Available Answers

1. 1.

   Write true or false for each statement:

   1. A current carrying coil when suspended freely can rest in any direction.
   2. A coil carrying current behaves like a magnet.
   3. In an electromagnet, the core is made up of copper.
   4. An electric bell uses an electromagnet.
   5. An electromagnet with soft iron core is a temporary magnet.
   6. We use cell as the source of electricity to run an electric immersion rod.
   7. A torch bulb glows if the terminals of the bulb are connected to the terminals of a cell by the metallic wire.
   8. Wool is a conductor of electricity.
   9. Silver is am insulator of electricity.
   10. Our body is a conductor of electricity
   11. For a circuit to be complete, every pat of it must be made up of conductors.
   12. All metals are conductors of electricity.
   13. The switch should not be touched with wet hands.
   14. A switch is an on-off device in an electric circuit.
2. 2.

   Fill in the blanks:

   1. A magnet has ____________ poles.
   2. Like poles ____________ each other and unlike poles ____________.
   3. An electromagnet is used to separate large mass of ____________ scrap.
   4.  The strength of magnetic field of an electromagnet is increased by inserting a core
      of ____________.
   5. In a torch, we use ____________ as the source of electricity.
   6. To light a table lamp and to run a refrigerator, we use ____________ as the source of electricity.
   7. A group of two or more cells is called a ____________.
   8. ____________ pass electricity through them.
   9. ____________ do not pass electricity through them.
3. 3.

   Match the following:

   Column A	Column B
   Human body Silk thread Charge in motion Soft iron Electromagnet	electric bell  current  conductor  electromagnet insulator

4. 4.

   Select the correct alternative:

   1. A freely suspended magnet rests in :
   2. Electromagnets are made up of :
   3. An electromagnet is used in :
   4. The purpose of armature in an electric bell is :
   5. In a torch, the source of electricity is :
   6. Electricity can flow through :
   7. Electricity does not flow through :
   8. We should not touch the switch with wet hands, otherwise :
5. 5.

   State two properties of a bar magnet.

6. 6.

   How will you test whether a given rod is a magnet or not?