Hard SOF National Science Olympiad (NSO/ISO) · NSO Level 1 · . Sample Which of these is a fossil fuel? A Solar energy B Coal C Wind energy D Hydropower Submit Answer Show Explanation Mark as Completed Mark as Important Mark for Review
A gardener cuts a piece of rose stem with a node, plants it in soil and a new rose plant grows from it. This mode of reproduction is called: SOF National Science Olympiad (NSO/ISO) . Easy · Biology · 2026 See Explanation
Fill in the blank: The ozone layer, which protects living things from harmful ultraviolet rays, is found in the ______. SOF National Science Olympiad (NSO/ISO) . Easy · Science · 2026 See Explanation
Which one of the following is a double displacement reaction? SOF National Science Olympiad (NSO/ISO) . Medium · Chemistry · 2026 See Explanation
How many of the following are chemical changes? (i) Burning of paper (ii) Melting of wax (iii) Curdling of milk (iv) Dissolving salt in water SOF National Science Olympiad (NSO/ISO) . Medium · Chemistry · 2026 See Explanation
The table shows four species: W: 6 protons, 6 neutrons X: 7 protons, 7 neutrons Y: 6 protons, 8 neutrons Z: 8 protons, 8 neutrons Which two species are isotopes of the same element? SOF National Science Olympiad (NSO/ISO) . Medium · Chemistry · 2026 See Explanation