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According to significant figure convention the result obtained by adding 12.11, 18.0 and 1.012 is
(a)31.12
(b)31.1
(c)31
(d)31.122

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Important Questions on Units and Measurement
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A physical quantity is described by the relation . If the relative errors in the measurement of , , and respectively, are , , and . Then the relative error in will be:

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S.No. | MS (cm) | VS divisions |
1. | 0.5 | 8 |
2. | 0.5 | 4 |
3. | 0.5 | 6 |
If the zero error is - 0.03 cm, then mean corrected diameter is:

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HARD

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There are two vernier calipers both of which have divided into equal divisions on the main scale. The Vernier scale of one of the calipers has equal divisions that correspond to main scale divisions. The Vernier scale of the other caliper has equal divisions that correspond to main scale divisions. The readings of the two calipers are shown in the figure. The measured values (in ) by calipers and respectively, are

