…………… is used for hardening of steel.

1. Manganese
2. Copper
3. Nickel
4. Chromium

Assertion (A): Mineral based industry forms the backbone of industrial development.

Reason (R): It provides raw material for industrial and consumer goods as well as infrastructure.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Iron is galvanised by using chromium, …………… and tungsten.

1. copper
2. silica
3. carbon
4. nickel

The molten iron that is obtained by the process of ore reduction is known as …………… .

1. Cast iron
2. Wrought iron
3. Pig iron
4. Steel