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The metallic constituents of hard water are 1 Magnesium, calcium and tin 2 Iron, tin and calcium 3 Calcium, ,magnesium and iron 4 None of these
Which of the following metals was first discovered by man? 1 Bronze 2 Silver 3 Iron 4 Copper
When did india conduct three under ground nuclear tests?
When an iron nail gets rusted, iron oxide is formed 1 Without any change in the weight of the nail 2 With increase in the weight of the nail 3 With decrease in the weight of the nail 4 None of these
Which of the following roofs provide better protection against heat? 1 Cement slab 2 Asbestos sheets 3 Reinforced concrete 4 None of these
Which is/are the important raw material(s) required in cement industry? 1 Limestone 2 Gypsum & clay 3 Clay 4 Limestone & clay
Who propounded the signs of the zodiac?
what are advantages & disadvantages of science?
Why we use nhexane inplace of hexane in mobilepase preparation
Why is it necessary to cook food ?
Which type of fire extinguisher is used for petroleum fire? 1 Foam type 2 Soda acid type 3 Powder type 4 None of these
The two elements that are frequently used for making transistors are 1 Boron and aluminium 2 Silicon and germanium 3 Iridium and tungsten 4 Niobium and columbium