# Consider the following statements: 1. A recovery ratio of less than 1 implies that the soil has compressed. 2. A recovery ratio of greater than 1 impl

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Consider the following statements:

1. A recovery ratio of less than 1 implies that the soil has compressed.

2. A recovery ratio of greater than 1 implies that the soil has swelled.

3. A recovery ratio of less than 1 implies that the soil has swelled.

4. A recovery ratio of greater than 1 implies that the soil has compressed.

Which of these statements is/are correct?

1. 1 and 2
2. 1 only
3. 3 and 4
4. 4 only

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Correct Answer - Option 1 : 1 and 2

Explanation:

(i) The sample disturbance depends on the design features of a sampler (cutting edge, inside wall friction and non-return valve) and the method of sampling.

(ii) Disturbance can be measure in terms recovery ratio, which is

${L_r} = \frac{{{\mathop{\rm Re}\nolimits} {\mathop{\rm cov}} ered\ length\ of\ sample}}{{penetration\ length\ of\ sample}}$

If, Lr = 1, Good recovery

Lr  > 1, Sample of swelled

Lr < 1, Sample of shrunk or compressed