RBSE Class 10 Science Physics Magnetic Effects of Electric Current MCQs (Objectives) are very important for students preparing for Board Exams. These MCQS have been prepared on the basis of important topics of Magnetic Effects of Electric Current.
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Class 10 Science Chapter Magnetic Effects of Electric Current Objectives
In this post, you will find high- quality, exam oriented MCQs with answers prepared according to the latest RBSE Class 10 Science syllabus. You can solve these MCQs after reading Quick Revision Notes and also solve the questions of the chapter Magnetic Effects of Electric Current.
Whether you are a student looking for quick revision or a
teacher searching for readymade study material, this post is for you.
1. In a current carrying
conductor, the direction of magnetic field is, determined by
(a) Maxwell’s right hand
rule
(b)Fleming’s right hand rule
(c) Fleming’s left hand rule
(d)Faraday’s left hand rule
Correct answer- (a)
2. The magnetic force lines
always begin from
(a) south pole to north pole
(b) north pole to south pole
(c)middle to north pole
(d)middle to south pole
Correct answer-(a)
3.A compass needle is
(a) A bar magnet
(b)A needle
(c) An electro-magnet
(d) None of above
Correct answer-(a)
4.Choose the incorrect
statement
(a) The right hand thumb rule is
used to find the direction of magnetic field due to current carrying conductors.
(b) The difference between the
direct and alternating current is that the direct current flows in one
direction and alternating current changes its direction periodically.
(c)Fleming’s right hand rule is
used to find the direction of induced current.
(d) In India, frequency of
alternating current is 100Hz.
Correct answer –(d)
5.When a current carrying
conductor is placed in a strong magnetic field, the direction of force, is
determined by
(a) Maxwell’s right hand rule
(b)Fleming’s right hand rule
(c) Fleming’s left hand rule
(d)Faraday’s left hand rule
Correct answer- (c)
6.An electric generator acts
as-
A converter of energy
A source of electrical
charge
Source of power
An electromagnet
Correct answer- (a)
7.The magnetic
effect of current was discovered by
(a)Henry
(b) Orested
(c) Farady
(d) Fleming
Correct answer- (b)
8.Electromagnetic induction
is involved in
(a) rotation of the coil of an electric motor
(b) charging a body with negative
(c) production of current by relative motion
between a magnet and a coil
(d) generation of magnetic
field due to a current carrying solenoid.
Correct answer- (c)
9.The main power supply of a
house is a 2A ampere fuse. How many 50 watt bulbs can be used in the house at
the normal voltage?
(a) 9
(b) 7
(c) 4
(d) 8
Correct answer-(d)
10.The direction of magnetic
field associated with a current carrying conductor can be find by.
(a) Right hand thumb rule
(b) Fleming’s left hand rule
(c) Fleming’s right hand
rule
(d) None of above
Correct answer- (a)
11.The strength of magnetism
of a core depends on
(a) The magnitude of current
flowing
(b) Turns of coil
(c) The material of core
(d) All the above
Correct answer- (d)
12.Which statement is
incorrect about the fuse wire
(a) It should be introduced in live wire
(b) It should be introduced in parallel
(c) It does not affect the voltage of current
(d) It is a safety device in the circuit
Correct answer- (b)
13.According to Fleming’s
right hand rule, index finger gives direction of
(a)Induced current
(b) Magnetic field
(c)Motion
(d) Force
Correct answer-(b)
14. A positive charge
projected towards east is deflected towards north by a magnetic field, the
magnetic field is directed
(a) Upward
(b) Downward
(c) Towards west
(d) Towards south
Correct answer-(b)
15.Which statement is
incorrect about the domestic circuit
(a)Fuse-wire and all switches
should be in live-wire
(b)Fuse-wire and all switches
should be in series
(c)Earth-wire should be used
(d)The joints and connections
of switches should be loose
Correct answer- (d)
16.A resistance used in a
circuit, is divided into two equal parts and they are connected in parallel,
the resistance of the circuit.
(a) is decreased
(b) is increased
(c) First it will decrease and then increase
(d) first it will increase
and then decrease
Correct answer- (a)
17. A transformer changes
(a) The electrical energy
(b)the resistance
(c) Electrical potential
(d)direction of current
Correct answer- (c)
18.An electric generator
actually acts as
(a) a source of electric charge
(b)a source of heat energy
(c) an electromagnet
(d)a convertor of energy
Correct answer- (d)
19.Electric appliances
having metallic body, are connected with, for safety purpose
(a) a fuse wire
(b) an earthing
(c) neutral wire
(d) are connected in
parallel arrangement
Correct answer- (b)
20. In domestic circuits,
the colour of live wire is
(a) black
(b)red
(c) green
(d)not certain
Correct answer- (b)
21.According to Fleming’s
left hand rule, thumb gives the direction of
(a)Magnetic field
(b)Force
(c)Current
(d)None
Correct answer-(a)
22.Field inside a solenoid
is-
(a)Inversely proportional to
number of turns
(b)Directly proportional to its
length
(c)Directly proportional to
current
(d)Inversely proportional to
current
Correct answer-(c)
23.In your town cost of
electricity is 60 per unit. You pay for-
(a)Electric energy
(b)Electric current
(c)Electric charge
(d)Electric power
Correct answer-(a)
24.A piece of slip ring is
used in
(a)AC motor
(b)DC generator
(c)AC generator
(d)DC motor
Correct answer-(c)
25. In domestic circuits the
colour of earth wire is
(a) black
(b)red
(c) green
(d)not certain
Correct answer- (a)
26.The magnetic field inside
a solenoid is-
(a)Uniform
(b)Circular
(c) Non uniform
(d) None of above
Correct answer-(a)
27.In domestic circuit, all
electric appliances are connected in
(a)Series
(b) parallel
(c)Both series and parallel
(d) Neither series nor parallel
Correct answer- (b)
28.In domestic circuits the
colour of earth wire is
(a) black
(b)red
(c) green
(d)not certain
Correct answer- (c)
29. A magnet attracts-
(a)all metals
(b)plastics
(c)iron and steel
(d)non- metals
Correct answer- (c)
30.To detect the presence of
current in a circuit we use
(a) Voltmeter
(b) Ammeter
(c) Thermo meter
(d)Galvanometer
Correct answer- (d)
31.The north pole of earth
magnet is in the –
(a)Geographical north
(b)Geographical east
(c)Geographical west
(d)Geographical south
Correct answer-(d)
32. The magnetic field l is
the strongest at –
(a)at north pole
(b)at south pole
(c)in the middle part of the
magnet
(d)at both poles
Correct answer-(d)
33. An electric motor –
(a)Converts mechanical energy
into electrical energy
(b)Converts electrical energy
into mechanical energy
(c)Is based on magnetic effect
of electric current
(d)All above
Correct answer-(b)
34. At the time of short
circuit , the electric current in the circuit –
(a)Not changed
(b)Reduces
(c)Increases extremely
(d)None of these
Correct answer-(c)
35. The voltage and
frequency of AC current which we receive in our houses, is
(a) 440 V, 100 HZ
(b)30 V, 75 Hz
(c) 220 V, 50 Hz
(d)110 V, 100 Hz
Correct answer- (c)
36. The core of an electromagnet is made of
(a) Brass
(b) Soft iron
(c) Aluminium
(d) Steel
Correct answer-(b)
37. The region around a
magnet in which force of attraction and repulsion is detected is called-
(a) Electromagnetic induction
(b) Electric
field
(c) Magnetic field
(d) All above
Correct answer-(c)
38.The strength of magnetic
field inside a long current carrying solenoid is-
(a) Maximum at the ends
(b) Minimum in
the middle
(c) Increase from one end to the other
(d) Same at all
points
Correct answer- (b)
39. The device which use a
permanent magnet-
(a) Loudspeakers
(b) Galvanometer
(c) Both (a) and (b)
(d) None of
above
Correct answer-(c)
40.A generator works on the
basis of –
(a) Magnetic effect of electric current
(b) Heating
effect of electric current
(c) Electromagnetic induction
(d) None of
above
Correct answer-(c)
41. Commercial electric
motors do not use
(a) An electromagnet to rotate the armature
(b) A permanent
magnet to rotate the armature
(c) Coil carrying large number of turns of conducting wire
(d) A soft iron
on which the coil wound
Correct answer-(b)
42. A fuse in electric
circuit is used to prevent –
(a) Short circuit
(b) Overloading
(c) Both (a) and (b)
(d) None
Correct answer-(c)
43. A generator has
following essential part/parts-
(a) Armature
(b) Field
magnet
(c) Slip rings with brushes
(d) All above
Correct answer-(d)
44.The potential of a
neutral wire is
(a) Maximum
(b) Minimum
(c) Zero
(d) Both (a)
and (b)
Correct answer-(c)
45.The most important safety method used for protecting home appliances from short
circuit is
(a) Use of fuse
(b) Earthing
(c) Use of stabilizer
(d) Use of
switch in circuit
Correct answer-(a)
46.The magnetic field lines
–
(a) Do not interest
(b) Intersect
at right angles to one another
(c) Cross at angle of 60°
(d) Cross at
angle of 45°
Correct answer-(a)
47.Magnetic field at at the
centre of a circular coil of radius ‘r’ through which current ‘I’ flows is
(a) Inversely proportional to I
(b) Directly
proportional to r
(c) Directly proportional to I
(d) Inversely
proportional to r
Correct answer-(c)
48.Which one the given has
its working based on electromagnetic induction?
(a) Voltmeter
(b) Transformers
(c) Solenoid
(d) Ammeter
Correct answer –(b)
49.Material of the core of a
strong magnet is
(a) soft iron
(b) copper
(c) plastic
(d) steel
Correct answer- (a)
50.Batteries are source …………………..current.
(a) Alternating current
(b) Direct
current
(c) Both (a) and (b)
(d) None of
these
Correct answer-(b)
51.A current carrying wire
produces-
(a) Electrical field
(b) Magnetic
field
(c) Both electrical field and
magnetic field
(d) Neither
electrical field nor magnetic field
Correct answer-(c)
52. Magnetic field in a current carrying conductor placed
in a magnetic field changes due to
(a) Change in current in conductor
(b) Relative
motion between conductor and magnet
(c) Both (a) and (b)
(d) None of
above
Correct answer-(c)
53. The unit of magnetic field is ………
(a) Tesla
(b) Weber
(c) Ampere
(d) Joule
Correct answer-(a)
54. To convert an Ac
generator into DC generator
(a) slip rings and brushes should be used
(b) split rings
called commutators are used
(c) a rectangular wire loop has to be used
(d) a stronger
magnetic field hat to be used
Correct answer-(b)
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