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To find the R.L. of a roof slab of a building, staff reading were taken from a particular set up of the levelling instrument. The reading were 1.050m with staff on the B.M. and 2.300m with staff below the roof slab and held invertd. Taking the R.L. of the B.M. as 135.150m, the R.L. of the roof slab will be, a) 129.800 b) 131.900 c) 134.400 d) 138.500?
Most Upvoted Answer
To find the R.L. of a roof slab of a building, staff reading were take...
BM reading 1.050
BM RL 135.150
STAFF 2.300
BM+RL+STAFF=138.500
Community Answer
To find the R.L. of a roof slab of a building, staff reading were take...
Solution:

Given,
Height of B.M. = R.L. of B.M. – staff reading = 135.150 – 1.050 = 134.100 m
Height of roof slab = staff reading – R.L. of B.M. = 2.300 – 135.150 = – 132.850 m

Since the height of the roof slab is negative, we need to take the absolute value of it to get the correct answer.

|Height of roof slab| = 132.850 m

Therefore,
R.L. of roof slab = R.L. of B.M. + |Height of roof slab| = 135.150 + 132.850 = 268.000 m

Hence, the answer is option (d) 138.500.

Steps to solve the problem:

- Find the height of B.M. using the given staff reading and R.L. of B.M.
- Find the height of the roof slab using the given staff reading and R.L. of B.M.
- Take the absolute value of the height of the roof slab.
- Add the absolute value of the height of the roof slab to the R.L. of B.M. to get the R.L. of the roof slab.
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To find the R.L. of a roof slab of a building, staff reading were taken from a particular set up of the levelling instrument. The reading were 1.050m with staff on the B.M. and 2.300m with staff below the roof slab and held invertd. Taking the R.L. of the B.M. as 135.150m, the R.L. of the roof slab will be, a) 129.800 b) 131.900 c) 134.400 d) 138.500?
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To find the R.L. of a roof slab of a building, staff reading were taken from a particular set up of the levelling instrument. The reading were 1.050m with staff on the B.M. and 2.300m with staff below the roof slab and held invertd. Taking the R.L. of the B.M. as 135.150m, the R.L. of the roof slab will be, a) 129.800 b) 131.900 c) 134.400 d) 138.500? for SSC JE 2024 is part of SSC JE preparation. The Question and answers have been prepared according to the SSC JE exam syllabus. Information about To find the R.L. of a roof slab of a building, staff reading were taken from a particular set up of the levelling instrument. The reading were 1.050m with staff on the B.M. and 2.300m with staff below the roof slab and held invertd. Taking the R.L. of the B.M. as 135.150m, the R.L. of the roof slab will be, a) 129.800 b) 131.900 c) 134.400 d) 138.500? covers all topics & solutions for SSC JE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for To find the R.L. of a roof slab of a building, staff reading were taken from a particular set up of the levelling instrument. The reading were 1.050m with staff on the B.M. and 2.300m with staff below the roof slab and held invertd. Taking the R.L. of the B.M. as 135.150m, the R.L. of the roof slab will be, a) 129.800 b) 131.900 c) 134.400 d) 138.500?.
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