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 | |
|---|---|---|
| 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 | |
|---|---|---|
| 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 | |
|---|---|---|
| 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 | |
|---|---|---|
| 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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