# Magnetic Effect of Electric Current MCQ Class 10 Science

Please refer to Chapter 13 Magnetic Effect of Electric Current MCQ Class 10 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 10 Science. Students should refer to MCQ Questions for Class 10 Science with Answers to score more marks in Grade 10 Science exams. Students should read the chapter Magnetic Effect of Electric Current and then attempt the following objective questions.

## MCQ Questions Class 10 Science Chapter 13 Magnetic Effect of Electric Current

The Magnetic Effect of Electric Current MCQ Class 10 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The magnetic field intensity produced due to a current carrying coil is maximum at-
(A) any point
(B) the centre of the coil
(C) any point lying on the axis of the coil
(D) points lying between centre of the coil and its circumference

B

Question. AC is preferred because –
(A) it is cheap
(B) it is easily reproducible
(C) it is economical in transmission
(D) it is not dangerous

C

Question. The direction of magnetic lines of force produced by passing a direct current in a conductor is-
(A) perpendicular to the conductor and coming outwards
(B) parallel to conductor
(C) surrounding the conductor and of circular nature
(D) perpendicular to the conductor & coming inwards

C

Question. Which of the following statement is not correct about two parallel conductors carrying equal currents in the same direction ?
(A) Each of the conductors will experience a force
(B) The two conductors will repel each other
(C) there are concentric lines of force around each conductor.
(D) Each of the conductors will move if not prevented from doing so.

B

Question. Which of the following datermine the direction of magnetic field due to a current carrying conductor ?
(A) Faraday’s laws of electromagnetic induction
(B) Fleming’s left-hand rule
(C) Lenz’s law
(D) Maxwell’s cork screw rule

D

Question. A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then.
(A) a current will be induced in the coil
(B) no current will be induced in the coil
(C) only emf will be induced in the coil
(D) an emf and current both will be induced in the coil

B

Question. Lenz’s law:
(A) is the same as the right hand palm rule
(B) determines the magnitude of an induced e.m.f.
(C) bears no relation to the law of conservation of energy
(D) is useful in deciding about the direction of an induced e.m.f.

D

Question. A length of wire carries steady current. It is bent first to form a circular plane coil of one turn. The same length is now bent to give a double loop of smaller radius. The magnetic field produced at the centre by the same  current will be-
(A) a quarter of its first value
(B) a half of first value
(C) four times its first value
(D) unaltered

C

Question. If a soft iron piece is buried under the surface of earth in the north and south direction, then-
(A) it will acquire the properties of a magnet
(B) its properties will not change
(C) it will behave like an insulator
(D) can’t say with surity

A

Question. Force acting on a stationary charge Q in the magnetic field B is-
(A) BQV
(B) BV/Q
(C) Zero
(D) BQ/V

C

Question. The permanent magnets are kept with soft iron pieces at ends as keepers :
(A) to magnetise the soft iron pieces
(B) to increase the strength of the magnets
(C) to avoid self demagnetisation
(D) for physical safety of the magnets

C

Question. When a bar magnet is broken into two pieces-
(A) we will have a single pole on each piece
(B) each piece will have two unlike poles
(C) each piece will have two like poles
(D) none of these

B

Question. Lenz’s law is a consequence of the law of conservation of:
(A) energy
(B) momentum
(C) angular momentum
(D) charge and mass

A

Question. Current is induced in a coil by electromagnetic induction when
(A) Only the coil moves in a magnetic field
(B) Only the magnetic is moved into a coil
(C) Coil and the magnet move with respect to each other
(D) None of the above

C

Question. The induced emf produced when a magnet is inserted into a coil does not depend upon:
(A) the number of turns in the coil
(B) the resistance of the coil
(C) the magnetic moment of the magnet
(D) the speed of approach of the magnet

B

Question. A proton is moving with velocity 104 m/s parallel to the magnetic field of intensity S tesla. The force on the proton is –
(A) 8 × 10–15 N
(B) 104 N
(C) 1.6 × 10–19 N
(D) Zero

D

Question. When the current through a solenoid increases at a constant rate, the induced current:
(A) is a constant and in the direction of inducing current
(B) is a constant and is opposite to the direction of inducing current
(C) increases with time and is in the direction of inducing current
(D) increases with time and is opposite to the direction of inducing current

B

Question. A.C. used in our domestic consumption has a frequency-
(A) 60 Hz
(C) 50 Hz
(C) 30 Hz
(D) 100 Hz

B

Question. The intensity of a magnetic field is defined as the force experienced by a-
(A) standard compass
(B) unit positive charge
(C) unit negative charge
(D) unit north pole

D

Question. A wire of length λ is placed in a magnetic field B, If the current in the wire is I, then maximum magnetic force on the wire is –
(A) BIλ
(B) B/Iλ
(C) Iλ/B
(D) I/λ

A

Question. A wire carrying a current of 5A is placed perpendicular to a magnetic induction of 2T.
The force on each centimeter of the wire is –
(A) 1N
(B) 100N
(C) 0.1 N
(D) 10 N

C

Question. A solenoid having an iron core has its terminals connected across an ideal D.C.
source. If the iron core is removed the current  flowing through solenoid:
(A) increases
(B) decreases
(C) remains unchanged
(D) nothing can be said

A

Question. Fleming’s left hand and Right hand rules are used in
(A) Generator and electric motor
(B) Electric motor and generator
(C) any rule can be used for any device
(D) both are not applied for generator and motor.

B

Question. Which among of these are the main characteristics of fuse element?
(A) High conductivity
(B) low melting point
(C) do not bum due to oxidation
(D) All of the above

D

Question. If the current values periodically from zero to a maximum value, back to zero and then reverses its direction, the current is
(A) direct
(B) alternative
(C) pulsating
(D) none of the above

B

Question. If the key in the given arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are
(A) concentric circles
(B) elliptical in shape
(C) straight lines parallel to each other
(D) concentric circles near the point O but of elliptical shapes as we go away from it

A

Question. The condition for the praenomen of electromagnetic induction is that there must be a relative motion between
(A) the galvanometer and magnet
(B) the coil of wire and galvanometer
(C) the coil of wire and magnet
(D) the magnet and galvanometer

C

Question. The strength of magnetic field inside a long current carrying straight solenoid is
(A) more at the ends than at the centre
(B) minimum in the middle
(C) same at all points
(D) found to increase from one end to the other

C

Question. Earth wire carries
(A) current
(B) voltage
(C) no current
(D) heat

C

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

B

Question. The best material to make permanent magnets is
(A) aluminium
(B) soft iron
(C) copper
(D) alnico

D

Question. The magnetic field lines always begin from
(A) N-pole and end on S-pole.
(B) S-pole and end on N-pole.
(C) start from the middle and end at N-pole.
(D) start from the middle and end at S-pole.

A

Question. The magnetic field is the strongest at
(A) middle of the magnet.
(B) north pole.
(C) south pole.
(D) both poles.

D

Question. Material of the core of a strong magnet is
(A) aluminium
(B) soft iron
(C) copper
(D) steel

B

Question. What should be the core of an electromagnet?
(A) soft iron
(B) hard iron
(C) rusted iron
(D) none of above

A

Question. Magnetic lines of force inside current carrying solenoid are
(A) perpendicular to axis.
(B) along the axis and are parallel to each other.
(C) parallel inside the solenoid and circular at the ends.
(D) circular.

C

Question. A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid
(A) will become zero.
(B) will increase.
(C) will decrease.
(D) will remain unaffected.

B

Question. The direction of force on a current carrying conductor in a magnetic field is given by
(A) Fleming’s left hand rule.
(B) Fleming’s right hand rule.
(C) Right hand thumb rule.
(D) Left hand thumb rule.

A

Fill in the Blanks :

Question. The magnetic lines of force are the lines drawn in a magnetic field along which a …………. pole would move.

north magnetic

Question. Field lines are shown closer together where the magnetic field is ………………..

greater.

Question. In any generator, the current in the armature is of the ………. type.

A.C

Question. A generator converts mechanical energy into ……… energy. It works on the basis of ………………….

electrical, electromagnetic induction.

Question. In an AC generator, maximum number of lines of force pass through the coil when the angle between the plane of coil and lines of force is …….

90 degree

Question. The N-pole of a compass points to the ………….. pole of a permanent magnet.

South

Question. The force that a magnetic field exerts on a current is always perpendicular to the …………. and to the

field, current

Match the Following :

Question.

(A) → q, (B) → s, (C) → r, (D) → p

Question. Equal currents i flow in two wires along x and y axis as shown. Match the following :