Class 7 Science Chapter 10 MCQ (Multiple Choice Questions) of Electric Current and Its Effect with answers and explanation for current academic session 2023-24. 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 10 MCQ for 2023-24

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

Consider the following statements and choose the correct one:

[A]. Electricity is a form of energy.
[B]. The flow of electricity through a conductor is called electric current.
[C]. Electricity is useful because it can run many appliances in our day-to-day life which make our work easier.
[D]. All the above
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

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.
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 a filament type bulb, a lot of electric energy is wasted in the form of:

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

The sound produced in a door bell is due to the:

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

The compact fluorescent electric lamp has:

[A]. Nichrome filament
[B]. Chromium filament
[C]. Tungsten filament
[D]. No filament
Q16

Electric current can produce effects

[A]. Heating effect
[B]. Magnetic effect
[C]. Chemical effect
[D]. All the above
Q17

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.
Q18

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
Q19

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

[A]. A fuse works on the heating effect of current.
[B]. A fuse consists of a short length of a thin, tin-plated copper wire having low melting point.
[C]. A fuse is a safety device which prevents electric fires and damage to electrical appliances due to excessive flow of current.
[D]. None of the above
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

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.
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

Shreya is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. Electromagnets are used in the construction of a large number of devices like electric bells, loudspeakers, electric motors etc.
[B]. The electromagnets which are used for loading and unloading heavy iron and steel objects are fitted on cranes.
[C]. Electromagnets are used by doctors to remove tiny iron particles from the eyes of a person (which may have fallen into the eyes accidentally).
[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

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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Last Edited: June 13, 2023