| 1. | Which of the following is a ferromagnetic material ? | |
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Tungsten
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Aluminium
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Copper
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Nickel
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Report Question| 2. | Paramagnetic materials have relative permeability ? | |
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slightly less than unity
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equal to unity
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slightly more than unity
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equal to that ferromagnetic materials
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| 3. | The relative permeability is less than unity is case of ? | |
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ferromagnetic materials
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ferrites
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non-ferrous materials
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diamagnetic materials
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| 4. | Main causes of noisy solenoid are ? | |
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strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
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uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts
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both of above
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none of the above
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| 5. | Ferrites are ...... materials ? | |
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paramagnetic
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diamagnetic
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ferromagnetic
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none of the above
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| 6. | Indicate which of the following material does not retain magnetism permanently ? | |
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Soft iron
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Stainless steel
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Hardened steel
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None of the above
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| 7. | The bar magnet has ? | |
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the dipole moment
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monopole moment
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(a) and (b) both
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none of the above
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| 8. | A magnetic field exists around ? | |
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iron
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copper
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aluminium
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moving charges
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| 9. | Which of the following statements is correct ? | |
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The conductivity of ferrites is better than ferromagnetic materials
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The conductivity of ferromagnetic materials is better than ferrites
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The conductivity of ferrites is very high
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The conductivity of ferrites is same as that of ferromagnetic materials
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| 10. | The Biot-savart's law is a general modification of ? | |
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Kirchhoffs law
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Lenz's law
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Ampere's law
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Faraday's laws
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