_B+V_A\right)$
- C$\frac{1}{2}\left(P_B-P_A\right)\left(V_B-V_A\right)$
- ✓$\frac{1}{2}\left(P_B+P_A\right)\left(V_B-V_A\right)$
Answer: D.
View full solution →A Carnot engine whose low temperature reservoir is at $7^{\circ} \mathrm{C}$ has an efficiency of $50 \%$. It is desired to increase the efficiency to $70 \%$. By how many degrees should the temperature of the high temperature reservoir be increased
- A$840 K$
- B$280 K$
- C$560 \mathrm{~K}$
- ✓$380 \mathrm{~K}$
Answer: D.
View full solution →During an isothermal expansion of an ideal gas
- AIts internal energy decreases
- ✓Its internal energy does not change
- CThe work done by the gas is equal to the quantity of heat absorbed by it
- DBoth and are correct
Answer: B.
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