# Class 10 Science Chapter 13 MCQ

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 2020-2021

 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 2020-2021

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

#### 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

Q3

#### 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
Q4

#### 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.

Q5

#### 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.
Q6

#### 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

Q7

#### 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.
Q8

#### 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

Q9

#### 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.
Q10

#### 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?

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

##### What is magnetic field?

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?

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 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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