Question : Magnetic keepers are used to protect magnets from:
Option 1: Earth's magnetic field
Option 2: effect of other magnets
Option 3: self-demagnetisation
Option 4: demagnetisation due to heating
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Correct Answer: self-demagnetisation
Solution : The correct option is self-demagnetisation.
Magnets are shielded against self-demagnetisation by magnetic keepers. A permanent magnet's internal magnetic domains may become disorganised when subjected to an external magnetic field that is strong enough and moving in the opposite direction. This will lower the magnet's total magnetic strength. The term demagnetisation refers to this action.
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Question : The greenhouse effect is the heating up of the Earth's atmosphere which is due to:
Option 1: the ultraviolet rays
Option 2: γ-rays
Option 3: the infrared rays
Option 4: X-rays
Question : 'Greenhouse effect' means
Option 1: Cultivation of crops in a greenhouse to conserve heat
Option 2: Trapping of solar energy due to carbon dioxide gases
Option 3: Trapping of solar energy by the Earth's upper surface
Option 4: Increase of heat due to atmospheric pollution
Question : A current carrying conductor is associated with:
Option 1: a magnetic field
Option 2: an electric field
Option 3: an electromagnetic field
Option 4: an electrostatic field
Question : India's area is about ................ times larger than Pakistan's.
Option 1: 3
Option 2: 4
Option 3: 6
Option 4: 9
Question : The breaking up of the rocks on the earth's surface is called___________.
Option 1: conurbation
Option 2: weathering
Option 3: desertification
Option 4: flacking
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