| 1. | The magnetic susceptibility for diamagnetic materials is ? | |
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large and negative
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small and negative
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large and positive
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small and positive
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Report Question| 2. | Curie temperature is the temperature above which ? | |
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a paramagnetic material becomes ferromagnetic.
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a ferromagnetic material becomes paramagnetic.
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a paramagnetic material becomes diamagnetic.
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a ferromagnetic material becomes diamagnetic.
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| 3. | Angle of dip is 90° at ? | |
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equator.
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tropic of cancer.
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poles.
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both at equator and poles.
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| 4. | Domain formation is the necessary feature of ? | |
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ferromagnetism.
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diamagnetism.
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Paramagnetism.
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all of these.
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| 5. | A diamagnetic material in a magnetic field moves ? | |
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in random direction.
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from weaker to stronger parts.
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perpendicular to the field.
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from stronger to weaker parts.
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| 6. | A magnet can be completely demagnetised by ? | |
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dropping it into ice cold water.
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a reverse field of appropriate strength.
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heating it slightly.
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breaking the magnet into small pieces.
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| 7. | Which of the following is responsible for the earth’s magnetic field ? | |
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Translational motion of earth.
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Convective currents in earth’s core
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Rotational motion of earth.
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Diversive current in earth’s core.
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| 8. | Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator is ? | |
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always negative
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unbounded
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positive, negative or zero
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always zero
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| 9. | A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis. Of the following physical quantities the one which remains unchanged is ? | |
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magnetic moment
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intensity of magnetisation
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None of these
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pole strength
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| 10. | On cutting a solenoid in half, the field lines remain ........... emerging from one face of the solenoid and entering into the other face. ? | |
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alternate
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discontinuous
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irregular
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continuous
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