1. The branch of physics which deals with charges in motion is called
A) Current electricity
B) Static electricity
C) Magnetism
D) Optics
Answer: A) Current electricity
Explanation: Current electricity studies the flow of moving charges through conductors.
2. Electric current is the flow of
A) Electrons
B) Protons
C) Neutrons
D) Atoms
Answer: A) Electrons
Explanation: In metals, electrons move freely and constitute current.
3. The SI unit of electric current is
A) Ampere
B) Volt
C) Ohm
D) Watt
Answer: A) Ampere
4. Electric current is measured using a
A) Ammeter
B) Voltmeter
C) Ohmmeter
D) Galvanometer
Answer: A) Ammeter
5. An ammeter is always connected in
A) Series
B) Parallel
C) Across the circuit
D) Randomly
Answer: A) Series
Explanation: The current must pass through the ammeter to measure it.
6. The instrument used to measure potential difference is
A) Voltmeter
B) Ammeter
C) Galvanometer
D) Wattmeter
Answer: A) Voltmeter
7. A voltmeter is always connected in
A) Parallel
B) Series
C) Across current
D) Randomly
Answer: A) Parallel
Explanation: It measures the voltage between two points.
8. The unit of potential difference is
A) Volt
B) Ampere
C) Ohm
D) Coulomb
Answer: A) Volt
9. A closed conducting path for electric current is called
A) Electric circuit
B) Magnetic loop
C) Electric pole
D) Coil
Answer: A) Electric circuit
10. The material that allows electric current to pass through easily is called
A) Conductor
B) Insulator
C) Semiconductor
D) Plastic
Answer: A) Conductor
11. The material that does not allow current to pass through is called
A) Insulator
B) Conductor
C) Semiconductor
D) Alloy
Answer: A) Insulator
12. Examples of good conductors are
A) Copper and silver
B) Rubber and glass
C) Wood and paper
D) Plastic and cloth
Answer: A) Copper and silver
13. Examples of insulators are
A) Plastic and rubber
B) Silver and iron
C) Copper and aluminium
D) Steel and lead
Answer: A) Plastic and rubber
14. The rate of flow of electric charge is called
A) Electric current
B) Resistance
C) Voltage
D) Power
Answer: A) Electric current
15. The opposition offered to the flow of current is called
A) Resistance
B) Conductance
C) Power
D) Capacitance
Answer: A) Resistance
16. The unit of resistance is
A) Ohm
B) Ampere
C) Volt
D) Watt
Answer: A) Ohm
17. The device used to control current in a circuit is called
A) Rheostat
B) Battery
C) Transformer
D) Generator
Answer: A) Rheostat
18. The material whose resistance is very low is
A) Conductor
B) Insulator
C) Plastic
D) Rubber
Answer: A) Conductor
19. The material whose resistance is very high is
A) Insulator
B) Conductor
C) Metal
D) Water
Answer: A) Insulator
20. The reciprocal of resistance is called
A) Conductance
B) Capacitance
C) Inductance
D) Reactance
Answer: A) Conductance
Explanation: Conductance measures how easily current can flow.
21. The unit of conductance is
A) Siemens
B) Ohm
C) Volt
D) Ampere
Answer: A) Siemens
22. A battery is a combination of
A) Cells
B) Resistors
C) Coils
D) Capacitors
Answer: A) Cells
23. The chemical source of electricity is
A) Battery
B) Generator
C) Transformer
D) Motor
Answer: A) Battery
24. A dry cell converts
A) Chemical energy into electrical energy
B) Mechanical energy into heat
C) Light into sound
D) Heat into magnetic energy
Answer: A) Chemical energy into electrical energy
25. The positive terminal of a dry cell is called
A) Cathode
B) Anode
C) Negative terminal
D) Neutral
Answer: A) Cathode
26. The negative terminal of a dry cell is called
A) Anode
B) Cathode
C) Earth
D) Neutral
Answer: A) Anode
27. The direction of conventional current is
A) From positive to negative
B) From negative to positive
C) In both directions
D) Opposite of flow of charge
Answer: A) From positive to negative
28. The direction of electron flow is
A) From negative to positive
B) From positive to negative
C) Random
D) Perpendicular to current
Answer: A) From negative to positive
29. In metals, electric current is due to
A) Movement of free electrons
B) Movement of protons
C) Movement of ions
D) Movement of holes
Answer: A) Movement of free electrons
30. The instrument used to detect weak current is
A) Galvanometer
B) Ammeter
C) Voltmeter
D) Wattmeter
Answer: A) Galvanometer
31. A conductor has more resistance if it is
A) Long and thin
B) Short and thick
C) Short and thin
D) Long and thick
Answer: A) Long and thin
Explanation: Resistance increases with length and decreases with thickness.
32. Resistance of a wire depends on
A) Length, area, and material
B) Color
C) Temperature only
D) Type of battery
Answer: A) Length, area, and material
33. The resistance of a metal wire increases with
A) Increase in temperature
B) Decrease in temperature
C) Constant temperature
D) Cooling
Answer: A) Increase in temperature
34. The resistance of an insulator decreases with
A) Increase in temperature
B) Decrease in temperature
C) Pressure
D) Light
Answer: A) Increase in temperature
35. Ohm’s Law states that
A) Current is directly proportional to voltage
B) Voltage is constant
C) Resistance is zero
D) Power is inversely proportional
Answer: A) Current is directly proportional to voltage
36. A resistor is used to
A) Limit the flow of current
B) Store energy
C) Amplify current
D) Generate electricity
Answer: A) Limit the flow of current
37. The device used to protect a circuit from excessive current is called
A) Fuse
B) Coil
C) Rheostat
D) Capacitor
Answer: A) Fuse
Explanation: A fuse melts and breaks the circuit if current exceeds safe limits.
38. The wire used in fuses has
A) Low melting point
B) High melting point
C) No resistance
D) Magnetic property
Answer: A) Low melting point
39. The material commonly used for making fuse wire is
A) Tin and lead alloy
B) Copper
C) Aluminium
D) Iron
Answer: A) Tin and lead alloy
40. A short circuit occurs when
A) Current flows through low resistance path accidentally
B) Battery is disconnected
C) Fuse is removed
D) Switch is open
Answer: A) Current flows through low resistance path accidentally
41. The process of connecting an electric circuit to the earth is called
A) Earthing
B) Insulating
C) Charging
D) Magnetizing
Answer: A) Earthing
Explanation: Earthing provides a safe path for excess current to flow into the ground.
42. Earthing is important because it
A) Prevents electric shock
B) Increases current
C) Reduces voltage
D) Stops electricity
Answer: A) Prevents electric shock
43. The heating effect of electric current is used in
A) Electric iron
B) Refrigerator
C) Fan motor
D) Radio
Answer: A) Electric iron
Explanation: Electrical energy is converted into heat energy.
44. The chemical effect of electric current is used in
A) Electroplating and electrolysis
B) Fan rotation
C) Power generation
D) Lighting
Answer: A) Electroplating and electrolysis
45. The magnetic effect of electric current is used in
A) Electric bell and motors
B) Electric iron
C) Electric heater
D) Bulbs
Answer: A) Electric bell and motors
46. The heating effect of current depends on
A) Magnitude of current and time
B) Color of wire
C) Shape of wire
D) Air pressure
Answer: A) Magnitude of current and time
47. The electric bulb glows due to
A) Heating effect of current
B) Magnetic effect
C) Chemical effect
D) Static charge
Answer: A) Heating effect of current
48. The thin wire in a bulb which glows is called
A) Filament
B) Coil
C) Fuse
D) Circuit
Answer: A) Filament
49. The filament of an electric bulb is made of
A) Tungsten
B) Copper
C) Aluminium
D) Lead
Answer: A) Tungsten
Explanation: Tungsten has a high melting point and does not melt easily.
50. The process of coating a metal object with another metal using electricity is
A) Electroplating
B) Magnetizing
C) Insulating
D) Fusing
Answer: A) Electroplating
51. The device which converts electrical energy into mechanical energy is
A) Electric motor
B) Generator
C) Transformer
D) Battery
Answer: A) Electric motor
52. The device which converts mechanical energy into electrical energy is
A) Generator
B) Motor
C) Transformer
D) Cell
Answer: A) Generator
53. The device which converts electrical energy into light energy is
A) Bulb
B) Fan
C) Motor
D) Switch
Answer: A) Bulb
54. The rate at which electrical energy is consumed is called
A) Electric power
B) Electric energy
C) Current
D) Resistance
Answer: A) Electric power
55. The unit of electric power is
A) Watt
B) Volt
C) Ohm
D) Ampere
Answer: A) Watt
56. The commercial unit of electrical energy is
A) Kilowatt-hour (kWh)
B) Joule
C) Ampere-hour
D) Volt-second
Answer: A) Kilowatt-hour (kWh)
57. One kilowatt-hour of energy is equal to
A) Energy consumed by 1000-watt appliance in one hour
B) Energy used in one second
C) Power of 10-watt for one minute
D) None
Answer: A) Energy consumed by 1000-watt appliance in one hour
58. The electric meter in our house measures
A) Electrical energy used
B) Electric current
C) Voltage
D) Power
Answer: A) Electrical energy used
59. Electric fuse is used for
A) Safety of circuit from excess current
B) Increasing voltage
C) Storing energy
D) Measuring current
Answer: A) Safety of circuit from excess current
60. The fuse wire melts when
A) Current exceeds the safe limit
B) Current is very low
C) Voltage is zero
D) Wire is thick
Answer: A) Current exceeds the safe limit
61. Fuse wire has
A) Low melting point
B) High melting point
C) No resistance
D) Magnetic property
Answer: A) Low melting point
62. The device that automatically switches off when current exceeds the limit is
A) Circuit breaker (MCB)
B) Capacitor
C) Battery
D) Transformer
Answer: A) Circuit breaker (MCB)
63. MCB stands for
A) Miniature Circuit Breaker
B) Maximum Current Breaker
C) Mechanical Control Breaker
D) Magnetic Circuit Block
Answer: A) Miniature Circuit Breaker
64. In household circuits, the fuse is connected in
A) Live wire
B) Neutral wire
C) Both wires
D) Earth wire
Answer: A) Live wire
65. The color of live wire in household wiring is
A) Red or brown
B) Blue or black
C) Green
D) Yellow
Answer: A) Red or brown
66. The color of neutral wire is
A) Black or blue
B) Red
C) Green
D) Yellow
Answer: A) Black or blue
67. The color of earth wire is
A) Green
B) Red
C) Blue
D) White
Answer: A) Green
68. The flow of current through a human body can cause
A) Electric shock
B) Cooling
C) Lighting
D) Magnetism
Answer: A) Electric shock
69. Electric shock can be prevented by
A) Proper earthing
B) Overheating wires
C) Removing fuse
D) Using wet hands
Answer: A) Proper earthing
70. The heating effect of current is used in
A) Electric heater
B) Electric fan
C) Electric motor
D) Electric generator
Answer: A) Electric heater
71. The device which converts electrical energy into sound energy is
A) Loudspeaker
B) Electric heater
C) Bulb
D) Transformer
Answer: A) Loudspeaker
72. The resistance of a good conductor is
A) Very small
B) Very large
C) Zero
D) Infinite
Answer: A) Very small
73. The resistance of an insulator is
A) Very high
B) Very low
C) Zero
D) Medium
Answer: A) Very high
74. When resistors are connected in series, the total resistance
A) Increases
B) Decreases
C) Remains same
D) Becomes zero
Answer: A) Increases
75. When resistors are connected in parallel, the total resistance
A) Decreases
B) Increases
C) Becomes zero
D) Constant
Answer: A) Decreases
76. In a series circuit, the current is
A) Same through all components
B) Different
C) Half in each
D) Zero
Answer: A) Same through all components
77. In a parallel circuit, the potential difference is
A) Same across all components
B) Different
C) Zero
D) Variable
Answer: A) Same across all components
78. A device that maintains a constant potential difference is
A) Battery
B) Motor
C) Resistor
D) Inductor
Answer: A) Battery
79. The part of the circuit that converts electrical energy to other forms is called
A) Load
B) Source
C) Switch
D) Connector
Answer: A) Load
80. Electric energy is converted into heat energy in
A) Electric heater
B) Generator
C) Fan
D) Transformer
Answer: A) Electric heater
81. Electric energy is converted into light energy in
A) Electric bulb
B) Motor
C) Iron box
D) Switch
Answer: A) Electric bulb
82. Electric energy is converted into mechanical energy in
A) Motor
B) Generator
C) Cell
D) Lamp
Answer: A) Motor
83. The electric switch is used to
A) Open or close the circuit
B) Increase current
C) Store charge
D) Convert energy
Answer: A) Open or close the circuit
84. The flow of electric current in a circuit stops when
A) Circuit is open
B) Circuit is closed
C) Switch is on
D) Battery is connected
Answer: A) Circuit is open
85. The energy consumption of a household device depends on
A) Power rating and usage time
B) Color of wire
C) Shape of plug
D) Air pressure
Answer: A) Power rating and usage time
86. Electrical energy can be converted into
A) Heat, light, and motion
B) Water
C) Magnet
D) Sound only
Answer: A) Heat, light, and motion
87. An electric current produces
A) Magnetic field
B) Gravitational force
C) Nuclear energy
D) Sound wave
Answer: A) Magnetic field
88. The magnetic field around a current-carrying wire was discovered by
A) Hans Christian Oersted
B) Newton
C) Faraday
D) Edison
Answer: A) Hans Christian Oersted
89. The strength of the magnetic field around a current-carrying wire increases when
A) Current increases
B) Current decreases
C) Wire is cold
D) Air is dry
Answer: A) Current increases
90. Electric current in liquids is due to
A) Movement of ions
B) Movement of electrons
C) Movement of protons
D) Convection
Answer: A) Movement of ions
91. Pure water does not conduct electricity because
A) It has no free ions
B) It is magnetic
C) It is an acid
D) It has high resistance
Answer: A) It has no free ions
92. The addition of acid or salt to water makes it
A) Conducting
B) Non-conducting
C) Magnetic
D) Neutral
Answer: A) Conducting
93. The electric current through gases produces
A) Light and heat
B) Only heat
C) Only current
D) Only magnetism
Answer: A) Light and heat
94. The gases that conduct electricity when ionized are called
A) Plasma
B) Vapor
C) Steam
D) Air
Answer: A) Plasma
95. The electric discharge through gases is used in
A) Neon signs and fluorescent lamps
B) Electric heaters
C) Water pumps
D) Motors
Answer: A) Neon signs and fluorescent lamps
96. The electric energy used in our homes comes from
A) Power stations
B) Dry cells
C) Motors
D) Batteries only
Answer: A) Power stations
97. The electric power supplied to houses is in the form of
A) Alternating current (AC)
B) Direct current (DC)
C) Static electricity
D) Magnetic current
Answer: A) Alternating current (AC)
98. The electric current from a dry cell is
A) Direct current (DC)
B) Alternating current (AC)
C) Changing
D) Variable
Answer: A) Direct current (DC)
99. In India, the frequency of AC supply is
A) 50 Hertz
B) 60 Hertz
C) 100 Hertz
D) 40 Hertz
Answer: A) 50 Hertz
100. Electrical energy is used in daily life for
A) Lighting, heating, and operating appliances
B) Cooling air only
C) Producing noise
D) Generating gravity
Answer: A) Lighting, heating, and operating appliances