Question

Choose the correct statements.

i. The metal cap of an electric cell is a negative terminal.
ii. The filament of a bulb is generally made of tungsten.
iii. Current always flows in an open electric circuit.

• A.
  i and ii only
• B.
  All i, ii, and iii
• C.
  ii and iii only
• D.
  Only ii

Answer 1

The correct option is D

Only ii

• The metal cap is the positive terminal of the electric cell and the metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
• The filament of a bulb is generally made of tungsten. Tungsten has a high melting point. When the electric current is passed through the filament, it becomes red hot and produces light.
• Electric current flows in the circuit only if the circuit is closed.