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