MCQ on Magnetism and Electromagnetism - Set 09 - ObjectiveBooks

MCQ on Magnetism and Electromagnetism - Set 09

Practice Test: Question Set - 09


1. Indicate which of the following material does not retain magnetism permanently.
    (A) Soft iron
    (B) Stainless steel
    (C) Hardened steel
    (D) None of the above

2. The ratio of intensity of magnetization to the magnetization force is known as
    (A) Flux density
    (B) Susceptibility
    (C) Relative permeability
    (D) None of the above

3. Which of the following is not a unit of flux?
    (A) Maxwell
    (B) Tesla
    (C) Weber
    (D) All of the above

4. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity
    (A) Less than that of disc but in opposite direction
    (B) Equal to that of disc and in the same direction
    (C) Equal to that of disc and in the opposite direction
    (D) Less than that of disc and in the same direction

5. A permeable substance is one
    (A) Which is a good conductor
    (B) Which is a bad conductor
    (C) Which is a strong magnet
    (D) Through which the magnetic lines of force can pass very easily

6. A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?
    (A) Decreases
    (B) Increases
    (C) Remains same
    (D) First increases and then decreases depending on the depth of iron insertion

7. Temporary magnets are used in
    (A) Loudspeakers
    (B) Generators
    (C) Motors
    (D) All of the above

8. Ampere-turn is the unit of magneto-motive force (mmf).
    (A) True
    (B) False

9. Which of the following is expected to have the maximum permeability?
    (A) Brass
    (B) Copper
    (C) Zinc
    (D) Ebonite

10. The magnetic reluctance of a material
    (A) Decreases with increasing cross sectional area of material
    (B) Increases with increasing cross-sectional area of material
    (C) Does not vary with increasing cross-sectional area of material
    (D) Any of the above

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