Thermodynamics

Two systems are in thermal equilibrium. The quantity which is common for them is

• Temperature

• Specific heat

• Momentum

• Heat

If amount of heat given to a system is 50 J and work done on the system is 15 J, then change in internal energy of the system is

• 35J

• 65J

• .50J

• 15J

The ratio of Wisothermal to Wadiobatic during same expansion is

• >1

• =1

• <1

• Zero

A gas in an insulated cylinder is compressed rapidly and its internal energy increases by 25 J. Work done during this process is

• 25J

• –25 J

• 50J

• –50 J

All of the following about adiabatic compression are incorrect except

• Pressure increases but temperature remains constant

• Pressure and temperature increases but volume decreases

• Pressure and volume decreases but temperature increases

• Pressure increases but temperature decreases

A thermodynamics system undergoes a process in which its internal energy decreases by 100 J and at the same time 120 J work is done on the system. Heat transfer is

• 20J

• –220 J

• 220 J

• –20 J

The work done on the system is taken as

• Zero

• Negative

• Same

• Positive

The equation Q = U in thermodynamic represents an

• Isochoric process

• Isothermal processes

• Adiabatic processes

• Isobaric processes

The direction of flow of heat between two bodies is determined by

• None of these

• Kinetic energy

• Total energy

• Internal energy

A system undergoes an adiabatic process in which its internal energy increases by 20 J. Which of the following statements is true?

• The system received 20 J of energy as heat

• 20 J of work was done by the system

• The system lost 20 J of energy as heat

• 20 J of work was done on the system