Top 350+ Solved Electromagnetics MCQ Questions Answer
Q. The current in a metal at any frequency is due to
a. conduction current
b. displacement current
c. both conduction and displacement current
d. neither conduction nor displacement current
Q. For conductors, the free electrons will exist at
a. valence band
b. middle of valence and conduction band
c. will not exist
d. conduction band
Q. The current flowing through an insulating medium is called
a. conduction
b. convection
c. radiation
d. susceptibility
Q. Find the dielectric constant for a material with electric susceptibility of 4.
a. 3
b. 5
c. 8
d. 16
Q. For a dielectric which of the following properties hold good?
a. they are superconductors at high temperatures
b. they are superconductors at low temperatures
c. they can never become a superconductor
d. they have very less dielectric breakdown voltage
Q. he magnetic field which destroys the superconductivity is called
a. diamagnetic field
b. ferromagnetic field
c. ferrimagnetic field
d. critical field
Q. The magnetic susceptibility in a superconductor will be
a. positive
b. negative
c. zero
d. infinity
Q. The superconducting materials will be independent of which of the following?
a. magnetic field
b. electric field
c. magnetization
d. temperature
Q. Which of the following is not an example of elemental solid dielectric?
a. diamond
b. sulphur
c. silicon
d. germanium
Q. The type of capacitors used in communication transmitters are?
a. electrolyte capacitor
b. variable capacitor
c. air capacitor
d. glass capacitor
Q. Which capacitors relatively costly?
a. electrolyte capacitor
b. mica capacitor
c. air capacitor
d. glass capacitor
Q. capacitors have a high leakage voltage.
a. electrolyte capacitor
b. variable capacitor
c. "c) air capacitor
d. polyester capacitor
Q. The force between two charges is 120 N. If the distance between the charges is doubled,the force will be
a. 60 n
b. 30 n
c. 40 n
d. 15 n