IMPORTANT QUESTIONS

1. Q171 Two lamps one rated 100 W 220 V, and the other 60 W 220 V, are connected in parallel to electric mains supply. Find the currents drawn by two bulbs from the line, if the supply voltage is 220 V.

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2. Q172 In below questions, (A) is Assertion and (R) is Reason then choose the appropriate answers: Assertion (A): Magnetic field lines never intersect. Reason (R): At a particular point magnetic field has only one direction.

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3. Q173 State reasons for the following: Stain of curry on a white cloth becomes reddish brown when soap is scrubbed on it and turns yellow again when the cloth is washed with plenty of water.

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4. Q174 Name a source of alternating current and a source of direct current.

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5. Q175 Complete and balance the following chemical equation: 2AgBr(s) +sunlight ____

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6. Q176 Name a metal for each case : It does not react with cold as well as hot water but reacts with steam.

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7. Q177 How do we detect the smell of an agarbatti (incense stick) ?

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8. Q178 What is the need for a system of control and coordination in an organism?

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9. Q179 Writethe laws of refraction of light along with the formula.

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10. Q180 Describe fertilization in human female. What happens to the corpus luteum after the successful and unsuccessful fertilization of the ovum?

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