Question 1:

The method that works really well in metals is:

Conduction

• Metals have free electrons that can transfer thermal energy quickly through the material, making them excellent conductors of heat.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

The method that works by hot regions rising in liquids and gases is:

Convection

• When a fluid (liquid or gas) is heated, it expands, becomes less dense, and rises. Cooler, denser fluid sinks to take its place, creating a convection current. This cycle transfers heat through the fluid.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3-5:

Here is the completed passage:

Heat radiation can travel through empty space, known as a(n) vacuum.
Silver coloured objects will not absorb heat radiation easily.
(Note: White objects also reflect heat away, but silver is better, so the best choice here).
If you want an object to cool down quickly by losing heat radiation, it should be coloured black (or dark).

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

• The heater at the bottom left warms the air nearby.

• Warm air becomes less dense and rises along the left side of the room.

• The cold window at the top right cools the air near it.

• Cool air becomes more dense and sinks along the right side of the room.

• This creates a convection current:

  • Warm air rises on the left → moves across the ceiling to the right → cools and sinks on the right → moves across the floor back to the left → repeats.

  This movement is clockwise.

Answer: C. rotate clockwise

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

The correct answer is:

D. a convection current

• This is the term for the circular movement of a fluid (liquid or gas) caused by differences in temperature and density — exactly as described with the heater and window.

Answer: D. a convection current

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

The correct answer is:

A. Because they are less dense than the surroundings.

• When a liquid or gas is heated, its particles gain energy and spread apart, making it less dense.

• The cooler, denser surroundings push the less dense, hotter fluid upward due to buoyancy.

Answer: A

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

The correct answer is:

A. To prevent heat loss by conduction

• Trapping air in materials like polystyrene foam reduces heat loss by conduction, because air is a poor conductor of heat.

• The trapped air also limits convection currents inside the material, but the primary reason for using foam-like materials is to reduce conduction.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

The correct answer is:

B. To prevent heat loss by convection

• A lid with only a small gap traps warm air above the hot liquid.

• This prevents large-scale convection currents from carrying heat away from the surface of the liquid.

• Without a lid (or with a large opening), warm air would rise and escape, pulling cooler air in to repeat the cycle.

Answer: B

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.