Quiz  /  Electrical Inductors Class 9 MCQ Questions With Answers

  • 1. 
    The production of a voltage across an inductor as a result of its own expanding or contracting magnetic field is called ____.

  • Flux density
  • Self-inductance
  • Counter emf
  • Faraday's second law

  • 2. 
    The ability of a capacitor to store a charge is called __________.

  • Resistance
  • Capacitance
  • Inductance
  • Dielectric constant

  • 3. 
    Which of the following is NOT a dielectric material ?

  • air
  • ceramic
  • glass
  • copper

  • 4. 
    The electrical energy consumed by a coil is stored in the form of:

  • an electrical field
  • a force field
  • an electrostatic field
  • a magnetic field

  • 5. 
    With respect to the capacitor, which relationship is true?

  • C = Q/V
  • V = C×Q
  • Q = C/V
  • Q = V/C

  • 6. 
    What is the symbol for Inductance?

  • I
  • Z
  • XL
  • L

  • 7. 
    If the capacitance of a capacitor is 47μF, and the voltage difference across the capacitor terminals is 6V, then the energy stored in that capacitor is:

  • 846×10-6Joule
  • 7.23×10-3 Joule
  • 6.76×10-5Joule
  • 5.94×10-2Joule

  • 8. 
    Capacitors are identified by which two values?

  • Farads and watts
  • Maxwells and current
  • Farads and voltage
  • Watts and henries

  • 9. 
    ------------------------ is created out of two metal plates and an insulating material called a dielectric.

  • An inductor
  • A capacitor
  • A fixed resistor
  • A variable resistor

  • 10. 
    An inductor with an inductance of 5mH is connected in series with a 20 ohm resistor.What is the time constant of the inductor?

  • 2.5 x 10^-4 s
  • 4 x 10^4 s
  • 0.1s
  • 100s

  • 11. 
    Inductance value is also affected by permeability, , cross sectional area and____________.

  • impedance
  • the alternating current
  • the number of turns
  • impedance

  • 12. 
    Which of the following is the unit of inductance?

  • Ohm
  • Henry
  • Ampere turns
  • Webers/meter

  • 13. 
    Two common inductor cores are ___________.

  • air and iron
  • carbon and copper
  • plastic and Teflon
  • desiccant and lead

  • 14. 
    How much energy is stored when 50 A flowsthrough a 20 H inductor?

  • 500 J
  • 10000 J
  • 12500 J
  • 25000 J
  • 50000 J

  • 15. 
    The center of an inductor, which is either made from insulating or conducting material is called the ____.

  • henry
  • dielectric
  • core
  • center

  • 16. 
    What is the unit of measurement for capacitance?

  • Maxwells
  • Farads
  • Henries
  • Watts

  • 17. 
    The voltage induced across an inductor as its magnetic field collapses is called ____.

  • Counter emf
  • Transition voltage
  • Reverse voltage
  • Counter voltage

  • 18. 
    What is the voltage across the plates of the capacitor if the capacitance is 10 micro Farads and the Charge stored is 30 micro Coulombs?

  • 0.333 V
  • 3 V
  • 300 V
  • 0.3 V
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