Identify the correct statement (s) from among the following.
1. Resistivity of material is dependent on the nature of the material.
2. Resistivity of a material is independent of the area of cross section.
3. Resistivity of a pure metal is more than its alloy.

Correct option is C

The correct answer is (C) Both (1) and (2)

Solution:

1. Resistivity of material is dependent on the nature of the material.

• Correct. Resistivity is an intrinsic property of a material, meaning it is determined by the material’s composition and structure. For example, metals, insulators, and semiconductors all have different resistivities.

2. Resistivity of a material is independent of the area of cross-section.

• Correct. Resistivity is an intrinsic property of the material and does not depend on the shape or size of the material. The area of cross-section affects resistance (R), but resistivity (ρ) is independent of this.

3. Resistivity of a pure metal is more than its alloy.

• Incorrect. The resistivity of a pure metal is usually lower than that of its alloy. Alloys generally have more impurities and crystal defects, which increase their resistivity compared to pure metals.