Science

Electricity and Circuits

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?

Answer:

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.

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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.

Give one activity to prove that air is an insulator.

Q 11.

What is solar cell?

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.

Define conductors and insulators. Give one example of each.

Q 27.

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 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