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WAEC Physics 2022 Paper

Question : 48

Total: 50

Solution:

Concept:

A vernier caliper measures length accurately to a least count of

0.01\ \text{cm}

Explanation:

The correct reading must show two decimal places in centimetres to include the vernier scale.

Option A,

4.1\ \text{cm}

, has only one decimal place, so it is not precise enough.

Option B,

4.13\ \text{cm}

, gives a valid vernier caliper reading.

A typical vernier caliper has a range of about

30.0\ \text{cm}

, so

125\ \text{cm}

and

1254\ \text{cm}

are not suitable.

Answer:

4.13\ \text{cm}

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