 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 2023-24

### Class 10 Science Chapter 12 MCQ with Answers for 2023-24

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

#### 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
Q2

#### 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
Q3

#### The magnetic field lines produced by a bar magnet:

[A]. Originate from the south pole and end at its north pole
[B]. Originate from the north pole and end at its east pole
[C]. Originate from the north pole and end at its south pole
[D]. Originate from the south pole and end at its west pole
Q4

#### A D.C. generator is based on the principle of:

[A]. Electrochemical induction
[B]. Electromagnetic induction
[C]. Magnetic effect of current
[D]. Heating effect of current
Q5

#### Commercial electric motors do not use

[A]. An electromagnet to rotate the armature
[B]. Effectively large number of turns of conducting wire in the current carrying coil
[C]. A permanent magnet to rotate the armature
[D]. A soft iron core on which the coil is wound
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

#### 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.
Q8

#### 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
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

#### 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.
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

#### 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.
Q15

#### An electric generator converts:

[A]. Electrical energy into mechanical energy.
[B]. Mechanical energy into heat energy.
[C]. Electrical energy into chemical energy.
[D]. Mechanical energy into electrical energy.
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

#### 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.
Q18

#### 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.
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.

### 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