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 521 - 525 of 1956
Medium
. SOF National Science Olympiad (NSO/ISO) · Set C · 2025 . Sample
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Q. 365
A neutral atom of Fluorine has atomic number 9. How many electrons does it contain?
Medium
. SOF National Science Olympiad (NSO/ISO) · Set D · 2025 . Sample
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Q. 366
An atom of Potassium has atomic number 19 and mass number 39. How many protons does it contain?
Hard
. SOF National Science Olympiad (NSO/ISO) · Set A · 2024 . Sample
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Q. 367
An atom of Nitrogen has atomic number 7 and mass number 14. How many neutrons does it contain?
Easy
. SOF National Science Olympiad (NSO/ISO) · Set D · 2024 . Sample
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Q. 368
A neutral atom of Sulphur has atomic number 16. How many electrons does it contain?
Medium
. SOF National Science Olympiad (NSO/ISO) · Set C · 2026 . Sample
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Q. 369
An atom of Carbon has atomic number 6 and mass number 12. How many protons does it contain?