Question

which of these is not a standard unit (a)second (b) metre (c) hand span (d) gram​

Answer 1

Answer:

Second

Explanation:

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Answer 2

Hand span

Explanation:

Hand span is not a standard unit.

Second is the unit of time.

Meter is the unit of length or distance covered by an object.

Gram is the unit of weight of an object.

Hand span is not a standard unit. This is because the size of hand varies from person to person. Hence, the correct option is (c) "hand span".

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Standard unit

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