A star of similar mass to the Sun has a contracting core and expanding outer layers. A student concludes that the whole star must be getting smaller. Which statement corrects the conclusion?
It is becoming a white dwarf; its outer radius increases.
It is becoming a red giant; its outer radius increases.
It is becoming a white dwarf; its outer radius decreases.
It is becoming a red giant; its outer radius decreases.
75 exam-style questions on Edexcel GCSE Physics 7.3 Stars, covering 7.3.1 Evolution of stars similar to the Sun, 7.3.2 Evolution of massive stars, and 7.3.3 Observing the Universe. Each one has a worked solution and a mark scheme showing where the marks go.