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

Please refer to Magnetic Effect of Electric Current MCQ Questions Class 10 Science below. These MCQ questions for Class 10 Science with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Magnetic Effect of Electric Current will help you to prepare for the exams and get more marks.

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

Please see solved MCQ Questions for Magnetic Effect of Electric Current in Class 10 Science. All questions and answers have been prepared by expert faculty of standard 10 based on the latest examination guidelines.

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

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

Answer

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

Answer

C

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

Answer

A

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

Answer

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.

Answer

D

Question: Which of the following property of a proton can change while it enters freely in a magnetic field? (There may be more than one correct answer.)
(a) mass
(b) speed
(c) velocity
(d) momentum

Answer

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

Answer

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

Answer

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

Answer

C

Assertion-Reason Type Questions (1 Mark)

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

Answer

C

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.

Answer

B

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.

Answer

D

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.

Answer

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

Answer

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

Answer

A

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

Answer

A

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

Answer

C

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

Answer

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.

Answer

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

Answer

A

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

Answer

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

Answer

B

Question. The device used for producing electric current is called
a) generator
b) galvanometer
c) ammeter
d) motor

Answer

A

Question. The essential difference between A.C. generator and a D.C. generator is that
a) A.C. generator has an electromagnet while a D.C. 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 D.C. generator has commentator.

Answer

D

Question. The magnetic field near a long straight wire is described by
a) Straight field lines parallel to the wire.
b) Straight field lines perpendicular to the wire.
c) Connective circle centered on the wire.
d) Radial field lines starting from the wire.

Answer

C

Question. Which of the following properties of a proton can change when it moves freely in a magnetic field
a) mass
b) speed
c) velocity
d) momentum

Answer

C

Question The direction of the magnetic field at a point P above the wire carrying current as shown in the figure is

a) Down the page
b) up the page
c) into the page
d) out of the page

Answer

C

Question. Forces acting on a stationery charge of in the magnetic field B is
a) BQ v
b) BQ/v
c) Bv/Q
d) zero

Answer

D

Question. Choose the correct option:
a) The magnetic field inside a long straight solenoid-carrying current Is zero.
b) Decrease as we move towards its end.
c) Increase as we move towards it end.
d) Is the same all points.

Answer

D

Question. The rectangular coil of copper wires is rotated in a magnetic field. The direction of induced current change once in each
a) one revolution
b) one fourth revolution
c) half revolution
d) two revolutions

Answer

B

Question. Which one 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 centered on the wire

Answer

D

Question. 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 at an electric motor.

Answer

C

Question. A device for producing electric current is called a
a) Galvanometer
b) Motor
c) Generator
d) Ammeter

Answer

C

Question. Concentric circles with arrows centered at the wire AB are shown in figure.
a) No current in AB
b) current flows from B to A
c) current – flows from A to B
d) none of these

Answer

B

Question. A current carrying conductor placed in magnetic field experiences a force. The displacement of the conductor in magnetic field can be increased by
a) Decreasing the magnetic field.
b) Decreasing the current in the conductor.
c) Increasing the magnetic field.
d) None of the above.

Answer

C

Question. Potential difference between a live wire and a neutral wire is
a) 200 volt
b) 150 volt
c) 210 volt
d) 220 volt

Answer

D

Question. A positively charged particle say an alpha particle projected towards west is deflected toward north by a magnetic field. The direction of the magnetic field is
a) Upward
b) downward
c) towards south
d) towards east.

Answer

D

Question. At the time of short circuit, the current in the circuit:
a) reduce substantially
b) does not change
c) increase heavily
d) vary continuously

Answer

C

Question. At the time of short circuit, the current in the circuit
a) vary continuously
b) reduced considerably
c) increases heavily
d) does not change

Answer

C

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

Answer

C , D

Question. A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is:
a) towards south
b) towards east
c) downward
d) upward

Answer

D

Question. Choose the correct option: A rectangular coil of copper wires is rotated in a magnetic filed. The direction of the induced current changes once in each
a) two revolutions
b) one revolution
c) half revolution
d) one-fourth revolution

Answer

C

Question. Electric motor converts
a) Mechanical energy into electrical energy
b) Mechanical energy into heat energy
c) Electrical energy into heat energy
d) Electrical energy into mechanical energy

Answer

D

Question. Magnetic field lines determine
a) The shape of magnetic field
b) Only the direction of magnetic field
c) Only the relative strength of the magnetic field
d) Both the direction and the relative strength of magnetic field

Answer

D

Question. The most important safety device method used for protecting electrical appliances from short circuiting or overloading is
a) Earthing
b) use of stabilizer
c) use of electric meter
d) fuse

Answer

D

Question. Figure shows the magnetic field lines between the two faces A and B of two magnets.

a) Both faces A and B of two bar magnets are North pole.
b) Both faces A and B of two bar magnets are South pole.
c) Face A is south pole while face B is north pole.
d) None of the above.

Answer

D

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

Answer

A

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.

Answer

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

Answer

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.

Answer

B

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.

Answer

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

Answer

C

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.

Answer

B

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

Answer

B

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

Answer

A

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

Answer

A

A ssertion-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: Magnetic field lines do not intersect.
Reason: Magnetic field lines are closed curves.

Answer

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.

Answer

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

Answer

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.

Answer

B

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

Answer

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.

Answer

C

Fill in the Blanks :

Question. Magnetic field lines emerge from the …………. pole of a solenoid or a permanent magnet.

Answer

North

Question. A compass needle is a ……………….. magnet.

Answer

small

Question. In our houses we receive AC electric power of ……… with a frequency of …………..

Answer

220 V, 50 Hz.

Question. The field lines about the wire consist of a series of concentric circles whose direction is given by the ………… rule.

Answer

right-hand

Question. You are looking down the axis of a solenoid, and the current from your position is clockwise. The end of the solenoid facing you is a ………….. pole.

Answer

south

Question. The unit of magnetic field is ………………….

Answer

tesla

Question. You are looking into a solenoid, at its S-pole, along its axis. From your view point, the direction of the current in the solenoid is …………….

Answer

clockwise

Question. Crowding the wires of a solenoid more closely together will ………….. the strength of the field inside it.

Answer

increase

Question. Field lines are used to represent a ……………. .

Answer

magnetic field

Question. The frequency for A.C. (alternating current) in USA is …………….

Answer

60 Hz

True / False :

Question. The field lines inside the infinite solenoid are in the form of parallel straight lines.

Answer

True

Question. A current-carrying conductor when placed in a magnetic field always experiences a force.

Answer

False

Question. The direction of force on a current carrying conductor placed in a magnetic field cannot be reversed by reversing the direction of magnetic field.

Answer

False

Question. An electric generator works on the principle of electromagnetic induction.

Answer

True

Question. A magnetic field exists in the region surrounding a magnet, in which the force of the magnet can be detected.

Answer

True