The purest form of iron is 1 Steel 2 Cast iron 3 Pig iron 4 Wrought iron

Soda water contains 1 Nitrous acid 2 Carbonic acid 3 Carbon dioxide 4 Sulphuric acid

The element found on the surface of the moon is 1 Tin 2 Tungsten 3 Tantalum 4 Titanium

Old-written material, which cannot be read easily, can be read by 1 Cosmic rays 2 Ultraviolet rays 3 Infra red rays 4 None of these

The main important feature of neutron bomb is that when it is dropped on a city, it would damage 1 Both the living organisms and buildings 2 The buildings but not the living organisms 3 The living organisms but spare buildings 4 None of these

Wood is the main raw material for the manufacture of 1 Paint 2 Paper 3 Ink 4 Gun powder