| 1. | The layers such as sand and gravel which allow the water to pass through them are known as ? | |
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previous layers
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aquifers
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water bearing strata
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all of these
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Report Question| 2. | The colour of water is expressed in numbers of a ? | |
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silica scale
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platinum cobalt scale
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po value
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none of these
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| 3. | The formula, F = R - K(1.8T + 32) for obtaining the annual run-off is known as ? | |
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Justin's formula
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Vermule's formula
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Inglis formula
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Khosla's formula
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| 4. | Which of the following belongs to homologous series of alkynes C6H6, C2H6, C2H4, C3H4 ? | |
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C2H6
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C2H4
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C3H4
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C6H6
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