150 Important Electrostatics and Capacitance MCQ Question and Answer | PDF Free Download
1.Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant?
- A50
- B100
- C150
- D200
2.Which of the following statement is correct?
- AAir capacitor have a black band to indicate the outside foil
- BElectrolytic capacitor must be connected in correct polarity
- CCeramic capacitors must be connected in the correct polarity
- DMica capacitors are available in capacitance value of 1 to 10 ?F
3.The dissipation factor of a good dielectric is of the order of
- A0.0002
- B0.002
- C0.02
- D0.2
4.?The total electric flux through any closed surface surrounding charges is equal to the amount of charged enclosed?. The above statement is associated with
- ACoulomb?s square law
- BGauss?s law
- CMaxwell?s first law
- DMaxwell?s second law
5.Three capacitor each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them
- AAll in series
- BAll in parallel
- CTwo in parallel and third in series with this combination
- DTwo in series and third is parallel across this combination
6.For which of the following parameter variation, the capacitance of the capacitor remains unaffected?
- ADistance between plates
- BArea of the plates
- CNature of dielectric
- DThickness of the plates
7.Which of the following statement is true?
- AThe current in the discharging capacitor grows linearly
- BThe current in the discharging capacitor grows exponentially
- CThe current in the discharging capacitor decays exponentially
- DThe current in the discharging capacitor decreases constantly
8.Which of the following material has least value of dielectric constant?
- ACeramics
- BOil
- CGlass
- DPaper
9.In a capacitor, the electric charge is stored in
- AMetal plates
- BDielectric
- CBoth (a) and (b)
- DNone of the above
10.Which of the following material has the highest value of dielectric constant?
- AGlass
- BVacuum
- CCeramic
- DOil
11.Which of the following capacitors will have the least variation?
- APaper capacitor
- BCeramic capacitor
- CSilver plated mica capacitor
- DNone of the above
12.Which of the following statements is incorrect?
- AThe leakage resistance of ceramic capacitors is generally high
- BThe stored energy in a capacitor decreases with reduction in value of capacitance
- CThe stored energy in a capacitor increases with applied voltage
- DA wire cable has distributed capacitance between the conductors
13.Which of the following capacitors has relatively shorter self-life?
- AMica capacitor
- BElectrolytic capacitor
- CCeramic capacitor
- DPaper capacitor
14.The sparking between two electrical contacts can be reduced by inserting a
- ACapacitor in parallel with contacts
- BCapacitor in series with each contacts
- CResistance in line
- DNone of the above
15.In the case of lossy capacitor, its series equivalent resistance value will be
- Asmall
- BVery small
- CLarge
- DZero
16.The power dissipated in a pure capacitor is
- AZero
- BProportional to applied voltage
- CProportional to value of capacitance
- DBoth (b) and (c)
17.In a capacitor circuit
- AA steady value of applied voltage causes discharge
- BAn increase in applied voltage makes a capacitor charge
- CDecrease in applied voltage makes a capacitor charge
- DNone of the above
18.When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will
- ARemain unchanged
- BDecrease
- CIncrease
- DBecome zero
19.Capacitance increase with
- AIncrease in plate area and decrease the distance between the plates
- BIncrease in plate area and distance between the plates
- Cdecrease in plate area and value of the applied voltage
- Dreduction in plate area and distance between the plates
20.A capacitor consists of
- Atwo insulator separated by a conductor
- Btwo conductor separated by an insulator
- Ctwo insulators only
- Dtwo conductors only