NSO Level 1- Science Olympiad (SOF) Class 8: Questions 747 - 750 of 1076
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Question number: 747
» Friction
Question
In a school building there are four ways with equal length to reach the main gate. First is the main path paved with polished lock tiles, second is a concrete path, third is paved with sand, and the fourth one is paved with gravel which is used for four wheelers. Rahul has a sprain on his right leg and doctor advised him not to give much strain to that leg. Which of the paths should he select?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | First |
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| b. | Third |
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| c. | Fourth |
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| d. | Second |
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Question number: 748
» Friction
Question
The lower part of the soul of footwear is not smooth and plane. They are grooved to make the surface rough
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Rough surface gives enough grip while moving |
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| b. | This helps to increase the friction |
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| c. | Both a. and b. are correct |
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| d. | None of the above |
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Question number: 749
Question
We are able to drink juice from a narrow necked bottle with the help of a straw. This is because of
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Air pressure |
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| b. | Water pressure |
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| c. | Muscular force |
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| d. | All of the above |
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Question number: 750
» Friction
Question
When a worker uses a rolling grindstone to sharpen the knife, sparks are produced. This is because
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Light energy is produced due to friction |
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| b. | Heat energy produced due to friction changes to light energy |
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| c. | The edge of the knife starts burning by heat |
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| d. | None of the above |
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