6th Standard Science ( Electricity and Circuits )

Electricity and Circuits

I.Fill in the blanks
a. A device that is used to break an electric circuit is called Switch

b. An electric cell has Two

 

II.Mark ‘ True” or ‘False’ For the following statement.
a. Electric current can flow through metals True

b. Instead of metals wires, a jute string can be used to make a circuit False

c. Electric current can pass through a sheet of thermocol False

 

III. Answer the following:

1. Explain why the bulb would not glow in the arrangement show in fig
Ans:

 

The bulb would not glow in the arrangement shown in the figure because the one end of tester/ screw driver is made up of plastic which does not allow the electric current to flow through it

 

2.Complete the drawing shown in Fig 12.9 to indicate where the free ends of the two wires should be joined to make the bulb glow
Ans:

 

3.What is the purpose of using an electric switch. Name some electrical gadgets that have switches built into them.
Answer:An electric switch helps in making as well as breaking the circuit without removing the connection When switch is ON, the current will flow in the circuit, thus, it also saves electricity and make the use of appliances easier. Some electric gadgets are: Television, iron box, Washing machine, Refrigerator etc.

 

4.Would the bulb glow after completing the circuit shown in Fig 12.14 if instead of safety pin we use an eraser
Ans:

No, the bulb will not glow when we use an eraser instead of safety pin even after circuit is complete because rubber is an insulator and current will not flow through it

 

5.Would the bulb glow in the circuit shown in Fig 12.15
Ans:

No, the bulb will not glow because the wires from both terminal of the battery are connected to the one terminal of the bulb.
In order to make the bulb glow, wires should be connected to the terminals of the bulb

 

6.Using the ‘conduction tester’ on an object it was found that the bulb be gins to glow Is that object a conductor or an insulator? Explain.
Ans: That object must be an insulator because it allows the current to flow through it and thus helped in the glowing of bulb.

 

7.Why should an electrician use rubber glows while repairing an electric switch at your home ? Explain.
Ans: Rubber gloves are insulator which do not allow the current to flow through it. Therefore an electric use ribber gloves while repairing an electric switch at your home because it protect them from the shock of electricity and for the safety purpose.

 

8.The handles of the tools like screwdriver and pliers used by electricians for repair work usually have plastic or rubber covers on them can you explain why?
Ans:The handles of the tools like screw-driver and pliers used by electrician for repair work usually have plastic or rubber covers on then as plastic is an insulator which protect the electrician from severe electric shocks and accidents