Past Questions — 2024

In chain surveying, offsets are lateral measurements taken from the main chain line to locate objects or boundaries. Offsets are categorized into two types: Long Offsets and Short Offsets. 1. Short Offsets: These are typically offsets less than 15 meters in length. Because they are short and do not require extreme precision (as they are often used for small features), they are traditionally measured using an ordinary chain or a measuring tape. In the context of standard surveying textbooks and exam patterns for chain surveying, the 'ordinary chain' is the primary tool associated with these measurements. 2. Why other options are incorrect: - Invar Chain (b): This is a highly precise chain made of an alloy of steel and nickel, used for baseline measurements where thermal expansion must be minimized. It is far too expensive and specialized for simple offset measurements. - Metallic Tape (c) and Steel Tape (d): While tapes are frequently used in modern practice for offsets due to their ease of use, the specific terminology of 'Chain Surveying' (as per the topic provided) emphasizes the use of the chain. Between the options provided, the 'ordinary chain' is the fundamental tool for general-purpose measurements in this specific surveying method.

To determine the size of the map, we must apply the scale to the actual geographical dimensions of India. 1. **Geographical Dimensions of India**: The approximate extent of India is roughly 3,214 km from North to South and about 2,933 km from East to West. For mapping purposes, the bounding box is often approximated to roughly 3,200 km x 4,500 km (including the maritime boundaries/extent) or specifically tailored to the map sheet size. 2. **Applying the Scale**: The given scale is 1:15,000,000. This means 1 unit on the map represents 15,000,000 units on the ground. 3. **Calculation for Width/Length**: - If we take the approximate maximum extent of India (including the Andaman and Nicobar Islands and the westernmost point), the distance is roughly 510,000,000 cm (5,100 km). - Map distance = Actual distance / Scale factor - Map distance = 510,000,000 / 15,000,000 = 34 cm. 4. **Calculation for Height**: - The North-South extent is approximately 3,214 km = 321,400,000 cm. - Map distance = 321,400,000 / 15,000,000 ≈ 21.4 cm. 5. **Standard Map Sheet Sizing**: In cartography, maps are not drawn to the exact edge of the landmass; they include margins, legends, and scale bars. For a scale of 1:15,000,000, the standard sheet size used to accommodate the entirety of the Indian subcontinent (including the surrounding sea and margins) is 34 cm x 30 cm. Comparing this to the options provided, option (d) 34x30cm is the standard technical answer for this specific scale mapping of India.

A Planimetric map (or plan) is a representation of the Earth's surface that shows only the horizontal positions of features (such as roads, rivers, and buildings) without depicting relief or elevation (contours). These maps are often referred to as 'Chrographical maps' (from the Greek 'choros' meaning place/region and 'graphia' meaning writing/drawing), as they focus on the descriptive layout of a specific area's features on a flat plane. Why other options are incorrect: - a. Cadastral map: These are large-scale maps showing property boundaries and land ownership, specifically for legal and taxation purposes. - b. Wall map: This refers to the physical format/size of a map intended to be hung on a wall, not a specific cartographic type. - c. Atlas map: This refers to a collection of maps bound in a book, covering various scales and regions.

In Plane Table Surveying, the 'Two-Point Problem' and 'Three-Point Problem' are specific techniques used to establish the position of the table and align it with the map. 1. **Resection**: This is the process of determining the location of an unknown point (the station where the plane table is set up) by sighting known points on the ground whose positions are already plotted on the map. Both the two-point and three-point problems are primary methods of resection. 2. **Orientation**: Once the position of the table is fixed (resection), the table must be aligned so that the lines drawn on the paper are parallel to the corresponding lines on the ground. This process is called orientation. Since the ultimate goal of solving these problems is to first find the station's location (Resection) and then align the table (Orientation) to begin further plotting, these methods encompass both processes. While they are fundamentally resection methods, they are used specifically to achieve orientation of the map relative to the ground.

In surveying and triangulation, a 'well-conditioned triangle' is one where the precision of the calculated sides is maximized relative to the precision of the measured angles. A triangle is considered well-conditioned if no angle is too small or too large. Specifically, the standard engineering rule of thumb is that a triangle is well-conditioned if all its angles are between 30° and 120°. If any angle is less than 30°, the triangle is considered 'ill-conditioned' because small errors in angle measurement lead to significant errors in the calculation of the side lengths (due to the properties of the Sine Rule). Therefore, for a triangle to be well-conditioned, it is required that none of its angles be less than 30°.

The fundamental principle of chain surveying is 'triangulation'. In this method, the area to be surveyed is divided into a network of well-conditioned triangles. This is done because a triangle is the only simple plane figure that can be uniquely defined by knowing the lengths of its three sides (SSS congruence). By measuring the lengths of the sides of these triangles using a chain or tape, the relative positions of all points in the survey area can be accurately plotted on a map. Why other options are incorrect: - a. Rectangle: A rectangle requires knowledge of angles (90 degrees) to be defined; chain surveying primarily relies on linear measurements. - b. Straight lines: While chains measure straight lines, a single line does not define an area. - d. Squares: Similar to rectangles, squares require specific angle measurements and equal side lengths, which is not the general principle used to divide an unknown terrain.

Magnetic dip (also known as magnetic inclination) is the angle that a magnetic needle makes with the horizontal plane of the earth. 1. At the Magnetic Equator: The magnetic field lines are parallel to the earth's surface, so the dip is 0°. 2. At the Magnetic Poles: The magnetic field lines are perpendicular to the earth's surface, pointing vertically downwards (at the North Pole) or upwards (at the South Pole). Therefore, the magnetic needle will stand vertically, making an angle of 90° with the horizontal plane. Comparing the options: - Option (a) 0° occurs at the magnetic equator. - Option (b) 45° occurs at some intermediate latitude between the equator and the poles. - Option (c) 60° occurs at some intermediate latitude. - Option (d) 90° occurs exactly at the magnetic poles.

In surveying and engineering drawing, different scales are used based on the precision and number of dimensions required: 1. **Plain Scale**: Used to measure up to two dimensions (e.g., meters and decimeters). It consists of a line divided into a number of equal parts. 2. **Diagonal Scale**: This scale is specifically designed to measure three consecutive dimensions (e.g., meters, decimeters, and centimeters) or to read a measurement to a precision of 1/100th of a main unit. It works on the principle of similar triangles, where a diagonal line is used to divide a small division into further equal parts. 3. **Chord Scale**: Used primarily for measuring distances along a curved surface or for specific astronomical/navigational purposes, not for three-dimensional linear measurement. 4. **Vernier Scale**: A device used to increase the precision of a measurement by using a sliding scale (vernier) against a fixed scale, but it is not categorized as a scale for measuring 'three dimensions' in the context of representative fractions/drawing scales. Therefore, the diagonal scale is the correct tool for measuring three dimensions.

A Total Station is an integrated electronic instrument used in modern surveying. It combines the functions of an Electronic Theodolite (which measures horizontal and vertical angles electronically) and an Electronic Distance Meter (EDM, which measures the slope distance between the instrument and a prism/reflector using electromagnetic waves). By integrating these two components with an onboard microprocessor, the Total Station can automatically calculate coordinates (X, Y, Z) and distances using trigonometry. Analysis of options: - Option (a) 'EDM and Theodolite' is partially correct, but 'Electronic Theodolite' is the more precise technical term as Total Stations are fully digital. - Option (b) and (d) are incorrect because a Compass is not a primary component of a Total Station; orientation is typically handled via a known baseline or a GPS/GNSS integration, not a magnetic compass.

The amount of detail and information that can be represented on a map is primarily governed by the 'Scale'. 1. Scale: The scale determines the ratio between the distance on the map and the actual distance on the ground. A large-scale map (e.g., 1:500) covers a small area but allows for high detail (showing individual buildings, small streams, etc.). A small-scale map (e.g., 1:1,000,000) covers a vast area (like a continent) but can only show major cities or borders because there is physically not enough space to represent smaller details. Therefore, the scale directly dictates the 'amount of information' that can be realistically shown. 2. Projection: Map projection is the method used to represent the curved surface of the earth on a flat plane. While it affects the distortion of shape, area, or distance, it does not determine how much detail (information) is included in the map. 3. Conventional Signs: These are standardized symbols used to represent features (e.g., a cross for a church). While they help in communicating information efficiently, they are a tool for representation, not the limiting factor that determines the quantity of information that can be fit onto the map. Since the scale is the fundamental limiting factor for the level of detail/information, option (a) is the correct answer.

An optical square is a instrument used in surveying to set out right angles (90 degrees) from a given line. It works on the principle of reflection. The instrument consists of a frame with a mirror fixed at an angle of 45° to the line of sight. When the surveyor looks through the eyepiece, they see a reflection of the object in the mirror. According to the laws of reflection, the angle between the incident ray (the line of sight to the mirror) and the reflected ray (the line of sight to the object) is twice the angle between the mirror and the line of sight. Since the mirror is fixed at 45°, the angle between the two lines of sight is 2 × 45° = 90°. Therefore, the mirror must be fixed at exactly 45° to ensure a precise right angle is established.

Surveying is defined as the art and science of determining the relative positions of points on, above, or beneath the surface of the earth by means of direct or indirect measurements of distance, direction, and elevation. The primary objective of these measurements is to represent the relative positions of these points on a plane surface (usually paper or a digital screen) to a suitable scale. This graphical representation is called a 'Map' or a 'Plan'. Why other options are incorrect: - a. Drawing: This is a general term. While a map is a type of drawing, 'Map' is the specific technical term used in surveying. - b. Cross-Section: A cross-section is a specific type of survey result used to show the profile of the ground perpendicular to a centerline (common in road or canal works), but it is not the overall object of surveying in general. - d. Model: A model is a three-dimensional representation. While 3D models (like BIM or Digital Terrain Models) exist, the fundamental and primary object of traditional surveying is the production of a map.

In surveying, a traverse is a series of connected lines whose lengths and directions are measured. There are two main types: Closed Traverse and Open Traverse. 1. **Closed Traverse**: This is a traverse that returns to its starting point or connects to a known point. It allows for the calculation of closing errors and the distribution of those errors across the network, making it highly accurate. It is used for surveying boundaries of estates, ponds, or lakes (where the perimeter is closed). 2. **Open Traverse**: This is a traverse that starts at a known point but does not close back on itself or end at another known point. Because it does not close, there is no mathematical way to check for errors in measurement (no closing error check). Therefore, it is only used for linear features that extend over a long distance. **Analysis of Options:** - **Ponds (a) and Lakes (b)**: These are enclosed bodies of water. To map their boundaries, a closed traverse is used to ensure the perimeter is accurately closed. - **Estates (c)**: An estate has a defined boundary. A closed traverse is essential here to ensure the legal boundary of the land is correctly closed and verified. - **Rivers (d)**: Rivers are linear features that flow from one point to another over long distances. Mapping the course of a river, a road, or a railway line is the classic application of an open traverse, as the survey follows the linear path of the feature.

In surveying, there are two main types of surveying based on the consideration of the Earth's curvature: Plane Surveying and Geodetic Surveying. 1. Plane Surveying: In this method, the curvature of the earth is neglected, and the surface of the earth is treated as a plane. This assumption is acceptable for small areas where the error introduced by ignoring the curvature is negligible. 2. Geodetic Surveying: In this method, the curvature of the earth is taken into account. This is necessary for high-precision work and large areas. Standard surveying textbooks and engineering conventions establish that plane surveying is applicable for areas up to approximately 250 square kilometers. Beyond this limit, the spherical nature of the Earth becomes significant enough that the discrepancy between a plane and a sphere cannot be ignored, necessitating the use of geodetic methods. Therefore, for an area less than 250 sq km, plane surveying is the appropriate method.

An optical square is a instrument used in surveying to set out a right angle (90°) from a given line. It works on the principle of double reflection. It consists of two plane mirrors, one fixed and one movable, joined at an angle. According to the laws of reflection, the angle between the incident ray and the reflected ray is twice the angle between the two reflecting surfaces. To achieve a reflected ray that is perpendicular (90°) to the original line of sight, the mirrors must be set at an angle of 45° (since 2 × 45° = 90°). Therefore, the angle of intersection of the two plane mirrors in an optical square is 45°.

A Morphographic map is specifically designed to represent the morphology (shape and structure) of the land surface. In cartography and geomorphology, 'morphography' refers to the description of the form of the land. Therefore, a Morphographic map is synonymous with a Landform map, as it delineates different types of landforms (such as plains, plateaus, hills, and valleys) based on their physical characteristics. Analysis of other options: - a. Landslope map: This map focuses specifically on the gradient or steepness of the terrain, not the overall form/morphology. - c. Flatland-ratio map: This is a specialized map used to calculate the proportion of flat areas relative to the total area, often used in agricultural or urban planning. - d. Isogonic map: This is a map that connects points of equal magnetic declination; it is related to magnetism and navigation, not land morphology.

To determine the correct answer, we must analyze the definitions of the different types of maps provided in the options: 1. **Hypsometric Maps**: These are maps that represent the relief of the earth's surface (elevation/altitude) using colors or contours. The term 'hypsometry' specifically refers to the measurement of land elevation. Therefore, maps focusing on relief and topographical features (specifically vertical dimensions) are hypsometric. 2. **Planimetric Maps**: These maps show only the horizontal positions of features (such as roads, rivers, and buildings) but completely ignore the relief or elevation (the 'z' coordinate). Since the question asks for 'relief', planimetric maps are incorrect. 3. **Geological Maps**: These maps focus on the distribution of rock types, faults, and the age of geological formations. While they may include some topographical data for reference, their primary stress is on the composition of the earth's crust, not the relief itself. 4. **Thematic Maps**: These are general-purpose maps designed to show a particular theme connected with a specific geographic area (e.g., rainfall, population density, or soil types). While a hypsometric map is a type of thematic map, 'Hypsometric' is the more precise and specific answer for relief determination. Conclusion: Because the question specifically emphasizes 'relief' (the vertical dimension of the terrain), the Hypsometric map is the correct choice.

In Total Station surveying, there are two primary modes of distance measurement: Prism Mode and Reflectorless (Non-Prism) Mode. 1. **Prism Mode**: In this mode, the instrument emits an infrared signal that is reflected back by a glass prism. Because the prism is designed to reflect the signal with high efficiency, the signal strength remains strong over long distances. For standard professional-grade Total Stations used in land revenue and settlement surveys, the typical maximum range for prism mode is approximately 2km to 5km, depending on the instrument's specifications. Among the given options, 2km is the standard recognized upper limit for general-purpose Total Stations. 2. **Reflectorless Mode**: This mode measures distance by reflecting the signal off a surface (like a wall or rock). Because the reflection is diffuse and weak, the range is significantly shorter, typically between 100m to 1km. Comparing the options: - 500m (a) and 1km (b) are common limits for reflectorless modes or low-end equipment. - 1.5km (d) is a possible range but not the standard benchmark for the maximum capability of prism mode in technical examinations. - 2km (c) represents the standard operational range for most conventional Total Stations in prism mode.

The word 'Map' is derived from the Latin word 'Mappa', which literally means 'napkin' or 'cloth'. In ancient times, maps were often drawn on pieces of cloth or parchment, leading to the adoption of this term to describe a representation of an area of land or sea. - Option (a) Greek: While the Greeks contributed significantly to cartography (e.g., Ptolemy), the specific etymology of the word 'map' is not Greek. - Option (b) German: The word does not originate from Germanic languages. - Option (d) French: While French influenced many English words, 'map' traces back further to the Latin root.

Economic maps are thematic maps that illustrate the distribution of economic activities, resources, and infrastructure of a region. 1. Land use maps (Option a) are economic maps because they show how land is utilized for human activities (residential, industrial, commercial). 2. Transport maps (Option b) are economic maps as they detail the infrastructure (roads, railways, ports) essential for trade and commerce. 3. Agricultural maps (Option c) are economic maps because they show crop distribution and farming patterns, which are primary economic activities. 4. Vegetative maps (Option d), also known as vegetation maps, are primarily Physical maps. They describe the natural flora and biological characteristics of a region based on climate and soil, rather than human economic activity. Therefore, it is not an example of an economic map.

The Global Positioning System (GPS), operated by the United States Space Force, is designed to maintain a minimum constellation of 24 operational satellites to ensure that at least four satellites are visible from any point on Earth at any time (which is the minimum required for a 3D position fix). While the actual number of satellites in orbit often exceeds 24 (due to spares and modernization efforts like GPS III), the standard theoretical and design baseline for the GPS constellation is 24 satellites, distributed across 6 orbital planes. In the context of competitive exams for surveying, '24' is the recognized standard answer for the baseline constellation size.

In plane table surveying, an alidade is the sighting device used to draw lines of sight. There are two main types: the ordinary (plain) alidade and the telescopic alidade. 1. **Telescopic Alidade**: This is used when high precision is required or when it is necessary to take inclined sights (sighting objects at different elevations). It is equipped with a telescope and a vertical circle or a leveling bubble, allowing the surveyor to measure vertical angles or sight targets that are not on the same horizontal plane as the table. 2. **Ordinary Alidade (Option a)**: This consists of a ruler with two vanes. It is used for simple, horizontal sightings and is not suitable for inclined sights or long-distance precision. 3. **Plumbing Fork (Option c)**: This is an accessory used for centering the plane table over a specific station point on the ground; it has no sighting capability. 4. **Leveling (Option d)**: This is a process (the act of making the table horizontal), not a tool used for taking sights.

Wall maps are large-scale maps designed to be displayed on walls for educational or reference purposes. They typically represent broad regions, countries, or the entire world, focusing on physical features (mountains, rivers) and political boundaries. Therefore, they fall under the category of Geographical maps. Why other options are incorrect: - b. Atlas maps: An atlas is a collection of maps bound in a book; while the content is geographical, the 'format' of a wall map is distinct from an atlas. - c. Topographical maps: These are detailed, large-scale maps showing precise relief (contours) and man-made features of a specific small area, usually printed on sheets for field use rather than as large wall displays. - d. Cadastral maps: These are highly detailed maps showing property boundaries and land ownership (essential for Land Revenue departments), which are far too detailed to be represented as a single 'wall map' for general viewing.

Plane Table Surveying is a graphical method of surveying where field observations and plotting are done simultaneously. There are four primary methods (types) of plane tabling used to locate points and complete the survey: 1. Radiation: Used when all points to be plotted are visible from a single station. 2. Intersection: Used for locating inaccessible points by sighting them from two different stations. 3. Traversing: Used to plot a series of connected stations (similar to chain surveying but plotted on the table). 4. Resection: Used to establish the position of the plane table on the map by sighting known points (e.g., Two-point or Three-point problems). Therefore, there are 4 types of plane tabling methods.

1. A Prismatic Compass is a surveying instrument used to measure the magnetic bearing of a line. 2. The graduated ring of a prismatic compass is typically divided into degrees, and each degree is further divided into 3 equal parts by the graduations. 3. Therefore, the smallest division (least count) of a standard prismatic compass is 30 minutes (30'), not 30 seconds. 4. To convert minutes to seconds: 30 minutes = 30 × 60 seconds = 1800 seconds. 5. Comparing this to the options provided: - Option (a) 30 seconds is incorrect (it is 30 minutes). - Option (b) 45 seconds is incorrect. - Option (c) 60 seconds (which is 1 minute) is incorrect. 6. Since the actual least count is 30 minutes (or 1800 seconds), none of the given options are correct.