Basic Electricity
1. Which machine converts mechanical energy into electrical energy?
A : Battery
B : Generator
C : Heater
D : Iron box
2. Which is the unit of current?
A : Ampere
B : Volt
C : Ohm
D : Watt
3. Which is the unit of resistance?
A : Ampere
B : Volt
C : Ohm
D : Watt
4. What is the flow of electrons in any conductor?
A : Voltage
B : Current
C : Resistance
D : Power
5. Which property of a substance is opposing the flow of electric current?
A : Current
B : Voltage
C : Resistance
D : EMF
6. Which is very good conductor?
A : Copper
B : Cast iron
C : Wrought iron
D : Steel
7. Which is mineral insulator?
A : Glass
B : Quartz
C : Mica
D : Porcelain
8. What is the total resistance if three resistances of 3 ohms, 9 ohms and 5 ohms are connected in series?
A : 11 ohms
B : 7 ohm
C : 17 ohms
D : 1/17 ohms
9. What is the total resistance if two resistances of 4 ohms and 6 ohms are connected in parallel?
A : 2.4
B : 3.4
C : 4.4
D : 1.4
10. What is the total resistance if three resistances of 4 ohms, 6 ohms and 8 ohms respectively are connected in parallel?
A : 24
B : 13
C : 1.84
D : 1.90
11. Which is same in series connection of resistors in a circuit?
A : Current
B : Voltage
C : Resistance
D : Power
12. Which law states that at constant temperature the current passing through a closed circuit is directly proportional to the potential difference and inversely proportional to the resistance?
A : Ohm´s law
B : Lenz´s law
C : Newton´s law
D : Hooke´s law
13. What is the resistance? I = 11.5 Amps, V = 380 Volts, R = __Ohms
B : 23 ohms
C : 33 ohms
D : 43 ohms
14. What is the current? R = 50 Ohms, V=220 Volts, I =__Amps
B : 4.2 Amps
C : 4.3 Amps
D : 4.4 Amps
15. What is the voltage? R = 250 Ohms, I = 0.44 Amps, V =__Volts
B : 105 Volts
C : 108 Volts
D : 110 Volts
16. Which statement is correct according to ohm´s law?
A : I = 1/V
B : I = R
C : I = V/R
D : I = R/V
17. What is the filament resistance if a 6 volt bulb draws a current of 0.5 Amps?
A : 12 W
B : 10 W
C : 3 W
D : 1.2 W
18. How much watt second in 1 watt hour?
A : 1000 watt sec
B : 2000 watt sec
C : 3600 watt sec
D : 4000 watt sec
19. What is the power if an emf of one volt causes a current flow of 1ampere?
A : 1 watt
B : 1 kilowatt
C : 1 HP
D : 1 Kilowatt hour
20. Which is equal to electric power?
A : R²I watts
B : I²R watts
C : IR watts
D : IV watts
21. How much power does it consumes if an electric heater draws a current of 10 amps at 200 volts?
A : 2000 watts
B : 2010 watts
C : 2020 watts
D : 2030 watts
22. What is the resistance of an electric iron if the rating of electric iron is 220 V and 500 watts?
A : 94.8 ohms
B : 95.8 ohms
C : 96.8 ohms
D : 97.8 ohms
23. What is the voltage of the immersion heater? P = 500 watts, I = 2.27 Amps, V =__Volts
B : 210.3 volts
C : 220.3 volts
D : 230.3 volts
24. What is the unit of intensity of magnetic field?
A : wb/m
B : m/wb
C : Hertz
D : Coloumb
25. Which law states about electromagnetic induction?
A : Ohm´s law
B : Hooke´s law
C : Lenz´s law
D : Faraday´s law
26. What is the formula for induced emf?
A : B²L sinθ volts
B : BL sinθ volts
C : BLV sinθ volts
D : B²V sinθ volts
27. What does EMF stands for?
A : Electronic Magnetic Force
B : Electro Motive Force
C : Electro Magnetic Force
D : Electromated Force
28. Which is the example for statically induced emf?
A : Generator
B : Motor
C : Transformer
D : Refrigerator
29. Which is the example for dynamically induced Emf?
A : Motor
B : Generator
C : Car
D : Motor bike
30. Which is the unit electrical power?
A : Volts
B : Ohms
C : Watts
D : Ampere
31. What is the current Flow in the bulb? P = 550 watts, R = 22 Ohms, I =__Amps
B : 3 Amps
C : 4 Amps
D : 5 Amps
32. What is the power required? I = 0.455 Amps, R = 484 Ohms, P =__Watts
A : 98.2 watts
B : 99.2 watts
C : 100.2 watts
D : 101.2 watts
33. What is the rated power if an adjustable resistor bears the following label 1.5 k ohms/ 0.08A?
A : 9.2 watts
B : 9.4 watts
C : 9.6 watts
D : 9.8 watts
34. How much voltage will be required to illuminate a 40 watts fluorescent lamp draws a current of 0.10 amperes?
A : 390 volts
B : 395 volts
C : 400 volts
D : 405 volts
35. How many hours will take for a 100 watts bulb to consume 1 kwh energy? W = 1 Kwh, P = 100 Watts, t = __Hours
A : 10 hours
B : 12 hours
C : 18 hours
D : 24 hours
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