## Class 6 - Science

#### Electricity and Circuits

Q&A
Question:

If you touch an electric wire carrying current you get a shock, but if on the same wire the birds sit they do not get any shock/current. Explain why?

When we hold the wire carrying current then the circuit is closed and the current flows from our body and enters earth but the birds sitting on the same wire do not get any current as the circuit is not complete. If the bird touches the earth wire, it will also die due to electric shock.

Electricity and Circuits - Questions
1.

Using the"conduction tester” on an object it was found that the bulb begins to glow. Is  that object a conductor or an insulator? Explain.

2.

What is solar cell?

3.

Mention two advantages of a dry cell.

4.

Name the +ve terminal of dry cell.

5.

Define conductors and insulators. Give one example of each.

6.

Fill in the blanks:
(a) A device that is used to break an electric circuit is called_______________
(b) An electric cell has___________

7.

What is open circuit?

8.

Mark ˜True' or ˜False' for the following statements:
(a) Electric current can flow through metals.
(b) Instead of metal wires, a jute string can be used to make a circuit.
(c) Electric current can pass through a sheet of thermocol.

9.

Would the bulb glow after completing the circuit shown in Fig. 12.9 if instead of safety pin we use an eraser?

10.

11.

The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?

12.

Give one activity to prove that air is an insulator.

13.

Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.

14.

What is dry cell?

15.

Name the scientist who invented electric cell and the scientist who invented electric bulb.

16.

What is the direction of flow of current in a dry cell?

17.

Name the -ve terminal of a dry cell.

18.

Explain why the bulb would not glow in the arrangement shown in fig

19.

Write one use of insulators.

20.

What is the name of thin wire in the electric bulb?

21.

If you touch an electric wire carrying current you get a shock, but if on the same wire the birds sit they do not get any shock/current. Explain why?

22.

What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.

23.

In any electric circuit, when the switch is on and the current flows through it why do the wire, switches, bulb or devices become hot?

24.

The headlights of a car have reflectors behind the bulb. What is the function of reflectors?

25.

Would the bulb glow in the circuit shown in Fig. 12.11.

26.

(1)What is electric circuit?
(2)How many types of electric circuit are there? Define them.
(3)Draw a diagram to show the closed circuit for switch, bulb and dry cell.

27.

Mark ˜True' or ˜False' for the following statements:
(a) Electric current can flow through metals.
(b) Instead of metal wires, a jute string can be used to make a circuit.
(c) Electric current can pass through a sheet of thermocol.

28.

Draw a diagram showing the two terminals of a bulb.

29.

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.

30.

Draw the circuit diagram for operating a bulb with the help of a dry cell.

31.

Identify conductors and insulators from the following:Eraser, paper, matchstick, copper wire, pencil lead, polythene