Class 7 Science Chapter 14 MCQ (Multiple Choice Questions) of Electric Current and Its Effect with answers and explanation for current academic session 2022-2023. 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 2022-2023

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

At the time of short circuit, the current in the circuit:

[A]. Reduce substantially
[B]. Does not change
[C]. Increase heavily
[D]. Varies continuously
Q2

The filament of an electric bulb is made of a thin wire of:

[A]. Copper
[B]. Aluminium
[C]. Nichrome
[D]. Tungsten
Q3

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
Q4

The element of an electric iron is made of:

[A]. Iron
[B]. Nickel
[C]. Nichrome
[D]. Tungsten
Q5

When electric current is passed through the filament of a bulb, it gives off:

[A]. Sound and heat
[B]. Heat and magnetism
[C]. Heat and light
[D]. Light
Q6

In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. A cell having a positive terminal and negative terminal.
[B]. If we open the switch, so that it comes in the off position, then a gap is created between the two end of the copper wire or connecting wires.
[C]. When the switch in the circuit is closed, then the switch is said to be in the on position.
[D]. None of the above
Q7

Which of the following statement is or are incorrect?

[A]. When the switch in the circuit is open, then the switch is said to be in the off-position.
[B]. Sometimes the bulb does not light up or glow even when the switch is in the on position or closed.
[C]. The positive terminal of one cell is joined to the negative terminal of the other cell.
[D]. The symbol for representing a battery for three cells will have four pairs of long and short parallel lines connected to one another.
Q8

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.
Q9

Nichrome wire is used in:

[A]. CFL
[B]. Electric fuse
[C]. Hair dryer
[D]. MCB
Q10

Choose the statement which is not correct in the case of an electric fuse:

[A]. Fuses are inserted in electric circuits of all buildings.
[B]. There is a maximum limit on the current which can safely flow through the electric circuits.
[C]. There is a minimum limit on the current which can safely flow in the electric circuits.
[D]. If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.
Q11

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were correct? Will you be able to answer this question?

[A]. We use a thin wire in a fuse because it has a much greater resistance than the rest of connecting wires.
[B]. When a fuse gets blown or breaks a new fuse has to be fitted in its place to restore the electricity supply in the household circuit.
[C]. We should not use a thick wire as a fuse wire because it will have a low resistance and then it will not get heated to its melting point easily.
[D]. All the above.
Q12

Which of the following characteristic is not suitable for a fuse wire?

[A]. Thin and short
[B]. Thick and short
[C]. Low melting point
[D]. Higher resistance than rest of wiring
Q13

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
Q14

The magnetic effect of electric current was discovered by:

[A]. Maxwell
[B]. Darwin
[C]. Oersted
[D]. Newton
Q15

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
Q16

A fuse wire is made of:

[A]. Cu and Pb
[B]. Pb and Sn
[C]. Al and Sn
[D]. Pb and Al
Q17

Electric current can produce effects

[A]. Heating effect
[B]. Magnetic effect
[C]. Chemical effect
[D]. All the above
Q18

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

[A]. The fluorescent tube lights and compact fluorescent lamps do not have filaments.
[B]. Fluorescent tube lights and compact fluorescent lamps do not work on the heating effect of current.
[C]. The fluorescent tube light on lamp contains mercury vapor, which is a kind of gas.
[D]. The fluorescent tube light on lamp contains silver gas, due to these, they are more expensive.
Q19

Due to this, the filament of electric bulb gets heated to a very high temperature and starts glowing:

[A]. Light
[B]. Magnetic field
[C]. Resistance
[D]. Nichrome wire
Q20

Choose the combination of correct answer from the following:

[A]. Circuit is open and no current flows through it .
[B]. Current flows after sometime.
[C]. Circuit starting from positive terminal of the cell stops at the switch and circuit is open.
[D]. All are correct
Q21

Tanupriya is writing some statements, choose the incorrect statement and help her:

[A]. MCB stand for miniature circuit breaker.
[B]. MCB works on the magnetic effect of current.
[C]. MCB does not work on the heating effect of current.
[D]. None of the above
Q22

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

[A]. An electromagnet works on the magnetic effect of current.
[B]. Only iron is used for making electromagnets.
[C]. The magnetism of an electromagnet remains as long as the current is flowing in its coil.
[D]. The steel is also used for making electromagnets.
Q23

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
Q24

Vishvas is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

[A]. The electric bell works on the heating and magnetic effect of current.
[B]. The electric bell has a U-shaped electromagnet.
[C]. The electric bell uses an electromagnet to pull that clapper on to a metal bell called gong.
[D]. None of the above
Q25

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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