Heat Practice — Thermodynamics, Specific Heat and Gas Laws
10 problems · instant feedback · full explanations
Thermodynamics is the physics of energy in bulk. Keep heat (energy in transit) and temperature (average kinetic energy) distinct, and let Q = mcΔT and PV = nRT do the heavy lifting.
Q1.
What is the SI unit of heat?
Multiple choice · Easy
Q2.
How much heat is needed to raise 2 kg of water by 10 K? (c_water = 4186 J/(kg·K))
Numerical answer (J) · Easy
Q3.
5000 J of heat is added to 0.5 kg of aluminum (c = 900 J/(kg·K)). By how much does its temperature rise?
Numerical answer (K) · Medium
Q4.
A sealed rigid container of gas is heated so its absolute temperature doubles. What happens to the pressure?
Multiple choice · Medium
Q5.
What is the pressure of 2 mol of ideal gas at 300 K in a 0.05 m³ container? (R = 8.314 J/(mol·K))
Numerical answer (Pa) · Medium
Q6.
True or false: heat and temperature are the same thing.
True / False · Easy
Q7.
A heat engine absorbs 1000 J from a hot reservoir and exhausts 600 J to a cold reservoir. What is its efficiency?
Multiple choice · Medium
Q8.
What is the maximum possible (Carnot) efficiency of an engine operating between 600 K and 300 K? Give your answer as a percent.
Numerical answer (%) · Hard
Q9.
What happens to the entropy of an isolated system over time?
Multiple choice · Hard
Q10.
True or false: absolute zero is 0°C.
True / False · Medium