MCQ on Electromagnatism – 1

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 1. The curve between frequency and current is known as 
(A) voltage curve.
(B) power curve.
(C) resonance curve.
(D) load curve.

 2. Which of the following circuit element stores energy in the electromagnetic field ?
(A) Inductance.
(B) Condenser.
(C) Variable resistor.
(D) Resistance.

 3. The principle of dynamically induced emf is utilised in a
(A) choke.
(B) transformer.
(C) generator.
(D) therno-couple.

 4. A crack in the magnetic path of an inductor will result in
(A) unchanged inductance.
(B) increased inductance.
(C) zero inductance.
(D) reduced inductance.

 5. The principle of statically induced emf is utilised in a
(A) motor.
(B) transformer.
(C) generator.
(D) battery.

 6. When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
(A) increases.
(B) decreases.
(C) remains the same.
(D) doubles.

 7. The permeability of a ferromagnetic material as compared with free space is
(A) greater.
(B) lesser.
(C) same.
(D) negligible.

 8. If the magnetic susceptibility of a material is positive then the material is 
(A) para-magnetic.
(B) ferromagnetic.
(C) anti-ferromagnetic.
(D) any of the above.

 9. If the magnetic susceptibility of a material is negative then that material is 
(A) para-magnetic.
(B) dielectric.
(C) ferromagnetic.
(D) anti-ferromagnetic.

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

 11. The property of a material which opposes the magnetic flux in it is called
(A) resistance.
(B) impedance.
(C) reluctance.
(D) inductance.

 12. Cobalt is a 
(A) paramagnetic material.
(B) diamagnetic material.
(C) ferromagnetic material.
(D) none magnetic material.

 13. The emission of electrons from hot bodies is called 
(A) radiation effect.
(B) edison effect.
(C) skin effect.
(D) hall effect.

 14. Which of the following is a vector quantity?
(A) magnetic field.
(B) electric charge.
(C) energy.
(D) potential difference.

 15. The magnitude of statically induced emf depends on the 
(A) coil resistance.
(B) flux magnitude.
(C) rate of change of flux.
(D) none of the above.

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