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DAV Class- 6 Electric Currents and Circuits Question and Answer
Something To Know
A. Fill in the blanks.
1. The thin coiled wire, that gives light, when heated up, is known as the filament of an electric bulb.
2. An electrical device needs at least two terminals.
3. An electric bulb glows when a current flows through it.
4. The device, that is used to ‘break’ or ‘make’ an electric circuit, is called an electric switch.
5. The materials, which (easily) let electricity flow through them, are called conductors.
6. Electric current does not pass through a sheet of plastic.
B. Write True or False for the following statements.
| Question | True/False |
| 1. A dry cell stops working when the chemicals in it get used up. | True |
| 2. Electric current is taken to flow from the negative terminal of the (electric) cell to the positive terminal of the cell. | False |
| 3. We need to complete the relevant electric circuit to enable an electric device to work. | True |
| 4. Button cells are used in wrist watches. | True |
| 5. We can use a polyster thread, in place of metal wires, to complete an electrical circuit. | False |
C. Tick the correct option.
1. The thin metal wire inside an electric bulb, is known as-
Answer 1: filament
2. When an electric current starts flowing in an electric bulb, it starts emitting light because its—
Answer 2: filament gets heated up and then starts emitting light.
3. The basic electric circuit needs to have—
Answer 3: a source of electric current, a few conducting wires as well as an electric switch.
4. The electric bulb, in the circuit shown here, would glow when—
Answer 4: both switches 1 and 2 are in their ‘ON’ positions.
5. The relevant examples (2 each) have been correctly tabulated only in table—
Answer 5: Option b.
D. Answer the following questions in brief.
1. State the function of the metallic strips used in a torch?
Answer 1: Metallic strips act as the conducting wires through which electricity flows when the switch is in the ‘ON’ position.
2. The given diagram shows a dry cell with its different parts marked as 1, 2, 3, 4 and 5. Which of them are the ‘two terminals’ of the dry cell?
Answer 2: The two terminals are:
- 1-metal cap (positive)
- 5-Zinc case (negative)
3. Write the meaning of the term ‘electric circuit’?
Answer 3: A complete and closed path through which an electric current can flow is known as an electric circuit.
4. State the role of an electric switch in an electric circuit.
Answer 4: Electric switch helps us to start and stop the flow of current as and when required.
5. Tools, like screw drivers and pliers, used by electricians, have handles made up of, (or covered with) plastic, rubber or wood. Why?
Answer 5: Plastic, rubber or wood are good insulators and do not allow electricity to pass through them and thus prevent electricians from electric shock.
6. Why should we always dry our hands before touching an electric appliance, or a switch?
Answer 6: We should always dry our hands before touching an electrical appliance or a switch because ordinary water is a reasonably good conductor of electricity and thus, we may get an electric shock leading to serious injuries.
E. Answer the following questions.
1. Write in brief, the working of an electric torch.
Answer 1: Electricity begins to flow from the electric cells to the electric bulb when we slide/press the switch on an electric torch. The filament of the bulb is heated by the flow of electric current. As a result, the bulb turns on.
2. A student, while performing an experiment in the science laboratory, connected an electric bulb to an electric cell through an electric switch. He noticed that the bulb did not glow when the electric switch was set in its ON position. Mention ‘any two reasons for this observation.
Answer 2: Two possible reasons for this observation are: –
1. Connections may be loose or unclear.
2. Cell may not be working. Or The bulb may be fused.
3. Separate out the devices, listed below, into categories that usually work with (i) either batteries or mains (ii) batteries only (iii) mains only.
kettle, iron press, calculator, toaster, mobile phone, washing machine, radio, transistor, computer, microwave oven.
Answer 3: Either batteries or mains: Computer
Batteries only: Calculator, mobile phone, radio, transistor
Mains only: Kettle, iron press, toaster, Microwave oven, washing machine.
4. Match the labels to the correct parts of the circuit given below.
Will this circuit work? Justify your answer.
Answer 4: No, this circuit will not work as the switch is in its off position.
5. Distinguish between the term’s conductors and insulators of electricity. Give two examples of each type.
Answer 5:
Conductors: Materials, which allow electricity to pass through them easily, are called conductors.
Examples – silver, copper.
Insulators: Materials, which do not allow electricity to pass through them, are called Insulators.
Examples-rubber, wood.
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