Electrostatics Mcqs – (Electrical Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
“ Electrostatics Mcqs “. Tab this page to check “Latest Electrostatics MCQs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Electrostatics in past papers. Past papers of Electrostatics mcqs. Past papers of Electrostatics MCQs. Mcqs are the necessary part of any competitive / job related exams. The Electrostatics mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Electrostatics mcqs. The Important series of Electrostatics Mcqs are given below:
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
A. lossy
B. short-circuited
C. charged
D. satisfactory
The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________?
A. 1/RC
B. CIR
C. RC
D. RIC
Mica capacitors are characterized by all of the following except___________?
A. accurate value
B. stable operation
C. low leakage reactance
D. low losses
An uncharged conductor is placed near a charged conductor, then_____________?
A. it remains as such
B. the uncharged conductor gets charged by induction and then attracted towards the charging body
C. the uncharged conductor is attracted first and then charged by induction
D. the uncharged conductor gets charged by conduction
Paper condenser is___________?
A. electrolytic condenser
B. usually of fixed value
C. always polarised
D. a variable condenser
Out of the following capacitors of identical rating which one will have the smallest dimensions ___________ ?
A. Aluminium foil capacitor
B. Paper capacitor
C. Ceramic capacitor
D. Mica capacitor
The presence of an uncharged conductor near a charged one increases the__________?
A. potential of the charged conductor
B. capacity of the charged conductor
C. charge of the charged conductor
D. all of the above
Which of the following statements is correct ?
A. Air capapitors have a black band to indicate the outside foil
B. Mica capacitors are available in capacitance values of 5 to 20 uF
C. Electrolytic capacitors must be connected in correct polarity
D. Ceramic capacitors must be connected in correct polarity
For a good 0.05 uF capacitor ohmmeter reading should___________?
A. show low resistance momentarily and back off to a very high resistance
B. go quickly to 50 ohm approximately and remain there
C. show high resistance momentarily and then a very low resistance
D. not move at all
The ohmmeter reading for a short circuited capacitor is____________?
A. few kilo ohms
B. infinity
C. few megohms
D. zero
An electrolytic capacitor is generally made to provide__________?
A. fixed capacitance
B. low capacitance
C. variable capacitance
D. large value of capacitance
A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?
A. 5 times greater than before
B. 5 times smaller than before
C. 10 times greater than before
D. 25 times larger than before
A condenser suitable for D.C. only is________?
A. metallic paper capacitor
B. metallic plate variable gang condenser
C. oil impregrated paper condenser
D. poled aluminium electrolytic condenser
Which of the following capacitor is preferred in case of single phase motor ?
A. Paper capacitor
B. Mica capacitor
C. Electrolytic capacitor
D. Ceramic capacitor
When a dielectric is placed in an electric field the field strength____________?
A. decreases
B. reduces to zero
C. increases
D. remain unchanged
A charge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________?
A. pico-coulomb
B. micro-coulomb
C. milli-coulomb
D. coulomb
If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?
A. move out of the field of influence of the two charges
B. remain in stable equilibrium
C. be in unstable equilibrium
D. not be in equilibrium
Which of the following capacitors preferred for high frequency circuits ?
A. Electrolytic capacitor
B. Air capacitor
C. Mica capacitor
D. none of the above
In order to remove static electricity from machinery___________?
A. insulate the machinery
B. construct insulated cabins
C. ground the framework
D. humidify the surroundings
A region around a stationary electric charge has__________?
A. an electric field
B. a magnetic field
C. both of the above
D. none of the above
Dielectric strength of a medium is usually expressed in____________?
A. C/m2
B. J/mm
C. kV/mm
D. N/mm
Which is the most superior dielectric out of the following ?
A. Glass
B. Air
C. Bakelite
D. Paper
To prevent the generation of static charges on rubber or flat leather__________?
A. oil compound dressing is done
B. conductive dressing is done
C. surface is moistened
D. talcum powder is sprayed on the surface
A capacitance is a circuit component that opposes the change in circuit__________?
A. impedance
B. Voltage
C. Current
D. None of the above
In a capacitor, the electric charge is stored in_________?
A. dielectric as well as metal plates
B. dielectric
C. metal plates
D. none of the above
The minimum value of potential gradient in a cable occurs in____________?
A. insulation
B. outer sheath
C. conductor
D. uniformly all over
Dielectric strength of medium____________?
A. increases with moisture content
B. increases with rise in temperature
C. is same for all insulating materials
D. none of the above
A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________?
A. 100 kV/m
B. 5 kV/m
C. 10 kV/m
D. 2 kV/m
Electrostatics Mcqs
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ?
A. It will melt
B. It will become magnetic
C. It will get punctured or cracked
D. Its molecular structure will get changed
A capacitor consists of two____________?
A. insulators separated by a dielectric
B. ceramic plates and one mica disc
C. silver-coated insulators
D. conductors separated by an insulator
The time constant and R-C circuit may also be defined as the time during which the charging current falls to ________ percent of its initial maximum value
A. 37
B. 63
C. 42
D. 73
At a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ?
A. Electric intensity
B. Electric flux
C. Magnetic flux density
D. None of the above
A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?
A. 82 x 105 V/m
B. 72 x 105 V/m
C. 62 x 105 V/m
D. 92 x 105 V/m
capacitors are used for audio frequency and radio frequency coupling and tuning ?
A. Plastic film
B. Mica
C. Air
D. Ceramic
The units of volume charge density are___________?
A. Coulomb/meter
B. Coulomb/meter
C. Coulomb/meter
D. Coulomb/meter
Which of the following capacitors will have the least value of breakdown voltage________ ?
A. Paper
B. Mica
C. Ceramic
D. Electrolytic
Which capacitor will be physically smaller for the same ratings ___________?
A. Ceramic capacitor
B. Paper capacitor
C. Both of the above
D. None of the above
A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance _______?
A. Ceramic capacitor
B. Mica capacitor
C. Both
D. It depends on applied voltage
The capacity of capacitor bank used in power factor correction is expressed in terms of____________?
A. kVA
B. kW
C. kVAR
D. volts
The relative permittivity of free space is given by__________?
A. 1
B. 100
C. 10
D. 1000
A gang condenser is a____________?
A. ceramic capacitor
B. variable capacitor
C. polarised capacitor
D. none of the above
The unit of capacitance is__________?
A. ohm
B. henry
C. farad
D. farad/m
Air capacitors are generally available in the range_________?
A. 10 to 400 pF
B. 100 to 900 pF
C. 1 to 20 pF
D. 20 to 100 pF
A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be_____________?
A. 100 nF
B. 10 uF
C. 10 F
D. 1000 uF
Capacitance increases with_____________?
A. increase in plate area and decrease in distance between the plates
B. decrease in plate area and value of applied voltage
C. increase in plate area and distance between the plates
D. reduction in plate area and distance between the plates
In a capacitive circuit___________?
A. decrease in applied voltage makes a capacitor charge
B. an increase in applied voltage makes a capacitor charge
C. a steady value of applied voltage causes discharge
D. none of the above
The dissipation factor of a good dielectric is of the order of____________?
A. 0.0002
B. 0.02
C. 0.002
D. 0.2
Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them_____________?
A. all in parallel
B. all in series
C. two in parallel and third in series with this combination
D. two in series and third in parallel across this combination
The sparking between two electrical contacts can be reduced by inserting a___________?
A. capacitor in parallel with contacts
B. resistance in line
C. capacitor in series with each contact
D. none of the above
Which of the following statements is incorrect _________________?
A. The stored energy in a capacitor increases with applied voltage
B. The stored energy in a capacitor decreases with reduction in value of capacitance
C. The leakage resistance of ceramic capacitors is generally high
D. A wire cable has distributed capacitance between the conductors
In the case of a lossy capacitor, its series equivalent resistance value will be_______________?
A. very small
B. small
C. large
D. zero
Which of the following capacitors has relatively shorter shelf life____________?
A. Ceramic capacitor
B. Electrolytic capacitor
C. Mica capacitor
D. Paper capacitor
Which of the following expression is correct for electric field strength___________?
A. E = D/E
B. E = jtD
C. E = D2/t
D. E= nD2
Which of the following statement is true __________?
A. The current in the discharging capacitor decays exponentially
B. The current in the dicharging capacitor grows exponentially
C. The current in the discharging capacitor grows linearly
D. The current in the discharging capacitor decreases constantly
Which of the following materials has the highest value of dielectric constant___________?
A. Vacuum
B. Glass
C. Ceramics
D. Oil
For which of the following parameter variation, the capacitance of the capacitor remains unaffected ____________?
A. Area of the plates
B. Distance between plates
C. Nature of dielectric
D. Thickness of the plates
Which of the following capacitors will have the least variation ____________?
A. Ceramic capacitor
B. Paper capacitor
C. Silver plated mica capacitor
D. None of the above
In a capacitor the electric charge is stored in____________?
A. metal plates
B. dielectric
C. both of the above
D. none of the above
“The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed”. The above statement is associated with____________?
A. Maxwell’s first law
B. Gauss’s law
C. Coulomb’s square law
D. Maxwell’s second law
Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the____________?
A. charge on the capacitor decreases
B. voltage across the plates decreases
C. Voltage across the plates increases
D. charge on the capacitor increases
Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ________?
A. 150
B. 100
C. 50
D. 200
Which of the following statements is correct ___________?
A. Ceramic capacitors must be connected in the correct polarity
B. Electrolytic capacitor must be connected in the correct polarity
C. Air capacitors have a black band to indicate the outside foil
D. Mica capacitors are available in capacitance value of 1 to 10 pF
If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because__________________?
A. varying voltage produces the charging and dicharging currents
B. charging current can flow
C. of high peak value
D. discharge current can flow
A dielectric material must be____________?
A. good conductor
B. insulator
C. resistor
D. semi conductor
The capacitance of a capacitor is not affected by____________?
A. area of plates
B. distance between plates
C. thickness of plates
D. all of the above
The units of capacitance are____________?
A. ohms
B. coulombs/volt
C. volts/coulomb
D. henry/Wb
If three 10 uF capacitors are connected in parallel, the net cararitance is___________?
A. 40 uF
B. 30 uE
C. 20 uF
D. 50 uF
An electrolytic capacitor can be used for_____________?
A. D.C. only
B. AC. only
C. both of the above
Which of the following is not a vector ___________?
A. Electric field
B. Angular momentum
C. Linear momentum
D. Electric potential
The lines of force due to charged particles are_________?
A. sometimes curved
B. always curved
C. always straight
D. none of the above
If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will__________?
A. remains unchanged
B. increase
C. decrease
D. become zero
A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is___________?
A. 0.024 F
B. 0.6 F
C. 0.12 F
D. 0.8 F
If three 15 uF capacitors are connected in series, the net capacitance is
A. 5 uF
B. 45 uF
C. 30 uF
D. 50 uF
A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is_____________?
A. 0.024 F
B. 0.6 F
C. 0.12 F
D. 0.8 F
The direction of electric field due +0 positive charge is ___________?
A. away from the charge
B. towards the charge
C. both of the above
D. none of the above
The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be______________?
A. 600 N/C
B. 400 N/C
C. 800 N/C
D. 1200 N/C
The electric field at a point situated at a distance d from straight charged conductor is____________?
A. inversely proportional to d
B. inversely proportional to d
C. proportional to d
D. none of the above
A field line and an equipotential surface are____________?
A. inclined at any angle 0
B. always at 90°
C. always parallel
D. none of the above
The force between two charges is 120 N. If the distance between the charges is doubled, the force will be________________?
A. 40 N
B. 30 N
C. 60 N
D. 15 N
The ability of charged bodies to exert force on 6ne another is attributed to the existence of____________?
A. protons
B. electrons
C. neutrons
D. electric field
For making a capacitor, it is better to select a dielectric having___________?
A. permittivity same as that of air
B. high permittivity
C. low permittivity
D. permittivity slightly more than that of air