Kinetic Theory & Thermodynamics Test

Result

Kinetic Theory & Thermodynamics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

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

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

B
internal energy of the ice - water system decreases

C
internal energy of the ice - water system increases

D
positive work is done by the ice - water system on the atmosphere

Solution

There is a decrease in volume during melting of an ice slab at 273 K. Therefore, negative work is done "by” the ice - water system on the atmosphere OR positive work is done "on” the ice-water system by the atmosphere.

Also, as 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 first law of thermodynamics
ΔU = ΔQ - ΔW ,

change in internal energy of ice-water system, will be positive i.e., internal energy will increase.

The correct answer is: positive work is done on the ice - water system by the atmosphere, internal energy of the ice - water system increases
Question 2
1 / -0

Statement-1: When temperature increases, coefficient of viscosity of a gas decreases.

Statement-2: Gases behave more like ideal gases at higher temperature.

A
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.

B
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

C
Statement-1 is true but Statement-2 is false.

D
Statement-1 is false but Statement-2 is true.

Solution

As temperature increases coefficient of viscosity of a gas increases.
However, statement – 2 is true.

The correct answer is: Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.