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Q.

In a vernier callipers, smallest division on the main scale is 1mm, while the vernierscale have 20 divisions. When fixed jaw touches the movable jaw, zero of vernier scale lies on the right of the zero of the main scale and 15th division of vernier scale coincides with any division of main scale. What is the type of zero error and its value ?

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a

positive, 0.75 mm

b

positive, 0.15 mm

c

negative, 0.75 mm

d

negative, 0.15 mm

answer is A.

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Detailed Solution

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LC=120=0.05cm

Zero error=0.05×15=0.75

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In a vernier callipers, smallest division on the main scale is 1mm, while the vernierscale have 20 divisions. When fixed jaw touches the movable jaw, zero of vernier scale lies on the right of the zero of the main scale and 15th division of vernier scale coincides with any division of main scale. What is the type of zero error and its value ?