Available Answers

1. 1.

   Fill in the blanks:

   1. An atom is electrically ____________ because the total number of electrons are  ____________ to the total number of protons.
   2. The SI unit of electric current is ____________.
   3. Electric current flows from ____________to ____________.
   4. ____________ cells cannot be recharged.
   5. A dry cell gives a voltage of ____________.
2. 2.

   Fill in the blanks:

   1. Outside the magnet, the direction of magnetic lines of force is from ____________ pole to ____________ pole.
   2. The magnetic field around a magnet ____________ with distance.
   3. ____________ batteries are designed to be recharged and used a number of times.
   4. An electric bell is an application of the phenomenon of ____________.
   5. The connecting wires are usually made up of ____________.
   6. Leclanche cell is an example of ____________ cell.
   7. An electric cell is represented by two vertical lines of ____________ lengths.
3. 3.

   State whether the following statements are true (T) or false (F). Correct the false statements:

   1. Lodestone is a natural magnet.
   2. Magnetic lines form closed as well as open curves in a magnetic field.
   3. An electromagnet works on the principle of heating effect of current.
   4. All metals have free electrons that conduct electricity.
   5. The direction of conventional current is from the positive terminal to the negative terminal.
   6. Most of the non-metals are conductors.
   7. In a series combination, all appliances work independent of each other.
4. 4.

   Choose the correct option:

   1. A freely suspended magnet always points in the ________________ direction.
   2. Which of the following is not the property of magnetic lines of force?
   3. Magnets are used in ________________.
   4. The frequency of the ringing of an electric bell can be altered with the help of the    ________________.
   5. ________________ is the true test of magnetism.
   6. On increasing the strength ot an electriccurrent, the number of magnetic lines of force  ________________ .
   7. The strength of the magnetic held produced by a solenoid can be altered by changing ________________.
   8. The low of electric charge is called ________________.
   9. The SI unit of electric current is ________________.
   10. The symbol →←←← represents ________________.
5. 5.

   Match the columns:

   Column A	Column B
   Lodestone Magnetic compass Magnetic lines of force Electromagnet Magnetic field	Magnetic field due to current Region around a magnet where its influence can be felt Used by sailors and navigators Naturally-occurring magnet Closed loops around the magnet

6. 6.

   Show the following process in form of a flowchart.

   Movement of free electrons.