Introduction
Before trying to attempt to answer the NCERT exercise questions, you should have a thorough understanding of class 6 Science chapter 9 i.e. ‘’Electricity and Circuits‘.
If you haven’t understood the chapter yet, then worry not you can go through it easily and develop a crystal clear understanding of various concepts from our notes whose link has been provided below.
NCERT Exercise Questions & Answers
Que. 1 Fill in the blanks :
(a) A device that is used to break an electric circuit is called ______.
(b) An electric cell has _____ terminals.
Ans. 1 (a) A device that is used to break an electric circuit is called a switch.
(b) An electric cell has two terminals.
Que. 2 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 thermo Col.
Ans. 2 (a) Electric current can flow through metals. (True)
(b) Instead of metal wires, a jute string can be used to make a circuit. (False)
(c) Electric current can pass through a sheet of thermo col. (False)
Que. 3 Explain why the bulb would not glow in the arrangement shown in Fig. 9.13.
Ans. 3 The bulb will not glow in this arrangement because in the middle of the circuit, there is a screwdriver present and while the tip of the screwdriver is made up of a conducting material its body is actually made up of insulating material like plastic that is breaking up the circuit not letting the electric current flow to the electric bulb.
Que. 4 Complete the drawing shown in Fig. 9.14 to indicate where the free ends of the two wires
should be joined to make the bulb glow.
Ans. 4 One of the free end of the wires will be joined with the positive terminal of the bulb and the other free end of the wire will be joined with the positive terminal of the cell.
Que. 5 What is the purpose of using an electric switch? Name some electrical gadgets that have switches
built into them.
Ans. 5 The main purpose of an electric switch is to voluntarily complete or break an electric circuit without the need to remove or touch the electrical wires of the circuit.
Some of the electrical gadgets that have switches built into them are refrigerators, electric torches, washing machines, electric stoves, electric kettles, etc.
Que. 6 Would the bulb glow after completing the circuit shown in Fig. 9.14 if instead of a safety pin we
use an eraser?
Ans. 6 No, the bulb will not glow even after completing the circuit with an eraser instead of a safety pin because an eraser is made up of rubber and rubber is an electric insulator that will not allow the electric current to pass through itself hence the circuit will remain broke.
Que. 7 Would the bulb glow in the circuit shown in Fig. 9.15?
Ans. 7 No, the electric bulb will not glow in the circuit shown in Fig. 9.15 because both terminals of an electric cell are connected with only the negative terminal of an electric bulb leaving the positive terminal of the bulb unconnected.
Que. 8 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.
Ans. 8 The object that was used in a “conduction tester” is a conductor because only a conductor will allow the current to pass through itself. Hence, completing the electric circuit leads to the lighting up of the electric bulb.
Que. 9 Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.
Ans. 9 An electrician should wear rubber gloves while repairing an electric switch to protect himself/herself from accidentally touching any live electric wire that can cause harm to the human body. The human body is a good conductor of electricity and it can give us severe electric shocks, burns and sometimes it can cause our death as well. So, it is necessary to wear plastic gloves to create a layer of insulation between the human body and the electricity.
Que. 10 The handles of tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?
Ans. 10 The handles of tools like screwdrivers and pliers used by electricians usually have plastic or a rubber cover on them to protect the electrician from directly touching the live electric wires while doing the repair work. As rubber and plastics are insulators, they don’t let the electric current pass through the screwdrivers and pliers, hence protecting the electrician.
References & Credits
- Class 6 Science NCERT Textbook
- Image by Colin Behrens from Pixabay
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