Page 152 - Science Class 08

4. A nega vely charged body is one which has ___________ electrons than protons.

5. _____________________ said that the wire cord can be used to protect the buildings from
lightning strike.
C. Write True or False.
1. Charges produced by rubbing depends on the nature of the objects rubbed together.

2. A body is said to be uncharged when it has equal number of electrons and protons.
3. By induc on, a body can be charged by bringing a charged body in contact of it.
4. With the help of electroscope, we can know whether a body is posi vely or
nega vely charged.
5. Sta c electricity does not flow through the electric wire.
D. Very short answer ques ons.

1. What is electricity?
2. What is electrical charge?
3. What are cons tuents of an atom?

4. What is electroscope?
5. What is current electricity?
6. How can we protect our buildings from lightning?
E. Short answer ques ons.

1. How can an object be charged?
2. How is sta c electricity different from current electricity?
3. How do ma er get charged?

4. How can an object be charged by induc on?
5. Write the construc on of electroscope.
6. How can you know the nature of charge on a body?
7. Differen ate between insulators and conductors.

F. Long answer ques ons.
1. Explain how lightning occurs between two clouds during a storm.
2. Explain the process of lightning striking a building or tree.
3. In what way is lightning useful?

4. Write the func on of lightning conductor.

Project ActivityActivityActivity
Project
Project
Project Activity
Draw a labelled diagram of a gold-leaf electroscope. Describe how you will use it to detect a
charge, to measure a charge and to find the nature of the charge.

HO
HOTSTSTS
HO
HOTS
A. Why do you think charging by rubbing happens the best way, in dry weather?
B. Why are taller buildings in greater danger of being struck by lightning?

152 Science-8