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.
  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.
  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.
  4. Q174 Name a source of alternating current and a source of direct current.
  5. Q175 Complete and balance the following chemical equation: 2AgBr(s) +sunlight ____
  6. Q176 Name a metal for each case : It does not react with cold as well as hot water but reacts with steam.
  7. Q177 How do we detect the smell of an agarbatti (incense stick) ?
  8. Q178 What is the need for a system of control and coordination in an organism?
  9. Q179 Writethe laws of refraction of light along with the formula.
  10. Q180 Describe fertilization in human female. What happens to the corpus luteum after the successful and unsuccessful fertilization of the ovum?