AMIE INDIA Students Forum

[shashi118]

Multiple Choice Questions’ Bank:
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
11. Magnetic susceptibility para-magnetic materials is
(a) +10-5 (b) -10-5 (c) 105 (d) 10-5 to 10-2
12. Magnetic susceptibility dia--magnetic materials is
(a) +10-5 (b) -10-5 (c) 105 (d) 10-5 to 10-2
13. Magnetic susceptibility ferro-magnetic materials is
(a) +10-5 (b) -10-5 (c) 105 (d) 10-5 to 10-2
14. Typical size of magnetic domains ______ (mm).
(a) 1-10 (b) 0.1-1 (c) 0.05 (d) 0.001
15. Typical thickness of Bloch walls ______ (nm).
(a) 0.1-1 (b) 1-10 (c) 10-50 (d) 100
16. Example for soft magnet
(a) 45 Permalloy (b) CrO2 (c) Fe-Pd (d) Alnico
17. Example for hard magnet
(a) 45 Permalloy (b) CrO2 (c) Fe-Pd (d) Alnico
18. Example for magnetic material used in data storage devices
(a) 45 Permalloy (b) CrO2 (c) Cunife (d) Alnico
Answers:
1. b
2. a
3. b
4. d
5. c
6. a
7. b
8. c
9. a
10. d
11. d
12. b
13. c
14. c
15. d
16. a
17. d
18. b

[kavitha suresh]

Hi,

Lot of thanks for your post. It is really wonderful.

Kavitha