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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v).

Resistivity or electrical resistivity is the inverse of electrical conductivity. Resistivity is a fundamental property of a material and it demonstrates how strongly the material resists or conducts electric current. A low resistivity is a clear indication of a material which readily allows electric current. The common representation of resistivity is by the Greek letter rho. Also, the SI unit of electrical resistivity is ohm-meter left parenthesis capital omega thin space m right parenthesis. Resistivity refers to the electrical resistance of a conductor of a particular unit cross-sectional area and unit length.

Experts can use resistivity for comparing different materials on the basis of their ability to conduct electric currents. High resistivity is the designation of poor conductors.

 

(iii) The resistivity of alloys is:
1 very low  
2 very high  
3 generally lower than its constituent metals  
4 more than resistivity of insulators  

Ans.

(2)