Thermodynamics

Zeroth law of thermodynamics is:

• Kinetic energy of molecules of a gas is zero

• Ideal gas does not contain molecules

• If two systems are thermal equilibrium third one is also in equilibrium

• Absolute zero temperature cannot be obtained

Transfer of heat from low temperature to high temperature is

• None of these

• Possible by doing some external work

• Possible by keeping both the bodies in contact

• Impossible

An adiabatic process occurs at constant

• Temperature

• pressure

• heat

• none of these

The physics of the refrigerator closely resembles the

• Ice formation

• Heat engine

• Vapour compression machin

• vaporization of water

A piece of ice is added to water in a cup. The entropy

• decreased

• increased

• no change

• decreases then increases.

Human body is a __________________ system

• open

• closed

• isolated

A definite area or space where some thermodynamic process takes place is known as

• (A)thermodynamic system

• (b) thermodynamic cycle

• (c) thermodynamic process

• (c) thermodynamic process

According to kinetic theory of heat

• (a) temperature should rise during boiling

• (b) temperature should fall during freezing

• (c) at low temperature all bodies are in solid state

• (d) at absolute zero there is absolutely no vibration of molecules

• (e) none of the above

Absolute zero temperature is taken as

• (a) – 273°C

• (b) 273°C

• (c) 237°C

• (d) – 373°C.

A system is in thermodynamic equilibrium

• if temperature and pressure at all points are same

• if temperature and pressure at all points are not same

• if temperature at all points are same

• if pressure at all points are same