Which of the following is not a commonly used tool for measuring length?

Micrometer

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Calipers

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Ruler

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(a) and (b) above.

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Solution

The correct option is D (a) and (b) above.
Calipers:

Micrometer:

Calipers and Micrometer are not commonaly used tools for measuring lengths.

Ruler:

Ruler is a commonaly used tool for measuring lengths.

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