Permanent hardness of water may be removed by the addition of 1 Alum 2 Sodium carbonate 3 Lime 4 Potassium permanganate3 12445
The purest form of iron is 1 Steel 2 Cast iron 3 Pig iron 4 Wrought iron21 61691
Of the following metals which, one pollutes the air of a big city? 1 Copper 2 Chromium 3 Lead 4 Cadmium3 13831
The element required for solar energy conversion is 1 Beryllium 2 Silicon 3 Tantalum 4 Ultra pure carbon2 5864
Which of the following is the most stable element? 1 Uranium 2 Hydrogen 3 Oxygen 4 Lead6 12504
Which of the following is a good nuclear fuel? 1 Uranium-238 2 Neptunium-239 3 Thorium-236 4 Plutonium-2398 20801
Which type of fire extinguisher is used for petroleum fire? 1 Foam type 2 Soda acid type 3 Powder type 4 None of these8 21755
Which of the following is commonly called a ‘polyamide’? 1 Rayon 2 Orlon 3 Terylene 4 Nylon3 12620
Rusting of iron involves 1 Oxidation 2 Reduction 3 Displacement 4 Decomposition5 29615
A mixture of water and alcohol can be separated by 1 Filtration 2 Evaporation 3 Distillation 4 Decantation4 25209
Cooking oil can be converted into vegetables ghee by the process of 1 Oxidation 2 Hydrogenation 3 Distillation 4 Crystallization4 18065
The chemical used as a ‘fixer’ in photography is 1 Borax 2 Sodium thiosulphate 3 Sodium sulphate 4 Ammonium persulphate1 10647
Study of life in outer space is called A) Endobiology B) Exobiology C) Entrobiology D) Neobiology15 37126
Activity of an enzyme can be modulated by change of [a] pH [b] Light [c] Humidity [d] Rainfall1 5398
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