41 What is the element which has the greatest number of compounds?

Carbon

42 Hansen’s disease is

Leprosy

43 Vacuum is created in an electric bulb so that

The filament is not burnt up in the presence of air oxygen

44 The mass of an atom resides in the

Nucleus

45 Rest and Motion are

Relative terms

46 A pathological excess of white corpuscles in the blood is called

Leukaemia

47 A vitamin that affects the ability to see in the dim light is

Vitamin A

48 A man is ordering a lens to use as a reading glass. He should order

A large convex lens with short focal length

49 Newton’s Disk, when rotated rapidly appears

White

50 The four chamber heart is found in

Birds and Mammals