…………… 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.

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

Assertion (A): Rourkela Steel Plant produces raw material used in the manufacture of fertilizers.

Reason (R): It produces a large quantity of nitrogen as a by-product.

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.