Question : Which material is used in the manufacturing of electric heater coil?
Option 1: Copper
Option 2: Iron
Option 3: Nickel
Option 4: Nichrome
Correct Answer: Nichrome
Solution : The correct option is Nichrome.
The most common substance utilized to make heating coils is nichrome. It is a nickel and chromium alloy recognised for its electrical resistance and resistance to oxidation and deformation at high temperatures.
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Question : Which of the following are the main components of stainless steel?
Option 1: Iron and carbon
Option 2: Silver
Option 3: Iron, chromium and nickel
Option 4: Iron and nickel
Question : Which of the following is used for the preparation of Dynamite?
Option 1: Methyl alcohol
Option 2: Iron oxide
Option 3: Nitroglycerin
Option 4: Copper sulphate
Question : Which of the following metals is the heaviest?
Option 1: Iron
Option 4: Osmium
Question : Corundum is an ore of:
Option 1: aluminium
Option 2: silver
Option 3: copper
Option 4: iron
Question : Iron nails become ______ after being dipped in copper sulphate solution.
Option 1: bluish
Option 2: greenish
Option 3: greyish
Option 4: brownish
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