# MCQs for Science Class 10 with Answers Chapter 13 Magnetic Effect of Electric Current

Students of class 10 Science should refer to MCQ Questions Class 10 Science Magnetic Effect of Electric Current with answers provided here which is an important chapter in Class 10 Science NCERT textbook. These MCQ for Class 10 Science with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 10 Science. The following MCQs can help you to practice and get better marks in the upcoming class 10 Science examination

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

MCQ Questions Class 10 Science Magnetic Effect of Electric Current provided below have been prepared by expert teachers of grade 10. These objective questions with solutions are expected to come in the upcoming Standard 10 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Who has stated the Right hand Thumb Rule?
(a) Orsted
(b) Fleming
(c) Einstein
(d) Maxwell

D

Question. What is that instrument which can detect the presence of electric current in a circuit?
(a) galvanometer
(b) motor
(c) generator
(d) none of above

A

Question. Which device produces the electric current?
(a) generator
(b) galvanometer
(c) ammeter
(d) motor

A

Question. Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the
(a) length of magnet
(b) thickness of magnet
(c) degree of closeness of the field.
(d) resistance offered by the surroundings

A

Question. Which of the following statement is not correct about the magnetic field?
(a) Magnetic field lines form a continuous closed curve.
(b) Magnetic field line do not interest each other.
(c) Direction of tangent at any point on the magnetic field line curve gives the direction of magnetic field at that point.
(d) Outside the magnet, magnetic field lines go from South to North pole of the magnet.

D

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

D

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 the square of the distance from wire.

B

Question. For a current in a long straight solenoid N-pole and S-pole 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, when placed inside the coil.
(c) The pattern of the magnetic field associated with the solenoid is different from thepattern of the magnetic field around a bar magnet.
(d) The N-pole and S-pole exchange position when the direction of current through the solenoid is reversed.

C

Question. 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

C

Question. The strength of each of magnet reduces to half when it cut along its length into the equal parts magnetic field strength of a solenoid. Polarity of solenoid can be    determined by
(a) use of compass needle
(b) Right hand thumb rule
(c) fleming left hand rule
(d) either (a) or (b)

D

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) Nature of core material
(d) All of the above

D

Question. The direction of induced current is given by
(a) Fleming’s right hand rule.
(b) Fleming’s left hand rule.
(c) Right hand thumb rule.
(d) Left hand thumb rule.

A

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

C

Question. The pattern of the magnetic field produced by the straight current carrying conducting wire 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

A

Question. When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is
(a) Twice
(b) Thrice to that when angle is 60°
(c) zero
(d) infinite

A

Question. Magnetic effect of current was discovered by
(a) Oersted
(c) Bohr
(d) Ampere

A

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

A

Question. A positive charge is moving upwards in a magnetic field directed towards north. The particle will be deflected towards
(a) west
(b) north
(c) south
(d) east

A

Question. Switches are connected to
(a) live wire.
(b) neutral wire.
(c) earth wire.
(d) any one.

A

Question. A current through a horizontal power line flows from south to North direction. The direction of magnetic field line 0.5m above it is
(a) North
(b) South
(c) West
(d) East

A

Question. Which of the following factors affect the strength of force experience by a current carrying conduct 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 above.

D

Question. The instrument that use to defect electric current in the circuit is known as
(a) electric motor
(b) A.C generator
(c) galvanometer
(d) none of the above

A

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

D

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 of above

A

Question. A magnetic field directed in north direction acts on an electron moving in east direction. The magnetic force on the electron will act
(a) vertically upwards.
(b) towards east.
(c) vertically downwards.
(d) towards north.

C

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) same in both
(d) can’t say

A

Question. The most important safety method used for protecting home appliances from shortcircuiting or Overloading is
(a) earthing
(b) use of stabilizers
(c) use of fuse
(d) use of electric meter

C

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

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

D

Question. A D.C generator works on the principle of
(a) ohnis law
(b) Joule’s law of heating
(c) faraday’s law of electromagnetic induction.
(d) none of the above

C

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 above

B

Question. An electric generator actually acts as
(a) a source of electric charge.
(b) a source of neat energy.
(c) an electromagnet.
(d) a converter of energy.

D

Question. In 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. The main advantage of A.C power transmission over D.C 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

### Fill in the blanks :

Question. The touching of the live wire and neutral wire directly is known as __________ .

short circuit

Question. When North pole approaches a coil, the front side of the coil will show an __________ current.

anticlockwise

Question. __________ generators are used in power stations to generate electricity which is supplied to our homes.

A.C.

Question. __________ is the commercial unit of electrical energy.

kilowatt hour

Question. A __________ works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.

motor

Question. A D.C. generator is based on the principle of __________ .

electromagnetic induction

### True Or False :

Question. In ideal conditions, green colour insulation is given for live wire.

False

Question. When a coil and magnet both are stationary an induced emf is setup across the coil.

False

Question. Over-loading is caused by connecting many devices to one supply point.

True

Question. Potential of the earthed wire is zero.

True

Question. The rate of change in magnetic flux produces induced emf or potential.

True

Question. When a magnet is moved with its north polarity towards a coil placed in a closed circuit, then the neares face of the coil shows north polarity.

True

Question. By sending current through a coil wound round a rod one can magnetise it permanently.