Electrostatics MCQ

Test your knowledge with important Electrostatics MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Electrostatics MCQs at Bissoy

• The capacity of capacitor bank used in power factor correction is expressed in terms of
  ক

  kW

  খ

  kVA

  গ

  kVAR

  ঘ

  volts
• When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
  ক

  2 joules

  খ

  4 joules

  গ

  6 joules

  ঘ

  8 joules
• Permittivity is expressed in
  ক

  Farad/sq-m

  খ

  Farad/meter

  গ

  Weber/meter

  ঘ

  Weber/sq-m
• Dielectric strength of a medium is usually expressed in
  ক

  J/mm

  খ

  C/m²

  গ

  kV/mm

  ঘ

  N/mm
• The value of E within the field due to a point charge can be found with the help of
  ক

  Faraday’s laws

  খ

  Kirchhoff's laws

  গ

  Coulomb’s laws

  ঘ

  none of the above
• The number of Faraday tubes of flux passing through a surface in an electric field is called
  ক

  electric flux

  খ

  electric flux density

  গ

  magnetic flux density

  ঘ

  electric charge density
• capacitors are used in transistor circuits.
  ক

  Ceramic

  খ

  Paper

  গ

  Air

  ঘ

  Electrolytic
• Which of the following capacitors will have the least variation?
  ক

  Paper capacitor

  খ

  Ceramic capacitor

  গ

  Silver plated mica capacitor

  ঘ

  None of the above
• Mica capacitors are characterised by all of the following except
  ক

  stable operation

  খ

  accurate value

  গ

  low leakage reactance

  ঘ

  low losses
• If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will
  ক

  decrease

  খ

  increase

  গ

  remains unchanged

  ঘ

  become zero
• Capacitance increases with
  ক

  increase in plate area and decrease in distance between the plates

  খ

  increase in plate area and distance between the plates

  গ

  decrease in plate area and value of applied voltage

  ঘ

  reduction in plate area and distance between the plates
• Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them
  ক

  all in series

  খ

  all in parallel

  গ

  two in parallel and third in series with this combination

  ঘ

  two in series and third in parallel across this combination
• In a cable capacitor, voltage gradient is maximum at the surface of the
  ক

  earth

  খ

  conduction

  গ

  sheath

  ঘ

  insulator
• Which is the most superior dielectric out of the following ?
  ক

  Air

  খ

  Glass

  গ

  Bakelite

  ঘ

  Paper
• “The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface”.<br>The above statement is associated with
  ক

  Gauss’s law

  খ

  Kirchhoff's law

  গ

  Faraday’s law

  ঘ

  Lenz’s law
• "The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed".<br>The above statement is associated with
  ক

  Coulomb’s square law

  খ

  Gauss’s law

  গ

  Maxwell’s first law

  ঘ

  Maxwell’s second law
• Dielectric constant for mica is nearly
  ক

  200

  খ

  100

  গ

  3 to 8

  ঘ

  1 to 2
• The unit of dielectric strength is given by
  ক

  V/m

  খ

  V²/m

  গ

  m/V

  ঘ

  m/V²
• In the case of a lossy capacitor, its series equivalent resistance value will be
  ক

  small

  খ

  very small

  গ

  large

  ঘ

  zero
• Which of the following capacitor is preferred in case of single phase motor ?
  ক

  Mica capacitor

  খ

  Paper capacitor

  গ

  Electrolytic capacitor

  ঘ

  Ceramic capacitor
• Which of the following capacitors has relatively shorter shelf life ?
  ক

  Mica capacitor

  খ

  Electrolytic capacitor

  গ

  Ceramic capacitor

  ঘ

  Paper capacitor
• This mention statement is associated with "The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface".
  ক

  Gauss's law

  খ

  Kirchhoff's law

  গ

  Faraday's law

  ঘ

  Lenz's law
• The units of capacitance are
  ক

  $$\frac{{{\text{Volt}}}}{{{\text{Coulomb}}}}$$

  খ

  $$\frac{{{\text{Coulomb}}}}{{{\text{Volt}}}}$$

  গ

  $${\text{Ohm}}$$

  ঘ

  $$\frac{{{\text{Henry}}}}{{{\text{Wb}}}}$$
• The capacitance of a capacitor is not affected by
  ক

  distance between plates

  খ

  area of plates

  গ

  thickness of plates

  ঘ

  all of the above
• The direction of electric field due +0 positive charge is .
  ক

  away from the charge

  খ

  towards the charge

  গ

  both (A) and (B)

  ঘ

  none of the above
• Paper condenser is
  ক

  always polarised

  খ

  usually of fixed value

  গ

  electrolytic condenser

  ঘ

  a variable condenser
• An electric field line and an equipotential surface are
  ক

  Always parallel

  খ

  Always at 90°

  গ

  Inclined at any angle

  ঘ

  None of the above
• When the dielectric is homogeneous,the potential gradient is
  ক

  uniform

  খ

  non-uniform

  গ

  zero

  ঘ

  any of the above
• 1 volt/meter is same as
  ক

  1 meter/coulomb

  খ

  1 newton/meter

  গ

  1 newton/coulomb

  ঘ

  1 joule/coulomb
• The dielectric constant (relative permittivity) of glass is given by
  ক

  0.1 to 0.4

  খ

  0.5 to 1.0

  গ

  2.0 to 4.0

  ঘ

  5 to 100