10 reviewed questions · hard difficulty

Hard General Knowledge Questions

This set is for players who want fewer instant answers. The subjects range from SI units and astronomy to treaties, language families, and classic literature.

By QZify Editorial Team · Published 2026-08-19 · Reviewed 2026-08-19

Questions with a sharper edge

The wording avoids deliberate traps, but the facts are less commonly recalled. Use the explanations to turn missed answers into useful knowledge.

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Questions and answers

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Sciencehard
1. What is the SI unit of electrical capacitance?
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Answer: The farad
The farad, symbol F, is named after Michael Faraday.
Source: BIPM SI Brochure
Historyhard
2. Which 1648 settlement is associated with ending the Thirty Years' War?
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Answer: The Peace of Westphalia
The term refers to treaties signed at Münster and Osnabrück in 1648.
Source: Encyclopaedia Britannica
Geographyhard
3. What is the deepest known ocean trench?
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Answer: The Mariana Trench
Its Challenger Deep is the deepest measured part of the world's oceans.
Source: NOAA
Sciencehard
4. Approximately how many entities are in one mole?
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Answer: 6.022 × 10^23
This value is the Avogadro constant expressed per mole.
Source: BIPM SI Brochure
Languagehard
5. To which language family does Hungarian belong?
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Answer: The Uralic language family
Hungarian is related distantly to Finnish and Estonian rather than to neighbouring Indo-European languages.
Source: Encyclopaedia Britannica
Historyhard
6. Which 1494 treaty divided newly encountered lands outside Europe between Spain and Portugal?
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Answer: The Treaty of Tordesillas
The agreement set a north–south line west of the Cape Verde islands.
Source: Encyclopaedia Britannica
Spacehard
7. What is the largest moon in the Solar System?
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Answer: Ganymede
Jupiter's moon Ganymede is larger than the planet Mercury.
Source: NASA Science
Literaturehard
8. In which classical language was the Mahabharata composed?
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Answer: Sanskrit
The epic was composed and transmitted in Sanskrit over a long period.
Source: Encyclopaedia Britannica
Sciencehard
9. Which element has atomic number 74?
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Answer: Tungsten
Tungsten has the symbol W, derived from its older name wolfram.
Source: Encyclopaedia Britannica
Literaturehard
10. Who wrote The Master and Margarita?
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Answer: Mikhail Bulgakov
Bulgakov wrote the novel in the Soviet Union, and it was published posthumously.
Source: Encyclopaedia Britannica