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Hard general knowledge quiz
Twelve questions where your first instinct is usually wrong.
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General knowledge · 12 questions
Hard science quiz
A challenger round for the science fans. The obvious answer is often the trap.
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Question 1 of 12
Tough question
Which is the only metal that is liquid at a normal room temperature of 20°C?
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- 1. Which is the only metal that is liquid at a normal room temperature of 20°C?
- A. Gallium
- B. Mercury (answer)
- C. Caesium
- D. Bromine
Bromine is also liquid but is not a metal; gallium and caesium melt just above room temperature. - 2. Which is the third most abundant gas in dry air?
- A. Carbon dioxide
- B. Argon (answer)
- C. Neon
- D. Hydrogen
Argon makes up almost 1 percent of the air, over twenty times more than carbon dioxide. - 3. Which organ uses roughly a fifth of the body's energy at rest?
- A. Heart
- B. Liver
- C. Brain (answer)
- D. Lungs
The brain is about 2 percent of body weight but uses around 20 percent of resting energy. - 4. Roughly how long does sunlight take to reach Earth?
- A. 8 seconds
- B. 8 minutes (answer)
- C. 80 minutes
- D. 8 hours
Light covers the 150 million km in about 8 minutes and 20 seconds. - 5. Which is the hottest planet in our solar system?
- A. Mercury
- B. Venus (answer)
- C. Mars
- D. Jupiter
Mercury is closer to the Sun, but Venus's thick carbon dioxide atmosphere traps heat. - 6. Which blood type is known as the universal donor for red blood cells?
- A. A positive
- B. AB positive
- C. O negative (answer)
- D. B negative
O negative red cells lack A, B and RhD antigens, so most people can receive them. - 7. How many bones does a typical adult human skeleton have?
- A. 186
- B. 206 (answer)
- C. 226
- D. 256
Babies are born with around 300, many of which fuse as they grow. - 8. Which planet is the only one not named after a Greek or Roman god?
- A. Earth (answer)
- B. Uranus
- C. Mars
- D. Neptune
Uranus is named after the Greek god of the sky. - 9. Absolute zero is approximately what temperature in Celsius?
- A. -100°C
- B. -173°C
- C. -273°C (answer)
- D. -373°C
Absolute zero is -273.15°C, or 0 kelvin. - 10. Who described the three laws of planetary motion?
- A. Galileo
- B. Copernicus
- C. Johannes Kepler (answer)
- D. Isaac Newton
Kepler published them between 1609 and 1619; Newton later explained why they worked. - 11. Which element makes up most of the Sun's mass?
- A. Helium
- B. Hydrogen (answer)
- C. Oxygen
- D. Carbon
Hydrogen is around three quarters of the Sun's mass, fusing into helium in its core. - 12. Which of these is NOT one of the four bases in DNA?
- A. Adenine
- B. Guanine
- C. Uracil (answer)
- D. Thymine
Uracil replaces thymine in RNA, not DNA.
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