Q5 of 33 Page 1

Why is there a need to harness non-conventional sources of energy? Give two main reasons.

We need to harness non-conventional sources of energy as fossil fuels which are conventional sources are limited and might get exhausted due to their overuse, burning of fossil fuels cause pollution.


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3

An element “X” has mass number 35 and the number of neutrons is 18. Identify the group number and period of “X”.

 4

An object of height 1.2m is placed before a concave mirror of focal length 20cm so that a real image is formed at a distance of 60cm from it. Find the position of an object. What will be the height of the image formed?

 6

Name the electric device that converts mechanical energy into electrical energy. Draw the labelled diagram and explain the principle involved in this device.

 6

(i) What is the function of earth wire in electrical instruments?

(ii) Explain what is short-circuiting an electric supply.


(iii) What is the usual current rating of the fuse wire in the line to feed (a) Lights and fans? (b) Appliances of 2kW or more power?