QUESTION PAPER 1

Chapter 10: Thermal Properties of Matter

Original chapter-specific practice paper

Maximum Marks: 40Suggested time: 60 minutes

Instructions: Answer all 20 questions. Marks are shown in brackets. Show calculation steps and units. These are original practice questions, not an official examination paper.

Section A · 1-mark questions — 8 × 1 = 8 marks

What is temperature's role at equilibrium?[1]
Convert 27°C to kelvin.[1]
Specific heat capacity?[1]
Heat for temperature change without phase change?[1]
Latent heat relation?[1]
Heat transfer through vacuum?[1]
Ideal gas equation?[1]
Newton's law of cooling?[1]

Section B · 2-mark questions — 6 × 2 = 12 marks

2 kg warmed 5 K, c=400: Q?[2]
α=1.2×10⁻⁵,L=2m,ΔT=50K: extension?[2]
100°C in kelvin?[2]
Heat capacity of .5 kg with c=800?[2]
Heat to melt .2 kg ice, L=3.34×10⁵?[2]
Why is temperature constant during boiling?[2]

Section C · 3-mark questions — 4 × 3 = 12 marks

.5 kg water c=4200 heated 10°C: heat?[3]
Rod L=2m,α=1.5×10⁻⁵,ΔT=40K: expansion?[3]
Mix .2 kg at 80°C and .3 kg at 20°C, equal c, no heat loss: final T?[3]
Gas at fixed volume warms 300K to 450K; initial p=100kPa. Final p?[3]

Section D · 4-mark questions — 2 × 4 = 8 marks

Describe three heat-transfer modes.[4]
Melt .2 kg ice at 0°C then warm water by 20K; L=3.34×10⁵,c=4200. Total Q?[4]

End of paper — review signs, units and working.

Open marking scheme and model answers

Attempt the paper before opening the key. Model answers show the expected facts and results; mark allocation is a suggested guide and equivalent correct methods should receive credit.

Q1 · 1 mark
No net heat transfer between systems in thermal equilibrium.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q2 · 1 mark
300.15 K, approximately 300 K.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q3 · 1 mark
Heat needed to raise 1 kg by 1 K.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q4 · 1 mark
Q=mcΔT.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q5 · 1 mark
Q=mL.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q6 · 1 mark
Radiation.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q7 · 1 mark
pV=nRT.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q8 · 1 mark
Rate is approximately proportional to excess temperature for small differences.
1 mark for the correct fact, unit or formula. Accept an equivalent correct method.

Q9 · 2 marks
4000 J.
Suggested split: 1 mark for the principle/formula and 1 for the answer or explanation. Accept an equivalent correct method.

Q10 · 2 marks
1.2×10⁻³ m.
Suggested split: 1 mark for the principle/formula and 1 for the answer or explanation. Accept an equivalent correct method.

Q11 · 2 marks
373.15 K.
Suggested split: 1 mark for the principle/formula and 1 for the answer or explanation. Accept an equivalent correct method.

Q12 · 2 marks
400 J/K.
Suggested split: 1 mark for the principle/formula and 1 for the answer or explanation. Accept an equivalent correct method.

Q13 · 2 marks
66,800 J.
Suggested split: 1 mark for the principle/formula and 1 for the answer or explanation. Accept an equivalent correct method.

Q14 · 2 marks
Energy supplies latent heat for phase change.
Suggested split: 1 mark for the principle/formula and 1 for the answer or explanation. Accept an equivalent correct method.

Q15 · 3 marks
21,000 J.
Suggested split: 1 for the relation, 1 for working/reasoning and 1 for result with unit. Accept an equivalent correct method.

Q16 · 3 marks
1.2×10⁻³ m.
Suggested split: 1 for the relation, 1 for working/reasoning and 1 for result with unit. Accept an equivalent correct method.

Q17 · 3 marks
44°C.
Suggested split: 1 for the relation, 1 for working/reasoning and 1 for result with unit. Accept an equivalent correct method.

Q18 · 3 marks
150 kPa.
Suggested split: 1 for the relation, 1 for working/reasoning and 1 for result with unit. Accept an equivalent correct method.

Q19 · 4 marks
Conduction via microscopic interactions; convection by bulk flow; radiation via electromagnetic waves.
Suggested split: 1 for principle, 1 for equation, 1 for working and 1 for result/explanation. Accept an equivalent correct method.

Q20 · 4 marks
mL+mcΔT=83,600 J.
Suggested split: 1 for principle, 1 for equation, 1 for working and 1 for result/explanation. Accept an equivalent correct method.