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JAMB Physics 2016 Paper

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Question : 45

Total: 48

From the diagram above, the measuring accuracy of the micrometer screw gauge is

4.78mm
4.16mm
4.66mm
4.70mm

Solution:

Concept:

For a micrometer screw gauge: reading

=

main scale reading

+

(thimble scale reading

\times

least count).

Explanation:

From the diagram, the main scale reading is

4.50\ \mathrm{mm}

.

The thimble scale coincides at

16

divisions.

Least count of the micrometer is

0.01\ \mathrm{mm}

.

So,

4.50\ \mathrm{mm} + (16 \times 0.01\ \mathrm{mm}) = 4.50\ \mathrm{mm} + 0.16\ \mathrm{mm} = 4.66\ \mathrm{mm}

Answer:

C. 4.66mm

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