Question : Which material is used in the manufacturing of electric heater coil?

Option 1: Copper

Option 2: Iron

Option 3: Nickel

Option 4: Nichrome

Question : Iron nails become ______ after being dipped in copper sulphate solution.

Option 1: bluish

Option 2: greenish

Option 3: greyish

Option 4: brownish

Question : Which of the following statements is correct?

Option 1: Zinc oxide is a form of rust.

Option 2: Copper can also turn into rust upon hydration.

Option 3: Chemically, rust is hydrated ferric oxide.

Option 4: Chemically, rust is a non-hydrated ferric oxide.

Question : Which of the following is used to make lightweight but strong plastic?

Option 1: Nylon

Option 2: Polythene

Option 3: Polyvinyl chloride

Option 4: Methyl methacrylate

Question : Corundum is an ore of:

Option 1: aluminium

Option 2: silver

Option 3: copper

Option 4: iron