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Solution


Q.

Electrical resistivity of an alloy of copper and nickel is _______ when compared with the electrical resistivity of an alloy of copper, manganese and nickel.
1 same  
2 double  
3 more  
4 less  

Ans.

(3)

Electrical resistivity of an alloy of copper and nickel is more when compared with the electrical resistivity of an alloy of copper, manganese, and nickel. The electrical resistivity of Cu-Ni alloys with increasing temperature rises steeply. At 200°C, the electrical resistivity of Cu-Ni alloy is 49×10-8Ω.m whereas that of copper, manganese, and nickel is49×10-8Ω.m