Question 1.

What is zeroth law of thermodynamics?

 

Question 2.

Give ‘First law of thermodynamics.

 

Question 3.

What do you understand by “Specific heat capacity”?

 

Question 4.

For gases, define specific heat capacity.

 

Question 5.

Name the thermodynamic state variables.

 

Question 6.

Define:

(a) Isothermal process

(b) Isobaric process

(c) Isochoric process

(d) Adiabatic process

 

Question 7.

Define internal energy of a system.

 

Question 8.

What is quasi-static process?

 

Question 9.

Give expression for work done in an isothermal expansion and in an adiabatic process of ideal gas.

 

Question 10.

What is heat engine and also give expression for its efficiency.

 

Question 11.

A refrigerator is to maintain eatables kept inside at 10⁰C. If room temperature is 32⁰C, calculate the coefficient of performance.

 

Question 12.

An electric heater supplies heat to a system at a rate of 90W. If system performs work at a rate of 55 joules per second. At what rate is the internal energy increasing?

 

Question 13.

A geyser heats water flowing at the rate of 2.0 litres per minute from 25°C to 65°C. If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is 3.0 × 10⁴ J/g?

 

Question 14.

Give symbols, units and dimensions for:

(a) Specific heat capacity.

(b)Thermal conductivity.

 

Question 15.

What is a Carnot engine? Give formula for its efficiency.

 

Question 16.

A steam engine delivers 6.4 × 10¹⁰ J of work per minute and services 4.5 × 10¹¹ J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

 

Question 17.

In changing the state of a gas adiabatically from an equilibrium state A to another equilibrium state B, an amount of work equal to 25 J is done on the system. If the gas is taken from state A to B via a process in which the net heat absorbed by the system is 7.46 cal, how much is the net work done by the system in the latter case? (Take 1 cal = 4.19 J)

 

Question 18.

A geyser heats water flowing at the rate of 5.0 litres per minute from 23°C to 63°C. If the geyser operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is 5.0 × 10⁵ J/g?

 

Question 19.

Give units, symbols and dimensions for the following quantities:

(a) Co-efficient of volume expansion.

(b) Heat supplied to a system.

 

Question 20.

What does second law of thermodynamic state?

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