Class 10 Science Chapter 12 MCQ (Multiple Choice Questions) of Magnetic Effects of Electric Current. All MCQs are important for exams as well as school tests. Practice with these objective questions to score more in your terminal exams or unit tests. These MCQs includes almost all questions from intext questions and exercises questions. Answers and explanation of each MCQ is given along with the questions.

Class 10 Science Chapter 12 MCQ Online Test

Class: 10Science
Chapter: 12Magnetic Effects of Electric Current
Contents:MCQ Online Tests with Answers
Session:CBSE 2023-24

Class 10 Science Chapter 12 MCQ with Answers for 2023-2024

Class 10 Science Chapter 12 MCQ Online Test with answers are given here to provide a perfect practice to the all students of grade 10. All the answers are taken from NCERT Books for class 10 science only. There are about 75 questions divided in sets of questions. If a user need more practice, click on the button “Start a New Test” given at the end of last question.


The most important safety method used for protecting home appliances from short circuiting or overloading is

[A]. Earthing
[B]. Use of fuse
[C]. Use of stabilizers
[D]. Use of electric meter

A strong bar magnet is placed vertically above a horizontal wooden board. The magnetic lines of force will be:

[A]. Only in horizontal plane around the magnet
[B]. Only in vertical plane around the magnet
[C]. In horizontal as well as in vertical planes around the magnet
[D]. In all the planes around the magnet

The strength of magnetic field inside a long current carrying straight solenoid is

[A]. More at the ends than at the center
[B]. Minimum in the middle
[C]. Same at all points
[D]. Found to increase from one end to the other

The magnetic field lines:

[A]. Intersect at right angles to one another
[B]. Interest at an angle 45° to each another
[C]. Do not cross one another
[D]. Cross at an angle of 60° to one another

A plotting compass is placed near the south pole of a bar magnet. The pointer of plotting compass will:

[A]. Point away from the south pole
[B]. Point parallel to the south pole
[C]. Point towards the south pole
[D]. Point at right angles to the south pole

Which of the following statements is incorrect regarding magnetic field lines?

[A]. The direction of magnetic field at a point is taken to be the direction in which the north pole a magnetic compass needle points.
[B]. Magnetic field lines are closed curves.
[C]. If magnetic field lines are parallel and equidistant, they represent zero field strength.
[D]. Relative strength of magnetic field is shown by the degree of closeness of the field lines.

The strength of the magnetic field between the poles of an electromagnet would be unchanged if:

[A]. Current in the electromagnet winding were doubled
[B]. Direction of current in electromagnet winding were reversed
[C]. Distance between the poles of electromagnet were doubled
[D]. Material of the core of electromagnet were changed

Consider the following statements and choose the correct one:

[A]. A magnet is an object which attracts piece of iron steel Nickel and Cobalt.
[B]. Magnetic effect of electric current means that an electric current flowing in a wire produces a magnetic field around it.
[C]. The end of a a freely suspended magnet which points towards the north direction is called the north pole of the magnet
[D]. All the above

Which of the following correctly describes the magnetic field near a long straight wire?

[A]. The field consists of straight lines perpendicular to the wire.
[B]. The field consists of straight lines parallel to the wire.
[C]. The field consists of radial lines originating from the wire.
[D]. The field consists of concentric circles centred on the wire.

Which of the following statement is or are correct?

[A]. The space surrounding a magnet in which magnetic force is exerted is called a magnetic field
[B]. The direction of magnetic field at a point is the direction of the resultant force acting on a hypothetical north pole place at that point
[C]. The magnetic field lines always begin from the N-pole of a magnet and end on the S-pole of the magnet.
[D]. All the above

Rahul is writing the properties of the magnetic field lines choose the correct statements:

[A]. The magnetic field lines originate from the north pole of a magnet and end at its south pole.
[B]. The magnetic field lines come closer to one another near the poles of a magnet but they are widely separated at other places.
[C]. The magnetic field lines do not intersect or crossed one another
[D]. All the above.

The essential difference between an AC generator and a DC generator is that:

[A]. A.C. generator has an electromagnet while a DC generator has permanent magnet.
[B]. D.C. generator will generate a higher voltage.
[C]. A.C. generator will generate a higher voltage.
[D]. A.C. generator has slip rings while the DC generator has a commutator.

Neeru is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Neeru wants to take help from you:

[A]. A concealed current carrying conductor can be located due to the magnetic effect of current by using a plotting compass.
[B]. The magnetic field lines around a straight conductor or straight wire carrying current are concentric circles whose centres lies on the wire.
[C]. The magnitude of magnetic field produced by a straight current carrying wire at a given point is inversely proportional to the distance of that point from the wire.
[D]. When electric current flows vertically downwards then the direction of magnetic field is anticlockwise.

Each one of the following changes will increase emf (or voltage) in a simple generator except:

[A]. Increasing the number of turns in the armature coil
[B]. Winding the coil on a soft iron armature
[C]. Increasing the size of the gap in which the armature turns
[D]. Increasing the speed of rotation

Ruchika is writing about the factors affecting the strength of an electromagnet. Choose the incorrect statements:

[A]. If we increase the number of turns in the coil, the strength of electromagnet increases.
[B]. If the current in the coil is increased, the strength of electromagnet increases.
[C]. If we reduce the length of air gap between the poles of an electromagnet, then its strength increases
[D]. The strength of an electromagnet cannot be changed by changing the numbers of turns in its coil.

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An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:

[A]. The speed with which the magnet is moved
[B]. The number of turns of the coil
[C]. The resistivity of the wire of the coil
[D]. The strength of the magnet

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

[A]. Extremely weak electric currents are produced in the human body by the movement of charged particles called ions.
[B]. The two main organs of the human body where the magnetic field produced is quite significant are the heart and the brain.
[C]. The magnetism produced inside the human body from the basis of the technique called Magnetic Resonance Imaging.
[D]. All the above.

Which one of the following statements is not true?

[A]. In a house circuit, lamps are used in parallel.
[B]. Switches, fuses and circuit breakers should be placed in the neutral wire
[C]. An electric iron has its earth wire connected to the metal case to prevent the user receiving a shock
[D]. When connecting a three-core cable to a 13 A three-pin plug, the red wire goes to the live pin.

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]. A magnet exerts a mechanical force on a current carrying wire, and if the wire is free to move, this force can produce a motion in the wire.
[B]. When current carrying conductor is placed in a magnetic field, a mechanical force is exerted on the conductor which can make the conductor move.
[C]. The direction of force acting on a current carrying wire placed in a magnetic field is perpendicular to the direction of current.
[D]. All the above.

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 minimum force is exerted on a current carrying conductor only when it is perpendicular to the direction of magnetic field.
[B]. The direction of force on a current carrying conductor placed in a magnetic field can also be reversed by reversing the direction of magnetic field.
[C]. No force acts on a current carrying conductor when it is parallel to the magnetic field.
[D]. None of the above

Which of the following statement is or are correct?

[A]. A motor is a device which converts electrical energy to mechanical energy. [B] [C] [D]
[B]. A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it a force exerted on the coil which rotates it continuously.
[C]. Commutator rings reverse the direction of current flowing through the coil after every half rotation of the coil.
[D]. All the above.

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

[A]. The electric generator converts mechanical energy into electrical energy.
[B]. The alternating current AC produced in India has a frequency of 50 Hertz.
[C]. The electric generator works on the principle that when a straight conductor is moved in a magnetic field, then current is induced in the conductor.
[D]. All the above.

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

[A]. If we replace the slip rings on an AC generator by a commutator, then it will become a DC generator.
[B]. The only difference between a DC generator and AC generator is in the way the two ends of the generator coil are linked to the outer circuit.
[C]. The power house AC generators have a fixed set of coils arranged around a rotating electromagnet.
[D]. None of the above.

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

[A]. All the electrical appliances like bulbs, fans and sockets etc. are connected in parallel across the live wire and the neutral wire.
[B]. There are two separate circuits in a house, the lightning circuit with a 15 A fuse and the power circuit with a 25 A fuse.
[C]. The main advantage of the parallel connection is that if one of the appliances is switched off, or gets fused, there is no effect on the other appliances and they keep on operating.
[D]. Another advantage of the parallel circuits is that the same voltage of the mains line is available for all the electrical appliances

Priya is writing some statements, choose the incorrect statement and help him:

[A]. To avoid the risk of electric shocks, the metal body of an electrical appliance is “earthed”.
[B]. Touching of the live wire and neutral wire directly is known as short circuit.
[C]. The red colored wire is the live wire, and the black wire is the earth wire, whereas green wire is the neutral wire.
[D]. An extremely large current can flow in domestic wiring under two circumstances i.e., short circuiting and overloading.

Who did show that electricity and magnetism are related to each other as in 10th Science?

It was first shown by Oersted that electricity and magnetism were related phenomena.

What is magnetic field according to Class 10 Science chapter 12?

The region surrounding a magnet, in which the force of the magnet can be detected, is called magnetic field of the magnet.

Why do two magnetic field line not intersect explain as in 10th Science NCERT?

No two field-lines are found to cross each other. If they did, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible.

State the Fleming’s left-hand rule according to 10th Science Chapter 12?

According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.

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Last Edited: April 27, 2023