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 : The wire of flashbulbs is made up of

Option 1: Magnesium

Option 2: Barium

Option 3: Copper

Option 4: Silver

Question : Which of the following metals is the heaviest?

Option 1: Iron

Option 2: Silver

Option 3: Nickel

Option 4: Osmium

Question : Sapphire and Ruby are varieties of natural:

Option 1: Aluminium sulphide

Option 2: Aluminium hydroxide

Option 3: Aluminium carbonate

Option 4: Aluminium oxide

Question : Aluminium salt commonly used to stop bleeding is:

Option 1: Aluminium nitrate

Option 2: Aluminium sulphate

Option 3: Aluminium chloride

Option 4: Potash alum