## Class 6 - Science

#### Electricity and Circuits

Q&A
Question:

Write one use of insulators.

Insulators are used in making switchboard, handles of testers, screw drivers.

Electricity and Circuits - Questions
1.

What is solar cell?

2.

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?

3.

Mention two advantages of a dry cell.

4.

What is dry cell?

5.

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.

6.

Give one activity to prove that air is an insulator.

7.

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

8.

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

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.

Name the +ve terminal of dry cell.

12.

What is open circuit?

13.

Write one use of insulators.

14.

Define conductors and insulators. Give one example of each.

15.

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.

16.

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

17.

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

18.

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.

19.

Name the -ve terminal of a dry cell.

20.

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

21.

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

22.

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

23.

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

24.

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?

25.

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?

26.

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

27.

(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.

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