IGCSE · 6 · multiple choice
Space physics · Question 4
Space physics · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- recall
- Marks
- 1
- Topics
- 1
- Answer
- Complete
multiple choice1 mark
What is a light-year?
- A
the time taken for light to travel across the Milky Way
- B
the distance travelled by light in one year
- C
the time taken for light from the Sun to reach the Earth
- D
the age of the light emitted by a distant galaxy
Ready to self-mark?Reveal the detailed answer guide
Answer overviewCorrect answer: B — the distance travelled by light in one year
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is B: the distance travelled by light in one year
- 2
A, C and D are all times. The name misleads, which is why this item appears on real papers so often: a light-year is a distance.
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