Electricity

Which of the following is a good conductor of electricity?

• Glass

• Copper

• Wood

• Silver

Which of the following is an Insulator?

• Silver

• Iron

• Paper

• Glass

Which of the following is a set of only Insulator?

• Iron ,copper and nickel

• Plastic , gold and water

• Pure water, plastic and paper

• None of thses

Cell is a device which

• converts chemical energy into electrical energy

• electrical energy into light energy

• electrical energy into magnetic energy

• None of these

A bulb has

• two terminals and one filament

• two terminals and two filaments

• multiple terminals and single filament

• single terminal and single filament

which one is open circuit

• 
• 

• i) carbon rod

  ii) manganese oxide

  iii)ammonium chloride electrode

• i) carbon rod

  ii) cooper oxide

  iii)ammonium chloride electrode

• i) carbon rod

  ii) manganese oxide

  iii)separator

• i)ammonium chloride electrolyte

  ii) manganese oxide

  iii) carbon rod

In an electric bulb, light is produced due to the glowing of

• the glass case of the bulb.

• the thin filament..

• the thick wires supporting the filament.

• gases inside glass case of the bulb.

Filament of a torch bulb is

• a metal case.

• metal tip at the centre of the base.

• two thick wires

• a thin wire.

Choose the incorrect statement.

• A switch is the source of electric current in a circuit

• A switch help to complete or break the circuit.

• A switch helps us to use electricity as per our requirement

• When the switch is open there is an air gap between its terminals.