Available Answers

1. 1.

   Fill in the blanks.

   1. The ________ wire has no current flowing through it.
   2. ________ electricity is produced due to flow of electrons.
   3. A fuse wire should have low ________ .
   4. When the number of protrons is lesser than the number of electrons, the charge on the body is _________.
   5. An ebonite rod rubbed with fur becomes _________ charged.
   6. Charging by conduction is also known as _________.
   7. When a neutral object is charged by friction, it acquires the charge of ________ nature as that on the other body.
   8. In charging by induction method, the charge acquired by the neutral object is said to be ________ charge.
   9. An _________ is a device that is used for detection of a Small amount of charge on a body.
   10. The metallic leaves of a gold-leaf electroscope are very _________ even to Small distribution of charge.
   11. __________ is a high energy electric discharge that takes place in the atmosphere.
   12. __________ is a long metal rod fixed on top of the building.
2. 2.

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

   1. The earth and neutral wires have no current flowing through them.
   2. The fuse has a thin wire whose melting point is lower than the melting point of the metals used to make the conducting wires.
   3. When an electricity charged body comes in contact with an electrically neutral body, there is no transfer of charge between them.
   4. A neutral atom contains unequal number of protrons and electrons.
   5. The number of electrons present in the innermost orbit of an atom are called valence electrons.
   6. A glass rod acquires positive charge on rubbing with silk cloth.
   7. An electroscope gives information about the electrons only.
   8. One should not use a corded telephone during a thunderstorm.
3. 3.

   Match the columns.

   Column A	Column B
   1. Electric energy	a. Kilowatt
   2. Live wire	b. Kilowatt hour
   3. Electrical power	c. Blue
   4. Earth wire	d. Megajoule
   5. 1 Unit of electricity	e. Brown
   6. Neutral wire	f. Green

4. 4.

   Show charging an object in a form of flowchart.

5. 5.

   Show charge identification by an electroscope in a form of flowchart.

6. 6.

   The valence electrons can be easily knocked off and become free. Give reasons.