The least count of a 200 mm long spirit level is given

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The least count of a 200 mm long spirit level is given as 10 sec per division. The gradient of the spirit level expressed as mm over one meter is

1. 0.048mm
2. 1.048mm
3. - 1.048mm
4. 0.48mm

Correct Option: A

Gradient of spirit level

=		10	×	π	× 1000 = 0.048 mm
		60 × 60		180