Updated on April 27, 2023
by Tiwari Academy
by Tiwari Academy
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: 10 | Science |
| Chapter: 12 | Magnetic Effects of Electric Current |
| Contents: | MCQ Online Tests with Answers |
| Session: | CBSE 2025-26 |
Class 10 Science Chapter 12 MCQ with Answers for 2025-26
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.
Q1
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
Q2
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
Q3
To convert an AC generator into DC generator
[A]. Split-ring type commutator must be used
[B]. Slip rings and brushes must be used
[C]. A stronger magnetic field has to be used
[D]. A rectangular wire loop has to be used
Q4
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
Q5
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
Q6
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.
Q7
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
Q8
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.
Q9
Consider the following statements and choose the incorrect one:
[A]. Iron feelings show the shape of magnetic field produced by a bar magnet by aligning themselves with the magnetic field lines.
[B]. A compass consists of a tiny pivoted magnet usually in the form of a pointer which can turn freely in the horizontal plane.
[C]. A compass needle do not deflected when brought near a bar magnet.
[D]. The strength of magnet field is indicated by the degree of closeness of the field lines.
Q10
The phenomenon of electromagnetic induction is:
[A]. The process of charging a body.
[B]. The process of generating magnetic field due to a current passing through a coil.
[C]. Producing induced current in a coil due to relative motion between a magnet and the coil.
[D]. The process of rotating a coil of an electric motor.
Q11
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.
Q12
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
Q13
Read the following sentences carefully, and choose the correct one:
[A]. If the direction of current in the front face of a circular wire is clockwise then the direction of current in the back face of the circular wire will be anticlockwise.
[B]. The solenoid is a long coil containing a large number of close turns of insulated copper wire.
[C]. The magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a bar magnet.
[D]. All the above.
Q14
The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was:
[A]. Moving towards the solenoid
[B]. Moving into solenoid
[C]. At rest inside the solenoid
[D]. Moving out of the solenoid
Q15
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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Q16
In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?
[A]. An electromagnet is a magnet consisting of a long coil of insulated copper wire wrapped around a soft iron core that is magnetized only when electric current is passed through the coil.
[B]. The core of an electromagnet must be soft iron because soft iron losses all of its magnetism when current in the coil is switched off.
[C]. If steel is used for making the core of an electromagnet, the steel does not lost all its magnetism when the current is stopped and it becomes a permanent magnet.
[D]. None of the above.
Q17
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
Q18
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.
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 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
Q20
A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle to be used on a 250 V a.c. supply. Which of the following statements is not correct?
[A]. The fuse should be fitted in the live wire
[B]. A 13 A fuse is the most appropriate value to use
[C]. The neutral wire is coloured black
[D]. The green wire should be connected to the earth pin.
Q21
Read the following sentences carefully, and choose the correct one:
[A]. The direction of induced current can also be reversed by reversing the direction of magnetic field.
[B]. A generator uses the movement or rotation of a rectangular coil of wire between the poles of a horseshoe magnet to produce an electric current.
[C]. If a wire (in the form of a coil) is kept fixed, but a magnet is moved inside it, even then a current is produced in the coil of wire.
[D]. All the above.
Q22
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.
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]. 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.
Q24
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
Q25
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.
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
