Gearup-JE'19: Thermodynamics Quiz-4

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Question 1

The process of sublimation is found to occur in the case of

• Aliquid nitrogen
• Bsolid CO₂
• Csolid O₂
• Dsteel

Question 2

The temperature of a gas is a measure of _________.

• AAverage distance between gas molecules
• BAverage kinetic energy of gas molecules
• CAverage potential energy of gas molecules
• DNone of these

Question 3

The condition of perfect vacuum, i.e., absolute zero pressure can be attained at ____.

• Aa temperature of -273.16C
• Ba temperature of 0C
• Ca temperature of 273K
• Da negative pressure and 0C temperature

Question 4

If the work done on a closed system is 20 kJ/kg, and 40 kJ/kg heat is rejected from the system, its internal energy decreases by

• A20 kJ/kg
• B60 kJ/kg
• C-20 kJ/kg
• D-60 kJ/kg

Question 5

For a given temperture , as the difference between and increases, the COP of a Carnot heat pump

• Aincreases
• Bdecreases
• Cdoes not change
• Dfirst decreases, then increases

Question 6

Which one of the following is the fluid whose properties in all its three phases are made use of in thermodynamics?

• AAmmonia
• BFreon 12
• CHelium
• DWater

Question 7

When a real gas undergoes Joule-Thomson expansion, the temperature

• Amay remain constant
• Balways increases
• Cmay increases or decreases
• Dalways decreases

Question 8

Clapeyron’s equation is used for finding out the

• ADryness fraction of steam only
• BEntropy of superheated vapour only
• CSpecific volume at any temperature and pressure
• DTotal heat of superheated steam only

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