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Physics -- Heat and Thermodynamics
11.
The pressure p of a gas is plotted against its absolute temperature T for two different constant volumes V1 and V2, where V1 > V2. p is plotted on the y-axis and T on the x-axis.
- A.The curve for V1 has greater slope than the curve for V2.
- B.The curve for V2 has greater slope than the curve for V1.
- C.The curves must intersect at some point other than T 0.
- D.The curves have the same slope and do not intersect.
- Answer
- Report
Answer : [B]
12.
The average degree of freedom per molecule for a gas is 6. The gas performs 25 J of work when it expands at constant pressure. The heat absorbed by the gas is
- A.75 J
- B.100 J
- C.150 J
- D.125 J
- Answer
- Report
Answer : [B]
13.
Two cylinders A and B, fitted with pistons, contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is free to move, while that of B is held fixed. The same amount of heat is
given to the gas in each cylinder. If the rise in temperature of the
gas in A is 30 K then the rise in temperature of the gas in B is
- A.30 K
- B.18 K
- C.50 K
- D.42 K
- Answer
- Report
Answer : [D]
14.
A system is taken from state A to state B along two different
paths 1 and 2. The heat absorbed and work done by the system
along these two paths are Q1 and Q2, and W1 and W2
respectively.
- A.Q1 = Q2
- B.W1 = W2
- C.Q1 - W1 = Q2 - W2
- D.Q1 + W1 = Q2 + W2
- Answer
- Report
Answer : [C]
15.
If water at 0oC, kept in a container with an open top, is placed in
a large evacuated chamber,
- A.all the water will vaporize
- B.all the water will freeze
- C.part of the water will vaporize and the rest will freeze
- D.ice, water and water vapour will be formed and reach equilibrium at the triple point
- Answer
- Report
Answer : [C]
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