Lesson T7.2.3
T7.2.3 The light year Quiz: KS3 Physics, Unit 7
20 questions
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Lesson T7.2.3, The light year: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 7: Space physics, written with Revision Ninja.
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The 20 questions
-
What does a light year measure?
- Time
- Speed
- Distance
- Brightness
-
Roughly how far does light travel in one year?
- About 9.5 trillion kilometres
- About 150 million kilometres
- About 300 kilometres
- About 9.5 thousand kilometres
-
What is the approximate speed of light in a vacuum?
- 300 kilometres per second
- 300,000 kilometres per second
- 3,000 kilometres per hour
- 30 kilometres per second
-
Why are light years used instead of kilometres to measure stellar distances?
- Space has no length
- Light speeds up
- Kilometres do not exist
- Distances are huge
-
What is the approximate distance from the Sun to Earth in light minutes?
- 50 light seconds
- 8 light minutes
- 1 light year
- 24 light hours
-
Why is a light year a useful unit for astronomers?
- Matches cosmic scales
- Measures time periods
- Measures temperature
- Calculates star mass
-
Which of these objects is located furthest away from Earth?
- Mars
- Star 4 light years away
- The Moon
- The Sun
-
A star is 10 light years away. How long does its light take to reach Earth?
- 10 minutes
- 10 hours
- 10 years
- 10 seconds
-
Which of these is a unit of time rather than distance?
- Metre
- Kilometre
- Year
- Light year
-
What physical quantity does a light year represent?
- Duration
- Distance
- Acceleration
- Speed
-
What physical quantity does a light year actually measure?
- Distance
- Brightness
- Speed
- Time
-
Light from a star 50 light years away left the star about how long ago?
- About 50 years ago
- About 50 minutes ago
- About 50 days ago
- About 50 seconds ago
-
Why does viewing a distant star show it as it was in the past?
- Stars age backwards
- Light travel time
- Light speeds up
- Time stands still
-
Which of these distances is the largest?
- 10 light years
- 10 light minutes
- 10 light seconds
- 10 light hours
-
Which unit is most appropriate for measuring the distance from Earth to the Moon?
- Kilometres
- Parsecs
- Light years
- Millimetres
-
What is the approximate distance of the nearest star to the Sun, Proxima Centauri, in light years?
- About 4.2 light years
- About 0.42 light years
- About 420 light years
- About 42 light years
-
What physical quantity does a light year measure?
- Distance
- Brightness
- Speed
- Time
-
Why is a light year an unsuitable unit for measuring everyday objects?
- It changes daily
- It is too large
- It requires vacuum
- It measures time
-
What is the distance from Earth to the Sun in kilometres, roughly?
- About 15 kilometres
- About 150 million kilometres
- About 150 thousand kilometres
- About 150 billion kilometres
-
Approximately how many light years away is the Andromeda Galaxy from Earth?
- 4 light years
- 2.5 million
- 500 light years
- 15 billion
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