DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage -1 Those materials which do not allows electric current to pass through them are called insulators e.g., air, cork, rubber, thermocole, paper, etc. Insulators are used for covering electrical wires, plug tops, switches and other parts of electrical appliances. House wiring electric wires are generally covered with rubber. It is because, rubber is

• A. a good conductor        
• B. a partial conductor
• C. easily available           
• D. an insulator