Previous Year Questions

Practice Questions

Browse and practice real questions from previous scholarship exams. Use filters to narrow down by year, subject, or exam.

Displaying 531 - 535 of 1956
Easy
. SOF National Science Olympiad (NSO/ISO) · Set B · 2026 . Sample
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Q. 375
An atom of Potassium has atomic number 19 and mass number 39. How many neutrons does it contain?
Medium
. SOF National Science Olympiad (NSO/ISO) · Set A · 2026 . Sample
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Q. 376
When solutions of sodium sulphate and barium chloride are mixed, a white precipitate of barium sulphate forms. What type of reaction is this?
Medium
. SOF National Science Olympiad (NSO/ISO) · Set D · 2026 . Sample
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Q. 377
When zinc granules are added to a copper sulphate solution, the blue colour fades and copper is deposited. What type of reaction is this?
Hard
. SOF National Science Olympiad (NSO/ISO) · Set C · 2025 . Sample
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Q. 378
Balance the equation: __Fe + __O2 → __Fe2O3
Easy
. SOF National Science Olympiad (NSO/ISO) · Set C · 2026 . Sample
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Q. 379
The chemical process by which iron develops a reddish-brown coating when exposed to moist air over time is called what?