Download Assignment_ch5 01. Which appliance is not connected in 6A circuit

Assignment_ch5
01. Which appliance is not connected in 6A circuit?
(A) Air conditioner
(B) Fan
(C) Tape recorder
(D) Bulb
02. Which color of wire is used for earthing?
(A) Black
(B) Red
(C) Green
(D) Yellow
03. Which device is used to convert electric energy into mechanical energy?
(A) Electric generator
(B) Solenoid
(C) Electric motor
(D)
Electric iron
04. Which effect of the el current is used in fuses?
(A) The magnetic effect of el. Current
(B) The chemical effect of el.
current
(C) None of these
(D) The heating effect of elec. current
05. Which instrument indicated the presence of magnetic?
(A) Magnetic needle
(B) Ammeter
(C) Galvanometer
(D) Voltameter
06. Which instrument is used to convert electric energy into mechanical
energy?
(A) Electric iron
(B) Electric motor
(C) Solenoid
(D) Electric
generator
07. Which law enables us to decide direction magnetic field lines due a wire
carrying electric?
(A) Left hand rule of Flaming
(B) Joule's law
(C) Ampere's law
(D)
Right hand thumb rule
08. Which of the following device is based on the principle of
electromagnetic induction?
(A) Voltmeter
(B) Electric generator
(C) Ammeter
Electric motor
(D)
09. Which one has a magnetic field lines similar to a permanent bar
magnet?
(A) A elliptically shaped loop of wire carrying current
(B) A solenoid
carrying current
(C) A liner wire carrying current
(D) A
circular loop of wire carrying current
10. Which option is correct for the magnetic field due to an infinite wire
carrying electric current?
(A) None of these
(B) It is inversely proportional to distance from the wire
(C) It is same every where
(D) It is inversely proportional to distance from
the wire
11. Which statement is incorrect about the fuse wire?
(A) It should be introduced in live wire.
(B) It should be introduced in
allel.
(C)
It is a safety device in the circuit.
(D) It does not
affect the voltage of current.
12. Which type of current is obtained from a battery?
(A) Depends upon the type of battery
(B) AC
Both AC and DC
(C) DC
(D)
13. Which type of metal is not used in making fuse?
(A) Mixture of copper and tin
(B) Aluminium
(C) Nichrome
Pure tin
(D)
14. An electric motor is a device
(A) That converts electrical energy into kinetic energy
(B) There is no
energy conversion of one form to another
(C) That converts
electrical energy to mechanical energy
(D) That converts sound
energy to light energy.
15. Which of the following statements cannot be related to the construction
of an electric motor?
(A) The coil and the axle continuously rotate in one direction.
(B) A
rectangular coil of insulated copper wire is placed between the two poles
of a magnetic field such that two of its allel sides are perpendicular to
the direction of the magnetic field.
(C) The ends of the coil are
connected to the two halves of a split ring.
(D) The inner insulated
sides are attached to axle whereas the external conducting edges touch
two conducting stationary brushes.
16. The direction of the induced current is given by
(A) Fleming’s Right hand Rule
(B) Right Hand Thumb Rule
Fleming’s Left Hand Rule
(D) Faraday's law
(C)
17. According to Fleming’s Right Hand Rule, if we stretch the thumb,
forefinger and middle finger of right hand – forefinger indicates direction
of magnetic field, thumb shows the direction of motion of conductor,
and then the middle finger will show the dire
(A) Induced current
(B) Alternating Current
(C) Magnetic Force
(D) Electric force
18. The induced current is highest when
(A) Direction of motion of coil is at 300 to the magnetic field.
(B)
Direction of motion of coil is at 900 to the magnetic field.
Direction of motion of coil is at 1800 to the magnetic field
Direction of motion of coil is at 600 to the magnetic field.
(C)
(D)
19. Parameters of electricity supply in India are
(A) Potential Difference of 220 V, Frequency of 40 hertz and Current Rating
of 5 A
(B) Potential Difference of 150 V, Frequency of 40 hertz and
Current Rating of 10 A
(C) Potential Difference of 220 V,
Frequency of 60 hertz and Current Rating of 15A
(D) Potential
Difference of 220 V, Frequency of 50 hertz and Current Rating of
5A/15A
20. Pick the incorrect statement regarding fuse. Fuse is used for protecting
the circuits due to
(A) Short-circuiting
(B) Faulty connections
(C) Theft
(D)
Overloading of circuits
21. Which of the following will not cause overloading?
(A) Short circuiting
(B) Connecting many appliances to a single socket
(C) Melting of fuse
(D) Accidental hike in the supply voltage
22. After how many rotations the direction of current is change in the
electric motor?
(A) 3
(B) 1/2
(C) 1/4
(D) 1
23. The magnetic field at the centre of loop ……
(A) Equal to the square of electric current
(B) Inverse of loop radius
(C)
Inverse of the electric current
(D) Equal to the square of radius of loop
24. The magnetic field at the point at distance r when current I is passes
through wire is (A) Equal to I
(B) Inverse of I
(C) Equal to distance
(D) Equal to
square of distance
25. The magnetic field is B for one turn loop, and then the field of solenoid
with N turns is ….
(A) B/N2
(B) N2B
(C) NB
(D) B/N
26. The symbol of inductor is
(A)
`
(B)
.
(C)
'
(D)
,
27. A current carrying wire placed in a magnetic field experiences force in
which direction is this force experienced?
(A) In the opposite direction of the magnetic field
(B) In the direction of
the magnetic field
(C) In the direction of the el. Current
(D)
In a direction perpendicular to the magnetic field
28. Ac voltage used for domestic usage in India is ______
(A) 220V, 110Hz
(B) 220V, 50Hz
(C) 110V, 60Hz
60Hz
(D) 220V,
29. An electric motor.
(A) Generates mechanical energy
(B) Converts electric energy into
mechanical energy
(C) Converts mechanical energy into electrical
energy
(D) Generates electrical energy
30. As move away from the current carrying linear wire, the magnetic field
will –
(A) Becomes zero
(B) Decreases
(C) Remains constant
(D)
Increase
31. Direction of force acting on a current carrying conductor kept in a
magnetic field is given
(A) Faraday’s rule
(B) Fleming’s right hand rule
(C) Fleming’s left
hand rule
(D) Lenz’s rule
32. Due to overloading, the current in circuit becomes.
(A) Less
(B) Zero
(C) Not definite
(D) More
33. Electric energy, used for domestic purpose, is obtained due to
conversion of ……… energy.
(A) Potential
(B) Mechanical
(C) Kinetic.
(D) Chemical
34. For a bar magnet direction of magnetic field lines is …
(A) Coming out of both the poles
(B) From S to N
(D) Entering in both the poles
(C) From N to S
35. For which of the option given below will no el. current be induced in the
loop?
(A) When the loop and magnet are stationary
(B) When the loop and the
magnet are move in the same direction with uniform speed
(C) When
the loop is moved in the reversed direction of magnet
(D) When the loop
and magnet are moved in the opposite direction with uniform speed
36. How will the magnetic field lines be in the center of a current carrying
loop?
(A) Circular
(B) Elliptical
(C) Magnetic field is zero at the wire
(D) Straight line
37. In a solenoid direction of electric current in each turn is same, so
magnetic field produced per turn would be ….
(A) Divided
(B) Added
(C) Multiplied
(D) Subtracted
38. In a tube-light electric energy in converted in to _______.
(A) Light
(B) Mechanical
(C) Electric
(D) Heat
39. In domestic electrical circuit, a fuse must be kept in
(A) Any of the three wires
(B) Live wire
(C) Neutral wire
Earthing wire
(D)
40. In electric Circuit fuse is used because.
(A) It saves the el. Current
(B) It increase voltage
(C) It increase the
current
(D) It protest the electrical appliances from damage
41. In electric Motor the loop having many winding of the wire in arranged
on the axis what is the arrangement called?
(A) Armature
(B) Generator
(C) Commutator
(D) Brush
42. In electric iron electric energy is converted into ……. energy.
(A) Light
(B) Chemical
(C) Mechanical
(D) Heat
43. Magnetic field produced due to current passing in a conductor is ….
(A) In the direction opposite to electric current
(B) In the direction of
electric current
(C) In the direction perpendicular to the current
(D) In the form of circular lines around the current
44. Metal which is used for making fuse should have
(A) High melting point
(B) Logo melting point
point
(D) Law boiling point
(C) High boiling
45. On what does the strength of magnetism of a core depend?
(A) The magnitude of current flowing
(B) The material of core
them
(D) Turns of the coil
(C) All of
46. On which of the factors electro motive force induced in conducting coil
does not depend?
(A) Cost of coil
(B) Number of spokes in the coil
(C) All (a), (b) and
(c)
(D) Rate of change in number of magnetic field line linked with
the coil.
47. On which principle does electric generator work?
(A) Conversion of electric energy into mechanical energy
(B)
Conversion of electric energy into light energy
(C) Conversion of
mechanical energy into electric energy
(D) Conversion of electric
energy into heat energy
48. One what factor is the direction of the magnetic field depends on due to
a linear current carrying conductor.
(A) Material of the linear wire
(B) Direction of el current
(C)
Length of the linear wire
(D) Value of the el. Current
49. What happens when a permanent magnet is quickly moved toward a
loop?
(A) The el. Filed linked with the coil changes
(B) The resistances of
the coil increases
(C) The resistances of coil decreases
(D)
The magnetic field linked with the coil change
50. What is a device to measure potential difference called?
(A) Electric motor
(B) Voltmeter
(C) Ammeter
(D) Electric generator
51. What is a device used to measure current called?
(A) Ammeter
(B) Voltmeter
(C) Galvanometer
(D) Generator
52. What is the color of the neutral wire coming for the main board?
(A) Red
(B) Black
(C) Green
(D) Yellow
53. What is the frequency of 220v Dc voltage?
(A) Zero
(B) 60hz
(C) 50hz
(D) 220hz
54. What is the frequency of electric Current received in our house.
(A) 50hz
(B) 60hz
(C) 220hz
(D) 110hz
55. What is the principle of electric generator?
(A) Conversion of electrical energy to heat energy
(B) Conversion of
electrical energy to light energy
(C) Conversion of mechanical
energy to electrical energy
(D) Conversion of electrical energy to
mechanical energy
56. When current flows clock-wise in a loop, the magnetic polarity of its face
is :
(A) East
(B) North
(C) West
(D) South
57. When current is straight the associated magnetic field is :
(A) Straight
(B) Elliptical
(C) Parabolic
(D) Circular
58. Who discovered electromagnetic induction?
(A) Thomson
(B) Faraday
(C) Oersted
(D) Maxwell
59. Who was the first scientist to observe magnetic effect of electric current?
(A) Ohm
(B) Oersted
(C) Faraday
(D) Ampere
60. The direction of magnetic field around a straight conductor carrying
current can be determined by:
(A) Lenz's law.
(B) Fleming's left hand rule
(C) Right hand
thumb rule
(D) Fleming's right hand rule
61. Magnetic field is produced by the flow of current in a straight wire. This
phenomenon was discovered by:
(A) Faraday
(B) Oersted
(C) Maxwell
(D) Coulomb
62. The magnetic field produced due to a circular wire at its centre is:
(A) in the plane of the wire
(B) at 45o to the plane of the wire
(C) at
60o to the plane of the wire.
(D) perpendiculare to the plane of the wire
63. A magnetic field exerts no force on:
(A) an electric charge moving perpendicular to its direction
(B) a
magnet
(C) an unmagnetised iron bar
(D) a stationary
electric charge
64. At the centre of a magnet, the magnetism is:
(A) maximum
(B) zero
(C) same as at the ploes
minimum
(D)
65. Induced current flows through a coil:
(A) more than the period during which flux changes throug it
(B) only
for the period
(C) less than the period
(D) nome of the
above.
66. Which of the following instruments works by electromagnetic induction?
(A) dynamo
(B) telephone receiver
(C) simple motor
(D)
moving coil galvanomenter
67. A DC generator is based on the principle of:
(A) energy dissipation
(B) magnetic effect of current
effect of current.
(D) electromagnetic induction
(C) heating
68. The use of fuses In electric power-lines is:
(A) to open the line permanently when there is an overload
(B) to
keep main voltage constant
(C) just to show an indication when
there is an overload
(D) as a switch to use in an emergency
69. An induced emf is produed when a magnet is introduced into a coil. The
magnitude of this induced emf does not depend on:
(A) the number of turns of the coil
(B) the speed with which the
magnet is moved
(C) the strength of the magnet
(D) the
resistivity of the wire.
70. Dynamos and motors are based on:
(A) Faraday's law
(B) Faraday's law and Ampere's force law
respectively
(C) Ampere force law and Faraday's law respectively
(D) Ampere's force law
71. When the main switch of the house circuit is put off, it disconnects the:
(A) earth wire
(B) live and neutral wires.
(C) neutral wire
(D) live wire
72. When a fuse is rated at 8 A, it means:
(A) it will work only if current Is 8 A
(B) it will burn if current exceeds
8A
(C) it will not work if current is less than 8 A
(D) if has
a resistance of 8 ohm
73. According to International Convention of colour coding of wires used in
household electrical circuits:
(A) live is brown, neutral is light blue and earth is green.
(B) live is
red, neutral is green and earth is black
(C) live is red, neutral is
black and earth is green
(D) live is brown, neutral is blue and
earth is black
74. For making a strong electromagnet, the material of the core should be:
(A) laminated steel strips
(B) steel
(C) soft iron
(D) brass
75. A soft iron bar is introduced inside a current-carrying solenoid. The
magnetic fleld inside the solenoid:
(A) will decrease
(B) will remai unaffected.
(C) will increase
(D) will become zero
76. The most suitable material for making permanent magnets is:
(A) iron
(B) copper
(C) aluminium
(D) stel
77. The magnetic field lines inside a current- carrying solenoid are:
(A) along the axis and alled to each other
(B) perpendicular to the
axis and equidistant from each other
(C) circular at the ends but
they are allel to the axis inside the solenoid.
(D) circular and they
do not intersect each other
78. The magnetic field lines inside a current- carrying solenoid are:
(A) straight
(B) abolic
(C) curved
(D) circular.
79. Potential difference between a live wire and the neutral wire is:
(A) 210 V
(B) 220 V
(C) 150 V
(D) 200 V
80. A device for producing electric current is called:
(A) galvanometer
(B) ammeter
(C) generator
(D) voltmeter.
81. An electric motor converts:
(A) electrical energy into heat energy
(B) mechanical energy into heat
energh
(C) mechanical energh into electrical energy
(D)
electrical energy into mechanical energy.
82. An electric generatoe converts:
(A) electrical energy into chemical energy
(B) mechanical energy into
electrical energy
(C) mechanical energy into heat energy
(D)
electrical energy into mechanical energy
83. The ring system of wiring is better than the tree system because:
(A) all appliances can be joined in series.
(B) les power is consumed
in the ring system
(C) it is less expensive
(D) it can work
even at low voltage in supply
84. From a power-station, the power is transmitted at a very high voltage
because:
(A) electricity at high voltage is less dangerous
(B) it is cheaper to
produce electricity at high voltage
(C) it is generated only at high
voltage
(D) ther is less loss of energy intransmission at high
voltage.
85. Power is transmitted from a power-house on high voltage AC as:
(A) power cannot be generated at low voltages
(B) it is more
economical due to the less power wasted
(C) the rate of
transmission is faster at high voltage
(D) a precaution against
theft of transmission lines.
86. The SI unit of magnetic field intensity is
(A) Newton
(B) Tesla
(C) Gauss
87. Permanent magnets are not used in
(A) ammeter
(B) galvanometer
bells
(D) Torr
(C) loudspeakers
(D) call
88. An AC source has a frequency of 50 Hz. The number of times, its
dirction changes in one seconds is
(A) 50
(B) 75
(C) 100
(D) 25
89. Overloading is a phenomena of more
(A) resistivity
(B) voltage
(C) resistance
90. Magnetic field lines caused by a solenoid
(A) are curves
(B) start at noth and end at south
everywhere
(D) closed loops
(D) current
(C) uniform
91. Regarding a transfromer which of the following is incorect?
(A) Performs based on the number of turns
(B) Principle is induction
(C) Varying potential is required
(D) Energy is produced or lost
92. The phenomena of electromagnetic induction is the process of
(A) Activating an electric motor
(B) Generating magnetic field
(C)
Getting current due to relative motion between a magnet and a coil
(D) Charging a body
93. Fuse wire is
(A) an alloy
(B) a semiconductor
conductor
(C) an insulator
94. The devic for producing electric current is called a
(A) galvanometer
(B) motor.
(C) generator
(D) a
(D) ammeter
95. At the time of short circuit, the current in the circuit
(A) increases heavily
(B) does not change
(C) vary continuously.
(D) reduces substantially
96. Passage of current through a straight conductor display some fixed
pattern. Pick out the odd one
(A) Magnitude of the magnetic field produced at a given point increases as
the current through wire increases
(B) Direction of the field lines
is in accordance with the right hand thumb rule
(C) The magnetic
field produced by a given current in the conductor increases as the
distance from it decreases
(D) Field lines are unaffected by the
quantity of current flowing
97. The phenomenon of electro-magnetic induction is
(A) The process of charging a body
(B) Producing induced current in a
coil due to relative motion between the magnet and the coil.
(C)
The process of generating magnetic field due to a current passing
through a coil.
(D) The process of rotating a coil.
98. A magnetic field cannot exert any force on a
(A) Moving magnet
(B) Stationary charge
(D) Stationary magnet
(C) Moving charge
99. Degree of closeness of the magnetic field lines signifies:
(A) Direction of the magnetic field
(B) Number of magnetic fields
(C) Distance between different magnetic fields
(D) Relative strength
of the magnetic field
100. When the current in a wire moves from south to north, the direction of
the deflection in the magnetic needle parallel to the wire will be:
(A) East to west
(B) East to north
(C) West to east
(D) West
to south
101. The region surrounding a magnet, in which the force of the magnet can
be detected is said to have
(A) Magnetic field
(B) Magnetic poles
(C) Electric field
(D)
Electric poles
102. Which of the following is not the special features of magnets?
(A) They have two distinct North and South poles.
(B) Like poles attract
each other and unlike poles repel each other.
(C) They align in the
North –South direction when suspended freely
(D) The magnetic
field lines produced due to a magnet are closed curves.
103. Direction of the force experienced by a current-carrying conductor
when placed in a magnetic field is dependent on
(A) Direction of current as well as the direction of magnetic field
(B)
Direction of the current alone
(C) Direction of the magnetic field
alone
(D) Direction of electric field
104. The magnitude of the force experienced by a current-carrying
conductor when placed in a magnetic field will be
(A) Maximum if the directions of current and magnetic field are
perpendicular to each other
(B) Maximum if the directions of
current and magnetic field are opposite to each other
(C)
Maximum if the directions of current and magnetic field are same
(D) Minimum if the directions of current and magnetic field are
perpendicular to each other
105. Which of the following is not true for an electric generator
(A) Works on the basis of electromagnetic induction
(B) Converts
mechanical energy into electrical energy
(C) Can be used to
generate AC or DC
(D) Converts electrical energy to mechanical
energy
106. An alpha particle is projected towards west and gets deflected towards
north by a magnetic field. The direction of the magnetic field is
(A) Downwards
(B) Towards south
(C) Towards east
(D)
Upwards
107. An electric current through a metallic conductor produces a/an
_________ around it.
(A) Gravitational field
(B) Magnetic field
(C) Electromagnetic
effect.
(D) Electric field
108. A straight conducting wire is placed parallel to and over a compass
needle. The deflection in the needle
(A) Keeps fluctuating on passage of current in any direction
(B)
Becomes opposite when the direction of the current is reversed
(C)
Remains in the same direction even on reversing the direction of current
(D) Is negligible on reversing the direction of current
109. At every point of a current carrying circular loop, the concentric circles
representing the magnetic fields around it would become
(A) Smaller and smaller as we go away from the wire.
(B) There is no
fixed pattern for circles.
(C) Larger and larger as we move away
from the wire.
(D) So large at the centre of circular loop that they
look like straight lines
110. Which of the following statements is not true?
(A) Magnitude of magnetic field is directly proportional to the quantity of
current flowing through the current.
(B) The pattern of the
magnetic field around a conductor due to an electric current flowing
through it depends on the shape of the conductor.
(C) Magnetic
field produced by the passage of current through a straight wire is
permanent.
(D) The magnetic field of a solenoid carrying a current
is similar to that of a bar magnet.
111. Magnetic field produced inside a solenoid are so strong that
(A) They are still not able to magnetise a magnetic material.
(B) They
can be used to magnetise a magnetic material, when placed near the
coil
(C) They become permanent
(D) They can be used to
magnetise a magnetic material, when placed inside the coil.
112. Increase in number of turns of a coil in the solenoid will
(A) Will decrease the strength of the magnetic field
(B) Have no effect
on the strength of magnetic field
(C) Will change the direction of
the magnetic field
(D) Will add to the strength of the magnetic field
113. An electromagnet consists of a core of ___________ wrapped around
with a coil of ________ copper wire.
(A) Aluminium, Insulated
(B) Magnet, uncovered
(C) Soft iron,
uncovered
(D) Soft iron, insulated
114. A current-carrying conductor when placed in a magnetic field
experiences
(A) It always remains in equilibrium
(B) An acceleration
(C)
Demagnetisation
(D) A force
Answers:
01 : A B C D  02 : A B C D  03 : A B
C

04 : A
C

07 : A
C

10 : A
C

13 : A
C

16 : A
C

19 : A
C

22 : A
C

25 : A
C

28 : A
C

31 : A
C

34 : A
C

37 : A
C

40 : A
C

43 : A
C

46 : A
C

49 : A
D 

B C D  05 : A B C D  06 : A B
D 
B C D  08 : A B C D  09 : A B
D 
B C D  11 : A B C D  12 : A B
D 
B C D  14 : A B C D  15 : A B
D 
B C D  17 : A B C D  18 : A B
D 
B C D  20 : A B C D  21 : A B
D 
B C D  23 : A B C D  24 : A B
D 
B C D  26 : A B C D  27 : A B
D 
B C D  29 : A B C D  30 : A B
D 
B C D  32 : A B C D  33 : A B
D 
B C D  35 : A B C D  36 : A B
D 
B C D  38 : A B C D  39 : A B
D 
B C D  41 : A B C D  42 : A B
D 
B C D  44 : A B C D  45 : A B
D 
B C D  47 : A B C D  48 : A B
D 
B C D  50 : A B C D  51 : A B
C

52 : A
C

55 : A
C

58 : A
C

61 : A
C

64 : A
C

67 : A
C

70 : A
C

73 : A
C

76 : A
C

79 : A
C

82 : A
C

85 : A
C

88 : A
C

91 : A
C

94 : A
C

97 : A
C

D 
B C D  53 : A B C D  54 : A B
D 
B C D  56 : A B C D  57 : A B
D 
B C D  59 : A B C D  60 : A B
D 
B C D  62 : A B C D  63 : A B
D 
B C D  65 : A B C D  66 : A B
D 
B C D  68 : A B C D  69 : A B
D 
B C D  71 : A B C D  72 : A B
D 
B C D  74 : A B C D  75 : A B
D 
B C D  77 : A B C D  78 : A B
D 
B C D  80 : A B C D  81 : A B
D 
B C D  83 : A B C D  84 : A B
D 
B C D  86 : A B C D  87 : A B
D 
B C D  89 : A B C D  90 : A B
D 
B C D  92 : A B C D  93 : A B
D 
B C D  95 : A B C D  96 : A B
D 
B C D  98 : A B C D  99 : A B
D 
100 : A B C D 101 : A B C D 102 : A B
C D 

103 : A B C
C D 

106 : A B C
C D 

109 : A B C
C D 

112 : A B C
C D 
D 104 : A B C D 105 : A B
D 107 : A B C D 108 : A B
D 110 : A B C D 111 : A B
D 113 : A B C D 114 : A B