Q1: One of the tacheometric constants is additive, the other constant, is

ANS:B - multiplying constant

Here,

D=K S+ C.
D=(f/i)s+(f+d).
Here k = (f/i) =dividing constant.
c = (f+d)=addetive constant. D = (f/i).s+ (f+d).

Where, f/i = multiplying constant.
s = staff intercept between the bottom and top hair.
f+d = Additive constant.
D = Horizontal distance between the staff station and the observer's position.