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If the electrical resistance of a typica...

If the electrical resistance of a typical substance suddenly drops to zero then the subtance is called

A

good conductors

B

super conductors

C

bad conductors

D

semi conductors

Text Solution

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The correct Answer is:
B
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MOTION-CURRENT ELECTRICITY-EXERCISE -1 (OBJECTIVE PROBLEMS NEET)
  1. A wire has non-uniform cross-section as shown in fig. steady current f...

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  2. Specific resistance of a wire depends on its

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  3. If the electrical resistance of a typical substance suddenly drops to ...

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  4. The resistance of wire is 20 Omega. The wire is stretched to three tim...

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  5. The dimensions of a mangnin block are 1 cm xx 1 cm xx100 cm The electr...

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  6. Iron and silicon wires are heated form 30^(@)C to 50^(@)C. The correct...

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  7. When the resistance of copper wire is 0.1 Omega and the radius is 1mm,...

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  8. When a resistance wire is passed through a die the cross-section area ...

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  9. In the following diagram two parallelopiped A and B are of the same th...

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  10. A conductor with rectangular cross section has dimensions (axx2axx4a) ...

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  11. A piece of copper and another of germanium are cooled from room temper...

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  12. A cylindrical copper rod is reformed to twice its original length with...

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  13. The length of a conductor is halved. Its conductance will be

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  14. The current in a metallic conductor is plotted against voltage at two ...

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  15. Net resitance between X and Y is –

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  16. Net resitance between X and Y is –

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  17. Net resitance between X and Y is –

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  18. The equivalent resistance between the terminal point P and Q is 4 Omeg...

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  19. At a point sum i=0 in a circuit with one emf source, then –

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  20. For the following circuits, the potential difference between X and Y i...

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