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How sensitivity of spirit level is expressed?

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How sensitivity of spirit level is expressed?

(a) Angle in seconds/1 division of tube

(b) Angle in minutes/2 divisions of tube

(c) Angle in minutes/1 division of tube

(d) Angle in seconds/2 divisions of tube

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Enquiry is from Spirit Level in section Linear Measurements of Engineering Metrology

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Right answer is (a) Angle in seconds/1 division of tube

For explanation: Sensitivity of a spirit level is the angle of tilt in seconds to the 1 division of tube i.e. bubble will move by 1 division of the tube. One division = about 2.5 mm.

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