Physics Quiz on Gas Laws and Thermodynamics

The specific heat of a gas in an isothermal process is

• a.      Zero 

• a.      Negative

• a.      Remains constant

• a.      Infinite

The specific heat of a gas in an adiabatic process is

•      Zero 

•       Negative

•     Remains constant

•      Infinite

An ideal gas is taken in a sealed container at 300 K. it is heated at constant volume to a temperature 600 K. the mean kinetic energy of its molecules is

• a.      Halved

• a.      Doubled

• a.      Tripled

• a.      Quadrupled

Answer explanation

KE = 3/2 KT

A diatomic gas, compressed isobarically, did 42 J of work. Which was the amount of heat given to the gas during such process?

• a.  147 J

• a.                  137 J

• a.                  127 J

• 117J

1.80 mol of an ideal gas is taken from a volume of 3.00 m3 to a volume of 1.50 m3 via an isothermal compression at 30oC. How much energy is transferred as heat during the compression?

• a.                  – 3140 J

• a.                  –3,14 J

• a.                  – 314 J

• a.                  – 31.4 J

What is true about entropy?

• a. if it increases in one place, it must decrease elsewhere

• b. If it decreases in one place, it must increase elsewhere

• c. It must decrease in the universec. It must decrease in the universe

• d. It must stay constant in the universe

Which of the following is the unit of specific heat?

• J kg/°C

• J/kg°C

• kg °C/J

• J kg/°C2

The quantity PV/kT (k = Boltzmann's constant) represents: Number of moles of the gas Total mass of the gas Number of molecules in the gas Density of the gas

• Number of moles of the gas

• Total mass of the gas

• Number of molecules in the gas

• Density of the gas

The change internal energy in a cyclic process is ___________

• a. Zero

• b. Infinity

• c. Constant

• d. Unity

According to First law of thermodynamics,

• a. total internal energy of a system during a process remains constant

• b. total energy of a system remains constant

• c. work done by a system is equal to the heat transferred by the system

• d. internal energy, enthalpy and entropy during a process remains constant