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Class 8 Olympiad Science Mock Test 5
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Class 8 Olympiad Science Mock Test 5
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25 Questions

1. When an oil well is drilled through rocks, what comes out first?
2. Which of these processes involves the removal of chaff from grain?
3. Sunil gave his clothes to his younger brother Hari when he outgrew. What is this practice known as?
4. To which of the following does the 4R principle apply the most?
5. Which of the following occurs in persons suffering from myopia?
6. Observe the figure given below:

Identify X and Y.
7. The crust of earth is thicker
8. Observe the figure showing a kerosene lamp.

Which of the following is not formed during the combustion of kerosene?
9. Which of the following metals does not produce hydrogen gas when added to acid?
10. Why are LEDs extensively used to replace bulbs?
11. Where does natural gas occur?
12. What makes the live telecast of a cricket match possible?
13. An object placed 4 m from a plane mirror is shifted by 0.5 m away from the mirror. What is the distance between the object and its image?
14. How is Rhizobium useful to farmers?
15. When a man goes to the moon, his
16. In a stethoscope, how does the sound of heart beat travel through the tube?
17. By which of the given processes is coal formed?
18. The diagram given below shows the green house effect.

Which of the following would happen in the absence of greenhouse effect in the atmosphere?
19. Which of the following cell organelles are respectively called suicidal bags and power houses of the cell?
20. In a cinema projector the films in the reel (frames) are made to roll forward at the rate of
21. Which of the following is NOT a feature of potable water?
22. Identify a poor conductor of electricity.
23. Which of the following does NOT cause air pollution?
24. On what factors does the response of the rock to stress depend?
(i) Its temperature
(ii) The speed of stress applied
(iii) The confining pressure on the rock
25. By using which of the following can electrical charge be transferred from a charged object to another?

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