NSO Level 1- Science Olympiad (SOF) Class 8: Questions 447 - 450 of 1076
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Question number: 447
Question
Mother gave Meena two small pouches containing iron fillings and coal and asked her to crush both to a fine powder. The result would be
Choices
Choice (4) | Response | |
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a. | She could make a fine powder of both. |
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b. | She could make a fine powder of coal but could not powder iron fillings. |
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c. | She could not make a fine powder of either coal or iron fillings. |
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d. | She could make a fine powder of iron fillings but could not powder coal |
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Question number: 448
» Synthetic Fibres and Plastics
Question
Identify the polymers from its use
It is used to make parachute, ropes for trekking, bristles of tooth brush, seat belts, sleeping bags etc
Choices
Choice (4) | Response | |
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a. | PVC |
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b. | Teflon |
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c. | Nylon |
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d. | Polythene |
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Question number: 449
Question
Sodium and potassium are kept in kerosene. The reason behind this statement is
Choices
Choice (4) | Response | |
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a. | They react vigorously with oxygen and water |
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b. | They generate a lot of heat energy when exposed to air or water |
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c. | Sodium and Potassium are highly reactive metals |
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d. | All a. , b. and c. are correct |
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Question number: 450
» Synthetic Fibres and Plastics
Question
Classify the following into biodegradable and non biodegradable substances
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Paper, 2. Polythene bag, 3. Metals, 4. Wood, 5. Rock, 6. cotton
Choices
Choice (4) | Response | |
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a. | 1,5, 6 – biodegradable and 2,3, 4 – non biodegradable |
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b. | 1,4, 6 – biodegradable and 2,3, 5 – non biodegradable |
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c. | 1,3, 6 – biodegradable and 2,4, 5 – non biodegradable |
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d. | 1,2, 3 – biodegradable and 4,5, 6 – non biodegradable |
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