Electricity class 10 Important MCQ
Electricity class 10 Important MCQ
Introduction:
Basics of Electricity (1–20)
1. SI unit of electric current is
A. Volt
B. Ampere
C. Ohm
D. Watt
Ans: B
2. Instrument used to measure current is
A. Voltmeter
B. Galvanometer
C. Ammeter
D. Multimeter
Ans: C
3. SI unit of electric charge is
A. Coulomb
B. Ampere
C. Volt
D. Ohm
Ans: A
4. Electric current is the rate of flow of
A. Energy
B. Electrons
C. Charge
D. Voltage
Ans: C
5. 1 ampere =
A. 1 C/s
B. 1 J/s
C. 1 V/s
D. 1 Ω/s
Ans: A
6. Potential difference is measured in
A. Ampere
B. Coulomb
C. Volt
D. Ohm
Ans: C
7. Instrument used to measure potential
difference
A. Ammeter
B. Galvanometer
C. Voltmeter
D. Fuse
Ans: C
8. Device that converts chemical energy
into electrical energy
A. Generator
B. Cell
C. Motor
D. Heater
Ans: B
9. Conventional current flows from
A. Negative to positive
B. Positive to negative
C. Earth to conductor
D. Randomly
Ans: B
10. Flow of electrons is from
A. Positive to negative
B. High potential to low
C. Negative to positive
D. Neutral to charged
Ans: C
11. Resistance opposes the flow of
A. Voltage
B. Charge
C. Current
D. Energy
Ans: C
12. SI unit of resistance is
A. Volt
B. Ampere
C. Ohm
D. Watt
Ans: C
13. Symbol of resistance is
A. V
B. I
C. R
D. W
Ans: C
14. Factors affecting resistance are
A. Length
B. Area
C. Nature of material
D. All of these
Ans: D
15. Resistance increases if length of wire
A. Decreases
B. Increases
C. Remains same
D. Becomes zero
Ans: B
16. Resistance decreases when area of
cross-section
A. Decreases
B. Increases
C. Remains same
D. Becomes zero
Ans: B
17. Good conductor of electricity
A. Rubber
B. Glass
C. Copper
D. Wood
Ans: C
18. Insulator of electricity
A. Iron
B. Aluminium
C. Plastic
D. Silver
Ans: C
19. Graph between V and I for ohmic
conductor is
A. Curved
B. Zig-zag
C. Straight line
D. Circular
Ans: C
20. Slope of V–I graph gives
A. Current
B. Voltage
C. Resistance
D. Power
Ans:
C
Ohm’s Law & Numericals (21–40)
21.
Ohm’s
Law is
A. V ∝ I
B. R ∝ I
C. V ∝ R
D. I ∝ R
Ans: A
22. Mathematical form of Ohm’s law
A. V = IR
B. I = VR
C. R = VI
D. P = VI
Ans: A
23. If V = 10 V and I = 2 A, R = ?
A. 5 Ω
B. 10 Ω
C. 20 Ω
D. 2 Ω
Ans: A
24. Resistance of ideal conductor is
A. Infinite
B. Zero
C. Very high
D. Very low
Ans: B
25. Resistance of ideal insulator is
A. Zero
B. Low
C. Infinite
D. Moderate
Ans: C
26. If current doubles, resistance will
A. Double
B. Half
C. Remain same
D. Become zero
Ans: C
27. Unit of resistivity is
A. Ω
B. Ω m
C. Ω/m
D. m/Ω
Ans: B
28. Resistivity depends on
A. Length
B. Area
C. Material
D. Voltage
Ans: C
29. Copper has
A. High resistivity
B. Low resistivity
C. Zero resistivity
D. Infinite resistivity
Ans: B
30. Nichrome is used in heaters because
A. Low resistance
B. High resistance & high melting point
C. Cheap
D. High conductivity
Ans: B
31. Resistance in series combination is
A. Same
B. Maximum
C. Sum of all resistances
D. Product of resistances
Ans: C
32. In parallel combination, potential
difference is
A. Different
B. Same
C. Zero
D. Infinite
Ans: B
33. Equivalent resistance of parallel
combination is
A. Maximum
B. Minimum
C. Sum
D. Difference
Ans: B
34. Household wiring is done in
A. Series
B. Parallel
C. Mixed
D. Circular
Ans: B
35. If one bulb fuses in parallel circuit
A. All go off
B. Others glow normally
C. Circuit breaks
D. Voltage increases
Ans: B
36. Fuse is used to
A. Increase current
B. Decrease voltage
C. Prevent overloading
D. Store energy
Ans: C
37. Fuse wire is made of
A. Copper
B. Aluminium
C. Low melting point alloy
D. Steel
Ans: C
38. Electric power is measured in
A. Joule
B. Watt
C. kWh
D. Ampere
Ans: B
39. Formula of electric power
A. P = VI
B. P = IR
C. P = V/R
D. P = I/R
Ans: A
40. Commercial unit of electrical energy
A. Joule
B. Watt
C. kWh
D. Ampere
Ans: C
Electric Power & Heating Effect (41–70)
41.
1
kWh =
A. 3.6 × 10⁶ J
B. 3.6 × 10⁵ J
C. 36 × 10⁶ J
D. 360 J
Ans: A
42. Electric heater works on
A. Magnetic effect
B. Chemical effect
C. Heating effect
D. Optical effect
Ans: C
43. Heating effect of current was
discovered by
A. Ohm
B. Joule
C. Faraday
D. Newton
Ans: B
44. Joule’s law of heating: H ∝
A. I²Rt
B. IRt
C. VIt
D. RIt
Ans: A
45. Power of electric bulb is
A. 40 W
B. 60 W
C. 100 W
D. All are correct
Ans: D
46. Greater power means
A. More resistance
B. Less energy
C. More energy consumed
D. Less current
Ans: C
47. Which consumes more energy?
A. 100 W bulb for 1 hr
B. 50 W bulb for 1 hr
C. Both same
D. Depends on voltage
Ans: A
48. Filament of bulb is made of
A. Copper
B. Tungsten
C. Nichrome
D. Aluminium
Ans: B
49. Tungsten is used because
A. Low melting point
B. High resistance
C. High melting point
D. Cheap
Ans: C
50. Electric iron uses
A. Series circuit
B. Parallel circuit
C. Heating effect
D. Magnetic effect
Ans: C
51. Power rating of heater is 1000 W means
A. Uses 1000 J per second
B. Produces 1000 V
C. Uses 1000 A
D. Resistance is 1000 Ω
Ans: A
52. Which has highest resistance?
A. Thick wire
B. Thin wire
C. Short wire
D. Wide wire
Ans: B
53. Overloading occurs due to
A. High voltage
B. Short circuit
C. Many devices at once
D. All of these
Ans: D
54. Short circuit occurs when
A. Live and neutral touch
B. Voltage increases
C. Resistance increases
D. Fuse works
Ans: A
55. MCB stands for
A. Main Circuit Breaker
B. Miniature Circuit Breaker
C. Mega Circuit Board
D. Main Control Box
Ans: B
56. MCB is better than fuse because
A. Reusable
B. Faster
C. Safer
D. All
Ans: D
57. Power is zero when
A. V = 0
B. I = 0
C. Both A and B
D. R = 0
Ans: C
58. If resistance is zero, power is
A. Zero
B. Infinite
C. Maximum
D. Minimum
Ans: B
59. Electrical energy depends on
A. Power
B. Time
C. Both
D. Voltage only
Ans: C
60. Formula of electrical energy
A. E = Pt
B. E = IR
C. E = VI
D. E = Rt
Ans: A
Higher Thinking & Mixed MCQs (61–100)
61.
Wire
used in heater should have
A. Low resistance
B. High resistance
C. Zero resistance
D. Variable resistance
Ans: B
62. Current increases if
A. Resistance increases
B. Voltage decreases
C. Voltage increases
D. Length increases
Ans: C
63. Thicker wire has
A. More resistance
B. Less resistance
C. No resistance
D. Infinite resistance
Ans: B
64. SI unit of power is
A. Joule
B. Volt
C. Watt
D. Ampere
Ans: C
65. Ammeter is connected in
A. Parallel
B. Series
C. Mixed
D. Circular
Ans: B
66. Voltmeter is connected in
A. Series
B. Parallel
C. Mixed
D. Any
Ans: B
67. Electric current in metallic
conductors is due to
A. Ions
B. Protons
C. Electrons
D. Neutrons
Ans: C
68. Resistance of wire depends on
temperature because
A. Length changes
B. Area changes
C. Resistivity changes
D. Voltage changes
Ans: C
69. Power can also be written as
A. P = I²R
B. P = V²/R
C. Both
D. None
Ans: C
70. Fuse wire melts due to
A. Magnetic effect
B. Chemical effect
C. Heating effect
D. Optical effect
Ans: C
71. Unit of electric energy in SI system
A. Joule
B. kWh
C. Watt
D. Ampere
Ans: A
72. Current depends on
A. Voltage
B. Resistance
C. Both
D. Area only
Ans: C
73. Resistance of combination in series is
A. Least
B. Maximum
C. Zero
D. Infinite
Ans: B
74. Electrical appliances are connected in
parallel because
A. Same current flows
B. Same voltage available
C. Less resistance
D. Save energy
Ans: B
75. Unit of resistivity does not depend on
A. Length
B. Area
C. Material
D. Temperature
Ans: A
76. Electric shock depends on
A. Voltage
B. Current
C. Resistance
D. All
Ans: D
77. Which device converts electrical
energy into mechanical energy?
A. Generator
B. Motor
C. Transformer
D. Heater
Ans: B
78. Current in household circuit is
A. DC
B. AC
C. Pulsed
D. Variable DC
Ans: B
79. Frequency of AC supply in India
A. 60 Hz
B. 100 Hz
C. 50 Hz
D. 25 Hz
Ans: C
80. Which is NOT an electrical conductor?
A. Copper
B. Silver
C. Plastic
D. Aluminium
Ans: C
81. Which
of the following has the least resistance?
A. Long thin wire
B. Short thick wire
C. Long thick wire
D. Short thin wire
Ans: B
82. Resistance
of a conductor increases with
A. Increase in area
B. Decrease in length
C. Increase in temperature
D. Decrease in resistivity
Ans: C
83. Which
material is commonly used for making fuse
wire?
A. Copper
B. Aluminium
C. Lead-tin alloy
D. Iron
Ans: C
84. If voltage
across a conductor is doubled and resistance remains same, current will
A. Become half
B. Remain same
C. Double
D. Become zero
Ans: C
85. Unit of
electric power used in homes is
A. Watt
B. Joule
C. Kilowatt-hour
D. Ampere
Ans: C
86. Which
appliance works on heating effect of
current?
A. Electric bell
B. Electric motor
C. Electric iron
D. Generator
Ans: C
87. The heating
effect of current depends on
A. Current only
B. Resistance only
C. Time only
D. Current, resistance and time
Ans: D
88. The
resistance of a wire does NOT
depend on
A. Length
B. Area of cross-section
C. Material
D. Potential difference
Ans: D
89. Which of
the following has highest resistivity?
A. Copper
B. Aluminium
C. Nichrome
D. Silver
Ans: C
90. When
resistances are connected in series, the total resistance is
A. Less than smallest resistance
B. Equal to average
C. Greater than each resistance
D. Zero
Ans: C
91. In parallel combination of resistances,
current in each branch
A. Is same
B. Is different
C. Is zero
D. Depends on voltage only
Ans: B
92. Short circuit occurs when
A. Resistance becomes high
B. Current becomes zero
C. Live and neutral wires touch
D. Fuse melts
Ans: C
93. An MCB is
preferred over fuse because it
A. Is cheaper
B. Works slower
C. Can be reset
D. Is made of copper
Ans: C
94. Power
consumed by a device depends on
A. Voltage only
B. Current only
C. Resistance only
D. Voltage and current
Ans: D
95. If a bulb
is rated 60 W, 220 V, the
current drawn is approximately
A. 0.1 A
B. 0.27 A
C. 0.5 A
D. 1 A
Ans: B
96. Electrical
energy consumed is measured by
A. Voltmeter
B. Ammeter
C. Wattmeter
D. Energy meter
Ans: D
97. Which one
converts electrical energy into heat
energy?
A. Electric fan
B. Electric bulb
C. Electric generator
D. Electric motor
Ans: B
98. The commercial unit of electrical energy is
A. Joule
B. Watt
C. Kilowatt
D. Kilowatt-hour
Ans: D
99. Which
factor increases electric current in a circuit?
A. Increase in resistance
B. Decrease in voltage
C. Increase in voltage
D. Increase in length
Ans: C
100.
If two resistors of 2 Ω and 4 Ω are connected in
parallel, the equivalent resistance is
A. 6 Ω
B. 3 Ω
C. 1.33 Ω
D. 2 Ω
Ans: C
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