Updated by Tiwari Academy
on June 13, 2023, 11:14 AM
on June 13, 2023, 11:14 AM
Class 7 Science Chapter 10 MCQ (Multiple Choice Questions) of Electric Current and Its Effect with answers and explanation for current academic session 2024-25. 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 2024-25
| Class: 7 | Science |
| Chapter: 14 | Electric 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
The filament of an electric bulb is made of a thin wire of:
[A]. Copper
[B]. Aluminium
[C]. Nichrome
[D]. Tungsten
Q4
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
Q5
Read the following sentences carefully, and choose the incorrect one:
[A]. Electric current is actually a flow of charged particles called electrons in a conductor.
[B]. A cell or battery is a source of electric current but this current not flow out on its own.
[C]. A continuous conducting path between the two terminals of a cell of battery along which an electric current flow, is called a circuit.
[D]. None of the above
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
The most suitable material for making the core of an “Electromagnet” is:
[A]. Iron
[B]. Brass
[C]. Aluminium
[D]. Steel
Q8
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.
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
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.
Q13
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
Q14
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
Q15
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
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
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
Which of the following statement is or are incorrect?
[A]. The magnetic effect of current was discovered by scientist named Hans Christian Oersted.
[B]. When electric current passes through a wire, the current-carrying wire behaves like a magnet.
[C]. It is this magnetic field produced by the current carrying wire which exerts of force on the compass needle and deflects it.
[D]. None of the above
Q23
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.
Q24
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
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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Last Edited: June 13, 2023
