The lever should be turned gently, in order to :

ensure that the motion is smooth and quiet

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prevent the knife edges from chipping

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avoid any jerk on the balance

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none of these

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Solution

The correct option is B prevent the knife edges from chipping
The lever should be turned gently in order to prevent the knife edges from chipping.

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The lever should be turned gently, in order to :

The correct option is B prevent the knife edges from chippingThe lever should be turned gently in order to prevent the knife edges from chipping.

The correct option is B prevent the knife edges from chipping
The lever should be turned gently in order to prevent the knife edges from chipping.