# 02 UNIT 5 PHYSICS STUDENT.pdf

## 02 UNIT 5 PHYSICS STUDENT.pdf

✓ Thermodynamics
Q.1 If an ideal gas is isothermally expanded, its internal energy
A. Decreases B. Remains same
C. Increases D. None of these
Q.2 The first law of thermodynamics is concerned with conservation of
A. Molecules B. Moles
C. Energy D. Temperature
Q.3 In an isothermal change an ideal gas obeys
A. Charles Law B. Boyle’s Law
C. Both “A” and “B” D. None of these
Q.4 If 20J of work is done in compressing a gas adiabatically the change in internal
energy is equal to
A. 20J B. 10J
C. -20J D. 200J
Q.5 During adiabatic compression of a gas its temperature
A. Remains constant B. Falls
C. Become zero D. Rise
Q.6 A system does 600J of work at the same time has its internal energy increased by
320J. How much heat has been supplied.
A. 280 J B. 600 J
C. 920 J D. 20 J
Q.7 The internal energy of a monoatomic ideal gas is
A. Only kinetic energy B. Partly kinetic and partly potential energies
C. Only potential energy D. None of these
Q.8 The direction of flow of heat between two bodies is determined by
A. Internal energy B. Total energy
C. Kinetic energy D. None of these
Q.9 What will be the mathematical form of first law of thermodynamics for a system
whose variation of volume by pressure is shown?