Question

A substance that has very low resistivity is a

• A. good conductor.
• B. resistor.
• C. insulator.
• D. none of these

Answer 1

The correct option is A

good conductor.

Explanation for the correct option- (A) good conductor

1. Substances that have low resistivity are called conductors.
2. Resistivity is an intrinsic property of the material that measures how strongly a substance can oppose a flow of current through it. Therefore, the lower the resistivity, the better the conductor.
3. A conductor allows electric current to pass through it easily.
4. The substances that have a resistivity in the range of ${10}^{-8}\Omega m$ to ${10}^{-6}\Omega m$ are known as good conductors.
5. Example- Copper, aluminum wire, etc.

Explanation for the incorrect options- (B) resistor

1. Resistors are substances with finite electrical resistivity.
2. Example- tungsten, nichrome, etc.

(C) Insulator-

1. Insulators are substances with infinitely high resistivity.
2. Example- plastic, rubber, etc.

(D) None of these-

Since option (A) is correct, this option is incorrect.

Hence, option (A) is correct.