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

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

[A]. Copper
[B]. Aluminium
[C]. Nichrome
[D]. Tungsten
Q2

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
Q3

The element of an electric iron is made of:

[A]. Iron
[B]. Nickel
[C]. Nichrome
[D]. Tungsten
Q4

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.
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

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
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

Circuit Breaker Device which can be used in place of fuse in domestic electric wiring is called:

[A]. CBD
[B]. DCB
[C]. MCD
[D]. MCB
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 a filament type bulb, a lot of electric energy is wasted in the form of:

[A]. Magnetism
[B]. Sound
[C]. Light
[D]. Heat
Q12

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
Q13

The magnetic effect of electric current was discovered by:

[A]. Maxwell
[B]. Darwin
[C]. Oersted
[D]. Newton
Q14

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
Q15

The compact fluorescent electric lamp has:

[A]. Nichrome filament
[B]. Chromium filament
[C]. Tungsten filament
[D]. No filament
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

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
Q19

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.
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

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
Q23

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
Q24

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
Q25

Which of the following precautions need not to be taken while using electric gadgets or appliances or circuit?

[A]. We should never touch a lighted electric bulb connected to the mains.
[B]. We should never do experiment with the electric Supply from the mains or a generator or an inverter.
[C]. We should never use just any wire or strip of metal in place of a fuse.
[D]. We should never turn the switch in ON position.

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