Which one of the following is a good conductor of electricity?

Materials are classified as conductors or insulators based on their ability to allow the flow of electric charge. Glass is explicitly identified as an insulator with high resistivity [3]. Ebonite, a form of hard vulcanized rubber, is used in electrostatic experiments because it is a non-conductor that can hold a charge [4]. Shellac is a natural resin used for its insulating properties in varnishes and lacquers. In contrast, the human body is a conductor of electricity. This is evidenced by the fact that insulators like rubber and plastics are used to cover wires and tools specifically to protect people from electric shocks [2]. The human body contains electrolytic solutions (ions in water) which facilitate the flow of electric current. Therefore, among the given options, the human body is the only material that acts as a conductor.

Sources

1. [3] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > Activity 11.3 > p. 179
2. [4] Science-Class VII . NCERT(Revised ed 2025) > Chapter 7: Heat Transfer in Nature > 7.1 Conduction of Heat > p. 91
3. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 3: Electricity: Circuits and their Components > 3.2 A Simple Electrical Circuit > p. 36
4. [2] Science-Class VII . NCERT(Revised ed 2025) > Chapter 4: The World of Metals and Non-metals > 4.1.5 Conduction of electricity > p. 48