Science

Electricity and Circuits

Question:

What is solar cell?

Answer:

A device which converts solar energy into electrical energy.

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Electricity and Circuits

Q 2.

Name the -ve terminal of a dry cell.

Q 3.

Name the +ve terminal of dry cell.

Q 4.

Would the bulb glow in the circuit shown in Fig. 12.11.
ncert-solutions-for-class-6th-science-chapter-12-electricity-and-circuits-4

Q 5.

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

Q 6.

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?

Q 7.

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

Q 8.

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

Q 9.

Write one use of insulators.

Q 10.

What is solar cell?

Q 11.

Give one activity to prove that air is an insulator.

Q 12.

What is dry cell?

Q 13.

Draw a diagram showing the two terminals of a bulb.

Q 14.

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?

Q 15.

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

Q 16.

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.

Q 17.

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?

Q 18.

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

Q 19.

What is open circuit?

Q 20.

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

Q 21.

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.

Q 22.

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

Q 23.

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

Q 24.

Mention two advantages of a dry cell.

Q 25.

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

Q 26.

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.

Q 27.

Define conductors and insulators. Give one example of each.

Q 28.

Explain why the bulb would not glow in the arrangement shown in fig
ncert-solutions-for-class-6th-science-chapter-12-electricity-and-circuits-1

Q 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.
ncert-solutions-for-class-6th-science-chapter-12-electricity-and-circuits-2

Q 30.

(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.

Q 31.

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