What does green energy development entail?

1. Green energy involves finding new ways to harness clean and renewable alternative energy sources.
2. Green energy involves finding new ways to conserve alternative energy sources.
3. Green energy involves decreasing the efficiency of nonrenewable energy resources.
4. Green energy involves finding new ways to harness nonrenewable energy resources.

Why are the sun and Earth not in thermal equilibrium?

1. The mass of the sun is much greater than the mass of Earth.
2. There is a vast amount of empty space between the sun and Earth.
3. The diameter of the sun is much greater than the diameter of Earth.
4. The sun is in thermal contact with Earth.

If a fixed quantity of an ideal gas is held at a constant volume, which variable relates to pressure, and what is that relation?

1. Temperature; inverse proportionality $\left(P\propto \frac{\text{1}}{T}\right)$
2. Temperature, direct proportionality to square root $\left(P\propto \sqrt{T}\right)$
3. Temperature; direct proportionality $\left(P\propto T\right)$
4. Temperature; direct proportionality to square $\left(P\propto T^{\text{2}}\right)$

1. Entropy depends on the change of phase of a system, but not on any other state conditions.
2. Entropy does not depend on how the final state is reached from the initial state.
3. Entropy is least when the path between the initial state and the final state is the shortest.
4. Entropy is least when the path between the initial state and the final state is the longest.

Which sort of thermal energy do molecules in a solid possess?

1. electric potential energy
2. gravitational potential energy
3. translational kinetic energy
4. vibrational kinetic energy

1. the first law of thermodynamics
2. the second law of thermodynamics
3. the third law of thermodynamics
4. the zeroth law of thermodynamics

1. by doing work on the system
2. by having work done by the system
3. by increasing the specific heat of the cold body
4. by increasing the specific heat of the hot body

What is the change in entropy caused by melting 5.00 kg of ice at 0 °C ?

1. 0 J/K
2. 6.11×10³ J/K
3. 6.11×10⁴ J/K
4. ∞J/K

1. $1.1\times {10}^1\text{J}$
2. $1.1\times {10}^2\text{J}$
3. $1.4\times {10}^3\text{J}$
4. $1.4\times {10}^4\text{J}$

1. The evaporator converts gaseous refrigerant into liquid.
2. The evaporator converts solid refrigerant into liquid.
3. The evaporator converts solid refrigerant into gas.
4. The evaporator converts liquid refrigerant into gas.

1. the condenser
2. the compressor
3. the evaporator
4. the thermostat

What is one example for which calculating thermal efficiency is of interest?

1. A wind turbine
2. An electric pump
3. A bicycle
4. A car engine

1. $Eff=W\sqrt{Q_{\text{c}}}$
2. $Eff=\frac{W}{Q_{\text{c}}}$
3. $Eff=Q_{\text{c}}\times W$
4. $Eff=\frac{Q_{\text{c}}}{W}$

1. $Eff=\frac{Q_{\text{h}}}{Q_{\text{h}}-Q_{\text{c}}}$
2. $Eff=\frac{Q_{\text{h}}}{Q_{\text{c}}}$
3. $Eff=\frac{Q_{\text{c}}}{Q_{\text{h}}}$
4. $Eff=\frac{Q_{\text{h}}-Q_{\text{c}}}{Q_{\text{h}}}$

1. percentage efficiency $=(Eff+100)\mathrm{\%}$
2. percentage efficiency $=\frac{Eff}{100}\mathrm{\%}$
3. percentage efficiency $=(Eff-100)\mathrm{\%}$
4. percentage efficiency $=Eff\times 100\mathrm{\%}$