A gas expands 0.25m³ at constant pressure 10³ N/m², the work done is -

(1) 2.5 ergs

(2) 250 J

(3) 250 W

(4) 250 N

A sample of gas expands from volume V₁ to V₂. The amount of work done by the gas is greatest when the expansion is 

(1) Isothermal

(2) Isobaric

(3) Adiabatic

(4) Equal in all cases

A Container having 1 mole of a gas at a temperature 27°C has a movable piston which maintains constant pressure in a container of 1 atm. The gas is compressed until the temperature becomes 127°C. The work done is:

(1) 703 J

(2) 831 J

(3) 121 J

(4) 2035 J

In a reversible isochoric change -

1. ΔW = 0

2. ΔQ = 0

3. ΔT = 0

4. ΔU = 0

Entropy of a thermodynamic system does not change when this system is used for -

(1) Conduction of heat from a hot reservoir to a cold reservoir

(2) Conversion of heat into work isobarically

(3) Conversion of heat into internal energy isochorically

(4) Conversion of work into heat isochorically

Which is incorrect ?

(1) In an isobaric process, Δp = 0

(2) In an isochoric process, ΔW = 0

(3) In an isothermal process, ΔT = 0

(4) In an isothermal process, ΔQ = 0

A Carnot engine working between 300 K and 600K has work output of 800 J per cycle. What is amount of heat energy supplied to the engine from source per cycle ?

(1) 1800 J/cycle

(2) 1000 J/cycle

(3) 2000 J/cycle

(4) 1600 J/cycle

If the door of a refrigerator is kept open, then which of the following is true ?

1. Room is cooled

2. Room is heated

3. Room is either cooled or heated

4. Room is neither cooled nor heated

In a cyclic process, the internal energy of the gas: