Electricity MCQs with answers

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Q. The unit of e.m.f. of a cell is
  • (A) dyne
  • (B) volt
  • (C) ampere
  • (D) joule
πŸ’¬ Discuss
βœ… Correct Answer: (B) volt
Q. Kilowatt hour is the unit of
  • (A) power
  • (B) energy
  • (C) impulse
  • (D) force
πŸ’¬ Discuss
βœ… Correct Answer: (B) energy
Q. 1 kWh is equal to
  • (A) 3.6 Γ— 10^6 MJ
  • (B) 3.6 Γ— 10^5 MJ
  • (C) 3.6 Γ— 10Β² MJ
  • (D) 3.6 MJ
πŸ’¬ Discuss
βœ… Correct Answer: (D) 3.6 MJ
Q. Materials which allow larger currents to flow through them are called
  • (A) insulators
  • (B) conductors
  • (C) semiconductors
  • (D) alloys
πŸ’¬ Discuss
βœ… Correct Answer: (B) conductors
Q. Conventionally, the direction of the current is taken as
  • (A) the direction of flow of negative charge
  • (B) the direction of flow of atoms
  • (C) the direction of flow of molecules
  • (D) the direction of flow of positive charge
πŸ’¬ Discuss
βœ… Correct Answer: (D) the direction of flow of positive charge
Q. The unit of specific resistance is
  • (A) ohm
  • (B) ohm
  • (C) ohm-metre
  • (D) ohm per metre
πŸ’¬ Discuss
βœ… Correct Answer: (C) ohm-metre
Q. The variable resistance is called
  • (A) resistor
  • (B) rheostat
  • (C) open switch
  • (D) none of these
πŸ’¬ Discuss
βœ… Correct Answer: (B) rheostat
Q. The SI unit of resistance is
  • (A) ohm m
  • (B) ohm m^-1
  • (C) ohm
  • (D) (ohm)-1
πŸ’¬ Discuss
βœ… Correct Answer: (C) ohm
Q. Electric power is inversely proportional to
  • (A) resistance
  • (B) voltage
  • (C) current
  • (D) temperature
πŸ’¬ Discuss
βœ… Correct Answer: (A) resistance
Q. What is the commercial unit of electrical energy?
  • (A) Joules
  • (B) Kilojoules
  • (C) Kilowatt-hour
  • (D) Watt-hour
πŸ’¬ Discuss
βœ… Correct Answer: (C) Kilowatt-hour
Q. Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be
  • (A) greater than 3 Ω
  • (B) less than 1 Ω
  • (C) equal to 2 Ω
  • (D) between 1 Ω and 3 Ω
πŸ’¬ Discuss
βœ… Correct Answer: (B) less than 1 Ω
Q. An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
  • (A) 440 W
  • (B) 110 W
  • (C) 55 W
  • (D) 0.0023 W
πŸ’¬ Discuss
βœ… Correct Answer: (B) 110 W
Q. The resistivity of insulators is of the order of
  • (A) 10^-8 Ω^-m
  • (B) 10^1 Ω^-m
  • (C) 10^-6 Ω^-m
  • (D) 10^6 Ω^-m
πŸ’¬ Discuss
βœ… Correct Answer: (A) 10^-8 Ω^-m
Q. 1 kWh = ……….. J
  • (A) 3.6 Γ— 10^-6 J
  • (B) 13.6 Γ— 10^6 J
  • (C) 3.6 Γ— 10^6 J
  • (D) 13.6 Γ— 10^-6 J
πŸ’¬ Discuss
βœ… Correct Answer: (C) 3.6 Γ— 10^6 J
Q. The electrical resistance of insulators is
  • (A) high
  • (B) low
  • (C) zero
  • (D) infinitely high
πŸ’¬ Discuss
βœ… Correct Answer: (D) infinitely high
Q. Electrical resistivity of any given metallic wire depends upon
  • (A) its thickness
  • (B) its shape
  • (C) nature of the material
  • (D) its length
πŸ’¬ Discuss
βœ… Correct Answer: (C) nature of the material
Q. To get 2 Ω resistance using only 6 Ω resistors, the number of them required is
  • (A) 2
  • (B) 3
  • (C) 4
  • (D) 6
πŸ’¬ Discuss
βœ… Correct Answer: (B) 3
Q. The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is
  • (A) < 100 Ω
  • (B) < 4 Ω
  • (C) < 1 Ω
  • (D) > 2 Ω
πŸ’¬ Discuss
βœ… Correct Answer: (C) < 1 Ω
Q. A metallic conductor has loosely bound electrons called free electrons. The metallic conductor is
  • (A) negatively charged
  • (B) positively charged
  • (C) neutral
  • (D) Either positively charged or negatively charged
πŸ’¬ Discuss
βœ… Correct Answer: (C) neutral
Q. Calculate the current flows through the 10 Ω resistor in the following circuit.
  • (A) 1.2 A
  • (B) 0.6 A
  • (C) 0.2 A
  • (D) 2.0 A
πŸ’¬ Discuss
βœ… Correct Answer: (B) 0.6 A
Q. If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then
  • (A) R1 < R2
  • (B) R2 < R1
  • (C) R1 = R2
  • (D) R1 β‰₯ R2
πŸ’¬ Discuss
βœ… Correct Answer: (B) R2 < R1
Q. Resistivity of a metallic wise depends on
  • (A) its length
  • (B) its shape
  • (C) its thickness
  • (D) nature of material
πŸ’¬ Discuss
βœ… Correct Answer: (D) nature of material
Q. A coil in the heater consume power P on passing current. If it is cut into halves and joined in parallel, it will consume power
  • (A) P
  • (B) P/2
  • (C) 2P
  • (D) 4P
πŸ’¬ Discuss
βœ… Correct Answer: (D) 4P
Q. A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is
  • (A) 2 Γ— 10^3 joule
  • (B) 2 Γ— 10^5 joule
  • (C) 2 Γ— 10^4 joule
  • (D) 2 Γ— 10^2 joule
πŸ’¬ Discuss
βœ… Correct Answer: (B) 2 Γ— 10^5 joule
Q. A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is
  • (A) 2 A
  • (B) 4 A
  • (C) 8 A
  • (D) 16 A
πŸ’¬ Discuss
βœ… Correct Answer: (C) 8 A
Q. Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is
  • (A) current
  • (B) voltage
  • (C) resistance
  • (D) None of these
πŸ’¬ Discuss
βœ… Correct Answer: (B) voltage
Q. Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are
  • (A) each of 5 Ω
  • (B) 6 Ω and 4 Ω
  • (C) 7 Ω and 4 Ω
  • (D) 8 Ω and 2 Ω
πŸ’¬ Discuss
βœ… Correct Answer: (B) 6 Ω and 4 Ω
Q. The resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamp, when not in use?
  • (A) 48 Ω
  • (B) 400 Ω
  • (C) 484 Ω
  • (D) 48.4 Ω
πŸ’¬ Discuss
βœ… Correct Answer: (C) 484 Ω
Q. A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
  • (A) more length
  • (B) less radius
  • (C) less length
  • (D) more radius
πŸ’¬ Discuss
βœ… Correct Answer: (D) more radius
Q. A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is
  • (A) 2.5 A
  • (B) 5.0 A
  • (C) 7.5 A
  • (D) 10 A
πŸ’¬ Discuss
βœ… Correct Answer: (D) 10 A
Q. A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly
  • (A) 10^20
  • (B) 10^16
  • (C) 10^18
  • (D) 10^23
πŸ’¬ Discuss
βœ… Correct Answer: (A) 10^20
Q. What is the maximum resistance which can be made using five resistors each of 1/5 W?
  • (A) 1/5 Ω
  • (B) 10 Ω
  • (C) 5 Ω
  • (D) 1 Ω
πŸ’¬ Discuss
βœ… Correct Answer: (D) 1 Ω
Q. A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross-section
  • (A) A/2
  • (B) 3A/2
  • (C) 2A
  • (D) 3A
πŸ’¬ Discuss
βœ… Correct Answer: (C) 2A
Q. If the current I through a resistor is increased by 100 % (assume that temperature remains unchanged), the increase in power dissipated will be
  • (A) 100%
  • (B) 200%
  • (C) 300 %
  • (D) 400 %
πŸ’¬ Discuss
βœ… Correct Answer: (C) 300 %
Q. The resistivity does not change if
  • (A) the material is changed
  • (B) the temperature is changed
  • (C) the shape of the resistor is changed
  • (D) both material and temperature are changed
πŸ’¬ Discuss
βœ… Correct Answer: (C) the shape of the resistor is changed
Q. n an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be
  • (A) 5 J
  • (B) 10 J
  • (C) 20 J
  • (D) 30 J
πŸ’¬ Discuss
βœ… Correct Answer: (C) 20 J
Q. Electric potential is a:
  • (A) scalar quantity
  • (B) vector quantity
  • (C) neither scalar nor vector
  • (D) sometimes scalar and sometimes vector
πŸ’¬ Discuss
βœ… Correct Answer: (A) scalar quantity
Q. 1 mV is equal to:
  • (A) 10 volt
  • (B) 1000 volt
  • (C) 10^-3 volt
  • (D) 10^-6 volt
πŸ’¬ Discuss
βœ… Correct Answer: (C) 10^-3 volt
Q. Coulomb is the SI unit of
  • (A) charge
  • (B) current
  • (C) potential difference
  • (D) resistance
πŸ’¬ Discuss
βœ… Correct Answer: (A) charge
Q. When electric current is passed, electrons move from
  • (A) high potential to low potential.
  • (B) low potential to high potential.
  • (C) in the direction of the current.
  • (D) against the direction of the current.
πŸ’¬ Discuss
βœ… Correct Answer: (B) low potential to high potential.
Q. The heating element of an electric iron is made up of:
  • (A) copper
  • (B) nichrome
  • (C) aluminium
  • (D) iron
πŸ’¬ Discuss
βœ… Correct Answer: (B) nichrome

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Table of contents

  1. The unit of e.m.f. of a cell is
  2. Kilowatt hour is the unit of
  3. 1 kWh is equal to
  4. Materials which allow larger currents to flow through them are called
  5. Conventionally, the direction of the current is taken as
  6. The unit of specific resistance is
  7. The variable resistance is called
  8. The SI unit of resistance is
  9. Electric power is inversely proportional to
  10. What is the commercial unit of electrical energy?
  11. Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the t
  12. An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the b
  13. The resistivity of insulators is of the order of
  14. 1 kWh = ……….. J
  15. The electrical resistance of insulators is
  16. Electrical resistivity of any given metallic wire depends upon
  17. To get 2 Ω resistance using only 6 Ω resistors, the number of them required is
  18. The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is
  19. A metallic conductor has loosely bound electrons called free electrons. The metallic conductor is
  20. Calculate the current flows through the 10 Ω resistor in the following circuit.
  21. If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then
  22. Resistivity of a metallic wise depends on
  23. A coil in the heater consume power P on passing current. If it is cut into halves and joined in para
  24. A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10
  25. A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two point
  26. Two devices are connected between two points say A and B in parallel. The physical quantity that wil
  27. Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in pa
  28. The resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the r
  29. A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
  30. A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. Th
  31. A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a c
  32. What is the maximum resistance which can be made using five resistors each of 1/5 W?
  33. A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another co
  34. If the current I through a resistor is increased by 100 % (assume that temperature remains unchanged
  35. The resistivity does not change if
  36. n an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6
  37. Electric potential is a:
  38. 1 mV is equal to:
  39. Coulomb is the SI unit of
  40. When electric current is passed, electrons move from
  41. The heating element of an electric iron is made up of:

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