250+ TOP MCQs on Line Planned and Storeyed Buildings and Answers

Civil Engineering Drawing Multiple Choice Questions on “Line Planned and Storeyed Buildings”.

1. A __________ wall is a wall that separates rooms, or divides a room. Partition walls are usually not load-bearing.
a) drawf wall
b) partition wall
c) main wall
d) large wall
Answer: b
Clarification: A partition wall is a wall that separates rooms, or divides a room. Partition walls are usually not load-bearing. Partition walls are constructed of many materials, including steel panels, bricks, blocks of clay, terra-cotta, concrete, or glass blocks.
Some partition walls are made of sheet glass. Glass partition walls are a series of individual toughened glass panels mounted in wood or metal framing. They may be suspended from or slide along a robust aluminium ceiling track. The system does not require the use of a floor guide, which allows easy operation and an uninterrupted threshold.

2. ___________ are walls that separate buildings or units within a building. They provide fire resistance and sound resistance between occupants in a building
a) Shear wall
b) Fire wall
c) Party walls
d) Knee wall
Answer: c
Clarification: Party walls are walls that separate buildings or units within a building. They provide fire resistance and sound resistance between occupants in a building. The minimum fire resistance and sound resistance required for the party wall is determined by a building code and may be modified to suit a variety of situations. Ownership of such walls can become a legal issue. It is not a load-bearing wall and may be owned by different people.

3. ___________ include privacy walls, boundary-marking walls on property, and town walls. These intergrade into fence.
a) Border wall
b) Shared wall
c) Boundary walls
d) Temporary wall
Answer: c
Clarification: Boundary walls include privacy walls, boundary-marking walls on property, and town walls. These intergrade into fences. The conventional differentiation is that a fence is of minimal thickness and often open in nature, while a wall is usually more than a nominal thickness and is completely closed, or opaque. More to the point, an exterior structure of wood or wire is generally called a fence—but one of masonry is a wall.

4. A __________ is a roofed, open-air gallery or porch. A veranda is often partly enclosed by a railing and frequently extends across the front and sides of the structure.
a) balcony
b) veranda
c) terrace
d) chowkhat
Answer: b
Clarification: A veranda or verandah (from Portuguese varandaa) is a roofed, open-air gallery or porch. A veranda is often partly enclosed by a railing and frequently extends across the front and sides of the structure.
Although the form “verandah” is correct and very common, some authorities prefer the version without an h (the Concise Oxford English Dictionary gives the h version as a variant and the Guardian Style Guide says “veranda not verandah”.

5. ___________ are a set of drawings or two-dimensional diagrams used to describe a place or object, or to communicate building or fabrication instructions.
a) Elevations
b) Plans
c) Plotting
d) Sketching
Answer: b
Clarification: Plans are often for technical purposes such as architecture, engineering, or planning. Their purpose in these disciplines is to accurately and unambiguously capture all the geometric features of a site, building, product or component. Plans can also be for presentation or orientation purposes, and as such are often less detailed versions of the former. The end goal of plans is either to portray an existing place or object, or to convey enough information to allow a builder or manufacturer to realize a design.

6. Which type of estimate is prepared by calculating building area and then multiplying area by predefined unit cost?
a) Unit Based Estimate
b) Model estimate
c) Project Comparison Estimate
d) Parametric estimate
Answer: a
Clarification: This type of estimate is prepared by calculating building area and then multiplying area by predefined unit cost. And then adjusted the cost by considering building height, length, width and other necessary building components. Required documents for preparing this type of estimate is a simple floor plan with measurement and key elevation of the building. This type of estimation is used to check whether the project was designed within owner’s budget.

7. Name the method, where an estimator prepares estimate of proposed project by comparing similar completed project.
a) Model estimate
b) Parametric estimate
c) Project Comparison Estimate
d) Detail Estimate
Answer: c
Clarification: In this method, an estimator prepares estimate of proposed project by comparing similar completed project. After preparing the comparison estimate, estimator makes adjustment for variation of proposed project with the completed project.

8. In case of laying gullies, siphons, intercepting traps, the cost also includes __________
a) setting and laying
b) bed concreting
c) connection to drains
d) setting, laying, bed concreting and connection to drains
Answer: d
Clarification: A gully is a landform created by running water, eroding sharply into soil, typically on a hillside. Gullies resemble large ditches or small valleys, but are metres to tens of metres in depth and width.
The word siphon is used to refer to a wide variety of devices that involve the flow of liquids through tubes. In a narrower sense, the word refers particularly to a tube in an inverted ‘U’ shape, which causes a liquid to flow upward, above the surface of a reservoir, with no pump, but powered by the fall of the liquid as it flows down the tube under the pull of gravity, then discharging at a level lower than the surface of the reservoir from which it came.
Intercepting traps fitted in the length of a house drain, close to its connection to the sewer, which provides a water seal against foul gases rising up into the drain.

250+ TOP MCQs on Estimation of Basic Rates Occurred and Answers

Basic Civil Engineering Drawing Questions and Answers on “Estimation of Basic Rates Occurred”.

1. __________ is the built up covered area of a building measured at floor level of any storey.
a) Covered area
b) Carpet area
c) Total area
d) Plinth area
Answer: d
Clarification: Plinth area is calculated by taking the external dimensions of the building at the floor level excluding plinth offsets if any. Court-yard, open areas, balconies and cantilever projections are not included in the plinth area.

2. ____________ is a list or schedule of quantities of all the possible items of work required for construction of any building or structure.
a) Quality survey
b) Rate list
c) Quantity survey
d) Rate schedule
Answer: c
Clarification: These quantities are worked from the plan and drawing of the structure. Thus the quantity survey indicates the quantities of work to be done under each item which when priced per unit gives the amount of cost.

3. _________________ area of a building is the area of verandahs, passage, corridors, balconies, porches, etc.
a) Floor area
b) Horizontal circulation area
c) Vertical circulation area
d) Verandah area
Answer: b
Clarification: It is required for the horizontal movement of the users of building. This may be 10% to 15% of the plinth area of the building.

4. ___________ of building is the useful area or liveable area or lettable area. This is the total floor area minus the circulation area, verandahs, corridors, passages, staircase, lifts, entrance hall, etc. minus other non-useable areas.
a) Plinth area
b) Floor area
c) Carpet area
d) Circulation area
Answer: c
Clarification: For office building carpet area is the lettable area or useable area and for residential building carpet area is the liveable area and should exclude the kitchen, pantry, stores and similar other room which are not used for living purpose.

5. ______________ include general office expenses, rents, taxes, supervision and other costs which are indirect expenses and not productive expenses on the job.
a) Total costs
b) General costs
c) Overhead costs
d) Contingencies
Answer: c
Clarification: The miscellaneous expenses on overheads may be under the following heads- General overheads, Job overheads.

6. The capacity of doing work by an artesian or skilled labour in the form of quantity of work per day is known as the ______________
a) over-turn
b) in-turn
c) out-turn
d) out-come
Answer: c
Clarification: The out-turn of work per artesian varies to some extend according to the nature, size, height, situation, location, etc. In bigger cities where specialised and experienced labour is available the out-turn is greater than small towns and country sides.

7. In earthwork per 28.30 cu m, how many beldars and mzdoors are required per day?
a) 15 Beldars and 8 Mazdoors
b) 0 Beldars and 14 Mazdoors
c) 2 Beldars and 0 Mazdoors
d) 5 Beldars and 4 Mazdoors
Answer: d
Clarification: Excavation in foundation, trenches, etc. in ordinary soil including disposal up to 30 m(100’) and lift of 1.5 m (5’).

8. In flooring how many masons, beldars, mazdoors and bhishti per day are required?
a) 4 Beldars, 10 Mazdoors, 10 Masons and 8 Bhishti
b) 4 Beldars, 3 Mazdoors, 5 Masons and 1 Bhishti
c) 9 Beldars, 13 Mazdoors, 5 Masons and 1 Bhishti
d) 3 Mazdoors, 5 Masons and 10 Bhishti
Answer: b
Clarification: 4 cm thick cement concrete flooring of 40 sq m require-4 Beldars, 3 Mazdoors, 5 Masons and 1 Bhishti per day for mixing, laying and finishing.

9. A bullock cart can carry about _________ load.
a) 3 tonne
b) 1 tonne
c) 5 tonne
d) ½ tonne
Answer: b
Clarification: The average speed for a bullock cart may be taken as 3.20 km( 2 units) per hour and ¾ hour may be allowed for loading and unloading. Taking 8 hours working per day, the number of trips per day can be calculated.

10. The approximate cost of a building of cubic content of 400 cu [email protected] Rs.180/- per cu m is __________
a) Rs. 92000/-
b) Rs. 12000/-
c) Rs. 72000/-
d) Rs. 42000/-
Answer: c
Clarification: Cube rate estimate is most accurate as compared to the plinth area estimate as the height of the building is also compared.

11. The carpet area of an office building may be 60% to 75% of plinth area of the building with a target of 75%.
a) True
b) False
Answer: a
Clarification: The planners should aim to achieve a target of 75% of the plinth area. The carpet area of residential building may be 50% to 65% of the plinth area of building with a target of 65%.

12. For a framed multi-storeyed building the area occupied by wall may be 50% to 70% of the plinth area.
a) True
b) False
Answer: b
Clarification: For a framed multi-storeyed building the area occupied by wall may be 5% to 10% of the plinth area. (a standard 3% for external walls and 2% for internal walls). For ordinary building without frame, the area occupied by walls may be 10% to 15% of the plinth area.

13. For panelled, glazed, etc., shutters- 15 carpenters and 4 beldars can make and fix 4 shutters 40 mm thick size 2.00m*1.15m.
a) True
b) False
Answer: a
Clarification: 112’’ thick of size of 6’-9”*3’-9” per day. Quantity of wood per shutter -0.075 cu m, i.e., 2.66 cu ft.

14. Centring and shuttering for flat surfaces- 4 beldars and 4 carpenters (2 class) can do 9.6 sq m (96 sq ft) per day.
a) True
b) False
Answer: a
Clarification: Reinforcement work for R.C.C.- 1 blacksmith or fitter and 1 beldar can bend and place in position 1 quintal (2 cwt) of steel per day.

15. Laying cement concrete – 6beldars, 8 mazdoors, ¾ Bhishti and ¼ mason can do 2.83 cu m(100 cu ft) per day.
a) True
b) False
Answer: b
Clarification: Laying cement concrete – 2 beldars, 3 mazdoors, ¾ Bhishti and ¼ mason can do 2.83 cu m(100 cu ft) per day.

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250+ TOP MCQs on Roof Covering, Sloping Roof & Flat Terraced Roof and Answers

Civil Engineering Drawing online quiz on “Roof Covering, Sloping Roof & Flat Terraced Roof”.

1. An ____________ is in a pure compression form.
a) arch
b) hinge
c) rigid
d) truss
Answer: a
Clarification: It can span a large area by resolving forces into compressive stresses and, in turn eliminating tensile stresses. This is sometimes referred to as arch action. As the forces in the arch are carried to the ground, the arch will push outward at the base, called thrust. As the rise, or height of the arch decreases, the outward thrust increases. In order to maintain arch action and prevent the arch from collapsing, the thrust needs to be restrained, either with internal ties or external bracing, such as abutments.

2. A wooden roof is a roofing system made from metal pieces or tiles characterized by its high resistance, impermeability and longevity.
a) True
b) False
Answer: b
Clarification: A metal roof is a roofing system made from metal pieces or tiles characterized by its high resistance, impermeability and longevity. Metal roofs can last up to 100 years, with installers providing 50 year warranties. Because of their longevity, most metal roofs are less expensive than asphalt shingles in the long term.
Metal roofing can consist of a high percentage of recycled material and is 100% recyclable. It does not get as hot as asphalt a common roofing material, and it reflects heat away from the building underneath in summertime.

3. The four-sided slopes are not the characteristic feature of only Mansard roofs; the _______________ also come with this feature.
a) amnsard roof
b) gambrel Roof
c) salt Box Roof
d) pyramid roof
Answer: a
Clarification: The four-sided slopes are not the characteristic feature of only Mansard roofs; the Pyramid roofs also come with this feature. As the name suggests, these roofs are shaped like pyramids, a roof with four sloping sides. These roofs are best-suited for smaller structures, like a farmhouse hut. These roofs are popular in the contemporary architecture, with many structures getting these roofs. The walls of these houses are symmetrical and easy to build. A lower degree pitch works best for such four-sided roofs. They would work even better if the walls were smaller and the roof made for a significant part of the house. It is not only aesthetically pleasing, but also more energy efficient.

4. _________ is one of the most efficient types of timber roof trusses.
a) Raised Heel Roof Truss
b) Quadrangular Roof Trusses
c) Parallel Chord Roof Truss
d) Scissor Roof Truss
Answer: a
Clarification: This is one of the most efficient types of timber roof trusses, mostly because it brings very good room for insulation, but at the same time it also provides you with a very good system for structural support. It might require some additional materials in order to make it bring the best results, not to mention that the costs can be a little higher when compared to other truss types, but it does help you lower the energy bill value, so keep that in mind.

5. ________ are found in traditional buildings in regions with a low precipitation.
a) Flat roof
b) Mono-pitched roof
c) Gable
d) Arched roof
Answer: a
Clarification: Modern materials which are highly impermeable to water make possible the very large low-pitch roofs found on large commercial buildings. Although called flat they are generally gently pitched.

6. Figure shown below represents ________
civil-engineering-drawing-questions-answers-online-quiz-q6
a) Barrel roof
b) Dutch gable, gablet
c) Saw-tooth roof
d) Butterfly roof
Answer: d
Clarification: A butterfly roof (sometimes called a V roof or London roof) is a form of roof characterized by an inversion of a standard roof form, with two roof surfaces sloping down from opposing edges to a valley near the middle of the roof. It is so called because its shape resembles a butterfly’s wings. Butterfly roofs are commonly associated with mid-century modern architecture. The form has no gutter as rainwater can run off the roof in no more than two locations, at either end of the valley, often into a scupper or downspout. The form may be symmetrical, with the valley located in the center, or asymmetrical with an off-center valley.

7. Figure shown below represents ____________
civil-engineering-drawing-questions-answer-covering-sloping-flat-roof-q7
a) flat roof
b) clerestory roof
c) shed roof
d) gable roof
Answer: c
Clarification: A mono-pitched roof, often referred to as a pent roof, shed roof, lean-to roof, and/or skillion roof, is a single-sloped roof surface, often not attached to another roof surface. This is in contrast to a dual-pitched roof, also known as a gabled roof, which is pitched in two different directions.

8. Timber cannot be used as a sloping roof.
a) True
b) False
Answer: b
Clarification: A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. Trusses usually occur at regular intervals, linked by longitudinal timbers such as purlins. The space between each truss is known as a bay.
Timber roof trusses were a medieval development. Earlier roofs had been supported by coupled rafters – pairs of rafters linked by horizontal beams. But such roofs were structurally weak, and lacking any longitudinal support were prone to racking, a collapse resulting from horizontal movement.

9. Roofing material is the outermost layer on the roof of a building, sometimes self-supporting, but generally supported by an underlying structure.
a) True
b) False
Answer: a
Clarification: A building’s roofing material provides shelter from the natural elements. The outer layer of a roof shows great variation dependent upon availability of material, and the nature of the supporting structure. Those types of roofing material which are commercially available range from natural products such as thatch and slate to commercially produced products such as tiles and polycarbonate sheeting. Roofing materials may be placed on top of a secondary water-resistant material called underlayment.

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250+ TOP MCQs on Planning Layout of Residential buildings and Answers

Civil Engineering Drawing Multiple Choice Questions on “Planning Layout of Residential buildings”.

1. For residential building the liveable area should be 50% to 65% of the plinth area.
a) True
b) False

Answer: b
Clarification: For residential building the liveable area should be 50% to 65% of the plinth area. The circulation area should be minimum possible depending on the climatic condition of the region.

2. Drawing room should be light and ventilated and located in the heart of the building.
a) False
b) True

Answer: b
Clarification: For orthodox families observing purda, the drawing room may be placed in the front, having a verandah in the front and a lobby or dining room in the rear. Drawing room serves as recreation room, a study room, entertaining room for guests and visitors and a congregation room on special occasions of marriages, religious functions, etc.

3. Bedroom should not be placed on the sides of the building.
a) True
b) False

Answer: b
Clarification: It should be placed with at least one wall exposed to the outer space for ventilation and light. They should be placed on the sides of the prevailing wind with sufficient windows and ventilators having sun shades to protect against sun and rain.

4. Kitchen should be placed opposite to the direction of the prevailing wind.
a) True
b) False

Answer: b
Clarification: Kitchen should be placed opposite to the direction of the prevailing wind so that smoke may not enter into the other rooms of these building. It is better to have kitchen in a separate wing or block or disconnected with a lobby and windows and chimney for smoke to escape.

5. The minimum width of staircase should be 0.9 m clear of railing and may range up to 1.5 m.
a) True
b) False

Answer: a
Clarification: There should be a clear head-way of 2.1 m above each step and landing. The staircase should be constructed in two flights having a landing in the middle to make it easy and comfortable to climb.

6. Which factor is not considered on studying of site?
a) Number of gender ratio
b) Study of site with respect to other surrounding sites
c) Study of geographical and geological conditions of site
d) Location site

Answer: a

7. What should the planner must have an interaction with the master/residents to understand the following?
a) Aim/object/purpose of building
b) Number of people using the building
c) Type of people, their education, awareness
d) Dressing sense of the people

Answer: d
Clarification: After theses studies planner must have an interaction with the master/residents to understand the following:
i. Aim/object/purpose of building
ii. Number of people using the building
iii. Type of people,their education,awareness
iv. Art and culture of the people
v. What are the expected actions and interations of people
vi. Maximum and minimum requirements of the people
vii. Their expection about maintanence of the building.

8. Which among the following is not a principle of planning?
a) Furniture requirements
b) Aspect
c) Prospect
d) Respect

Answer: d
Clarification: *Aspect- Is meant for arrangement of doors and windows 1n the external walls of the bui1iding wh1ch allows the natural gifts of sun shine and air, scenery etc.
*Prospect- is determine by the views desired from certain rooms of the house and is interest by surroundings peculiarities of selected site
*Furniture requirements- it 1s the functional requirement of a room decides the required furniture.

9. ____________ refers to the effect produced by deriving the maximum benefits from the minimum dimensions off a room.
a) Compactness
b) Roominess
c) Grouping
d) Privacy

Answer: b
Clarification: Giving due importance to the furniture placement in the room. Factors effecting of roominess are- size of the room, shape, furniture used, position of doors, windows.

10. __________ is nothing, but the movement.
a) Circulation
b) Privacy
c) Grouping
d) Ventilation

Answer: a
Clarification: It is nothing but the movement. This is two types of circulation – Horizontal Circulation, Vertical Circulation
Horizontal circulation: It is the circulation on the same floor, Vertical circulation: It nothing but the movement of upward and downward movement.

250+ TOP MCQs on Oblique Projection and Answers

Civil Engineering Drawing Multiple Choice Questions on “Oblique Projection”.

1. When the receding lines are true length, and the projectors are at 45 degrees to the plane of projection, the oblique drawing is called ______________
a) oblique projection
b) isometric projection
c) axonometric projection
d) cavalier projection

Answer: d

2. In oblique projections, the projectors are perpendicular to each other but are not parallel to the plane of projection.
a)True
b)False

Answer: b
Clarification: Oblique projection is a type of parallel projection:
• It projects an image by intersecting parallel rays (projectors)
• From the three-dimensional source object with the drawing surface (projection plane).
In both oblique projection and orthographic projection, parallel lines of the source object produce parallel lines in the projected image. The projectors in oblique projection intersect the projection plane at an oblique angle to produce the projected image, as opposed to the perpendicular angle used in orthographic projection.

3. In general, all types of sections for isometric drawing may be applied to oblique drawing.
a) True
b) False

Answer: b
Clarification: An isometric projection is a technical way of representing an object in three dimensions and may include several oblique views of the object. It’s used extensively in engineering and manufacturing to provide an accurate and detailed view of how an object is designed or put together, whereas an oblique view will always show the object as being perfectly flat with respect to the picture plane (I.e., that particular face of the object will have only two dimensions from the viewer’s point of view).

4. In oblique projections, one of the object’s principal faces is parallel to the plane of projection.
a) True
b) False

Answer: a
Clarification: In both oblique projection and orthographic projection, parallel lines of the source object produce parallel lines in the projected image. The projectors in oblique projection intersect the projection plane at an oblique angle to produce the projected image, as opposed to the perpendicular angle used in orthographic projection.

5. Oblique sections are useful to show the _____________
a) interior shapes
b) oblique lines
c) foreshortened features
d) projected features

Answer: a
Clarification: Oblique drawing is also the crudest “3D” drawing method but the easiest to master. One way to draw using an oblique view is to draw the side of the object you are looking at in two dimensions, i.e. flat, and then draw the other sides at an angle of 45°, but instead of drawing the sides full size they are only drawn with half the depth creating ‘forced depth’ – adding an element of realism to the object. Even with this ‘forced depth’, oblique drawings look very unconvincing to the eye. For this reason oblique is rarely used by professional designers and engineers.

6. The term __________ stems from its use in illustrations by the furniture industry.
a) cavalier projection
b) axonometric projection
c) cabinet projection
d) dimetric projection

Answer: c
Clarification: The term cabinet projection (sometimes cabinet perspective) stems from its use in illustrations by the furniture industry. Like cavalier perspective, one face of the projected object is parallel to the viewing plane, and the third axis is projected as going off in an angle (typically 30° or 45° or arctan (2) = 63.4°). Unlike cavalier projection, where the third axis keeps its length, with cabinet projection the length of the receding lines is cut in half.

7. In _________a point of the object is represented by three coordinates, x, y and z.
a) axonometric projection
b) cavalier projection
c) cabinet projection
d) military projection

Answer: b
Clarification: In cavalier projection (sometimes cavalier perspective or high view point) a point of the object is represented by three coordinates, x, y and z. On the drawing, it is represented by only two coordinates, x″ and y″. On the flat drawing, two axes, x and z on the figure, are perpendicular and the length on these axes are drawn with a 1:1 scale; it is thus similar to the dimetric projections, although it is not an axonometric projection, as the third axis, here y, is drawn in diagonal, making an arbitrary angle with the x″ axis, usually 30 or 45°. The length of the third axis is not scaled.

8. A variant of ___________ is called military projection.
a) 3- projection
b) Orthographic projection
c) Isometric projection
d) Oblique projection

Answer: d
Clarification: A variant of oblique projection is called military projection. In this case the horizontal sections are isometrically drawn so that the floor plans are not distorted and the verticals are drawn at an angle. The military projection is given by rotation in the xy-plane and a vertical translation an amount z.

250+ TOP MCQs on Jack Arched and Flat Terraced Roof and Answers

Civil Engineering Drawing Multiple Choice Questions on “Jack Arched and Flat Terraced Roof”.

1. Unlike regular arches, jack arches are not semicircular in form.
a) False
b) True

Answer: b

2. An apartment (or flat in Britain and most other Common wealth countries) is a self-contained housing unit that occupies only part of a building.
a) True
b) False

Answer: a
Clarification: Such a building may be called an apartment building, apartment complex, flat complex, block of flats, tower block, high-rise or, occasionally, mansion block (in British English), especially if it consists of many apartments for rent. In Scotland, it is called a block of flats or, if it is a traditional sandstone building, a tenement, a term which has a pejorative connotation in the United States. Apartments may be owned by an owner/occupier, by leasehold tenure or rented by tenants (two types of housing tenure).

3. The most reliable estimate is Cube rate estimate.
a) True
b) False

Answer: b
Clarification: The most reliable estimate is detailed estimate. Detailed estimating, sometimes referred to as “Prime Cost”, “Bottoms Up” or “Grass Roots” estimating requires a thorough and detailed analysis of all the tasks required to deliver a project or product. The estimate can be developed using a combination of estimating methods.

4. The damp proof course (D.P.C.) is measured in Sq m.
a) True
b) False

Answer: a
Clarification: General principles to be observed while laying damp proof course are:
i. The DPC should cover full thickness of walls excluding rendering.
ii. The mortar bed upon which the DPC is to be laid should be made level, even and free from projections. Uneven base is likely to cause damage to DPC.
iii. When a horizontal DPC is to be continued up a vertical face a cement concrete fillet 75mm in radius should be provided at the junction prior to the treatment.
iv. Each DPC should be placed in correct relation to other DPC so as to ensure complete and continuous barrier to the passage of water from floors, walls or roof.

5. The fixed arch is most often used in reinforced concrete bridge and tunnel construction, where the spans are short.
a) False
b) True

Answer: a
Clarification: Because it is subject to additional internal stress caused by thermal expansion and contraction, this type of arch is considered to be statically indeterminate.

6. An arch is a pure compression form.
a) True
b) False

Answer: a
Clarification: It can span a large area by resolving forces into compressive stresses and, in turn eliminating tensile stresses. This is sometimes referred to as arch action. As the forces in the arch are carried to the ground, the arch will push outward at the base, called thrust. As the rise, or height of the arch decreases, the outward thrust increases. In order to maintain arch action and prevent the arch from collapsing, the thrust needs to be restrained, either with internal ties or external bracing, such as abutments.

7. A ____________ is a structural element in masonry construction that provides support at openings in the masonry. Alternate names are “flat arch” and “straight arch”.
a) round arch
b) equilateral arch
c) flamboyant arch
d) jack arch

Answer: d
Clarification: Unlike regular arches, jack arches are not semicircular in form. Instead, they are flat in profile and are used under the same circumstances as lintels. Unlike lintels, which are subject to bending stress, jack arches are composed of individual masonry elements cut or formed into a wedge shape that efficiently uses the compressive strength of the masonry in the same manner as a regular arch.