Practice questions based on chapter 8 ( electricity ) for class 8

 1. Define and explain electroscope with suitable diagram. Why are  there two metallic plates attached to the bellJar of an goldleaf electroscope?

2.An Atom is electrically neutral. When you comb your dry hair,it attracts pieces of paper.Explain it.

3. What is static electricity and  how is it produced? Explain the  process of induction with the help of suitable diagram.

4. Solar energy is available to all of us absolutely free of cost.Then why very few people have used solar panels to produce electricity?

5.An electrical appliance of power 2.5 KW is used for 8h each day. Find

A. The electrical energy consumed in kilowatt hour , each day.

B.The electrical energy consumed in 90 days.

6. In a premise 10 bulbs each of 100 watt, 4 fans each of 60 watt, 4 A.C's  each of 2 kilowatt are used for 8 hours Per day.Find

A. Total power consumed per day.

B. Total power consume in one year.

C. Total electrical energy consumed in 180 days.

D. The cost of electricity at the rate of₹ 8.25 per unit.

7. An electrical appliance is rated as 100W - 220V.

A. What do you understand by this statement?

B. How much current will flow through the appliance when in use?

8. Is it possible to charge a conductor? If yes then explain the different methods of charging a conductor.

9. How will you use a good leaf electroscope to find out whether the charge on a charged body is positive or negative? Draw a well labelled diagram of a gold leaf electroscope and describe its construction as well as working.

10. Why lightning occurs? Is it possible to protect our buildings from lightning? If yes then explain it in detail.