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UPSC Civil Service Exam Questions - Engineering

Q1:

What is the actual ground area covered by a 20 cm x 20 cm size vertical aerial photograph, at an average scale of 1 cm = 200 m having 60% forward overlap and 30% side overlap ?

A 1.92 km2

B 4.48 km2

C 6.72 km2

D 2.88 km2

ANS:B - 4.48 km2

L= l(1-le)*s = 20(1-.6)*200= 1600m = 1.6 km
W=:20(1-.3)*200= 2800m= 2.8km
A = L * W = 1.6* 2.8= 4.48 km^.