Past Questions — 2024

In leveling and surveying instruments (like a dumpy level or auto level), 'Focusing' is the process of adjusting the objective lens to ensure that the image of the object being sighted is sharp and clear. Specifically, the goal is to bring the image of the object into the same plane as the cross-hairs. When the object is perfectly focused, it appears sharp and coincides with the cross-hairs, eliminating the effect of parallax. Why other options are incorrect: - a. Line sight: This refers to the straight line connecting the observer's eye to the target object; it is a geometric concept, not an operation. - b. Parallax: Parallax is the apparent shift in the position of the object relative to the cross-hairs when the observer's eye is moved. Parallax is a phenomenon/error that needs to be removed, not the operation of forming the image. - c. Eye piece: The eyepiece is a component of the telescope used to focus the cross-hairs on the observer's retina, but the overall operation of forming the clear image of the object is called focusing.

In surveying, the 'bearing' of a line is the horizontal angle between a reference meridian (True, Magnetic, or Arbitrary) and the line. When this bearing is measured clockwise from a north meridian (usually the North pole) and expressed as an angle from 0° to 360°, it is specifically referred to as the 'Azimuth'. Why other options are incorrect: - a. True bearing: This is a specific type of bearing measured relative to the True Meridian. While it is a bearing, 'bearing' in a general sense is synonymous with 'Azimuth' in many technical contexts. - b. Longitude: This is a geographic coordinate representing the distance east or west of the Prime Meridian, not the direction of a specific line. - d. Magnetic bearing: This is a specific type of bearing measured relative to the Magnetic Meridian. Like true bearing, it is a subset of bearings, not a synonym for the general term.

In surveying, the leveling head (the base upon which the instrument is mounted) typically consists of two parallel plates. The lower plate is designed to be fixed to the tripod, and the upper plate, which supports the instrument and allows for leveling adjustments, is known as the Trivet. Here is a breakdown of the options: - a. Trivet: The correct answer. It is the upper plate of the leveling head. - b. Tribrach: A tribrach is the entire assembly consisting of the trivet, the leveling screws, and the lower plate. It is the complete 'leveling head' rather than just the upper plate. - c. Clamp: A clamp is a locking mechanism used to fix the instrument in place once leveled; it is not a plate. - d. Dumpy level: This is the entire instrument (the telescope and its mounting) used for leveling, not a component of the leveling head.

In the context of a theodolite, it is essential to distinguish between the 'Axis of the Telescope' and the 'Line of Collimation'. 1. **Axis of the Telescope (Optical Axis):** This is the line passing through the centers of the objective lens and the eyepiece. 2. **Line of Collimation (Line of Sight):** This is the line joining the intersection of the cross-hairs (reticle) and the center of the objective lens. In a perfectly adjusted theodolite, the cross-hairs are positioned exactly on the optical axis. Therefore, the line of collimation coincides with the axis of the telescope. However, in technical definitions and practical surveying, the line of collimation is defined as the line passing through the intersection of the cross-hairs and the optical center of the objective. Because these two lines are intended to be identical (coincident), they are mathematically and geometrically considered parallel (with a distance of zero between them). Comparing the options: - **Perpendicular:** Incorrect; they run in the same direction. - **One of the same:** While they are intended to be the same in an ideal instrument, 'Parallel' is the standard technical term used in surveying textbooks to describe their relationship when discussing collimation errors. - **Different:** Incorrect; they are not arbitrary different lines. - **Parallel:** Correct; the line of collimation is designed to be parallel to (and ideally coincident with) the axis of the telescope.

Compass surveying is based on the principle of traversing. Traversing is a method of surveying in which a series of connected lines (traverse legs) are established, where the lengths of the lines are measured by a chain or tape and the directions (bearings) are measured using a compass. By knowing the length and direction of each line, the relative positions of the survey stations can be plotted on a map. Why other options are incorrect: - b. Triangulation: This is the principle of Theodolite surveying or Geodetic surveying, where the area is divided into a network of triangles and angles are measured to determine positions. - c. Chaining: This refers to linear measurement only (Chain Surveying), which relies on the principle of triangulation but does not involve angular measurements like a compass does. - d. Surveying: This is a general term for the entire science of mapping and measurement, not a specific principle of compass surveying.

In leveling, the arithmetic check is a mathematical verification used to ensure that the calculations performed in the field book (using either the Height of Instrument method or the Rise and Fall method) are numerically correct. 1. For the Height of Instrument (HI) method, the check is: ΣBS - ΣFS = Last RL - First RL. 2. For the Rise and Fall method, the check is: ΣBS - ΣFS = ΣRise - ΣFall = Last RL - First RL. Crucially, the arithmetic check only verifies that the subtraction and addition of the recorded numbers were done correctly. It DOES NOT detect errors made during the actual field work (such as misreading the staff, recording a wrong number, or failing to hold the staff vertically). Therefore, it checks the 'Calculation' and not the 'Field work'.

In surveying, a closed traverse is a series of connected lines whose starting point and ending point are the same. 1. **Latitude** is the projection of a traverse line on the North-South meridian (Y-axis). 2. **Departure** is the projection of a traverse line on the East-West parallel (X-axis). Mathematically, if a traverse starts and ends at the same point, the total displacement in the North-South direction must be zero, and the total displacement in the East-West direction must be zero. Therefore: - The algebraic sum of all latitudes (ΣL) = 0 - The algebraic sum of all departures (ΣD) = 0 If the sums are not zero in a field survey, it indicates a 'closing error,' which is then corrected using methods like the Bowditch rule or Transit rule. Options a, b, and c (90, 180, 360) refer to angular measurements and are irrelevant to the linear algebraic sum of coordinates.

In compass surveying, there are different types of meridians used as reference lines. The True Meridian is the line passing through the geographic North and South poles. The Magnetic Meridian is the direction indicated by a freely suspended magnetic needle. The horizontal angle between these two—the True Meridian and the Magnetic Meridian—is defined as the Magnetic Declination. If the magnetic needle points east of the true north, it is called 'East Declination'; if it points west, it is 'West Declination'. Why other options are incorrect: - Fore bearing: This is the bearing of a line measured in the direction of the progress of the survey. - Magnetic bearing: This is the angle measured between the magnetic meridian and the survey line. - Reduced bearing: Also known as Quadrantal Bearing, it is the angle measured from the North or South pole towards the East or West, ranging from 0° to 90°.

Electronic Distance Measurement (EDM) instruments are primarily classified based on the wavelength of the electromagnetic waves they emit to measure distance. The three main types are: 1. Infrared EDM (which uses light waves in the infrared spectrum, common in shorter-range measurements), 2. Light wave/Optical EDM (which uses visible light or laser beams), and 3. Microwave/Radio wave EDM (which uses longer wavelengths for very long-distance measurements, often requiring a transponder). While some textbooks group infrared and visible light together as 'Optical', the standard technical classification for EDM types based on wavelength typically distinguishes between Infrared, Visible Light (Laser), and Microwaves. In the context of standard surveying examinations, the answer is generally recognized as 3.

In the context of Cadastral Surveying (the surveying of land parcels for ownership and taxation purposes), a CRM stands for Cadastral Reference Mark. These are permanent markers or monuments established on the ground to serve as precise reference points for the definition of boundaries, the recovery of lost boundary marks, and the maintenance of the cadastral framework. - Option (b) 'Cadastral Rigid Mark' is not a standard technical term in surveying. - Option (c) 'Cadastral Reference Metadata' refers to data about data, not a physical mark used in field surveying. - Option (d) 'Cadastral Rigid Database' is an incorrect term; while databases are used in GIS, 'CRM' specifically refers to the physical reference marks in the field.

In the Imperial system of measurement, an acre is a unit of area defined as the area of a rectangle with a length of one furlong (220 yards) and a width of one chain (22 yards). Calculation: 1 Acre = 1 furlong × 1 chain 1 Acre = 220 yards × 22 yards 1 Acre = 4,840 square yards. Comparing this to the options: - Option (a) 4480 is incorrect. - Option (b) 4840 is the mathematically correct value. - Option (c) 4048 is incorrect (likely a distractor using digits from 4840). - Option (d) 4084 is incorrect.

A Cadastral survey is a specialized type of survey used to establish, define, and record the legal boundaries of land parcels (properties). Because it deals with legal ownership and property rights, it relies heavily on both physical measurements (fieldwork) and legal documents such as deeds, titles, and historical records to determine the exact extent of a property. Why other options are incorrect: - Geodetic survey: This focuses on the curvature of the earth for large-scale mapping and high precision; it does not primarily rely on property deeds. - Hydrographic survey: This involves mapping the physical features of water bodies (oceans, lakes, rivers) for navigation or construction; it is unrelated to land deeds. - None of the above: Incorrect, as Cadastral survey perfectly fits the description.

A plain scale is the simplest type of scale used in engineering drawing and surveying. It consists of a line divided into a few equal parts (primary divisions) and one of those parts further subdivided into smaller equal parts (secondary divisions). Because it only has one set of subdivisions, it can only be used to measure or read one unit of dimension (e.g., only meters, or only kilometers). To read two units (such as meters and decimeters), a diagonal scale or a vernier scale would be required. Therefore, on a plain scale, it is possible to read only one dimension/unit.

The Global Positioning System (GPS) determines the location of a receiver on Earth by measuring the distance between the receiver and multiple satellites. This process is known as Trilateration. 1. How it works: A GPS receiver measures the time it takes for a signal to travel from a satellite to the receiver. Since the speed of the signal (speed of light) is constant, the distance can be calculated (Distance = Speed × Time). 2. Geometry: A single satellite tells the receiver it is somewhere on the surface of a sphere centered at the satellite. Two satellites narrow the location down to a circle (where two spheres intersect). Three satellites narrow it down to two points (where three spheres intersect), one of which is usually discarded as it is not on the Earth's surface. A fourth satellite is used to synchronize the receiver's clock with the atomic clocks of the satellites to ensure precision. Why other options are incorrect: - Arbitration (a): This is a legal or dispute resolution process, unrelated to satellite navigation. - Orbiteration (c): This is a fabricated term; while satellites are in 'orbit', the mathematical principle of positioning is not called orbiteration. - Globalization (d): This refers to the worldwide integration of economies, cultures, and politics, not a technical measurement principle.

In the Rise and Fall method of leveling, the arithmetic check is performed by comparing the sum of the differences in staff readings. The mathematical check is expressed as: ΣBS - ΣFS = ΣRise - ΣFall = Last RL - First RL. Because the method calculates the difference between every consecutive reading (whether it is a Back Sight, Intermediate Sight, or Fore Sight), any error in recording or calculating any of these readings will result in a discrepancy in the check. Therefore, the Rise and Fall method provides a comprehensive check on all staff readings, including Back Sights (BS), Fore Sights (FS), and Intermediate Sights (IS). In contrast, the Height of Instrument (HI) method only provides a check on BS and FS, ignoring the Intermediate Sights.

In the context of mapping and surveying, a 'Scale' is the fundamental requirement for preparing any plan or map. A scale is defined as the ratio between the distance on the map and the corresponding actual distance on the ground. Without a scale, a drawing is merely a sketch and cannot be used for precise measurement, land revenue calculations, or engineering purposes. Why other options are incorrect: - b. Angles: While angles are measured during the surveying process (using a theodolite or compass), they are a component of the data collection, not the basic requirement for the representation of the map itself. - c. Graph: A graph is a tool for plotting data or showing relationships between variables, not a requirement for the preparation of a geographical map. - d. Polygons: Polygons are used to represent areas (like land parcels) on a map, but they are a result of the mapping process, not a basic requirement for the preparation of the map's framework.

Hydrographic surveying is a branch of surveying that deals with the measurement and description of physical features of water bodies. This includes mapping the shoreline, determining the depth of the water (bathymetry), and identifying underwater hazards or topography. It is essential for navigation, dredging, and coastal engineering. Analysis of options: - Option (a) is correct because hydrographic surveys are specifically designed to map large water bodies such as oceans, seas, lakes, and rivers. - Option (b) is incorrect because rainfall data is collected through meteorological observations (hydrology/meteorology), not surveying. - Option (c) is incorrect because wave movement is studied under oceanography or fluid dynamics; while hydrographic surveys may consider wave conditions for safety, their primary goal is mapping the physical layout of the water body.

In leveling, the first reading taken after the instrument is set up is always the Back Sight (BS). A Back Sight is a staff reading taken on a point of known elevation (a Benchmark or a previously established point) to determine the height of the instrument (HI). Here is why the other options are incorrect: - Fore sight (FS): This is the last reading taken before moving the instrument to a new position. It is used to determine the elevation of a new point. - Intermediate sight (IS): These are any readings taken between the Back Sight and the Fore Sight. - Invert: This term refers to the lowest internal level of a pipe, culvert, or channel, and is not a type of leveling reading.

The 'Three Point Problem' in plane table surveying is the process of orienting the table and determining the location of the station when three known points are visible. There are primarily two methods used to solve this problem: 1. The Graphical Method (also known as the Tracing Paper Method) and 2. The Mechanical Method (specifically Lehman's Rule/Method). Looking at the options provided: - Option (a) 'Tracing paper method' is a valid way to solve the problem, but it is usually referred to as the 'Graphical Method'. - Option (b) 'Longitude' is a geographical coordinate and has nothing to do with the methodology of solving a three-point problem. - Option (c) 'Lehman’s method' is the standard, widely recognized mechanical method used to solve the three-point problem by utilizing a drawing instrument to find the point where the rays intersect. While both (a) and (c) are technically used, in the context of standard Civil Engineering competitive exams, 'Lehman's Method' is the definitive technical term associated with the mechanical solution of the three-point problem. However, since 'Longitude' is completely irrelevant, 'All of these' (d) is incorrect. Between (a) and (c), Lehman's method is the most specific and authoritative answer for this technical subject.

A planimeter is a mechanical or digital instrument used to measure the area of an arbitrary two-dimensional shape on a map or drawing. It works by tracing the perimeter of the figure; the device integrates the movement of the tracing arm to calculate the total area enclosed. Why other options are incorrect: - a. Length: Measured using tools like tapes, chains, or odometers. - b. Weight: Measured using scales or balances. - c. Volume: Measured using graduated cylinders or calculated via volumetric formulas.

In surveying and leveling, the Mean Sea Level (MSL) serves as the primary datum (reference surface) for determining elevations. For the Indian subcontinent, the standard datum used for the Great Trigonometrical Survey (GTS) and subsequent leveling operations was historically established based on the Mean Sea Level observed at Karachi. Although Karachi is now in Pakistan, the historical benchmark for the Indian leveling network remains the MSL at Karachi. Options b, c, and d are incorrect because while Bombay (Mumbai) and Chennai are coastal cities, they were not the primary reference points used to establish the national vertical datum for India.

In the context of surveying instruments and competitive examinations for land revenue and settlement departments, the standard operational battery life for a single fully charged battery of a professional Total Station is typically rated for a full working day, which is generally considered to be 8 hours. While modern high-end instruments may vary (some lasting longer or shorter depending on the use of the EDM and display brightness), '8 hours' is the conventional benchmark answer used in technical examinations to represent a standard shift of field operations. Options a, c, and d are less common as standard baseline specifications for general total station battery capacity in academic/exam contexts.

The definition provided in the question describes a 'Map'. A map is a symbolic representation of selected characteristics of a place, usually drawn on a flat surface. Specifically, in cartography, it is defined as the representation of the earth's surface (or a part of it) on a plane surface, typically using a scale. Why other options are incorrect: - a. Scale: Scale is the ratio between the distance on a map and the corresponding distance on the ground; it is a tool used in mapping, not the representation itself. - b. Diagram: A diagram is a simplified drawing showing the appearance, structure, or workings of something; it does not necessarily represent the earth's pattern or geographical space. - d. Map projection: A map projection is the mathematical method used to transfer the curved surface of the earth (a sphere or ellipsoid) onto a flat plane. It is the process/technique used to create a map, not the representation itself.

In surveying, it is crucial to distinguish between a 'level surface' and a 'horizontal plane'. 1. **Level Surface**: A level surface is a curved surface that is everywhere perpendicular to the direction of gravity (plumb line). Because the Earth is approximately spherical, the direction of gravity changes from point to point. Therefore, a level surface is not a flat plane but follows the curvature of the Earth. The most common example of a level surface is the surface of still water (like a still pond), as water naturally settles to be perpendicular to gravity at every point. 2. **Analysis of Options**: - **Option (a) Surface of earth**: The Earth's surface is irregular (mountains, valleys) and is not a level surface. - **Option (b) Surface of still pond**: This is the correct answer. A body of water at rest forms a level surface because every point on the surface is perpendicular to the local gravity vector. - **Option (c) Surface of reservoir**: While a reservoir is water, the term 'still pond' is the textbook definition for a level surface. A reservoir may have currents or waves, but more importantly, 'still pond' is the standard technical example used in surveying literature. - **Option (d) Surface of sea**: While the sea is a level surface on a large scale, it is subject to tides, currents, and waves, making it less 'still' than a pond for a theoretical example. However, in a strict technical sense, the 'mean sea level' is a level surface, but 'still pond' is the most precise example of a static level surface. Therefore, the surface of a still pond is the classic example of a level surface.

In surveying, there are different types of chains used depending on the requirement. The 'Surveyor's Chain' (also known as Gunter's Chain) is a standardized tool used primarily for measuring land. 1. **Length**: A Gunter's chain is exactly 66 feet long. 2. **Links**: It is divided into 100 equal links. Therefore, each link is 0.66 feet (or 7.92 inches). 3. **Significance**: The length of 66 feet was chosen because 80 chains equal exactly 1 mile (80 x 66 = 5280 feet), and 10 square chains equal 1 acre, making land area calculations very simple. Comparing with other options: - Option (b) describes an 'Engineer's Chain' (100 feet with 100 links). - Options (c) and (d) do not correspond to standard surveying chain specifications.