Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 4 MΩ
 32 MΩ
 16 MΩ
 8 MΩ

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in different units
 actual value of quantity /base value of quantity in same units
 base value of quantity /actual value of quantity in different units
 base value of quantity /actual value of quantity in same units

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