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WAEC Physics 2017 Paper

Question : 1

Total: 50

The diagram above is a micrometer screw gauge. Determine its reading.

2.44mm
2.46mm
2.86mm
2.96mm

Validate

Solution:

Concept:

Micrometer screw gauge reading is obtained by adding the main scale reading to the product of the thimble scale division and the least count, which is

0.01\ \text{mm}

Explanation:

From the diagram, the main scale reading is

2.0\ \text{mm}

The thimble scale aligns at

46

divisions.

Thimble contribution

= 46 \times 0.01\ \text{mm} = 0.46\ \text{mm}

Total reading

= 2.0\ \text{mm} + 0.46\ \text{mm} = 2.46\ \text{mm}

Answer:

2.46\ \text{mm}

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