- 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) 3 J
B) 16 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) 2 Ω
B) 0.5 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) increase
B) decrease
C) remain constant
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) 0.8 Ω
B) A. 0.2 Ω
C) 0.4 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) 0.05 Ω
B) 28.8 Ω
C) 2880 Ω
D) 20 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) 1 A
C) 3 A
D) 1.5 A
- 8. 8. Which statement best distinguishes e.m.f. from potential difference?
A) e.m.f. acts only in closed circuits
B) potential difference exists only in batteries
C) potential difference is measured in amperes
D) e.m.f. is energy supplied per unit charge by a source
- 9. 9. Which device is most likely to be non-ohmic?
A) Nichrome wire
B) Copper wire
C) Semiconductor diode
D) Constantan 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) 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) A. increases
B) decreases
C) remains constant
D) becomes zero
- 12. 12. A good electrical conductor must have
A) low resistivity
B) high resistance
C) high resistivity
D) low current
- 13. 13. If two wires have the same resistance but different materials, they must have the same
A) conductivity
B) temperature
C) resistivity
D) ratio of length to area
- 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 only
C) 1, 2 and 3
D) 1 and 3
- 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) 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) 0.5 A
B) 20 A
C) 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) 60 kWh
B) 90 kWh
C) 180 kWh
D) 120 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) 0.3 A
D) 0.6 A
- 21. 21. An electric meter reading changes from 12560 kWh to 12685 kWh. The energy consumed is
A) 25 kWh
B) 115 kWh
C) 125 kWh
D) 245 kWh
- 22. 22. Electrical energy is commercially measured using
A) energy meter
B) voltmeter
C) wattmeter
D) ammeter
- 23. 23. A fuse wire must have
A) high melting point and low resistance
B) low melting point and suitable resistance
C) high conductivity only
D) zero resistance
- 24. 24. A 13 A fuse is most appropriate for an appliance rated
A) 5000 W, 240 V
B) 1000 W, 240 V
C) 200 W, 240 V
D) 3000 W, 240 V
- 25. 25. Earthing is primarily meant to
A) protect against electric shock
B) increase resistance
C) prevent overheating
D) reduce voltage
- 26. 26. A short circuit results in
A) zero voltage
B) increased resistance
C) low current
D) excessive 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) very high resistance
C) zero resistance
D) high current
- 29. 29. If a bulb glows dimly in a circuit, possible cause is
A) open switch
B) high resistance connection
C) short circuit
D) fuse melted
- 30. 30. . A circuit breaker differs from a fuse because it
A) can be reset
B) melts
C) increases voltage
D) has zero resistance
- 31. 31. The power dissipated in a 4 Ω resistor carrying 3 A is
A) 48 W
B) 24 W
C) 36 W
D) 12 W
- 32. 32. The slope of V–I graph represents
A) charge
B) current
C) resistance
D) power
- 33. 33. The energy supplied by a 12 V battery delivering 2 A for 5 minutes is
A) 120 J
B) 7200 J
C) 720 J
D) 72000 J
|