Science Full Practice Exam – Set 3 (Class 4)

What this worksheet covers

This is a 35-question practice worksheet on full practice exam — set 3 for Class 4, written to the pattern of the SOF National Science Olympiad (NSO). It carries 40 marks and is designed to be attempted in 60 minutes, split across three sections — Section 1 — Logical Reasoning, Section 2 — Science 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 4 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
• Achievers Section questions in the olympiad format
• Reading worked solutions to find the step that went wrong

How to use it

1. 1There are 35 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 1–30 carry 1 mark each. Questions 31–35 (Achievers Section) carry 2 marks each.
4. 4There is no negative marking. Use of a calculator is not allowed.
5. 5Study every diagram carefully. Rough work may be done at the side of each page.

Sample questions from this worksheet

A preview of what's inside Science Full Practice Exam – Set 3 (Class 4) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. The numbers in this pattern double each time. What comes next? 5, 10, 20, 40, ____

   • A80correct
   • B85
   • C90
   • D95
   Solution: Each number in the pattern is twice the one before it: 5, 10, 20, 40. Doubling 40 gives 40 × 2 = 80.

2. 2. Besides sunlight and water, which gas does a leaf take in from the air to make its own food?

   • AOxygen
   • BCarbon dioxidecorrect
   • CNitrogen
   • DHydrogen
   Solution: A leaf uses sunlight energy to combine water from the soil with carbon dioxide taken in from the air, making food for the plant and releasing oxygen as a by-product.

3. 3. Consider the following statements.(i) The lungs take in oxygen from the air and release carbon dioxide out of the body.(ii) A magnet attracts objects made of iron and steel.(iii) All liquids evaporate at exactly the same speed.Which of the statements is/are correct?

   • A(i) and (ii) onlycorrect
   • B(ii) and (iii) only
   • C(i) and (iii) only
   • DAll three
   Solution: Statement (i) is true; breathing in oxygen and breathing out carbon dioxide is the main job of the lungs. Statement (ii) is true; magnets pull on iron and steel objects but not on materials such as wood or plastic. Statement (iii) is false — different liquids evaporate at different speeds; for example, petrol evaporates much faster than water. Hence (i) and (ii) are correct.