Site Title
Fill inthe blanks:
1. The charge on an ebonite rod is negative.
2. The smallest particle of matter is called atom.
Match the Pair:
1. Lightning Conductor-Lightning
2. Glass Rod- Positive Charge
True or False:
1. Static electric charge is of two types. True
2. An atom may have either a positive or a negative charge. False
Answer in one sentence:
1. Who has done the experiments on static electricity?
Ans: Thales, A Greek scientist has done the experiments on static electricity.
Answer in Short:
1. Why charge developed due to friction is called static electric charge?
Ans: Generally, an electric charge developed by rubbing bad conductors of electricity. As this charge remains still on an object on which it developed it is called as static electric charge.
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Answer in One Word:
1. Vibrations produced by a flute - Air column
2. Speed of Sound- 340 m/sec
Give Reasons:
1. An atom does not have any charge.
Ans: Every atom contains positively and negatively charged particle in equal proportion. These particles naturalize each other. As the result an atom does not have any charge.
2. Describe the principle, construction and working of gold leaf electroscope.
Principle: Gold leaf electroscope is used to identify electric charge on the principle of repulsion of electric charges.
Construction: In this electroscope a metal disc or ball is attached to one end of a copper or aluminum rod. To the other end are attached two thin metal levees. This rod is fitted in one-holed cork stopper and stopper is fitted on a conical flask in such a way that the metal leaves will inside the flask and disc, outside Cork is a bad conductor.
Working: If the body with no charge is made to touch the disc of the electroscope the leaves at other end remain closed. When if positively or negatively charged body is brought in contact with disc, the like charges developed on the leaves and they repel each other and fly apart.
DRAW A WELL-LABELLED DIAGRAM OF GOLD LEAF ELECTROSCOPE
Use above diagram.