Question

1. For an electric circuit to work efficiently, it must have -

A. A source of electric current

B. Connecting wires of metal

C. A bulb

D. All of these

2. Which of the following is a good conductor of electricity ?

A. Salt solution

B. Mercury

C. Graphite

D. All of these

Answer 1

Answer:

1.D. All of these

2.C. Graphite

Answer 2

Answer:

first question's answer is (D) all of these

And second's answer is also (D) all of these