Heat Thermodynamics Test

Result

Heat Thermodynamics Test - 6

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Question 1
1 / -0

The following question has four choices out of which ONLY ONE is correct.

During the melting of a slab of ice at 273 K at atmospheric pressure,

A
positive work is done by the ice water system on the atmosphere

B
positive work is done on the ice water system by the atmosphere

C
internal energy of ice water system decreases

D
None of the above

Solution

There is a decrease in volume during melting on an ice slab at 273K. Therefore, negative work is done by ice-water system on the atmosphere or positive work is done on the ice-water system by the atmosphere. Secondly, heat is absorbed during melting (i.e. ΔQ is positive) and as we have seen, work done by ice-water system is negative (ΔW is negative). Therefore, from the first law of thermodynamics, ΔU=ΔQ−ΔW. There is an increase in the internal energy.
Question 2
1 / -0

Consider the following statements:

(A) If heat is added to a system, its temperature must always increase.
(B) If positive work is done by a system in a thermodynamic process, its volume must increase.

Choose the correct answer.

A
Both (A) and (B) are correct.

B
(A) is correct, but (B) is wrong.

C
(B) is correct, but (A) is wrong.

D
Both (A) and (B) are wrong.

Solution

Temperature of the system will increase if there is increase in the internal energy of the system, i.e. ∆U > 0

Work done is said to be positive if ∆V > 0.