Answer:
I always thought it was so that the older wire could not have a problem and have another electrician must come back and fix it.
Explanation:
 
        
             
        
        
        
Answer:
(A) elemental, alloy, or compound thin films are deposited on to a bulk substrate
Explanation:
In film deposition there is process of depositing of material in form of thin films whose size varies between the nano meters to micrometers onto a surface. The material can be a single element a alloy or a compound.
This technology is very useful in semiconductor industries, in solar panels in CD drives etc 
so from above discussion it is clear that option (a) will be the correct answer
 
        
             
        
        
        
Answer:
Estimated number of indigenous faults remaining undetected is 6
Explanation:
The maximum likelihood estimate of indigenous faults is given by,
 here,
 here, 
 = the number of unseeded faults = 6
 = the number of unseeded faults = 6
 = number of seeded faults = 30
 = number of seeded faults = 30
 = number of seeded faults found = 15
 = number of seeded faults found = 15
So NF will be calculated as,

And the estimate of faults remaining is   = 12 - 6 = 6
 = 12 - 6 = 6