Test Index

JAMB Physics 2020 Paper

Question : 17

Total: 38

Solution:

Concept:

A vernier calliper measures length to an accuracy of

0.01\ \text{cm}

, so recordings should have two decimal places.

Explanation:

• Option B:

5.165\ \text{cm}

and Option D:

5.160\ \text{cm}

suggest a smaller least count than a vernier calliper, e.g. a micrometer screw gauge.

• Option C:

5.0\ \text{cm}

is too coarse for vernier calliper accuracy.

• Option A:

5.16\ \text{cm}

is correctly recorded to

0.01\ \text{cm}

Answer:

5.16\ \text{cm}

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