Units & Measurement and Dimensions

You measure two quantities as $ A=1.0 \mathrm{~m} \pm 0.2 \mathrm{~m} $, $ B=2.0 . \mathrm{m} \pm 0.2 \mathrm{~m} $. We should report correct value for $ \sqrt{A B} $ as

If nth division of main scale coincides with (n + 1)th division of vernier scale. The least count of the vernier is (Given, one main scale division is equal to a units)

If L, R, C and V represent inductance, resistance, capacitance and potential difference respectively, then dimensions of \({L \over {RCV}}\) are the same as those of

The length of the rectangle is l = 15.2 cm and breadth is b = 2.9 cm and the minimum possible measurement by scale = 0.1 cm. Then, the area of the rectangle is (Taking significant figures into consideration)