Chapter 18 Thermodynamics
1) The lowest temperature possible in nature is
A) -273 °C.
B) 4 K.
C) 0 °C.
2) Entropy measures
A) temperature as pressure increases.
B) temperature at constant volume.
C) temperature at constant pressure.
D) messiness.
E) temperature as volume increases.
3) Heating the earth's atmosphere is caused by energy
A) consumption. (Earth absorbs energy from the sun)
B) production.
C) both of these.
D) neither of these.
4) A process which takes place at constant temperature is
A) an isothermal process.
B) an adiabatic process.
C) impossible.
5) Suppose you rapidly stir some raw eggs with an eggbeater. The temperature of the eggs will
A) decrease.
B) remain unchanged.
C) increase.
6) When work is done by a system and no heat added to it, the temperature of the system
A) remains unchanged.
B) increases.
C) decreases.
7) When a volume of air is compressed and no heat enters or leaves, the air temperature will
A) decrease.
B) increases.
C) remain unchanged.
8) As a system becomes more disordered, entropy
A) increases.
B) remains the same.
C) decreases.
9) The ideal efficiency for a heat engine operating between temperatures of 2700 K and 300 K is
A) 10%.
B) 24%.
C) 80%.
D) 89%. 1 – 300/2700
E) none of these.
10) Consider a piece of metal that is at 10 °C. If it is heated until it has twice the internal energy, its temperature will be
A) 20 °C. PV = nRT (T must always be in Kelvins)
B) 273 °C.
C) 293 °C. (273°C +10°C) * 2 = 566K 566K – 273°C = 293 °C
D) 566 °C.
E) none of these.