Speed downstream = 60/12 = 5 km/hr Speed upstream = 36/12 = 3 km/hr Man’s rate in still water= (5 + 3) x ½ = 4 kmph
Bronze is an alloy of-
The pH of a neutral solution is —
The fuel that is used in modern submarines is -
The noble gas used in radiotherapy is
The element used in the manufacture of safety matches is —
Manganite is an ore/mineral of
Petroleum is a mixture of-
The nucleus of an atom consists of-
The gas used for filling weather balloons is-
The chemical name of'Common salt’
