A.One Word Answers
1.Combination of two or more cells in series is called
Ans.Battery
2.Filament of eletric bulb is made up of
Ans.Tungsten
3.Closed and continous path of electric current is called
Ans.Circuit
4.An electric cell produces electricity from the
Ans.Chemical stored in it
5.Direction of electric current in the circuit is from
Ans.Positive to negative terminals
6.A thin coil of metal, which glows when electricity is passed through it, is called
Ans.Filament
7.A device that prevents or allow the current to flow through it
Ans.Switch
8.In bulbs electricity is converted into
Ans.Light energy
9.Electricity will not flow through circuit if
Ans.Circuit is incomplete
B.Short Answers
1.. What is the purpose of using electric switch in the circuit?
Ans.The purpose of using electric switch in the circuit is to close of open the circuit as per requirement. If you want to switch off the bulb or fan we need a switch.
2. Why electrician uses rubber gloves while repairing a electric supply line?
Ans.Rubber is bad conductor of electricity. It is used by electrician to prevents from
electric shock if touch the live wire. 3. What do you mean by fused bulb? Why fused bulb do n ot glows?
Ans.If the filament of bulb that glows to produce light get broken, than such bulbs are called fused bulb. Fused bulb does not glow as circ uit is broken by the filament of bulb.
5. Define conduction of electric current.
Ans.The phenomenon of flow of current through a conduct or is called conduction. The substance through which current flow easily are cal led conductor.
6. What do you mean by open and close circuit?
Ans.In a circuit if switch is open than current does no t flow and if switch is close current flow through circuit and bulb glows.
7. What are two things required to make electric curre nt flow in a circuit?
Ans.Two things required to make electric current flow are
a. Switch must be closed.
b. Circuit should not contain any insulator.
8.What is a power station? Name a few types of power stations.
Ans.. The place where electric current is produced is cal led power house. There are two types of power stations.
a. Thermal power station
b. Hydro power station.
9. What is different between insulator and conductors? Give suitable example.
Ans.Insulators are those substances through which elect ric current can not pass and conductors are those substances through which curre nt can pass easily. All metals are conductor and plastic, rubber and clothes are insul ator.
10. The handles of screwdrivers and pliers used by elec trician for repair have plastic or rubber covering. Why?
Ans.The handles of pliers and screw-drivers have rubber or plastic covering as rubber and plastic is bad conductor of electricity. During rep airing, current may flow through the screw-driver and pliers that may cause electric sho ck to electrician in absence of insulator.
11.Name any four devices in which electric cell are us ed.
Ans.The devices in which electric cells are used are a. Torch
b. Radio
c. Tape recorder
d. Camera
12. What is electric circuit? What is the direction of current in the circuit?
Ans.The closed and continuous path of electric circuit is called a circuit. It consists of connector, cell or battery, bulb and a key.
13. Differentiate between conductor and insulator with example.
Ans.Those substances through which electric current can flow are called conductor and those substance through which electric current do n ot pass are called insulator. Copper, silver, iron are conductors and plastic, pa per, rubber are insulators.
14.Name the following:
a. An electric gadget to break the electric circuit.
b. An alloy used to make filaments of a bulb.
c. A combination two or more cells.
d. The source of electricity.
e. The two terminals of a cell.
Ans. (a) Switch
(b) Tungsten
(c) Battery
(d) Power-house.
(e) Positive and negative terminals.
C.Fill in the blanks
Fill in the gaps with suitable words.
a. Combination of two or more cells is called -------- -----------.
b. A device used to break the electric circuit is know n as ---------.
c. Each cell has ------------------- terminals.
d. ------------ is best conductor of electric current.
e. --------------- is a non- metal that conduct electr icity.
(a) Battery (b) Key (c) Two (d) Silver (e) Graphite
2.Fill in the blanks with suitable word.
a.
Electric bulb has a -------------- that is connecte d to its terminals.
b. ------------------- do not allow electric current t o pass through them.
c. The bulb glows only when ------------------- flows through the circuit.
d. Copper wire is a good ------------------- of electr icity.
e. Brightness of bulb depends on power of bulb and --- ---------- through them
(a) Filaments (b) Insulator(c) Current (d) Conducto r (e) Current.
1.Combination of two or more cells in series is called
Ans.Battery
2.Filament of eletric bulb is made up of
Ans.Tungsten
3.Closed and continous path of electric current is called
Ans.Circuit
4.An electric cell produces electricity from the
Ans.Chemical stored in it
5.Direction of electric current in the circuit is from
Ans.Positive to negative terminals
6.A thin coil of metal, which glows when electricity is passed through it, is called
Ans.Filament
7.A device that prevents or allow the current to flow through it
Ans.Switch
8.In bulbs electricity is converted into
Ans.Light energy
9.Electricity will not flow through circuit if
Ans.Circuit is incomplete
B.Short Answers
1.. What is the purpose of using electric switch in the circuit?
Ans.The purpose of using electric switch in the circuit is to close of open the circuit as per requirement. If you want to switch off the bulb or fan we need a switch.
2. Why electrician uses rubber gloves while repairing a electric supply line?
Ans.Rubber is bad conductor of electricity. It is used by electrician to prevents from
electric shock if touch the live wire. 3. What do you mean by fused bulb? Why fused bulb do n ot glows?
Ans.If the filament of bulb that glows to produce light get broken, than such bulbs are called fused bulb. Fused bulb does not glow as circ uit is broken by the filament of bulb.
5. Define conduction of electric current.
Ans.The phenomenon of flow of current through a conduct or is called conduction. The substance through which current flow easily are cal led conductor.
6. What do you mean by open and close circuit?
Ans.In a circuit if switch is open than current does no t flow and if switch is close current flow through circuit and bulb glows.
7. What are two things required to make electric curre nt flow in a circuit?
Ans.Two things required to make electric current flow are
a. Switch must be closed.
b. Circuit should not contain any insulator.
8.What is a power station? Name a few types of power stations.
Ans.. The place where electric current is produced is cal led power house. There are two types of power stations.
a. Thermal power station
b. Hydro power station.
9. What is different between insulator and conductors? Give suitable example.
Ans.Insulators are those substances through which elect ric current can not pass and conductors are those substances through which curre nt can pass easily. All metals are conductor and plastic, rubber and clothes are insul ator.
10. The handles of screwdrivers and pliers used by elec trician for repair have plastic or rubber covering. Why?
Ans.The handles of pliers and screw-drivers have rubber or plastic covering as rubber and plastic is bad conductor of electricity. During rep airing, current may flow through the screw-driver and pliers that may cause electric sho ck to electrician in absence of insulator.
11.Name any four devices in which electric cell are us ed.
Ans.The devices in which electric cells are used are a. Torch
b. Radio
c. Tape recorder
d. Camera
12. What is electric circuit? What is the direction of current in the circuit?
Ans.The closed and continuous path of electric circuit is called a circuit. It consists of connector, cell or battery, bulb and a key.
13. Differentiate between conductor and insulator with example.
Ans.Those substances through which electric current can flow are called conductor and those substance through which electric current do n ot pass are called insulator. Copper, silver, iron are conductors and plastic, pa per, rubber are insulators.
14.Name the following:
a. An electric gadget to break the electric circuit.
b. An alloy used to make filaments of a bulb.
c. A combination two or more cells.
d. The source of electricity.
e. The two terminals of a cell.
Ans. (a) Switch
(b) Tungsten
(c) Battery
(d) Power-house.
(e) Positive and negative terminals.
C.Fill in the blanks
Fill in the gaps with suitable words.
a. Combination of two or more cells is called -------- -----------.
b. A device used to break the electric circuit is know n as ---------.
c. Each cell has ------------------- terminals.
d. ------------ is best conductor of electric current.
e. --------------- is a non- metal that conduct electr icity.
(a) Battery (b) Key (c) Two (d) Silver (e) Graphite
2.Fill in the blanks with suitable word.
a.
Electric bulb has a -------------- that is connecte d to its terminals.
b. ------------------- do not allow electric current t o pass through them.
c. The bulb glows only when ------------------- flows through the circuit.
d. Copper wire is a good ------------------- of electr icity.
e. Brightness of bulb depends on power of bulb and --- ---------- through them
(a) Filaments (b) Insulator(c) Current (d) Conducto r (e) Current.
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