45. hair drier has an efficiency of ________

44. steam turbine has _________ % efficiency

42. the efficiency of automobile is only around ___________

25. fertilization in platyhelminthes is always

41. when a force retards the motion of a body. the work done is :

39. Two bodies A and B having masses 3Kg and 4 kg are raised to the same height from the earth’s surface. The ratio of the gravitational potential of A to that of B

36. The parachutist is falling constant terminal velocity which statement is not correct.

35. Which of the following has the largest kinetic energy ?

34. An a object of mass 1 g is whirled in a horizontal circle of radius 0.5m at a constant speed of 12m/s. The work done on the object during one revolution is :

33. A man carries a 1 Kg body 10m horizontally on a level ground. The work done by the man is,