Science Full Practice Exam – Set 3 (Class 8)

What this worksheet covers

This is a 50-question practice worksheet on full practice exam — set 3 for Class 8, written to the pattern of the SOF National Science Olympiad (NSO). It carries 60 marks and is designed to be attempted in 60 minutes, split across four sections — Section 1 — Logical Reasoning, Section 2 — Science, Section 2 — Science (contd.) and Achievers Section. Every question is multiple choice with exactly one correct option, and every one comes with a fully worked solution rather than just an answer key — so a child who gets one wrong can see where the reasoning went astray instead of only learning that it did.

Skills your child practises

• Applied problem-solving on full practice exam — set 3 at Class 8 level
• Working accurately against a time limit, as the real paper demands
• Section 1 — Logical Reasoning questions in the olympiad format
• Section 2 — Science questions in the olympiad format
• Section 2 — Science (contd.) questions in the olympiad format
• Achievers Section questions in the olympiad format
• Reading worked solutions to find the step that went wrong

How to use it

1. 1There are 50 questions in this paper. All questions are compulsory.
2. 2Each question has four options (A), (B), (C) and (D). Exactly one option is correct.
3. 3Questions 1–45 carry 1 mark each. Questions 46–50 (Achievers Section) carry 3 marks each.
4. 4There is no negative marking. Study every diagram and table carefully.

Sample questions from this worksheet

A preview of what's inside Science Full Practice Exam – Set 3 (Class 8) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. What comes next in the series? 5, 11, 23, 47, ____

   • A90
   • B93
   • C95correct
   • D99
   Solution: Each number is doubled and then increased by 1: 5×2+1=11, 11×2+1=23, 23×2+1=47, 47×2+1=95.

2. 2. Sugarcane, cotton and maize need warm, wet conditions and are sown with the onset of the monsoon. They are examples of _______ crops.

   • AKharifcorrect
   • BRabi
   • CPerennial
   • DZaid
   Solution: Kharif crops are sown at the start of the rainy season and need warm, wet conditions.

3. 3. Why do farmers often grow a cereal crop like wheat and a leguminous crop like gram in rotation, season after season?

   • ALeguminous crops need no water at all
   • BLeguminous roots host nitrogen-fixing bacteria that replenish soil nitrogen used up by the cereal cropcorrect
   • CRotation always makes the soil more acidic
   • DCereal crops permanently destroy soil fungi
   Solution: Root nodules of leguminous plants host nitrogen-fixing bacteria that replenish the soil's nitrogen, which cereal crops like wheat draw down, so alternating the two keeps the soil fertile.