Heat and thermodynamics

The first law of thermodynamics is a statement of conservation of:

• 1 Energy
• 2 Mass
• 3 Charge
• 4 Momentum

For an isothermal process the temperature is:

• 1 Rising
• 2 Constant
• 3 Falling
• 4 Zero

In an adiabatic process, there is no:

• 1 Pressure
• 2 Work
• 3 Heat exchange
• 4 Volume change

The efficiency of a Carnot engine working between 400 K and 300 K is:

• 1 75 percent
• 2 25 percent
• 3 33 percent
• 4 100 percent

Entropy of an isolated system tends to:

• 1 Stay zero
• 2 Decrease
• 3 Become negative
• 4 Increase

The molar gas constant R is about:

• 1 8.31 J/mol K
• 2 83.1 J/mol K
• 3 0.0821 J/mol K
• 4 1.38 J/mol K