Friday, September 11, 2026

These are the 10 questions BrainRank served to the whole world on Friday, September 11, 2026 — now over, with every answer revealed and explained. Reading time only; the score no longer counts.

1. mythology

   In Greek mythology, who is the king of the gods and ruler of Mount Olympus?

   • Hades
   • Apollo
   • Zeus
   • Hermes

   Answer: Zeus

   Zeus rules the Greek pantheon from Mount Olympus; Hades rules the underworld instead.

2. math

   What is 7 × 9?

   • 56
   • 72
   • 63
   • 54

   Answer: 63

   7 × 9 = 63.

3. science

   Which unit is used to measure frequency, such as cycles per second?

   • Newton
   • Hertz
   • Joule
   • Kelvin

   Answer: Hertz

   The hertz (Hz) is the SI unit of frequency, equal to one cycle per second.

4. math

   What is 8 squared?

   • 16
   • 48
   • 64
   • 56

   Answer: 64

   8² = 8 × 8 = 64.

5. geography

   Which city serves as the capital of Australia?

   • Sydney
   • Canberra
   • Melbourne
   • Brisbane

   Answer: Canberra

   Canberra is the capital of Australia (not Sydney or Melbourne).

6. nature

   What is the process by which caterpillars change into butterflies, and tadpoles into frogs, called?

   • Photosynthesis
   • Metamorphosis
   • Hibernation
   • Pollination

   Answer: Metamorphosis

   Metamorphosis is the transformation an animal undergoes as it develops into an adult.

7. history

   Stonehenge, a prehistoric monument of standing stones, is located in which country?

   • England
   • Ireland
   • France
   • Germany

   Answer: England

   Stonehenge is a prehistoric stone monument located in Wiltshire, England.

8. science

   Which planet is best known for its prominent system of rings?

   • Mars
   • Venus
   • Saturn
   • Mercury

   Answer: Saturn

   Saturn is famous for its large, bright ring system.

9. everyday-science

   Why does ice float on top of liquid water?

   • It is warmer than the water
   • It traps air pockets on purpose
   • Water pushes all solids up
   • It is less dense than liquid water

   Answer: It is less dense than liquid water

   Water expands when it freezes, making ice less dense than liquid water so it floats.

10. everyday-science

    Which type of energy does a moving object possess?

    • Potential energy
    • Chemical energy
    • Kinetic energy
    • Nuclear energy

    Answer: Kinetic energy

    Kinetic energy is the energy of motion.