Class 10 Science Chapter 13 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 13 MCQ Online Test for 2022-2023

 Class: 10 Science Chapter: 13 Magnetic Effects of Electric Current Contents: MCQ Online Tests with Answers

### Class 10 Science Chapter 13 MCQ with Answers for 2022-2023

Class 10 Science Chapter 13 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 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
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

#### For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is

[A]. The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid
[B]. The strong magnetic field produced inside the solenoid can be used to magnetize a piece of magnetic material like soft iron, when placed inside the coil
[C]. The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
[D]. The N- and S-poles exchange position when the direction of current through the solenoid is reversed
Q7

#### 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.
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

#### Naveen is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?

[A]. The production of electricity from magnetism is called electromagnetic induction.
[B]. The process of electromagnetic induction has led to the construction of a generator for producing electricity at power stations.
[C]. An ammeter is an instrument which can detect the presence of electric current in a circuit.
[D]. None of the above.
Q10

#### 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.
Q11

#### 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.
Q12

#### 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.
Q13

#### 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
Q14

#### 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.
Q15

#### 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
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

#### 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

#### 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.
Q22

#### 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.
Q23

#### 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.
Q24

#### 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.
Q25

#### 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

### 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 13?

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 13?

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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