Emerald Valley Public Schol, Salem.
Physical Science
Class: VI
Name: ………………... Electricity and its circuits-Worksheet Sec: …..
Date: ……
1 For the questions that follow, two statements are given: -
one labelled Assertion (A) and the other labelled Reason (R).
Select the correct answer to these questions from the codes
(i), (ii), (iii) and (iv) as given below:
i) Both A and R are true and R is the correct explanation of the
assertion.
ii) Both A and R are true but R is not the correct explanation of the
assertion.
iii) A is true but R is false.
iv) A is false but R is true
a. Assertion (A): Connecting wire is used to connect all components of
electric circuit.
Reason (R): Connecting wire is made of electric conductor.
b. Assertion (A): A dry cell is very heavy and big.
Reason (R): A dry cell converts chemical energy to electrical energy.
c. Assertion (A): Air is considered as a good insulator.
Reason(R): Those materials that do not allow electric current
to pass through them are called insulators.
2 Statement-1: There is very less current flows when an electric circuit is open.
Statement-2: When the switch of an electric circuit is in off mode, the circuit is said
to be open.
Statement-3: One can get a shock in open circuit.
Which of these statements is(are) incorrect? Rewrite the incorrect them.
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3 Which of the following explains why a battery needs to be replaced after it has been
used for a while?
a. It becomes very hot, and may give a b. It becomes very light, and cannot
shock. conduct electricity
c. The chemicals in it get used up, so it d. The electricity stored inside it gets
cannot produce electricity. used up, so it cannot provide
electricity.
4 A switch is something that is used in a circuit to allow the flow of current by
completing the circuit or to stop the flow of current by creating a gap in it.
Which of the following is an ESSENTIAL characteristic of the switch in order to
allow the electricity to flow through the circuit?
a. It must be made only of metal b. It must be made only of plastic.
c. It can be made of any material, but d. It can be made of any material, but
must be flexible like a wire. must be a good conductor of electricity.
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5 Rajni made an electric circuit as shown in figure 1.
The bulb glowed when the switch was ON.
Then she changed the circuit arrangement in different ways.
a. In which of the circuits will the bulb glow? (Assume that all the switches were
ON.)
b. In which of the circuits the bulb will not glow?
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6 Shown here is an electric bulb connected in a circuit.
If the filament breaks suddenly while the lamp is ON, the electric current that is
flowing through the circuit will
a. a. continue to flow from both the terminals up to the two ends of the broken
filament
b. b. continue to flow from the negative terminal up to the broken end of the filament
c. c. stop flowing after the broken filament cools and becomes dark
d. d. stop flowing the moment the filament in the bulb breaks
7 Which of these BEST defines an electrical insulator?
a. a material that does not permit the free passage of electricity
b. a material that permits the free passage of electricity
c. a material that permits the passage of electricity only at low temperatures
d. a material that permits the passage of electricity only at room temperature
8 A fused bulb does not glow. Why?
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9 Draw the symbols for components of an electric circuit:
a) cell b) battery of two cells c) bulb
d) closed switch e) wire f) ammeter
a. b. c.
d. e. f.
10 A torch is a portable electric lamp which uses two or more cells to light a small
bulb. Electricity to the bulb in a torch is provided by the electric cell. An
electric cell is a source of electricity that converts chemical energy into
electrical energy. Electric cells have a small metal cap on one side and a metal
disc on the other side. All electric cells have two terminals – a positive terminal
and a negative terminal. The direction of the current is taken to be from the
positive terminal to the negative terminal of the electric cell. An electric cell
produces electricity from the chemicals stored in it. When the chemicals in the
electric cell are used up, the cell stops producing electricity. The electric cell
then has to be replaced with a new one. The switch slides between the ON and
OFF positions. The bulb glows in the ON position and stops glowing in the
OFF position.
a. What is an electric cell?
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b. What is the direction of the electric current in a circuit?
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c. What happens to electric cells when the chemicals are used up?
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11 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.
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12 Why does a cell stop producing electricity after sometime?
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13 You are given a single piece of electric wire Can you make the bulb glow
without cutting the wire? How? Support your answer the diagram
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14 Why do bulbs have two terminals?
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15 Which of the following arrangements A, B, C and D given below should not be set
up? Explain, why.
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16 Match the column
17 When the chemicals in the electric cell are used up, the electric cell stops
producing electricity. The electric cell is then replaced with a new one. In
case of rechargeable batteries (such as the type used in mobile phones,
camera and inverters), they are used again and again. How?
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