NCERT Class VI Science Solutions: Chapter 12-Electricity and Circuits Part 1

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Question 1:

Fill in the blanks:

  1. A device that is used to break an electric circuit is called _______________.

  2. An electric cell has _______________ terminals.

Answer:

  1. A device that is used to break an electric circuit is called switch.

  2. An electric cell has two terminals.

Question 2:

Mark 'True' or 'False' for following statements:

  1. Electric current can flow through metals.

  2. Instead of metal wires, a jute string can be used to make a circuit.

  3. Electric current can pass through a sheet of thermo Col.

Answer

  1. Electric current can flow through metals. (True)

  2. Instead of metal wires, a jute string can be used to make a circuit. (False)

  3. Electric current can pass through a sheet of thermo Col. (False)

Question 3:

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

Images for electrical close circuit

Electrical Close Circuit

Images for electrical close circuit

Answer:

The handle of screw is made up of insulator, which does allow to current to flow. That is why the bulb is not glowing.

Question 4:

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

Image the handle of screw is made up of insulator

The Handle of Screw is Made up of Insulator

Image the handle of screw is made up of insulator

Answer:

Images for the two wires should be joined to make the bulb

The Two Wires Should Be Joined to Make the Bulb

Images for the two wires should be joined to make the bulb

Question 5:

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

Answer:

A switch is a simple device that either breaks the circuit or completes it. The switches used in lighting of electric bulbs and other devices in homes work on the same principle. In radio, TV, mobiles, torch and electric toys have in built switches.

Question 6:

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

Images for a instead of safety pin we use an eraser.

A Instead of Safety Pin We Use an Eraser.

Images for a instead of safety pin we use an eraser.

Answer:

Eraser is insulator, so circuit will not complete. As a result the bulb will not glow.