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Electric Circuits MCQs | Electric Circuits Short Questions(MCQs) & Answers

41 Which of the following is normally designed for high value of quality factor?
[A] Resistance
[B] Inductance
[C] Capacitance
[D] None of the above
Answer: Inductance
42 The resultant magnetic flux generated in the closed surface will be
[A] Zero
[B] Continuous
[C] Constant
[D] Unity
Answer: Zero

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43 Which of the following phenomenon takes place when an electromagnetic wave propagates through free space?
[A] Reflection
[B] Phase shift
[C] Attenuation
[D] Distortion
Answer: Attenuation
44 Find the change in potential energy of a system where change Q0 is carried to the charge Q1 at a distance of 10 meters with a 10 N force?
[A] 10 N/meter
[B] 100 N-meter
[C] 10 joules
[D] 50 N/meter
Answer: 100 N-meter
45 If RC is the time constant of the R-C circuit, now much time the capacitor will take to get fully charged?
[A] RC seconds
[B] 4 RC seconds
[C] 3 RC seconds
[D] 5 RC seconds
Answer: 3 RC seconds
46 Which of the following indicates the units of displacement density?
[A] Ampere-meter
[B] Coulomb-meter
[C] Coulomb/m2
[D] Volt m2
Answer: Coulomb/m2
47 Which of the following statement is true?
[A] The current in a discharging capacitor grows exponentially
[B] The current in a discharging capacitor decays exponentially
[C] The current in the discharging capacitor grows linearly
[D] The current in the discharging capacitor decreases constantly
Answer: The current in a discharging capacitor grows exponentially
48 The maximum current in the circuit of Q. 225 will be
[A] 1 A
[B] 100 A
[C] 2 A
[D] 5 A
Answer: 1 A
49 An RC circuit is shown below, the current will reach its maximum value
[A] After 1000 μ sec of turning on the switch
[B] After 500 μ sec of turning on the switch
[C] After 50 μ sec of turning on the switch
[D] Immediately after turning on the switch
Answer: Varying magnetic field
50 Which of the following condition is true for maximum transfer of power if the internal impedance of voltage source is Zs = R + jx
[A] ZL = Zs
[B] ZL = R – jx
[C] ZL = R + jx
[D] ZL = Zs/2
Answer: ZL = R – jx
51 If a neon bulb of 60 watts is connected 220 V, Ac source and draws 272 mA current, what be the resistance of the bulb filament?
[A] 1000 Ω
[B] 808 Ω
[C] 800 Ω
[D] 60 Ω
Answer: 800 Ω
52 If a night bulb is used at less brightness than rated one, which of the following method one will choose to achieve required brightness?
[A] Current-limiting resistor
[B] Potential divider
[C] Source Voltage Reduction
[D] Either (a) or (b)
Answer: Either (a) or (b)
53 A sine wave of 220 V, 50 Hz AC will achieve its negative maximum value in
[A] 10 m sec
[B] 15 m sec
[C] 20 m sec
[D] 50 m sec
Answer: 15 m sec
54 What will be the energy used by the battery if the battery has to drive 625 × 1016 electrons with potential difference of 10 V across the terminals?
[A] 5 joules
[B] 10 joules
[C] 6.25 joules
[D] 1.6 joules
Answer: 10 joules
55 In the Q. 214, the circuit (b) behaves as
[A] Current limiting source
[B] Potential divider
[C] Light limiting source
[D] None of the above
Answer: Potential divider
56 There are two circuits shown below. Which of the following statement is true?
[A] The lamp will be brightest when contact K moves to A in circuit (a)
[B] The lamp will be brightest when the contact K moves to B in circuit (a)
[C] The lamp will be brightest when contact K is moved to A the circuit (b)
[D] Circuit (a) is a potential divider
Answer: The lamp will be brightest when the contact K moves to B in circuit (a)
57 If one cycle of a.c. waveform occurs every second, what will be the frequency of this waveform?
[A] 0.2 Hz
[B] 0.5 Hz
[C] 1 Hz
[D] 2 Hz
Answer: 1 Hz
58 A circuit is shown below. What will be the steady state value of the current?
[A] 1 amp
[B] 2 amps
[C] 4 amps
[D] 5 amps
Answer: 4 amps
59 The electrical circuit A and B are shown below. Which of the battery of the flowing circuit will be loaded more and by what amount of current provided resistance of bulbs are same?
[A] A, IA = 4IB
[B] B, IA = IB
[C] A, IB = 4IA
[D] B, IA = 2IB
Answer: A, IA = 4IB
60 If the electrical current is compared to the flow of water through a pipe, which part of the pipe system is analogous to conductance ?
[A] Cross-section of the pipe
[B] Length of the pipe
[C] Pipe gradient
[D] Pipe material
Answer: Cross-section of the pipe

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