Carbon resistors are used extensively because they are
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The current due to electron flow in conduction band is the hole current in valence band.
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The metal having the lowest temperature coefficient of resistance is
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A perfect conductor has
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For a particular material the Hall coefficient was found to be zero. The material is
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Total number of crystal systems is
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Superconductors are becoming popular for use in
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In graphite, bonding is
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The converse of hardness is known as
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Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
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The value of critical field below the transition temperature will
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Is viscoelastic.
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Which of the following factors affect resistivity of metals ?
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By increasing impurity content in the metal alloy the residual resistivity always
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Carbon bearings are used under which of the following conditions ?
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For a hole which of the following statements is incorrect ?
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Substances whose specific resistance abruptly decreases at very low temperature are called
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The impurity atoms is semiconductors
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The photo-electric effect occurs only when the incident light has more than a certain critical
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Carbon rods are used in wet and dry cells because
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