Questions on Science
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Why do we prefer a convex mirror as a rear-view mirror in vehicles?
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What is the function of an earth wire? Why is it necessary to earth metallic appliances?
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Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
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Name some devices in which electric motors are used?
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When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
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List three sources of magnetic fields
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At the time of short circuit, the current in the circuit
(a) reduces substantially
(b) does not change
(c) increases heavily
(d) vary continuously
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The device used for producing electric current is called a
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Name two safety measures commonly used in electric circuits and appliances.
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Which sources produce alternating current?
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