31 A gun pushes back when fired on account of Newton’s

Third Law of Motion

32 The engine having highest efficiency in the group is

Diesel engine

33 The relative humidity at the base of a cloud is closest to

100%

34 Telephone was invented by

Graham Bell

35 We know that a shallow sleep is less restful than a deep sleep. But what kind of sleep we are in, when we dream?

Shallow Sleep

36 How does a honeybee communicate to other bees about the discovery of nectar-giving flowers and pollen which can be converted into honey?

Through various kinds of dances

37 If there were no mulberry trees there would be no

Silk

38 Which is the heaviest flying bird?

Bustard

39 Who invented Safety Match?

Landstrom

40 As a body moves from equator to pole, its weight increases by

½ percent