1. Multiple choice questions:
1.1 conductors can conduct electricity because they have free
A. Protons
B. Electron
C. Neutrons
D. Both A & B.
1.2 lightning cannot Strike
A telephone cords
B. Electrical wires
C. Metal pipes
D. Plastic toy
1.3 a miniature circuit breaker is an automatically operated
A. Electrical switch
B. Socket
C. Battery
D. Plug
1.4 the outer body of a switch is made of
A. Bakelite
B.Brass
C.coppet
D.plastic
1.5 the colour of live wire is
A.yellow
B.red
C.blue
D.green
2. Fill in the blanks:
2.1 the working of fuse depends on the....... of the current.
2.2 electric tools used should have proper..... handles.
2.3 Avoid ....... wires,cables and connections
2.4 The ..... . May cause melting of wires with the risk of Fire.
2.5 the electric shock occurs when the.. flows through the body
3. Define the following terms:
3.1 earthing
3.2 miniature circuit breaker
3.3 charging by conduction
3.4 battery
3.5 overloading of electric circuit
3.6 electroscope
3.7 short circuit
3.8 electric fuse
3.9 lightning
3.10 kilowatt - hour
4. Answer the following in brief:
4.1 name the sub atomic particles of an atom. What kind of charges are present on them.
4.2 list the methods of charging and object.
4.3 how do objects gets charged?
4.4 what do you mean by atmospheric electricity?
4.5 what is an electric circuit. Draw its diagram.
5. Answer the following questions in detail:
5.1 describe the principle and working of an electric fuse.
5.2 what is the reason of short circuit and overloading?
5.3 what is electric fuse and its basis of working?
5.4 explain law of conservation of charge with the help of an example.
5.5 write six precautions to be taken while handling electricity.
6 give reasons:
6.1 what is the reason of static electricity?
6.2 what is the reason for getting an electric shock?
6.3 why do we install lightening conductor on tall buildings?
6.4 how do conductors conduct electricity,
6.5 while charging by friction, how can the charge be acquired by rubbing to different objects together?
7. Concept based questions
7.1 explain the working of an electroscope.
7.2 how does Benjamin franklin's kite and key experiment demonstrated the connection between lightning and electricity?
7.3 why does a com run through dry hair attract pieces of paper?
8. Analysis based questions
8.1 why should we keep away from water when there is lightning? Analyse the fact and explain.
8.2 earthing system protects us from electric shock. However some devices do not have Earth wire. Why is it a wrong practice?Explain it.
9.Hot questions:
9.1 why are there two metallic plates attached to the bell jsr of an electroscope?
9.2 pure water does not conduct electricity whereas tap water can.explain.
9.3 why do leaves of a gold leaf electroscope diverge when given a charge?
9.4 how does charging of an object occur by conduction?
9.5A is a metallic rod carrying an access of negative charge,B is a positively charged wooden sphere. What will happen if we touch A with B?
