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

Questions
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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