Material Science (Magnetic properties)

1. Basic source of magnetism ______________.
(a) Charged particles alone
(b) Movement of charged particles
(c) Magnetic dipoles
(d) Magnetic domains

2. Units for magnetic flux density
(a) Wb / m2
(b) Wb / A.m
(c) A / m
(d) Tesla / m

3. Magnetic permeability has units as
(a) Wb / m2
(b) Wb / A.m
(c) A / m
(d) Tesla / m

4. Magnetic permeability has units as
(a) Tesla
(b) Henry
(c) Tesla / m
(d) Henry / m

5. Magnetic field strength’s units are
(a) Wb / m2
(b) Wb / A.m
(c) A / m
(d) Tesla / m

6. Example for dia-magnetic materials
(a) super conductors
(b) alkali metals
(c) transition metals
(d) Ferrites

7. Example for para-magnetic materials
(a) super conductors
(b) alkali metals
(c) transition metals
(d) Ferrites

8. Example for ferro-magnetic materials
(a) super conductors
(b) alkali metals
(c) transition metals
(d) Ferrites

9. Example for anti-ferro-magnetic materials
(a) salts of transition elements
(b) rare earth elements
(c) transition metals
(d) Ferrites

10. Example for ferri-magnetic materials
(a) salts of transition elements
(b) rare earth elements
(c) transition metals
(d) Ferrites

Answers:
1. b
2. a
3. b
4. d
5. c
6. a
7. b
8. c
9. a
10. d

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