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Free download in PDF Electric Circuits Short Questions & Answers for competitive exams. These short objective type questions with answers are very important for competitive exams like IIT-JEE, NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
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
42
The resultant magnetic flux generated in the closed surface will be
[A]
Zero
[B]
Continuous
[C]
Constant
[D]
Unity
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
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
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
46
Which of the following indicates the units of displacement density?
[A]
Ampere-meter
[B]
Coulomb-meter
[C]
Coulomb/m2
[D]
Volt 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
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
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
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
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
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
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
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
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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