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A piece of copper and another of germani...

A piece of copper and another of germanium are cooled from room temperature to `80 K`. The resistance of

A

each of them increases

B

each of them decreases

C

copper increases and germanium decreases

D

copper decreases and germanium increases

Text Solution

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The correct Answer is:
D
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MOTION-CURRENT ELECTRICITY-EXERCISE -1 (OBJECTIVE PROBLEMS NEET)
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  2. A conductor with rectangular cross section has dimensions (axx2axx4a) ...

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

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

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

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

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  7. Net resitance between X and Y is –

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  8. Net resitance between X and Y is –

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  9. Net resitance between X and Y is –

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

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

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

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  13. Reading of ideal .ammeter in ampere for the following circuit is –

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  14. The equivalent resistance in series combination is

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  15. A rectangular carbon block has dimensions 1.0 cmxx 1.0 xx50 cm. (i) ...

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  16. The equivalent resistance between points (A) and (B) in the adjoining ...

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  17. Four wires of equal length and of resistance 5ohm each are connected i...

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  18. Five resistance are connected as shown in fig. The effective resistanc...

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  19. In a closed circuit, the vector sum of total e.m.f.s is equal to the s...

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  20. For the following diagram the galvanometer shows zero deflection then ...

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