Electromagnetism mcq questions answers part1

Q1. The scientist who discovered that a current-carrying conductor would move when placed in a magnetic field?
(A) Michael Faraday
(B) Robert Kirchhoff
(C) Andre Ampere
(D) Lenz

Q2. The total number of magnetic lines of force in a magnetic field is called
(A) Magnetic flux
(B) Magnetic potential
(C) Magnetic flux intensity
(D) Magnetic flux density

Q3. Two parallel plates are separated by a distance D charged by V volt. The field intensity E is given by,
(A) V × D
(B) V / D
(C) V × D²
(D) V x D²

Q4. VSWR for an ideal Antenna is
(A) 0
(B) infinite
(C) 1
(D) Zo

Q5. VSWR for an ideal antenna is
(A) 0
(B) 1
(C) zo
(D) 2

Q6. Wave guides are generally made of
(A) Cast iron or steel
(B) White metal or gun metal
(C) bronze or aluminum
(D) plastic or Bakelite

Q7. What is the value of total electric flux coming out of a closed surface?
(A) Zero
(B) Equal to total charge enclosed by the surface
(C) Equal to the surface charge density
(D) Equal to volume change density

Q8. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
(A) Statically induced emf
(B) Dynamically induced emf
(C) Self induced emf
(D) Mutually induced emf

Q9. When electromagnetic waves are propagated in a waveguide
(A) they travel along the walls of the waveguide
(B) they travel through the dielectric without touching the walls
(C) they are reflected from the walls but do not travel along the walls
(D) none of above

Q10. When electromagnetic waves are propagated in a waveguide
(A) Travel along the border walls of waveguides
(B) Are reflected from the walls but do not travel along them
(C) Travel through dielectric without touching them
(D) Travel along all four walls

Q11. When polarization of receiving antenna is unknown, to ensure that it receives at least half power, the transmitted wave should be:
(A) Vertically polarized
(B) Horizontally polarized
(C) Circularly polarized
(D) Elliptically polarized

Q12. Whenever a conductor cuts magnetic flux, an emf is induced in it. This is known as
(A) Faraday’s law
(B) Ampere’s Law
(C) Coulomb’s Law
(D) Lenz law

Q13. Whenever a flux inking a coil or current changes, an emf is induced in it. This is known as
(A) Faraday’s first law of electromagnetic induction
(B) Faraday’s second law of electromagnetic induction
(C) Coulomb’s Law
(D) Lenz law

Q14. Which of the following statement are incorrect?
(A) In a liner dielectric P varies linearly with E
(B) A dielectric material is liner if ε does not change with applied field
(C) A dielectric material is isotropic if &elipson; does not change with direction
(D) A conductor is an equipotential body and E is always tangential to the conductor

Q15. the condition for a distortionless transmission line is
(A) LG=RC
(B) LR=GC
(C) LC=GC
(D) none of the above

Q16. the intrinsic impedance of free space is..... ohms
(A) 75
(B) 0
(C) 50
(D) 377

Q17. the ratio between flux density produced in a material to the flux density produced in air.
(A) Coercivity
(B) Susceptibility
(C) Reluctance
(D) permeability

Q18. the reflection coefficient on a lossless line with a short circuit load is given by
(A) 1
(B) -1
(C) 0
(D) 10

Q19. wave guides are generally made of
(A) gold
(B) bronze or aluminum
(C) pvc
(D) hdpe

Q20. what is divergence of electric field ?
(A) 1
(B) infinity
(C) 0
(D) none of the above