| 1. | Which of the following property shows the property of ferromagnetic substances ? | |
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At low temperature ferromagnet becomes a paramagnet.
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The ferromagnetic property does not depend on temperature.
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The ferromagnetic property depends on temperature.
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At high enough temperature ferromagnet becomes a diamagnet.
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Report Question| 2. | Magnetic dipole moment is a vector quantity directed from ? | |
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west to east
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east to west
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south pole to north pole
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north pole to south pole
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| 3. | The narrowest hysterisis loop is for ? | |
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stainless steel
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perm alloy
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alnico
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cobalt steel
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| 4. | Core of electromagnets are made of ferromagnetic materials which have ? | |
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low permeability and high retentivity.
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high permeability and high retentivity
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low permeability and low retentivity
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high permeability and high retentivity.
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| 5. | Which of the following is correct about magnetic monopole ? | |
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Magnetic monopole does not exist.
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The monopole momentum increase due to increase at its distance from the field.
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Magnetic monopole have constant value of monopole momentum.
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Magnetic monopole exist.
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| 6. | Lines of force, due to earth’s horizontal magnetic field, are ? | |
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parallel and straight
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elliptical
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curved lines
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concentric circles
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| 7. | The primary origin(s) of magnetism lies in ? | |
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intrinsic spin of electron.
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Pauli exclusion principle.
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None
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polar nature of molecules.
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| 8. | The magnetism of magnet is due to ? | |
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cosmic rays
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the spin motion of electron
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pressure of big magnet inside the earth
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earth
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| 9. | When the temperature of a magnetic material decreases, the magnetization ? | |
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decreases in a ferromagnetic material
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decreases in a paramagnetic material
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decreases in a diamagnetic material
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remains the same in a diamagnetic material
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| 10. | Materials suitable for permanent magnet, must have which of the following properties ? | |
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Low retentivity, high coercivity and low permeability.
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High retentivity, high coercivity and high permeability.
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Low retentivity, low coercivity and low permeability.
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High retentivity, low coercivity and high permeability.
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