51.The metal which can join well with the glass is

52.If rubber tyres replace wheels in bullock carts then 1. speed of bullock cart increases. 2. load carrying capacity increases. 3. the capacity of bullock to pull the cart at a streatch increases.

53.A glass tumbler containing ice shows drolets of water on the outer surface because

54.A material that allows partial transmission of incient light is called

55.Burns caused by steam are much more severe than those caused by boiling water as