(a) In a reading glass what is the position of the object with respect to the convex lens used?

(b) Why can we not use concave lens for the same purpose?

A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V. Write Yes or No. Give supporting calculations to justify your answer.

How much heat is required to convert 500 g of ice at 0°C to water at 0°C? The latent heat of fusion of ice is 330 J g⁻¹.

Copy and complete the nuclear reaction by filling in the blanks.

$_{92}\text{U}^{235} + _0\text n^1 \longrightarrow _{56}\text {Ba}^{\cdots} + \space _{\cdots}\text {Kr}^{92} + 3 \space _0\text n^1$