150 Important Electrostatics and Capacitance MCQ Question and Answer | PDF Free Download
1.What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it?
- Ait will become magnetic
- BIt will melt
- CIt will get punctured or cracked
- DIts molecular structure will get changed
2.Which medium has the least dielectric strength?
- AParaffin wax
- BQuartz
- CGlass
- DAir
3.1 volt/meter is same as
- A1meter/coulomb
- B1 newton meter
- C1 newton/meter
- D1 joule/coulomb
4.One volt is the same as
- A1 joule / coulomb
- B1 coulomb/joule
- COne coulomb
- DOne joule
5.The capacitance between two plates increases with
- AShorter plate area and higher applied voltage
- BShorter plate area and shorter distance between them
- CLarger plate area, longer distance between plates and higher applied voltage
- DLarger plate area and shorter distance between plates
6.The capacitance c is charged through a resistance R. the time constant of the charging circuit is given by
- AC/R
- B1/RC
- CRC
- DR/C
7.The bridge used for the measurement of the value of the capacitance is
- AWein's bridge
- BWheatstone bridge
- CSchering bridge
- DHay's bridge
8.A capacitor of 80 ?F is charged to a p.d of 250 v. the charge acquired by it is
- A0.02 C
- B0.2 C
- C0.3 C
- D0.4 C
9.While checking a capacitor, if an ohm meter reading immediately goes practically to zero and stays there, then the capacitor is
- ACharged
- BShort-circuited
- CLossy
- DSatisfactory
10.Voltage applied across a dielectric produces an electrostatic fields 50 times greater than air. The dielectric constant of the dielectric will be
- A5
- B10
- C20
- D50
11.Out of the following capacitors of identical rating which one will have the smallest dimensions?
- AAluminium foil capacitor
- BMica capacitor
- CCeramic capacitor
- DPaper capacitor
12.An uncharged conductor is placed near a charged conductor, then
- AThe unchanged conductor gets charged by conduction
- BThe unchanged conductor is attracted first and then charged by induction
- CThe unchanged conductor gets charged by induction and then attracted towards the charging body
- DIt remains as such
13.The presence of an uncharged conductor near a charged one increases the
- ACharge of the charged conductor
- BCapacity of the charged conductor
- CPotential of the charged conductor
- DAll of the above
14.Paper condenser is
- AAlways polarised
- BUsually of fixed value
- CElectrolytic condenser
- DA variable condenser
15.Mica capacitors are characterised by all of the following except
- AStable operation
- BAccurate value
- CLow leakage reactance
- DLow losses
16.The ohm-meter reading of a short-circuited capacitor is
- AInfinity
- BFew kilo ohms
- CFew mega ohms
- DZero
17.Which of the following capacitors will have least energy stored in it ?
- AA 20 ?Fcapacitor charged to 400 V
- BA 20 ?Fcapacitor charged to 400 V
- CA 600 pF capacitor charged to 15 kV
- DEnergy stored in each above will be same
18.Which of the following statements is correct ?
- AMica capacitors are available in capacitance values of 5 to 20 ?F
- BAir capacitors have a black band to indicate the outside foil
- CElectrolytic capacitors must be connected in correct polarity
- DCeramic capacitors must be connected in correct polarity
19.Which of the following capacitors preferred for high frequency circuits?
- AAir capacitor
- BElectrolytic capacitor
- CMica capacitor
- DNone of the above
20.An electrolytic capacitor is generally made to provide
- ALow capacitance
- BFixed capacitance
- CVariable capacitance
- DLarge value of capacitance