CameraIcon

SearchIcon

MyQuestionIcon

3

You visited us 3 times! Enjoying our articles? Unlock Full Access!

Application of Similarity

A theodolite ...

Question

A theodolite is set up at station A. The RL of instrument axis is 212.250 m. The angle of elevation to the top of a 4 m long staff , held vertical at station B, is $7^{\circ}$ . The horizontal distance between station A and B is 400 m. Neglecting the errors due to curvature of earth and refraction , the RL ( in m , round of to three decimal places ) of station B is
257.364

Open in App

Solution

The correct option is A 257.364

R.L. of B = 212.250 + 400 tan $7^{\circ}$ - 4

= 257.364 mm

Suggest Corrections

thumbs-up

0

Similar questions

Q. A theodolite is set up at station A and 3 m long staff is is held vertically at station B. The depression angle reading at 2.5 m marking on the staff is

6^{\circ} 10^{'}

. The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L of A is 880.88 m. Apply the curvature and refraction correction, and determine the R.L of B (in m)

Q. A staff is placed on a benchmark (BM) of reduced level (RL)

100.000 m

and a theodolite is placed at a horizontal distance of

50 m

from the BM to measure the vertical angles. The measured vertical angles from the horizontal at the staff readings of

0.400 m

2.400 m

are found to be the same. Taking the height of the instrument as

1.400 m

m

) of the theodolite station is

Q. An instrument was setup at P and angle of elevation to a vane 4 m above the foot of staff held at Q was

9^{\circ} 30^{'}

. The horizontal distance between P and Q was known to be 2000 m. What is the R.L. (in m) of staff station Q?
[Given that the R.L of instrument axis was 2650.38 m and consider refraction and curvature corrections]

Q. A level instrument at a height of 1.320 m has been placed at a station having a reduced level (RL) of 112.565 m. the instrument reads - 2.835 m on a levelling staff held at the bottom of a bridge deck. The RL (in m) of the bottom of the bridge deck is

Q. If the distance between the instrument station and staff station is 1km, the correction for refraction in 'm' is

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

MATHEMATICS

Watch in App

explore_more_icon

Explore more

Application of Similarity

Standard IX Mathematics

Join BYJU'S Learning Program

CrossIcon