- 1. 1. A charge of 600C passes through a conductor in 5 minutes. The current in the conductor is
A) 5.0 A
B) 0.5 A
C) 2.0 A
D) 1.2 A
- 2. 2. The potential difference between two points is 24V. If 8C of charge moves between the points, the work done is
A) 16 J
B) 3 J
C) 32 J
D) 192 J
- 3. 3. A cell of e.m.f. 12V supplies a current of 2A when connected to a resistor. If the terminal voltage is 10V, the internal resistance of the cell is
A) 0.5 Ω
B) 2 Ω
C) 1 Ω
D) 6 Ω
- 4. 4. The resistance of a wire is 8 Ω at 20°C. If temperature increases, the resistance will
A) decrease
B) remain constant
C) increase
D) become zero
- 5. 5. A wire of length 2m and cross-sectional area 2 × 10⁻⁶ m² has resistivity 4 × 10⁻⁷ Ωm. Its resistance is
A) 0.4 Ω
B) 0.8 Ω
C) A. 0.2 Ω
D) 1.6 Ω
- 6. 6. A 240 V mains supply is connected to a heating coil drawing 12 A. The resistance of the coil is
A) 28.8 Ω
B) 2880 Ω
C) 20 Ω
D) 0.05 Ω
- 7. 7. A 6 Ω resistor and 3 Ω resistor are connected in series across a 9 V battery. The current in the circuit is
A) 1 A
B) 3 A
C) 2 A
D) 1.5 A
- 8. 8. Which statement best distinguishes e.m.f. from potential difference?
A) potential difference exists only in batteries
B) e.m.f. is energy supplied per unit charge by a source
C) potential difference is measured in amperes
D) e.m.f. acts only in closed circuits
- 9. 9. Which device is most likely to be non-ohmic?
A) Copper wire
B) Semiconductor diode
C) Constantan wire
D) Nichrome wire
- 10. 10. A resistor carries 4 A when connected to 10 V supply. What current will it carry when connected to 20 V supply (temperature constant)?
A) 4 A
B) 8 A
C) 16 A
D) 2 A
- 11. 11. In a parallel circuit, when one branch is disconnected, the total current
A) A. increases
B) becomes zero
C) decreases
D) remains constant
- 12. 12. A good electrical conductor must have
A) low current
B) high resistivity
C) high resistance
D) low resistivity
- 13. 13. If two wires have the same resistance but different materials, they must have the same
A) temperature
B) resistivity
C) ratio of length to area
D) conductivity
- 14. 14. Which device is commonly used to determine the resistivity of a wire?
A) Wheatstone bridge
B) Ammeter
C) Voltmeter
D) Potentiometer
- 15. 15. The resistance of a wire depends on
1. length
2. cross-sectional area
3.nature of material
A) 1 and 2
B) 1, 2 and 3
C) 1 only
D) 1 and 3
- 16. 16. If the resistivity of a material is
2×10-6Ω𝑚, its conductivity is
A) 5 ×10-6
B) 5 x 105
C) 2 × 10-5
D) 2 ×106
- 17. 17. A 5 Ω resistor is connected in series with a parallel combination of 10 Ω and 15 Ω. The total resistance is
A) 10 Ω
B) 11 Ω
C) 12 Ω
D) 30 Ω
- 18. 18. A 100 W lamp is rated 200 V. The current drawn is
A) 2 A
B) 5 A
C) 20 A
D) 0.5 A
- 19. 19. A heater rated 2 kW operates for 3 hours daily for 30 days. The energy consumed is
A) 90 kWh
B) 180 kWh
C) 120 kWh
D) 60 kWh
- 20. 20. A cell of e.m.f. 1.5 V has internal resistance 0.5 Ω. If connected to 2.5 Ω resistor, the current is
A) 0.3 A
B) 1.0 A
C) 0.6 A
D) 0.5 A
- 21. 21. An electric meter reading changes from 12560 kWh to 12685 kWh. The energy consumed is
A) 125 kWh
B) 25 kWh
C) 245 kWh
D) 115 kWh
- 22. 22. Electrical energy is commercially measured using
A) energy meter
B) voltmeter
C) ammeter
D) wattmeter
- 23. 23. A fuse wire must have
A) low melting point and suitable resistance
B) zero resistance
C) high conductivity only
D) high melting point and low resistance
- 24. 24. A 13 A fuse is most appropriate for an appliance rated
A) 3000 W, 240 V
B) 1000 W, 240 V
C) 5000 W, 240 V
D) 200 W, 240 V
- 25. 25. Earthing is primarily meant to
A) prevent overheating
B) increase resistance
C) reduce voltage
D) protect against electric shock
- 26. 26. A short circuit results in
A) increased resistance
B) zero voltage
C) excessive current
D) low current
- 27. 27. An ammeter must have
A) zero resistance
B) very low resistance
C) infinite resistance
D) high resistance
- 28. 28. A voltmeter must have
A) very low resistance
B) zero resistance
C) high current
D) very high resistance
- 29. 29. If a bulb glows dimly in a circuit, possible cause is
A) high resistance connection
B) fuse melted
C) short circuit
D) open switch
- 30. 30. . A circuit breaker differs from a fuse because it
A) has zero resistance
B) melts
C) increases voltage
D) can be reset
- 31. 31. The power dissipated in a 4 Ω resistor carrying 3 A is
A) 12 W
B) 36 W
C) 48 W
D) 24 W
- 32. 32. The slope of V–I graph represents
A) current
B) power
C) charge
D) resistance
- 33. 33. The energy supplied by a 12 V battery delivering 2 A for 5 minutes is
A) 720 J
B) 7200 J
C) 72000 J
D) 120 J
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