Q. 1. What is the shape of V-I graph for an ohmic resistance?
Q. 2. Why does a compass needle get deflected when brought near a bar magnet?
Q. 3. The image formed by a convex lens is always real. Is it true?
Q. 4. A concave mirror produces two times magnified real image of an object placed at 10 cm infront of it. Where is the image located?
Q. 5. Name two energy sources that you would consider to be renewable. Give reasons for your choices.
Q. 6. Will current flow more easily through a thick wire or thin wire of the same material when connected to the same source? Why?
Q. 7. Name two safety measures commonly used in electrical circuits and appliances. An electric oven of a 2 kw power rating is operated in a domestic circuit (220V) that has a current rating of 5 A. What result do you expect? Explain.
Q. 8. Show how will you connect three resistors, each of resistance 6 ohm, so that the combination has a resistance of (i) 9 ohm (ii) 2 ohm. Justify your answer.
Q. 9. What is myopia? List two causes for the development of myopia. Describe with ray diagrams, how this defect may be corrected by using spectacles.
