Class 7 Science Chapter 14 MCQ

Class 7 Science Chapter 14 MCQ (Multiple Choice Questions) of Electric Current and Its Effect with answers and explanation for current academic session 2021-2022. All the questions are important for exams.

In all subjects MCQs are asked in question papers. All the topics are covered in the form of objective MCQs with answer and explanation. Students are required to study the chapter and go through these objective MCQ tests to be confident in exams.

Class 7 Science Chapter 14 MCQ for 2021-2022

Class: 7Science
Chapter: 14Electric Current and Its Effect
Contents:MCQ Onlne Test with Answers

MCQ Tests with Answers for Class 7 Science Chapter 14

Q1

Read the following sentences carefully, and choose the incorrect one:

[A]. Electricity is produced at power stations.
[B]. From the power stations, electricity is brought to our homes through thick wires atop tall electric poles.
[C]. Though electricity is very useful but it can also be very dangerous.
[D]. None of the above
Q2

Arjun appeared in class test but he confused to know the incorrect statement. Would you help him to know that?

[A]. Improper handling of electricity can cause fires.
[B]. The electricity produced by portable electric generators and inverters is equally dangerous.
[C]. We can use electric cell to obtain electricity that is safe for performing science experiments.
[D]. Portable generators as well as inverters has very low voltage of 110 volts.
Q3

An electric fuse works on the:

[A]. Chemical effect of current
[B]. Magnetic effect of current
[C]. Lighting effect of current
[D]. Heating effect of current
Q4

Start to your left side, three bulbs A, B, C are connected in a circuit with the help of wire, switch and three cells. There are no defected pieces of anything. If switch is ON position:

[A]. Bulb C will glow first.
[B]. Bulb B and C will glow simultaneously and bulb A will glow after sometime.
[C]. All the bulbs A, B and C will glow at the same time.
[D]. The bulbs will glow in order A, B and C.




Q5

An MCB which cuts off the electricity supply in domestic circuit in case of short circuiting and overloading works on the:

[A]. Chemical effect of current
[B]. Heating effect of current
[C]. Magnetic effect of current
[D]. Lighting effect of current
Q6

Which of the following does not work on the heating effect of current?

[A]. Electric bulb
[B]. Miniature circuit breaker
[C]. Electric fuse
[D]. Immersion rod



Q7

In a science quiz competition, Ankital are asked a question where she had to choose the statement which was/were incorrect?

[A]. A group of cells joined in series is called a battery.
[B]. When the positive terminal of one cell is joined with the negative terminal of the other cell, then the cells are said to be joined in series.
[C]. A diagram which tells us how the various components in a circuit have been connected by using the electrical symbols of the components, is called a circuit diagram.
[D]. None of the above
Q8

Which of the following statement is or are correct?

[A]. The touching of live-wire and neutral wire directly is known as short circuit.
[B]. When a short circuit or overloading occurs, the fuse wire blows out cutting off the electricity supply.
[C]. The flow of excessive current and torn wire in the household circuit is the other reason for the short circuit.
[D]. All the above.




Q9

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

[A]. An electromagnet is better than a permanent magnet in many respects.
[B]. An electromagnet is a temporary magnet because its magnetism is only for the duration of current flowing in its coil.
[C]. An electromagnet can be made very strong by increasing the number of turns in the coil and by increasing the current passing through the coil.
[D]. All the above
Q10

Consider the following statements and choose the incorrect one(s):

[A]. The electromagnet loses its magnetism for a moment and the armature is no longer attracted by it.
[B]. After getting magnetized the electromagnet attracts the iron armature towards itself.
[C]. When we press the switch, the electric circuit of the bell is completed and the current passes through the coil of the electromagnet and it gets magnetized.
[D]. None of the above

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