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

Please refer to MCQ Questions Chapter 13 Magnetic Effect of Electric Current Class 10 Science with answers provided below. These multiple-choice questions have been developed based on the latest NCERT book for class 10 Science issued for the current academic year. We have provided MCQ Questions for Class 10 Science for all chapters on our website. Students should learn the objective based questions for Chapter 13 Magnetic Effect of Electric Current in Class 10 Science provided below to get more marks in exams.

## Chapter 13 Magnetic Effect of Electric Current MCQ Questions

Please refer to the following Chapter 13 Magnetic Effect of Electric Current MCQ Questions Class 10 Science with solutions for all important topics in the chapter.

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

Question: By which instrument, the presence of magnetic field be determined?
a) Magnetic needle
b) Ammeter
c) Galvanometer
d) Voltmeter

A

Question. A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON.
The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to
a) A
b) B
c) A if the current is small, and B if the current is large
d) B if the current is small and A if the current is large

A

Question. Choose the incorrect statement from the following regarding magnetic lines of force
a) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle will point
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

C

Question. If the key in the 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

C

Question. When the speed of rotation of coil is doubled, the frequency of current will be
a) same
b) doubled
c) half
d) qudrapled times

B

Question. If a rectangular copper wired coil is rotated in magnetic field, in how many revolutions, the direction of induced current will be change?
a) one
b) two
c) half
d) three

C

Question. Which of the following property of a proton can change while it enters freely in a magnetic field?
a) mass
b) speed
c) velocity
d) momentum

B

Question. For the 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 magnetise a piece of magnetic material like soft iron core, when placed inside the coil
c) The pattern of 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 positions when the direction of current through the solenoid is reversed

C

Question. Two organs where magnetic field is produced are
a) Heart and lungs
b) Heart and brain
c) Brain and lungs
d) Heart and Liver

B

Question. The magnetic field inside a long straight solenoid-carrying current
a) is zero.
b) decreases as we move towards its end.
c) increases as we move towards its end.
d) is the same at all points.

D

Question: A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid
a) will increase
b) will remains the same
c) will decrease
d) will become zero.

D

Question: The pattern of the magnetic field produced by the straight current carrying conductor is
a) in the direction opposite to the current
b) in the direction parallel to the wire
c) circular around the wire
d) in the same direction of current

C

Question: Inside the magnet, the field lines moves
a) from north to south
b) from south to north
c) away from south pole
d) away from north pole

B

Question: The strength of magnetic field around a current carrying conductor is
a) Inversely proportional to the current but directly proportional to the square of the distance from wire.
b) Directly proportional to the current and inversely proportional to the distance from wire.
c) Directly proportional to the distance and inversely proportional to the current.
d) Directly proportional to the current but inversely proportional to the square of the distance from wire.

B

Question: The factors on which one magnetic field strength produced by current carrying solenoid depends on
a) Magnitude of current
b) Number of turns
c) Nature of core material
d) All of the above

D

Question: Direction of rotation of a coil in electric motor is determined by
a) Fleming‘s right hand rule
b) Fleming‘s left hand rule
c) Faraday law of electromagnetic inductors
d) None of the above

B

Question: In an electric motor, to make the coil rotating continuously in the same direction, current is reversed inthe coil after every half rotation by a device called
a) carbon brush
b) commutator
c) slip ring
d) armature

B

Question: We can induce the current in a coil by
a) moving the coil in a magnetic field
b) by changing the magnetic field around it
c) by changing the orientation of the coil in the magnetic field
d) All the above.

A

Question: The nature of magnetic field line passing through the centre of current carrying circular loop is
a) circular
b) ellipse
c) parabolic
d) straight line

A

Question. Earth wire carries
a) Current
b) Voltage
c) No current
d) None of the above.

C

a) Insulation of wire is damaged
b) fault in the appliances
c) accidental hike in supply voltage
d) All the above.

D

Question. The main advantage of AC power transmission over DC power transmission over long distance is
a) AC transmit without much loss of energy
b) less insulation problem
c) less problem of instability
d) easy transformation

A

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 other.

B

Question. A.C generator works on the principle of
a) force experienced by a conductor in magnetic field
b) electromagnetic induction
c) electrostatic
d) force experienced by a charged particle in electric field

B

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

A

Question. In an electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called
a) carbon brush
b) commutator
c) slip ring
d) armature

B

Question. Which are the characteristics of fuse element?
a) High conductivity
b) Low melting point
c) Do not burn due to oxidation
d) All of the above.

B

Question. What should be the core of an electromagnet?
a) soft iron
b) hard iron
c) rusted iron
d) none of the above.

A

Question. Who has stated the Right Hand Thumb Rule?
a) Orested
b) Fleming
c) Maxwell
d) Einstein

C

Question. Which of the following factors affect the strength of force experience by a current carrying conductor in a uniform magnetic field?
a) magnetic field strength
b) magnitude of current in a conductor
c) length of the conductor within magnetic field
d) All of the above.

D

Question. 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.

A

Question: A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference
a) more in (i) than in (ii) case
b) more in (ii) than in (i) case
c) in both
d) can‘t say

A

Question: The instrument used to detect the electric current in the circuit is known as
a) Galvanometer
b) Ammeter
c) Voltmeter
d) Odometer.

A

Question: Fleming‘s left hand rule and right hand rule are used in
a) Generator and electric motor
b) Electric motor and generator
c) any rule can be used for any rule
d) both are applicable for generator and motor.

B

Assertion-reason type Questions :

For question numbers 1 and 2 two statements are given-one labeled as Assertion (A) and the other labeled
Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the Assertion.
(b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the Assertion.
(c) ‘A’ is true but ‘R’ is false.
(d) ‘A’ is false but ‘R’ is true.

Question. Assertion: Compass is a small magnet and gives direction of magnetic field lines.
Reason: It gets deflected when brought near a bar magnet.

B

Question. Assertion: A current carrying solenoid behaves like a bar magnet.
Reason: When soft iron is placed inside the solenoid it can also be magnetised.

B

For question numbers 1 and 2 two statements are given-one labeled as Assertion (A) and the other labeled
Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the Assertion.
(b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the Assertion.
(c) ‘A’ is true but ‘R’ is false.
(d) ‘A’ is false but ‘R’ is true.

Question. Assertion: Galvanometer is used to detect current.
Reason: Ammeter is used measure current generated in A.C. generator

B

Question. Assertion: When the direction of movement of coil is reversed, the direction of induced current is also reversed.
Reason: Fleming’s right hand thumb rule detects the direction of induced current.

C

For question numbers 1 and 2, two statements are given-one labeled as Assertion (A) and the other labeled
Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the Assertion.
(b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the Assertion.
(c) ‘A’ is true but ‘R’ is false.
(d) ‘A’ is false but ‘R’ is true.

Question. Assertion: Magnetic field lines do not intersect.
Reason: Magnetic field lines are closed curves.

B

Question. Assertion: A compass needle gets defected when electric current is passed through the nearly metallic wire.
Reason: The S.I unit of magnetic field strength is Oersted.

C

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Question. Assertion : There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it.
Reason : Work done by centripetal force is always zero.

A

Question. Assertion : No net force acts on a rectangular coil carrying a steady current when suspended freely in a uniform magnetic field.
Reason : Force on coil in magnetic field is always nonzero.

C

Question. Assertion : In a conductor, free electrons keep on moving but no magnetic force acts on a conductor in a magnetic field.
Reason: Force on free electrons due to magnetic field always acts perpendicular to its direction of motion.

C

Question. Assertion : Force experienced by moving charge will be maximum if direction of velocity of charge is perpendicular to applied magnetic field.
Reason : Force on moving charge is independent of direction of applied magnetic field.

C

Question. Assertion : A proton moves horizontally towards a vertical long conductor having an upward electric current. It will deflect vertically downward.
Reason : Seeing the proton and the conductor from the side of the proton, the magnetic field at the site of the proton will be towards right. Hence the force F = qv×B will deflect the proton vertically downward.

A

Question. Assertion : Magnetic field interacts with a moving charge and not with a stationary charge.
Reason : A moving charge produces a magnetic field.

A

Question. Assertion : A spark occurs between the poles of a switch when the switch is opened.
Reason : Current flowing in the conductor produces magnetic field.

B

Case study questions

1. Study this table related to wattage of home appliances and answer the questions that follow.

Question. Which of the following home applicance is not based on magnetic effect of current?
(a) Ceiling fan
(b) Blender
(c) Geyser
(d) Washing Machine

C

Question. Which of the following lighting device is best to use in terms of power consumption?
(a) Bulb
(b) CFL
(c) Tube light
(d) LED

D

Question. Which of the following will to consume least power?
(a) Laptop
(b) Desktop
(c) Printer
(d) Blender

A

Question. Which of the following will consume maximum power?
(a) Fridge
(b) Iron
(c) Air conditioner
(d) Coffee maker

C

Question. Many appliance works on the principle of electromagnetic induction. The role which depicts the direction of induced current is as
(b) Henery’s rule
(c) Fleming’s rule
(d) Maxwell’s rule

C

2. A magnetic stripe card, also referred to as a swipe card or magstripe, is a plastic card with a magnetic strip attached on its surface. This stripe is made of tiny iron-based components whose magnetism can be modified and can therefore be used to store information. A magstripe is quite similar to a magnetic recording tape, which you might find in videotape or a music cassette. The magnetic strip on a card can be ‘written’ or encoded with information because the tiny iron-based particles that make up the strip can be magnetised in different directions by a device that produces a strong magnetic field. This device is a ‘solenoid’, which is basically a coil wound into a tightly packed helix. The wire is wound around a highpermeable, metallic core that produces a strong magnetic field when a current is passed through it. This device encodes the required information onto the stripe, which is then pasted on a plastic card. When a card with a magnetic strip is moved back and forth over the ‘reader head’ , a voltage is induced in the coils of the card reader device. A card reader consists of solenoid too – the same component that is used to write information in the magnetic strip.
This voltage can be amplified and recorded electronically, which is finally read by a computer (or a processor installed within the reader) to authenticate a user (in the case of identity cards) or a transaction (in the case of credit/debit cards).

Question. Which of the following are the devices that uses magnetic theory to record data
(a) The hotel key cards
(b) Audio tapes
(c) CD’s
(d) All of the above

D

Question. Name the scientist who gave the principle of electromagnetic field
(a) Oersted
(c) Bohr
(d) Ampere

A

Question. The force on a wire inside a magnetic field increase when
(a) The current is increased
(b) Strength of magnetic field increases
(c) Length of wire is increased
(d) All of above

D

Question. The information of users which are read by the ATM machines are stored on
(a) Magnetic box on card
(b) Magnetic strip on card
(c) Inside ATM machine
(d) None of above

B

Question. The factors on which one magnetic field strength produced by current carrying solenoids depends are
(a) Magnitude of current
(b) Number of turns
(c) Heat produced
(d) Both (a) and (b)

D

Fill in the Blanks :

Question. The armature in a motor rotates within a(n) …………. field.

magnetic

Question. A metallic wire carrying an electric current has associated with it a ……….. field.

magnetic

Question. In a magnetic field pointing away from you, an electron traveling to the right will experience a force in the ………….. direction.

downward

Question. Magnetic fields are produced by ……………..

currents

Question. An electric current can be used for making temporary magnets known as ……………..

electromagnets

Question. To produce DC, the output of a generator must be fed through a (n) ……………

commutator

True / False :

Question. The magnitude of induced current can be increased by decreasing the speed of rotation of coil.

False

Question. The direction of force on a current carrying conductor placed in a magnetic field can be reversed by reversing the direction of current flowing in the conductor.

True

Question. In a DC electric motor a pair of split rings is used as commutator.

True

Question. The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor.