Science Olympiad Practice Test 1 — NSO-style (Class 3)
A free Maths, Science, English and Reasoning Olympiads (IMO, NSO, IEO style) practice paper for Grade 3 in the format of the real test: 35 questions in 60 minutes, covering Logical Reasoning; Science; Achievers' Section. Logical Reasoning (5 questions) and Science (25 questions) carry 1 mark each. Achievers' Section (5 questions) carries 2 marks each. Total 40 marks. The portal counts each answer once. Choose the best answer and answer every question — there is no penalty for a wrong answer. Attempt it online — every question is marked instantly and the correct answers are shown at the end.
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Q1. What number comes next?
3, 5, 9, 15, 23, ?
Q2. In a secret code, TREE is written as USFF. How is LEAF written in the same code?
Q3. Tara is facing North. She turns right, then turns right again, and then turns left. Which direction is she facing now?
Q4. There are 20 children in a row. Meena is 8th from the left end. What is her position from the right end?
Q5. How many squares are there in this figure?
Q6. Look at the plant. Which labelled part makes food for the plant?
Q7. Which gas do green plants take in from the air to make their food?
Q8. The seeds of which plant are light and hairy, so they are carried away by the wind?
Q9. Which of these plants climbs up a support with the help of thin, curly tendrils?
Q10. Which of these animals lays eggs?
Q11. Which bird has a strong, hooked beak for tearing flesh?
Q12. Which animal can breathe through its moist skin as well as through its lungs?
Q13. How many legs does an insect have?
Q14. Which organ of our body controls all the other parts of the body?
Q15. How many permanent teeth does a grown-up person have in all?
Q16. Which bones protect our heart and lungs?
Q17. Rice, wheat and potatoes are rich in ______, which give us energy.
Q18. Which of these foods do we get from an animal?
Q19. Why does food stay fresh for longer in a refrigerator?
Q20. Wet clothes dry in the sun because the water in them changes into water vapour. What is this change called?
Q21. Tiny drops of water appear on the outside of a glass of ice-cold water. Where do these drops come from?
Q22. Which is the best way to make drinking water safe from germs at home?
Q23. Which of these shows that air takes up space?
Q24. Which instrument is used to measure how hot or cold something is?
Q25. Which of these wastes will rot and mix with the soil?
Q26. The cutting down of a large number of trees in a forest is called ______.
Q27. Cooking pots are made of metal because metals ______.
Q28. Which of these will be pulled by a magnet?
Q29. If a person's clothes catch fire, what should the person do?
Q30. What causes day and night on the Earth?
Q31. Sonu has three pots with the same kind of seedling and the same soil.
Pot P: kept in sunlight and watered daily.
Pot Q: kept in sunlight and not watered.
Pot R: kept in a dark room and watered daily.
Which two pots should Sonu compare to find out whether plants need water?
Q32. The pictures show the shadow of the same pole at four different times on one sunny day. Which picture shows the shadow at 4 o'clock in the afternoon?
Q33. Look at this food chain:
Grass → Grasshopper → Frog → Snake
If all the frogs in a field die, what is most likely to happen first?
Q34. Ravi mixed sand and salt in a glass of water and stirred it. What is the best way to get back the salt?
Q35. Arrange these steps of the water cycle in the correct order.
1. Water vapour cools and forms clouds.
2. The Sun heats water in rivers and seas.
3. Water falls back as rain.
4. Water vapour rises into the air.
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