In reciprocal levelling, the error which is not completely eliminated, is due to
(A) Earth's curvature
(B) Non-adjustment of line of collimation
(C) Refraction
(D) Non-adjustment of the bubble tube
Description : Which of the following statements is incorrect? (A) Error due to refraction may not be completely eliminated by reciprocal levelling (B) Tilting levels are commonly used for precision work (C) The last reading of levelling is always a foresight (D) All of the above statements are incorrect
Last Answer : (D) All of the above statements are incorrect
Description : The method of finding out the difference in elevation between two points for eliminating the effect of curvature and refraction, is (A) Reciprocal levelling (B) Precise levelling (C) Differential levelling (D) Flying levelling
Last Answer : (A) Reciprocal levelling
Description : Which of the following in theodolite work is imperfect adjustment of the instrument (a) Error due to line of collimation being perpendicular to the horizontal axis (b) Error due to axis not to perpendicular ... to imperfect graduation (d) Error due to eccentricity of vernires (e) All of the above*
Last Answer : (e) All of the above*
Description : While rotating the theodolite in the horizontal plane, the bubble of the bubble tube takes up the same position in its tube, it indicates (A) The rotation axis is vertical (B) The trunnion ... (C) The line of collimation is perpendicular to vertical axis (D) None of the above
Last Answer : (A) The rotation axis is vertical
Description : In an adjusted level, when the bubble is central, the axis of the bubble tube becomes parallel to (A) Line of sight (B) Line of collimation (C) Axis of the telescope (D) None of these
Last Answer : (A) Line of sight
Description : When the bubble of the level tube of a level, remains central (A) Line of sight is horizontal (B) Axis of the telescope is horizontal (C) Line of collimation is horizontal (D) Geometrical axis of the telescope is horizontal
Last Answer : (A) Line of sight is horizontal
Description : In horizontal angles, the error due to imperfect levelling of the plate bubble is (A) Large when sights are nearly level (B) Large for long sights (C) Less for steeply inclined sights (D) Large for steeply inclined sights
Last Answer : (D) Large for steeply inclined sights
Description : A level when set up 25 m from peg A and 50 m from peg B reads 2.847 on a staff held on A and 3.462 on a staff held on B, keeping bubble at its centre while reading. If the reduced levels of A and B are 283.665 m ... collimation error per 100 m is (A) 0.015 m (B) 0.030 m (C) 0.045 m (D) 0.060 m
Last Answer : (D) 0.060 m
Description : A theodolite is said to be in perfect adjustment if (A) Rotation axis is vertical to the transit axis (B) Transit axis is perpendicular to line of collimation (C) Line of collimation sweeps out a vertical plane while the telescope is elevated or depressed (D) All the above
Last Answer : (D) All the above
Description : Refraction correction (A) Completely eliminates curvature correction (B) Partially eliminates curvature correction (C) Adds to the curvature correction (D) Has no effect on curvature correction
Last Answer : (B) Partially eliminates curvature correction
Description : The radius of curvature of the arc of the bubble tube is generally kept (A) 10 m (B) 25 m (C) 50 m (D) 100 m
Last Answer : (D) 100 m
Description : The sensitiveness of a level tube decreases if (A) Radius of curvature of its inner surface is increased (B) Diameter of the tube is increased (C) Length of the vapour bubble is increased (D) Both viscosity and surface tension are increased
Last Answer : (D) Both viscosity and surface tension are increased
Description : The sensitivity of a bubble tube can be increased by (A) Increasing the diameter of the tube (B) Decreasing the length of bubble (C) Increasing the viscosity of liquid (D) Decreasing the radius of curvature of tube
Last Answer : (A) Increasing the diameter of the tube
Description : Pick up the correct statement from the following: (A) It is difficult to eliminate an error completely at first trial (B) Instability of the instrument makes it almost impossible to adjust it ... ) Adjustment screws must be left bearing firmly but should never be forced (D) All the above
Description : A dumpy level was set up at the midpoint between two pegs A and B, 50 m apart and the staff readings at and were 1.22 and 1.06. With the level set up at , the readings at and were 1.55 and ... upwards (B) 0.04 m inclined downwards (C) 0.04 m inclined upward (D) None of these
Last Answer : (B) 0.04 m inclined downwards
Description : The line of sight is kept as high above ground surface as possible to minimise the error in the observed angles due to (A) Shimmering (B) Horizontal refraction (C) Vertical refraction (D) Both shimmering and horizontal refraction
Last Answer : (D) Both shimmering and horizontal refraction
Description : Explain reciprocal levelling with neat sketch.
Last Answer : Reciprocal levelling is adopted i) To find the difference in level accurately Between the two points considerably apart. ii) When it is not possible to set up the level in between the two points ... true difference is equal to the mean of the two apparent differences of level between A and B
Description : Horizontal distances obtained tacheometerically are corrected for (A) Slope correction (B) Temperature correction (C) Refraction and curvature correction (D) All the above
Last Answer : (C) Refraction and curvature correction
Description : The combined effect of curvature and refraction over a distance kilometres is (A) 67.2 L2 mm (B) 76.3 L2 mm (C) 64.5 L2 mm (D) None of these
Last Answer : (A) 67.2 L2 mm
Description : Probable accidental error in precise levelling as recommended by International Geodetic Association should not exceed (where k is in kilometers.) (A) ± 0.1 k mm (B) ± 0.5 k mm (C) ± 1 k mm (D) ± 5 k mm
Last Answer : (C) ± 1 k mm
Description : Probable systematic error in precise levelling as recommended by International Geodetic Association should not exceed (where is in kilometers.) (A) ± 0.1 k mm (B) ± 0.2 k mm (C) ± 0.1 k (D) 0.2 k mm
Last Answer : (D) 0.2 k mm
Description : Consider the following pre-conditions for correct use of a theodolite: 1. The vertical axis need not be perpendicular to the plane of the plate level bubble. 2. The line of sight must be perpendicular to the horizontal axis. 3. The axis of ... ? (a) 1, 2, 3 & 4 (b) 2 only (c) 3 only (d) 1 & 4 only
Last Answer : (b) 2 only
Description : A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic (A) Spherical aberration (B) Chromatic aberration (C) Coma (D) Astigmatism
Last Answer : (A) Spherical aberration
Description : A clinometer is used for (A) Measuring angle of slope (B) Correcting line of collimation (C) Setting out right angles (D) Defining natural features
Last Answer : (A) Measuring angle of slope
Description : The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as (A) Line of sight (B) Line of collimation (C) Axis of the telescope (D) None of these
Last Answer : (B) Line of collimation
Description : The line of collimation method of reduction of levels, does not provide a check on (A) Intermediate sights (B) Fore sights (C) Back sights (D) Reduced levels
Last Answer : (A) Intermediate sights
Description : Which one of the following statements is not correc t? (a) Parallax error is eliminated when there is no change in the staff reading when eye is moved up and down (b) The objective lens is ... (d) The eyepiece need not be adjusted after the first set up when the same surveyor is taking readings
Last Answer : (b) The objective lens is to be focused towards a white or bright background for clear visibility of cross-hairs
Description : The curvature of the earth's surface, is taken into account only if the extent of survey is more than (A) 100 sq km (B) 160 sq km (C) 200 sq km (D) 260 sq km
Last Answer : (D) 260 sq km
Last Answer : Sometimes microwave signals follow the earth’s curvature. This due to Ducting.
Description : In precision theodolite traverse if included angles are read twice and the mean reading accepted using both verniers having a least count of 30". Assuming the instrument to be in perfect adjustment, linear measurements correct to 6 mm per ... legs) (A) 50" n (B) 30" n (C) 60" n (D) None of these
Last Answer : (A) 50" n
Description : Bowditch rule is applied to (A) An open traverse for graphical adjustment (B) A closed traverse for adjustment of closing error (C) Determine the effect of local attraction (D) None of the above
Last Answer : (B) A closed traverse for adjustment of closing error
Description : Which one of the following processes is responsible for the glittering of air bubble rising through water? (1) Reflection of light (2) Refraction of light (3) Total internal reflection of light (4) Scattering of light
Last Answer : (3) Total internal reflection of light Explanation: Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
Last Answer : Total internal reflection of light
Description : The tangent to the liquid surface in a level tube, is parallel to the axis of the level tube at (A) Every point of the bubble (B) Either end of the bubble (C) The mid-point of the bubble (D) No where
Last Answer : (C) The mid-point of the bubble
Description : The longitudinal section of the surface of bubble tube is (A) Straight (B) Circular (C) Parabolic (D) Elliptic
Last Answer : (B) Circular
Description : For high sensivity of the bubble tube (A) A liquid of low viscosity is used (B) A liquid of low surface tension is used (C) The bubble space should be long (D) All the above
Description : In a constant level tube, size of the bubble remains constant because upper wall is (A) Of relatively larger radius (B) Of relatively smaller radius (C) Flat (D) Convex downwards
Last Answer : (A) Of relatively larger radius
Description : The bubble tube is nearly filled with (A) Alcohol or chloroform (B) A liquid which is very mobile (C) A liquid having low freezing point (D) All the above
Description : Sensitiveness of a level tube is designated by (A) Radius of level tube (B) Length of level tube (C) Length of bubble of level tube (D) None of the above
Last Answer : (A) Radius of level tube
Description : With the rise of temperature, the sensitivity of a bubble tube (A) Decreases (B) Increases (C) Remains unaffected (D) None of the above
Last Answer : (A) Decreases
Description : The desired sensitivity of a bubble tube with 2 mm divisions is 30". The radius of the bubble tube should be (A) 13.75 m (B) 3.44 m (C) 1375 m (D) None of these
Last Answer : (A) 13.75 m
Description : Profile levelling is usually done for determining (A) Contours of an area (B) Capacity of a reservoir (C) Elevations along a straight line (D) Boundaries of property
Last Answer : (C) Elevations along a straight line
Description : In levelling operation, (A) The first sight on any change point is a back sight (B) The second sight on any change point is a fore sight (C) The line commences with a fore sight and closes with a back sight (D) The line commences with a back sight and closes with a foresight
Last Answer : (D) The line commences with a back sight and closes with a foresight
Description : If a drug is eliminated by first order kinetics: A. A constant amount of the drug will be eliminated per unit time B. Its clearance value will remain constant C. Its elimination half life will increase with dose D. It will be completely eliminated from the body in 2 × half life period
Last Answer : B. Its clearance value will remain constant
Description : Define : 1) Bench mark 2) Datum surface 3) Line of collimation 4) Change Point
Last Answer : 1) Bench mark: - It is a fixed reference point of known elevation.. 2)Datum surface :-It is any arbitrarily assumed level surface from which vertical distance are measured 3) Line of collimation:- ... which the fore and back sights are taken. It is the point denoting the shifting of the level.
Description : Define the term: (1) Level surface (2) Line of collimation
Last Answer : Level surface: It is a surface parallel to the mean spheroidal surface of the earth. It is normal to the direction of plumb line at all points. The surface of still water is an example of level ... to the optical center of object glass and its continuation. It is also called as line of sight.
Description : Earthquake is caused by – (1) disturbance of earth surface (2) adjustment of layers of earth's crust (3) breakage of rock system (4) upliftment of rocks
Last Answer : (1) disturbance of earth surface Explanation: Most earthquakes are minor tremors. Larger earthquakes usually begin with slight tremors but rapidly take the form of one or more violent shocks, and end in ... is called its focus; the point on the surface directly above the focus is the epicenter.
Description : Earthquake is caused by (1) disturbance of earth surface (2) adjustment of layers of earth’s crust (3) breakage of rock system (4) upliftment of rocks
Last Answer : disturbance of earth surface
Description : Band loss is ∙ a. A reduction in transmitter power caused by earth’s surface curvature ∙ b. A reduction in strength of the signal caused by folded dipole bends ∙ c. An attenuation increase caused by bends radiating from the side of the fiber ∙ d. All of these
Last Answer : c. An attenuation increase caused by bends radiating from the side of the fiber