Which metal was first discovered by man ? ?->(Show Answer!)

1. Which metal was first discovered by man ?

Answer: Copper

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MCQ->The simplest method of welding two pieces of metal together is known as pressure welding.The ends of a metal are heated to a white heat-for iron,the welding temperature should be about 1300C-in a flame.At this temperature the metal becomes plastic.The ends are pressed or hammered together,and the joint is smoothed off.Care must be taken to ensure that surfaces are thoroughly clean first,for dirt will weaken the weld.Moreover,the heating of iron or steel to a high temperature cause oxidation,and a film of oxide is added to the heated surfaces.For this reason,flux is applied to the heated metal.At welding heat,flux melts and the oxide particles are dissolved in it together with any other impurities which may be present.The metal surfaces are pressed together,and the flux is squeezed out from the center of the weld.A number of different types of weld may be used,but for fairly thick bars of metals,a vee-shaped belt should be normally employed.It is rather stronger than ordinary butt weld. The simplest way of welding two pieces of metal together is...

MCQ->Which metal has so far not been discovered in Harappan sites? Copyright www.examrace.comWhich metal has so far not been discovered in Harappan sites? Copper Gold Silver IronRead more at: http://www.examrace.com/SPSC/Chhattisgarh-PSC/CGPSC-Exam-Papers/CGPSC-General-Studies-2011-Solved-Paper-Part-1.htmlCopyright www.examrace.com...

MCQ->A man had two blacksmiths for his neighbours.Their names were Pengu and Shengu.The man was greatly troubled by the noise of their hammers.He decided to talk to them.The next day he called both of them and offered Rs100 each,if they found new huts for themselves.They took the money and agreed to find new huts for themselves.The next morning,he got up again to the sound of their hammers.He went out to see why the blacksmiths hadn't found new huts and he discovered that Pengu and Shengu had kept their promise.They had exchanged their huts. The man was troubled because...

MCQ->S1: The Bhagavadgita recognises the nature of man and the needs of man. P : All these three aspects constitute the nature of man. Q : It shows how the human being is rational one, an ethical one and a spiritual one. R : More than all, it must be a spiritual experience. S : Nothing can give him fulfilment unless it satisfies his reason, his ethical conscience. S6: A man whom does not harmonise them, is not truly human. The Proper sequence should be:...

MCQ->In the following passage some of the words have been left out. Read the passage carefully and choose the correct answer for the given blank out of the four alternatives. There is an old story told of a man who ____into a deep sleep. His friend stayed by him as long as he____. Being compelled to go and fearing that he might be in want, the friend hid a_____in the old man's garment. When the old man____, not ____ that his friend had _____a jewel in his garment, he wandered about in _____, hungry. A long time afterwords, the two men met again. The friend told the poor man about the jewel and____him to look for it. Like the old man in the story, people _____about in this life, ____of what is hidden away in their inner nature, pure and untarnished. ____of what is hidden away in their inner nature, pure and untarnished....

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