26. A body weighs 250 N on the surface of the earth. How much will it weigh half way down to the centre of the earth ?      (1) 125 N              (2) 200 N      (3) 250 N              (4) 100 N 27. Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance.   The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from     section B are glowing, will be :       (1) 4 : 9                 (2) 9 : 4       (3) 1 : 2                 (4) 2 : 1 28. For a p...