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question_answer1)
Which symbol of the component is represented here?
A)
Switch in the ON position done
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B)
Switch in the OFF position done
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C)
Circuit breaker done
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D)
Battery done
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question_answer2)
The symbol of a cell is given as
. What does the shorter/thicker vertical line in the symbol of a cell represent?
A)
The positive terminal done
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B)
The negative terminal done
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C)
The direction of current done
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D)
All of the above done
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question_answer3)
Which appliance does not use an electromagnet?
A)
TV. done
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B)
Electric Bell done
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C)
Radio done
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D)
Electric Heater done
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question_answer4)
Which of the following is an electrical conductor?
A)
Silver done
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B)
Cork done
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C)
Silver-colored plastic done
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D)
Wood done
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question_answer5)
Which of the following materials allows electricity to pass through it?
A)
Conductor done
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B)
Insulator done
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C)
Rubber done
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D)
Glass done
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question_answer6)
Which of the following is an electrical insulator?
A)
Aluminium done
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B)
Gold done
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C)
Cork done
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D)
Copper done
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question_answer7)
Identify the element that is used for making the filament in bulbs.
A)
Tungsten done
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B)
Copper done
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C)
Aluminium done
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D)
Silver done
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question_answer8)
In which of the following circuits will the bulb or the bulbs glow the brightest?
A)
A simple circuit with one bulb and one cell done
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B)
A simple circuit with one bulb and two cells done
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C)
A simple circuit with two bulbs and one cell done
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D)
A simple circuit with two bulbs and two cells done
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question_answer9)
A Why is electrical wiring usually covered with a layer of plastic?
A)
To make it strong done
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B)
To allow electricity to flow in it done
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C)
To make it safe done
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D)
To make it beautiful done
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question_answer10)
Why does the bulb glow brighter when it is powered by two cells rather than one?
A)
The flow of electricity in the circuit is less. done
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B)
The flow of electricity in the circuit is the same. done
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C)
The flow of electricity in the circuit is greater. done
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D)
The flow of electricity fluctuates. done
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question_answer11)
Why do electricians wear rubber gloves?
A)
They are soft. done
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B)
They are water proof. done
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C)
They are insulators. done
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D)
They are inexpensive. done
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question_answer12)
What are the factors upon which the amount of heat produced in a wire depend?
(i) Material |
(ii) Length |
(iii) Thickness |
A)
Only (i) and (ii) done
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B)
Only (ii) and (iii) done
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C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
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question_answer13)
What happens when a bulb is powered by two cells instead of one in a circuit?
A)
The flow of electric current increases. done
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B)
The flow of electric current decreases. done
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C)
The flow of electric current remains constant. done
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D)
The brightness of bulb decreases by half. done
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question_answer14)
The bulb in the circuit shown below does not glow.
Which of following labelled parts is responsible for this?
A)
4 done
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B)
2 done
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C)
3 done
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D)
1 done
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question_answer15)
Pranati has set up a circuit as shown below.
Which of the following should she put in the blank box marked X to make the bulb glow more brightly?
A)
Bulb done
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B)
Cell done
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C)
Key done
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D)
Wire done
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question_answer16)
What happens if you place a compass near a current conducting wire?
A)
The needle in the compass gets deflected. done
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B)
The needle in the compass gets charged. done
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C)
The needle in the compass becomes hot. done
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D)
The needle in the compass glows brightly. done
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question_answer17)
Which of the following does NOT contain a heating element?
A)
Electric iron done
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B)
Electric heater done
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C)
Electric oven done
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D)
Electric bell done
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question_answer18)
Which of the following statements about an electromagnet is NOT true?
A)
Insulated wire is wound around it. done
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B)
It works only in the presence of electricity. done
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C)
It is used in fans and radio. done
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D)
It is a permanent magnet. done
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question_answer19)
Why is electrical wiring usually made of copper but not silver?
A)
Copper is a better conductor than silver. done
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B)
Copper is a better insulator than silver. done
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C)
Copper is less expensive than silver. done
clear
D)
Copper is non-magnetic than silver. done
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question_answer20)
Which of the following does NOT belong to the group formed by the others?
A)
Copper coin done
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B)
Steel spopn done
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C)
Wooden ruler done
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D)
Iron nail done
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question_answer21)
How are bulbs in our houses connected?
A)
In parallel done
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B)
In series done
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C)
Both in series and in parallel done
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D)
Same times in series and sometimes in parallel. done
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question_answer22)
Which of the following is NOT true about a series circuit?
A)
All the bulbs glow when the circuit is closed. done
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B)
If any one of the bulbs gets fused, then the other bulbs also stop glowing. done
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C)
The bulbs do not glow brightly. done
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D)
All the bulbs glow independently. done
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question_answer23)
Which of the following devices can be used to measure electric current in a circuit?
A)
Speedometer done
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B)
Ammeter done
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C)
Voltameter done
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D)
Battery done
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question_answer24)
Which of the following does NOT produce electrical energy?
A)
Generator done
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B)
Motor done
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C)
Battery done
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D)
Cell done
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question_answer25)
Which of the following electrical appliances does not have a heating element?
A)
Electric cooker done
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B)
Electric toaster done
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C)
Electric fan done
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D)
Soldering iron done
clear
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question_answer26)
X is a device which prevents damages to electrical circuits and possible fires. Identify X.
A)
Electromagnet done
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B)
Fuse done
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C)
Electric cell done
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D)
Tube light done
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question_answer27)
Which of the following effects of electric current is made use of in the figure shown below?
A)
Heating done
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B)
Magnetic done
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C)
Chemical done
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D)
All of the above done
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question_answer28)
Identify the substance that is easy to magnetize and demagnetize?
A)
Steel done
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B)
Cobalt done
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C)
Soft iron done
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D)
AInico done
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question_answer29)
Which of the following is the advantage of an accumulator over a dry cell?
A)
An accumulator is leak proof. done
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B)
An accumulator is cheap. done
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C)
An accumulator is rechargeable. done
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D)
An accumulator is portable. done
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question_answer30)
Which of the following statements is correct of a switch?
A)
It allows the flow of electricity. done
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B)
It controls the brightness of a bulb. done
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C)
It controls the power of the batteries. done
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D)
It fuses a bulb. done
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question_answer31)
Study the statements given below:
(i) Electromagnets can be made more powerful than ordinary bar magnets. |
(ii) Soft iron is easy to magnetize and |
(iii) The poles of an electromagnet are not affected by the direct on of the current. |
Which of the above statements about the electromagnets are correct?
A)
Only (i) and (ii) done
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B)
Only (ii) and (iii) done
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C)
Only (i) and (iii) done
clear
D)
(i), (ii) and (iii) done
clear
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question_answer32)
Which of the following objects make use of an electromagnet?
A)
B)
C)
D)
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question_answer33)
Which of these is the symbol for a series combination of cells?
A)
B)
C)
D)
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question_answer34)
Which of these is NOT an insulating material?
A)
Sawdust done
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B)
Wool done
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C)
Aluminium foil done
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D)
Glass done
clear
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question_answer35)
Which of the following effects of current in an electric bulb gives us light?
A)
Heating done
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B)
Magnetic done
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C)
Chemical done
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D)
All of the above done
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question_answer36)
What is an element7 in an electrical appliance essentially made up of?
A)
A coil of wire done
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B)
An electromagnet done
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C)
An insulating material done
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D)
A safety device such as a fuse done
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question_answer37)
Which of the following electrical appliances does NOT use the magnetic effects of current?
A)
B)
C)
D)
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question_answer38)
Identify the energy conversions in a closed, working circuit that enables continuous flow of current in it.
A)
Electrical to mechanical energy done
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B)
Electrical to chemical energy done
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C)
Mechanical to electrical energy done
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D)
Chemical to electrical energy done
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question_answer39)
Four cells are fixed on a board as shown below.
How will you connect the terminals with wires to make a battery of four cells?
A)
A-Q, C-D, D-P done
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B)
P-B, R-S, Q-C done
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C)
A-B, Q-R, C-S done
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D)
A-B, Q-R, C-D done
clear
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question_answer40)
Which of the following does NOT help us save electricity?
(i) Switch off the air conditioner and open the refrigerator door to cool the house. |
(ii) Use the electric iron to iron just one or two clothes at a time. |
(iii) Connect more than one electric appliance to one power point. |
A)
Only (i) and (ii) done
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B)
Only (ii) and (iii) done
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C)
Only (i) and (iii) done
clear
D)
(i),(ii) and (iii) done
clear
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