Question:
Given below are two statements:Statement (I): The axis of the bubble tube should be perpendicular to the vertical axis in dumpy level.Statement (II): The line of collimation of the telescope of the dumpy level should be perpendicular to the axis of the bubble tube.In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements:
Statement (I): The axis of the bubble tube should be perpendicular to the vertical axis in dumpy level.
Statement (II): The line of collimation of the telescope of the dumpy level should be perpendicular to the axis of the bubble tube.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
Recall that the bubble tube axis relates to the vertical axis one way, and to the line of sight a different way, in the two permanent adjustments of a dumpy level.
Updated On: Jul 6, 2026
- Both Statement (I) and Statement (II) are correct.
- Both Statement (I) and Statement (II) are incorrect.
- Statement (I) is correct but Statement (II) is incorrect.
- Statement (I) is incorrect but Statement (II) is correct.
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: A dumpy level has two permanent adjustments that must both be satisfied for the instrument to give a true horizontal line of sight when its bubble is centred.
Step 2: The first adjustment concerns the level tube (bubble tube). Its axis must be set perpendicular to the vertical axis of the instrument. This way, when the bubble is centred, the vertical axis of the level truly points straight up and down, which in turn keeps the horizontal circle and the line of sight properly horizontal as the telescope is swung around. So Statement (I) describes a genuine, correct relationship.
Step 3: The second adjustment concerns the line of collimation, the line of sight through the telescope. For the level to read a correct horizontal staff reading, this line of sight must be made parallel to the axis of the bubble tube, not perpendicular to it. If the line of collimation were perpendicular to the bubble tube axis instead of parallel, centring the bubble would not make the line of sight horizontal at all, it would point straight down or up, which defeats the purpose of a levelling instrument.
Step 4: Because Statement (II) swaps parallel for perpendicular, it misstates the real adjustment condition and is incorrect.
Step 5: So Statement (I) is correct and Statement (II) is incorrect, which is option 3.
Was this answer helpful?
0
0
Top ICAR AIEEA Agricultural Engineering and Technology Questions
- Which of the following farm equipment is not going to be utilized during the wheat production?
- On the farm, during paddy land preparation, if one wheel of tractor gets in mud, which of the following mechanism will be useful to take out the tractor from mud by distributing equal amount of traction at both the rear wheels?
- 20 labors engaged in a farm-operation on paddy farm for 6h. In an ideal conditions, how much maximum energy is utilized by labors into the farm?
(A) 8.94 kWh (B) 120 kWh (C) 12 hPh (D) 240 hPh Choose the correct answer from the options given below: - Which of the following farm operations utilizes the stationary source of power?
(A) Irrigation Water Lifting (B) Winnowing (C) Threshing (D) Harvesting (E) Cultivation (F) Transportation Choose the correct answer from the options given below: - Which of the following methods are employed for the estimation of infiltration characteristics of soil for design of irrigation system?
(A) Use of Infiltrometer (B) Measurement of subsidence of free water in a large basin (C) Estimation of accumulated infiltration from water front advance data Choose the correct answer from the options given below:
View More Questions
Top ICAR AIEEA Surveying Questions
- (A) In levelling, datum surface is an arbitrary surface with reference to which the elevations of the points are measured and compared.
(B) The line of collimation or the line of sight is the line joining the intersection of the cross-hairs to the optical centre of the object glass and its continuation.
(C) A foresight is the first staff reading taken after setting up the instrument in any position.
(D) The height of instrument is the elevation of the plane of collimation when the instrument is levelled.
(E) A change point indicates the shifting of the instrument, both back sight and intermediate sight are taken on this change point.
Choose the correct answer from the options given below: - Match List-I with List-II.
List-I List-II (A) Close contour lines (I) Foot hill (B) Wider contour lines (II) Higher contour values outside (C) Depression (III) At right angles (D) Crossing of ridge lines (IV) Top of hill Choose the correct answer from the options given below: - Which points should be kept in mind while selecting the stations?(A) The survey lines should be as few as possible.(B) If possible, a base line should be run roughly through the middle of the area on which the framework of triangles covering the major portions of area may be built up.(C) Offsets should be long particularly for locating the important features.(D) All the triangles should be well conditioned.(E) The main principle of surveying is to work from the part to the whole.Choose the correct answer from the options given below:
- The contour interval depends on: (A) time and expanse of field and office work, (B) purpose and extent of survey, (C) scale of plan and nature of country, (D) contour characteristics, (E) interpolation of contours. Choose the correct answer from the options given below:
- The instruments required for contour survey are: (A) dumpy level, (B) levelling staff, (C) chains and tapes, (D) odometer, (E) prismatic compass. Choose the correct answer from the options given below:
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions