Science Olympiad Practice Test 1 — NSO-style (Class 8)

Q4. Ravi walks 5 km towards the north, turns right and walks 8 km, turns right again and walks 5 km, and then turns left and walks 4 km. How far is he from his starting point, and in which direction?

Q5. Pointing to a boy, Meena said, "He is the only son of the only son of my paternal grandfather." How is the boy related to Meena?

Q6. In a row of 40 students, Anil is 12th from the left end and Sunil is 25th from the right end. How many students are there between Anil and Sunil?

Q7. Thermometer : Temperature :: Barometer : ?

Q8. How many triangles are there in the figure below?

Q9. A square sheet of paper is folded and punched as shown in the top row: first the top half is folded down onto the bottom half, then the right half is folded over onto the left half, and then one hole is punched. Which figure shows the sheet when it is completely unfolded?

Q10. The reflection of a wall clock in a plane mirror shows the time 3:25. What is the actual time on the clock?

Q11. Which of these crops is a kharif crop, sown at the start of the rainy season (June–July) in India?

Q12. The nitrogen-fixing bacterium Rhizobium lives in the root nodules of

Q13. Which of these human diseases is caused by a protozoan?

Q14. Which of these plastics does NOT soften on heating and so is used to make handles of frying pans?

Q15. An iron nail is kept dipped in blue copper sulphate solution for about an hour. What is observed?

Q16. Sulphur is burnt in a jar and the gas formed is shaken with a little water. The solution formed will

Q17. Which of these non-metals is a good conductor of electricity?

Q18. Which product obtained from refining petroleum is used for surfacing roads?

Q19. The figure shows the three zones of a candle flame. Which zone is the hottest?

Q20. Water should not be used to put out a fire involving petrol because

Q21. Which of these fuels has the highest calorific value?

Q22. A species of plant or animal that is found naturally only in one particular area and nowhere else is called

Q23. Which of these structures is present in a plant cell but NOT in an animal cell?

Q24. In which of these animals does a new individual develop as an outgrowth (bud) from the body of the parent?

Q25. Iodised salt is recommended to prevent goitre because iodine is needed by the thyroid gland to make

Q26. Which blood vessel carries blood that is poor in oxygen from the heart to the lungs?

Q27. Which of these is a way of REDUCING friction?

Q28. The figure shows the waves of two sounds, P and Q, drawn to the same scale over the same time. Compared with sound Q, sound P has

Q29. A bat gives out a sound whose time period is 0.00002 s. What is the frequency of this sound, and can humans hear it?

Q30. Two astronauts standing close together on the Moon cannot hear each other talk directly because

Q31. An iron spoon is to be electroplated with copper. The spoon should be connected to the

Q32. Which of these is the safest place to be during a thunderstorm with lightning?

Q33. A charged rod touches the metal plate of a gold-leaf electroscope and the two leaves move apart. This happens because the leaves

Q34. Two plane mirrors are placed at an angle of 60° to each other with a candle between them. How many images of the candle are formed?

Q35. A ray of light strikes a plane mirror as shown. What is the angle of reflection?

Q36. Which part of the human eye controls the amount of light entering the eye?

Q37. Which gas in vehicle exhaust joins with haemoglobin in the blood and reduces its ability to carry oxygen?

Q38. A yellow turmeric stain on a white cloth is washed with soap. What colour does the stain turn?

Q39. The distance–time graph shows the journeys of three cars, X, Y and Z, which all started at the same time. Which car moved fastest, and at what speed?

Q40. In the human digestive system, the digestion of starch begins in the

Q41. Cuscuta (amarbel) is a yellow, wiry plant with no chlorophyll that takes its food from the stem of the host plant. It is an example of a

Q42. At night near the seashore, a land breeze blows. In which direction does it blow and why?

Q43. Which change will make an electromagnet stronger?

Q44. Which planet has the highest average surface temperature?

Q45. Which of these is a chemical change?

Q46. Four metals W, X, Y and Z were tested in solutions of each other's sulphates:
(i) W in X sulphate: X is deposited.
(ii) Y in W sulphate: no change.
(iii) Z in Y sulphate: Y is deposited.
(iv) Y in X sulphate: X is deposited.
(v) W in Z sulphate: no change.
Which is the correct order of reactivity, from most to least reactive?

Q47. A box weighing 600 N measures 30 cm × 20 cm × 10 cm. It is resting on the floor on its 30 cm × 20 cm face and is then turned so that it rests on its 20 cm × 10 cm face. What happens to the pressure it exerts on the floor?

Q48. A girl stands between two tall cliffs and claps once. She hears the first echo after 2 s and the second echo after 3 s. If the speed of sound in air is 340 m/s, what is the distance between the two cliffs?

Q49. Priya wants to find out whether seeds need light to germinate. She sets up four pots of seeds:
Pot P: watered, kept in light, at 25 °C
Pot Q: watered, kept in the dark, at 25 °C
Pot R: not watered, kept in light, at 25 °C
Pot S: watered, kept in the dark, at 5 °C
Which two pots should she compare?

Q50. In the circuit shown, all three switches K, S1 and S2 are open. Which switches must be closed so that bulbs P and R glow but bulb Q does not?