Available Answers

1. 1.

   For what purpose do the following appliances use electric current?

   1. Fan
   2. Mixer
   3. Music system
   4. Washing machine
2. 2.

   If the filament of a bulb is broken, would the bulb glow? If yes, give reason.

3. 3.

   Why are nichrome and tungsten wires used in electrical appliances producing heat?

4. 4.

   If the direction of the current is reversed by changing the electric cell connections, then in which direction will the magnet show deflection?

5. 5.

   Check point

   1. is a symbol of _____________.
      1. Cell
      2. Battery
      3. Bulb
      4. Switch
   2. It is a component of an electric bell.
      1. Hammer
      2. Torch
      3. Knife
      4. Screw driver
   3. It is another name of a switch in an electric circuit.
      1. Key
      2. Fuse
      3. Cell
      4. Electric wire
   4. The fuse wire is _____________.
      1. An insulator with low melting point
      2. A conductor with high melting point
      3. An insulator with high melting point
      4. A conductor with low melting point
   5. Which of these uses magnetic effect of electric current?
      1. Washing machine
      2. Refrigerator
      3. Room heater
      4. Electric bell
6. 6.

   True-False:

   1. An electric bell has an electromagnet.
   2. The broken circuit is said to be open.
   3. When the electric current exceeds a certain limit, the fuse wire melts and breaks.
   4. To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.
   5. Metals are conductors.
   6. An electromagnet looses its magnetism, when the current stops flowing through it.
   7. To connect the cells for batteries, we can use a cell holder.
   8. Electromagnets are permanent magnets.
   9. In the symbol of wire, three parallel and vertical lines are drawn.