Question-Answer:

The levelling is carried out between two stations P and Q separated by 1000 m. The Back Sight (BS) reading is noted as 0.70 m on station P, whose BM is 240.00 m. Next, the Fore Sight (FS) reading is taken on an intermediate point and the value is 1.25 m. Then the instrument is shifted to a new location and BS is taken on intermediate point as 0.85 m. Finally, the FS reading is taken on station Q as 1.10 m. What is the Reduced Level of Q?

• (a) 239.20 m
  
• (b) 240.80 m
  
• (c) 241.25 m
  
• (d) 241.80 m

Ans. (a)

so R.L. of Q

POINTS	BS	FS	HI	RL
P	.7		240.7	240
INTERMEDIATE	.85	1.25	240.3	239.45
Q		1.1		239.2

239.20m

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