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