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Mark Scheme & Answer Key
Notice for Students & Teachers: > Looking for the student mock exam paper to go with this
answer key? Search for "Energy Resources and Heat Transfer Stage 8 Mock Examination" on
💡
my storefront!
Special Bundle Offer: You can get this official answer key together with the matching student
mock exam paper at a 30% discount in a special bundle! Additionally, detailed revision notes,
solved notebook classwork, and an exam cheat sheet for this exact chapter are all available on
my storefront to complete your ultimate study package.
Coming Soon: Stay tuned! On November 8th at 2:00 PM PKT / 9:00 AM UTC, I will be
uploading the exact exam topics' checklist that appeared in the Grade 8 midterm exams for
all 8 core subjects of the Cambridge Lower Secondary curriculum, including Mathematics,
Science, English, History, Geography, Urdu, and Islamiat (Islamic Studies).
SECTION A: Multiple Choice & Short Questions [12 Marks]
Which energy....................or turbine?
1. A. Solar thermal heater
2. B. Solar PV cell
● Marking Guidance [1 Mark]: * Award 1 mark for option B.
○ If a student writes "Photovoltaic panel" or "PV cell" instead of the letter, award full
credit. If they select A or C, award 0 marks (these produce heat, not direct
electricity via PV effect).
Heat transfer....................neighboring particles
1. A. Convection currents rising
2. C. Particles vibrating and colliding with neighboring particles
● Marking Guidance [1 Mark]: * Award 1 mark for option C.
○ If the student writes "Conduction", accept for 1 mark as it describes the same
mechanism. If they mention free electrons only, do not award marks unless C is
chosen, as vibrating/colliding is the fundamental requirement for all solids.
Which of....................energy source?
1. A. Biomass
2. C. Nuclear energy
● Marking Guidance [1 Mark]: * Award 1 mark for option C.
○ Students frequently confuse nuclear energy with renewables because it does not
emit CO2. If a student selects C, give full marks. If they choose A (Biomass), remind
them that trees/crops can be replanted, making them renewable.
Dull black....................thermal radiation
1. A. Good absorbers and poor emitters of thermal radiation
2. C. Good absorbers and good emitters of thermal radiation
● Marking Guidance [1 Mark]: * Award 1 mark for option C.
○ Dull black is the best absorber AND best emitter. If the student selects A or B
(mixing up absorption and emission properties), award 0 marks.
Complete the....................or not at all:
● Marking Guidance [4 Marks]:
📢
Mark Scheme & Answer Key
Notice for Students & Teachers: > Looking for the student mock exam paper to go with this
answer key? Search for "Energy Resources and Heat Transfer Stage 8 Mock Examination" on
💡
my storefront!
Special Bundle Offer: You can get this official answer key together with the matching student
mock exam paper at a 30% discount in a special bundle! Additionally, detailed revision notes,
solved notebook classwork, and an exam cheat sheet for this exact chapter are all available on
my storefront to complete your ultimate study package.
Coming Soon: Stay tuned! On November 8th at 2:00 PM PKT / 9:00 AM UTC, I will be
uploading the exact exam topics' checklist that appeared in the Grade 8 midterm exams for
all 8 core subjects of the Cambridge Lower Secondary curriculum, including Mathematics,
Science, English, History, Geography, Urdu, and Islamiat (Islamic Studies).
SECTION A: Multiple Choice & Short Questions [12 Marks]
Which energy....................or turbine?
1. A. Solar thermal heater
2. B. Solar PV cell
● Marking Guidance [1 Mark]: * Award 1 mark for option B.
○ If a student writes "Photovoltaic panel" or "PV cell" instead of the letter, award full
credit. If they select A or C, award 0 marks (these produce heat, not direct
electricity via PV effect).
Heat transfer....................neighboring particles
1. A. Convection currents rising
2. C. Particles vibrating and colliding with neighboring particles
● Marking Guidance [1 Mark]: * Award 1 mark for option C.
○ If the student writes "Conduction", accept for 1 mark as it describes the same
mechanism. If they mention free electrons only, do not award marks unless C is
chosen, as vibrating/colliding is the fundamental requirement for all solids.
Which of....................energy source?
1. A. Biomass
2. C. Nuclear energy
● Marking Guidance [1 Mark]: * Award 1 mark for option C.
○ Students frequently confuse nuclear energy with renewables because it does not
emit CO2. If a student selects C, give full marks. If they choose A (Biomass), remind
them that trees/crops can be replanted, making them renewable.
Dull black....................thermal radiation
1. A. Good absorbers and poor emitters of thermal radiation
2. C. Good absorbers and good emitters of thermal radiation
● Marking Guidance [1 Mark]: * Award 1 mark for option C.
○ Dull black is the best absorber AND best emitter. If the student selects A or B
(mixing up absorption and emission properties), award 0 marks.
Complete the....................or not at all:
● Marking Guidance [4 Marks]:
