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Free download in PDF Capacitor Multiple Choice 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.
(1)
Capacitor is a device used to__________
[A]
store electrical energy
[B]
vary the resistance
[C]
store magnetic energy
[D]
dissipate energy
Answer: store electrical energy
(2)
Capacitor blocks__________ after long time.
[A]
alternating current
[B]
direct current
[C]
both alternating and direct current
[D]
neither alternating nor direct current
(3)
Which of the following is a passive device?
[A]
Transistor
[B]
Rectifier
[C]
Capacitor
[D]
Vaccuum Tubes
(4)
For which medium capacitance is high?
[A]
Air
[B]
Mica
[C]
Water
[D]
Metal
(5)
A capacitor using chemical reactions to store charge is _______
[A]
Paper capacitor
[B]
Ceramic capacitor
[C]
Polyester capacitor
[D]
Electrolyte capacitor
Answer: Electrolyte capacitor
(6)
In a variable capacitor, capacitance can be varied by ______
[A]
Turning the rotatable plates in or out
[B]
Sliding the rotatable plates
[C]
Changing the plates
[D]
Changing the material of plates
Answer: Turning the rotatable plates in or out
(7)
Capacitor preferred when there is high frequency in the circuits is _______
[A]
Electrolyte capacitor
[B]
Mica capacitor
[C]
Air capacitor
[D]
Glass capacitor
(8)
Which capacitors relatively costly?
[A]
Electrolyte capacitor
[B]
Mica capacitor
[C]
Air capacitor
[D]
Glass capacitor
(9)
A power factor of a circuit can be improved by placing which, among the following, in a circuit?
[A]
Inductor
[B]
Capacitor
[C]
Resistor
[D]
Switch
(10)
Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.
[A]
0.1 sec
[B]
0.1 msec
[C]
0.01 sec
[D]
0.01 msec
(11)
Air has a dielectric constant of ___________
[A]
Unity
[B]
Zero
[C]
Infinity
[D]
Hundred
(12)
Unit of capacitance is___________
[A]
Volts
[B]
Farad
[C]
Henry
[D]
Newton
(13)
Which among the following equations is incorrect?
[A]
Q=CV
[B]
Q=C/V
[C]
V=Q/C
[D]
C=Q/V
(14)
Capacitance is directly proportional to__________
[A]
Area of cross section between the plates
[B]
Distance of separation between the plates
[C]
Both area and distance
[D]
Neither area nor distance
Answer: Area of cross section between the plates
(15)
What will happen to the capacitor just after the source is removed?
[A]
It will not remain in its charged state
[B]
It will remain in its charged state
[C]
It will start discharging
[D]
It will become zero
Answer: It will remain in its charged state
(16)
What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge?
[A]
2F
[B]
4F
[C]
6F
[D]
8F
(17)
Capacitors charge and discharge in __________ manner.
[A]
Linear
[B]
Constant
[C]
Square
[D]
Exponential
(18)
When the supply frequency increases, what happens to the capacitive reactance in the circuit?
[A]
Increases
[B]
Decreases
[C]
Remains the same
[D]
Becomes zero
(19)
______________ capacitors have a high leakage voltage.
[A]
Electrolyte capacitor
[B]
Variable capacitor
[C]
Air capacitor
[D]
Polyester capacitor
Answer: Polyester capacitor
(20)
____________ capacitors usually have a colour code to find its value.
[A]
Electrolyte capacitor
[B]
Variable capacitor
[C]
Polyester capacitor
[D]
Glass capacitor
Answer: Polyester capacitor
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