(i) (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?

(ii) 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.

(iii) State two factors affecting the speed of rotation of the coil in a D.C. motor.

(iv) 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 Jg^-1.

(v) Copy and complete the nuclear reaction by filling in the blanks.

Solution

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