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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