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Question

If a 100g sample of soil absorbs 20mL of water, the percentage of moisture absorption is ___%.

A
15
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B
30
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C
20
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D
40
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Solution

The correct option is C 20

The percentage of water absorption is given by:

Percentage of water absorption = Weight of water absorbed in gramsWeight of soil in grams×100

It is given that the weight of soil taken is 100g. Also the volume of water absorbed is 20mL. But to find the percentage, we need the weight of water.

1mL of water weighs 1g. So, 20mL of water weighs 20g.

Percentage of water absorption = 20g100g×100 = 20%


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