A heater supplies 150 J of thermal energy to a block of metal. The temperature of the block rises by 30∘C30^\circ\text{C}30∘C.
What happens to the block of metal when its temperature falls by 15∘C15^\circ\text{C}15∘C?
Its internal energy decreases by 75 J75\text{ J}75 J.
Its internal energy decreases by 300 J300\text{ J}300 J.
Its internal energy increases by 75 J75\text{ J}75 J.
Its internal energy increases by 300 J300\text{ J}300 J.
119 exam-style questions on CIE IGCSE Physics 2.2.2a Internal energy and temperature. Each one has a worked solution and a mark scheme showing where the marks go.