IGCSE Physics (0625) 6.2.1 The Sun as a star Paper 2 – 2023,2024&2025

Question

Which stages in the life cycle of a star are listed in the order that they occur?

A interstellar dust cloud \(\rightarrow\) stable star \(\rightarrow\) protostar
B protostar \(\rightarrow\) red giant \(\rightarrow\) stable star
C red giant \(\rightarrow\) white dwarf \(\rightarrow\) protostar
D stable star \(\rightarrow\) red giant \(\rightarrow\) white dwarf

▶️Answer/Explanation

Ans: D

Question

A planet orbits the Sun with orbital period \(T\). The average radius of the orbit is \(r\).
What is the average orbital speed of the planet?
A \(2 \pi r T\)
B \(\frac{2 \pi r}{T}\)
C \(\frac{T}{2 \pi r}\)
D \(\frac{\pi r}{2 T}\)

▶️Answer/Explanation

Ans:B

Question

The energy generated in stable stars comes from nuclear reactions.
Which type of reaction occurs in the Sun?

A Helium nuclei break up to give hydrogen nuclei.

B Helium nuclei join together to form hydrogen nuclei.

C Hydrogen nuclei break up to give helium nuclei.

D Hydrogen nuclei join together to form helium nuclei.

▶️Answer/Explanation

Ans:D

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