Paper 1 Thermal Physics A Answers

Q	Ans	Brief reason
1	B	Temperature predicts net heat-flow direction.
2	B	Thermal equilibrium means no net heat flow.
3	B	Thermometer property must be reliable and monotonic.
4	A	$-40+273.15=233\mathrm{K}$.
5	A	From $E=mc\Delta T$.
6	A	Temperature-rise equation.
7	B	Latent heat equation.
8	A	Energy goes into change of state.
9	B	$E\propto c$.
10	A	Electrical energy for steady values.
11	B	Some input energy leaves the sample.
12	B	Energy changes state, not temperature.
13	A	Conservation of energy with losses if present.
14	B	Kelvin ${=}^{\circ }$C + 273.15.
15	B	Definition of absolute zero on Celsius scale.
16	A	Fusion is melting/freezing.
17	B	Vaporisation greatly increases molecular separation.
18	A	Temperature intervals are equal in kelvin and Celsius.
19	B	Minimises energy absorbed/lost by apparatus.
20	A	Heat capacity is for the whole object.