Sunday, September 13, 2026
These are the 10 questions BrainRank served to the whole world on Sunday, September 13, 2026 — now over, with every answer revealed and explained. Reading time only; the score no longer counts.
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science
What is the name of Earth's only natural satellite?
- Titan
- Europa
- Phobos
- The Moon
Answer: The Moon
The Moon is Earth's single natural satellite.
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arts
Which of these instruments is a member of the woodwind family?
- Trumpet
- Clarinet
- Timpani
- Violin
Answer: Clarinet
The clarinet is a woodwind instrument; trumpet is brass, timpani percussion, violin strings.
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everyday-science
Mixing baking soda with vinegar produces bubbles of which gas?
- Oxygen
- Carbon dioxide
- Hydrogen
- Nitrogen
Answer: Carbon dioxide
The reaction of baking soda and vinegar releases carbon dioxide gas.
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language
Which word is the closest synonym of 'rapid'?
- Sluggish
- Steady
- Swift
- Weary
Answer: Swift
'Swift' means fast, matching 'rapid'.
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mythology
In Greek mythology, which hero was famously set twelve labours?
- Theseus
- Odysseus
- Perseus
- Heracles
Answer: Heracles
Heracles (Hercules to the Romans) performed the Twelve Labours as penance.
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math
How many sides does a pentagon have?
- 4
- 6
- 7
- 5
Answer: 5
A pentagon has 5 sides.
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everyday-science
Through which type of material does sound generally travel fastest?
- A solid
- A gas
- A vacuum
- Empty space
Answer: A solid
Sound travels faster through solids than through liquids or gases because particles are more tightly packed.
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language
Which word is the best antonym of 'expand'?
- Contract
- Enlarge
- Stretch
- Widen
Answer: Contract
'Contract' (shrink) is the opposite of 'expand'; the others mean grow larger.
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language
What is the traditional collective noun for a group of lions?
- Herd
- Pride
- Pack
- School
Answer: Pride
A group of lions is called a 'pride'.
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math
What is 100 − 37?
- 67
- 73
- 53
- 63
Answer: 63
100 − 37 = 63.