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A bench mark (BM) with reduced level (RL) = 155.305 m has been established at the floor of a room. It is required to find out the RL of the underside of the roof (R) of the room using spirit leveling. The back sight (BS) to the BM has been observed as 1.500 m whereas the foresight (FS) to R has been observed as 0.575 m (staff held inverted). The RL (m) of R will be 

  • a)
    155.880

  • b)
    156.230

  • c)
    157.380

  • d)
    157.860

Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A bench mark (BM) with reduced level (RL) = 155.305 m has been establi...
In case of inverted staff,



RL of R = Height of instrument + FS



= (RL of benchmark+BS) + FS



=155.305+1.5+0.575



=157.38 m
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Most Upvoted Answer
A bench mark (BM) with reduced level (RL) = 155.305 m has been establi...
To find the reduced level (RL) of the underside of the roof (R) using spirit leveling, we need to follow a few steps:

1. Calculate the height of instrument (HI):
- HI = BM RL + BS
- HI = 155.305 m + 1.500 m
- HI = 156.805 m

2. Calculate the reduced level of the roof (R):
- RL of R = HI - FS
- RL of R = 156.805 m - 0.575 m
- RL of R = 156.230 m

Therefore, the correct answer is option 'b' - 156.230 m.

Let's break down the steps in more detail:

1. Calculate the height of instrument (HI):
- The height of instrument is the sum of the benchmark reduced level (RL) and the back sight (BS).
- The benchmark reduced level (RL) is given as 155.305 m.
- The back sight (BS) to the benchmark is given as 1.500 m.
- Adding these values together, we get:
HI = 155.305 m + 1.500 m
HI = 156.805 m

2. Calculate the reduced level of the roof (R):
- The reduced level of the roof (R) can be found by subtracting the foresight (FS) to the roof from the height of instrument (HI).
- The foresight (FS) to the roof is given as 0.575 m.
- Subtracting this value from the height of instrument (HI), we get:
RL of R = 156.805 m - 0.575 m
RL of R = 156.230 m

Therefore, the reduced level (RL) of the underside of the roof (R) is 156.230 m.
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A bench mark (BM) with reduced level (RL) = 155.305 m has been established at the floor of a room. It is required to find out the RL of the underside of the roof (R) of the room using spirit leveling. The back sight (BS) to the BM has been observed as 1.500 m whereas the foresight (FS) to R has been observed as 0.575 m (staff held inverted). The RL (m) of R will bea)155.880b)156.230c)157.380d)157.860Correct answer is option 'C'. Can you explain this answer?
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A bench mark (BM) with reduced level (RL) = 155.305 m has been established at the floor of a room. It is required to find out the RL of the underside of the roof (R) of the room using spirit leveling. The back sight (BS) to the BM has been observed as 1.500 m whereas the foresight (FS) to R has been observed as 0.575 m (staff held inverted). The RL (m) of R will bea)155.880b)156.230c)157.380d)157.860Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A bench mark (BM) with reduced level (RL) = 155.305 m has been established at the floor of a room. It is required to find out the RL of the underside of the roof (R) of the room using spirit leveling. The back sight (BS) to the BM has been observed as 1.500 m whereas the foresight (FS) to R has been observed as 0.575 m (staff held inverted). The RL (m) of R will bea)155.880b)156.230c)157.380d)157.860Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A bench mark (BM) with reduced level (RL) = 155.305 m has been established at the floor of a room. It is required to find out the RL of the underside of the roof (R) of the room using spirit leveling. The back sight (BS) to the BM has been observed as 1.500 m whereas the foresight (FS) to R has been observed as 0.575 m (staff held inverted). The RL (m) of R will bea)155.880b)156.230c)157.380d)157.860Correct answer is option 'C'. Can you explain this answer?.
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