Magnetism and Electromagnetism Objective Questions and Answers - ObjectiveBooks

Magnetism and Electromagnetism Objective Questions and Answers

Practice Test: Question Set - 11


1. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle
    (A) Will be zero
    (B) Will be infinite
    (C) Will depend on the amount of e.m.f. applied
    (D) Will depend on the radius of the circle

2. The unit of relative permeability is
    (A) Henry/metre
    (B) Henry
    (C) Henry/sq. m
    (D) It is dimensionless

3. A conductor of length ‘L’ has current ‘I’ passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be
    (A) Zero
    (B) BLI
    (C) B2LI
    (D) BLI2

4. A permanent magnet
    (A) Attracts some substances and repels others
    (B) Attracts all paramagnetic substances and repels others
    (C) Attracts only ferromagnetic substances
    (D) Attracts ferromagnetic substances and repels all others

5. The materials are a bit inferior conductors of magnetic flux than air.
    (A) Ferromagnetic
    (B) Paramagnetic
    (C) Diamagnetic
    (D) Dielectric

6. The uniform magnetic field is
    (A) The field of a set of parallel conductors
    (B) The field of a single conductor
    (C) The field in which all lines of magnetic flux are parallel and equidistant
    (D) None of the above

7. Which of the following statements is correct?
    (A) The magnetic flux inside an exciting coil is lower than its outside surface
    (B) The magnetic flux inside an exciting coil is zero
    (C) The magnetic flux inside the exciting coil is greater than its outside surface
    (D) The magnetic flux inside the exciting coil is same as on its outside surface

8. Which of the following materials are diamagnetic?
    (A) Silver
    (B) Copper
    (C) Silver and copper
    (D) Iron

9. A magnetic field exists around
    (A) Iron
    (B) Copper
    (C) Aluminium
    (D) Moving charges

10. Which of the following is a vector quantity?
    (A) Relative permeability
    (B) Magnetic field intensity
    (C) Flux density
    (D) Magnetic potential

11. Magnetizing steel is normal’s difficult because
    (A) It corrodes easily
    (B) It has high permeability
    (C) It has high specific gravity
    (D) It has low permeability

12. Ferrites are a subgroup of
    (A) Nonmagnetic materials
    (B) Ferromagnetic materials
    (C) Paramagnetic materials
    (D) Ferrimagnetic materials

13. Reciprocal of permeability is
    (A) Reluctivity
    (B) Susceptibility
    (C) Permittivity
    (D) Conductance

14. The magnetic materials exhibit the property of magnetization because of
    (A) Orbital motion of electrons
    (B) Spin of electrons
    (C) Spin of nucleus
    (D) Either of these

15. The retentivity (a property) of material is useful for the construction of
    (A) Permanent magnets
    (B) Transformers
    (C) Nonmagnetic substances
    (D) Electromagnets

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