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CBSE 6th Science Unit 12 Electricity and Circuits Book Back Questions | QB365

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CBSE 6th Science Unit 12 Electricity and Circuits Book Back Questions

Published on: 07/09/2019

Electricity and Circuits

Download CBSE Class 6th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 6th Standard CBSE Science

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Std: 6th Standard CBSE - Science

chapter: - Model Question paper

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Questions:

Generic 3

5 x 3 = 15

Briefly explain about the components present inside the cell.

Discuss briefly that how switch works.

You are provided with a bulb, a cell, a switch and some connecting wires. Draw a diagram to show the connections between them to make the bulb glow.

A torch is not functioning, though contact points in the torch are in working condition. What can be the possible reasons for this? Mention any three.

Complete the drawing shown in the figure to indicate where the free ends of the two wires should be joined to make the bulb glow.

Generic 2

5 x 2 = 10

Paheli has another arrangement of the cell and the bulb. Will the torch bulb glow in the following arrangement?

Mention what type of materials can be used in electric circuit so that the current can pass through them.

We should use plastic gloves for operating electrical devices. Explain why

State the purpose of using of an electrical switch

10.

Paheli wanted to glow a torch bulb using a cell. She could not get connecting wires instead she got two strips of aluminium foil. Will she succeed? Explain how.

Generic 5

3 x 5 = 15

11.

With the help of a labelled diagram, explain the structure and function of a torch?

12.

If we touch a base wire and we are in contact with earth, then we can get an electric shock and if we are standing above a plastic or drywood chair, then even on touching the base wire, we will not get any electric shock. Explain why.

13.

A torch requires 3 cells. Show the arrangement of the cells with a diagram inside the torch so that the bulb glows.

Multiple Choice Question

4 x 1 = 4

14.

Rubber is a

(a)

conductor

(b)

insulator

(c)

semiconductor

(d)

None of these

15.

Our body is

(a)

a bad conductor of electricity

(b)

sometimes a good conductor and sometimes a bad conductor

(c)

a good conductor of electricity

(d)

None of the above

16.

Filament of a torch bulb is

(a)

a metal case

(b)

metal tip at the centre of the base

(c)

two thick wires

(d)

a thin wire

17.

Lead of a pencil is

(a)

a insulator

(b)

a conductor

(c)

a semiconductor

(d)

None of these

True or False

2 x 1 = 2

18.

Air conducts electricity.

(a)

True

(b)

False

19.

A car battery contains many cells.

(a)

False

(b)

True

Fill up / 1 Marks

4 x 1 = 4

20.

Materials that allow the electricity to pass through them are called ___________________

21.

The electric cell and bulb have__________________ terminals.

22.

A device which makes or breaks the circuit is called _________________

23.

In bulb,_______________ glows.

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Answers Key:

Generic 3

5 x 3 = 15

The cell consists of a carbon rod present of the centre of the zinc container. By the side, metal cup present is positive terminal and opposite to that is a metal disc which is of negative terminal.

A device which is used to close or open a circuit is known as-switch, so when we open the switch, there exists an air gap which does not allow the current to pass through it. On the other hand, when it is closed, then there is not any existence of air gap between the wires and therefore in this way, it conducts electricity.

The complete circuit diagram so that-the bulb glows is given below

The possible reasons for not functioning of torch may be
(i) The torch bulb may be fused.
(ii) The cell may be discharged.
(iii) The connecting wires may be broken up

To complete the circuit, we must join the one end of the wire with the free end of cell. The other end of wire must be connected with the bulb. Now, the bulb will glow.

Generic 2

5 x 2 = 10

Since, the bulb is connected with the cell directly at one terminal and other terminal is connected with the negative of the cell with a wire. So, bulb will glow.

Materials used in the electric circuit should be good conductors of electricity that allow electricity to pass through them such as metals (aluminium, copper, iron, etc).

To avoid electric shocks, we should use plastic gloves for operating electrical devices.

In order to close or open the electrical circuit, the electric switch is used.

10.

Yes, she will succeed because aluminium is a conductor of electricity, it will complete the electrical circuit and bulb will glow.

Generic 5

3 x 5 = 15

11.

An electric torch is a device which is used as a lamp. It has two or more than two cells, a bulb and a switch.

So, when we slide the switch of electric torch, circuit becomes complete and bulb starts glowing, while on sliding switch back, circuit gets broken and bulb goes OFF.

12.

Current can only flow through a body if it gets the way to pass through it. In case of the earth, it gets the way from base wire to your body to the earth. In case of plastic chair or dry wood chair, it doesn't get the way to flow. So, you don't get any electric shock.

13.

The arrangement of bulb should be such that positive terminal of a battery touches the base of the bulb. When switch ON, bulb will glow.