1. Ridge piece in a sloping roof is usually a:
a) Metal
b) Wood
c) Polymer
d) PVC
Explanation: Ridge piece runs horizontally at the apex. Rafters are then affixed on to this. It is usually a wooden piece or board.
2. How many types of sloping roofs are available?
a) 2
b) 10
c) 5
d) 6
Explanation: There are 6 types of sloping roofs available. They are steel sloping roofs, lean-to-roofs, couple roofs, couple close roofs, collar beam roofs and trussed roofs.
3. Timber trusses can be built for long spans.
a) true
b) false
Explanation: Steel trusses are mostly used for longer spans. These are easy to fabricate, install and maintain. They have higher resistance to fire, corrosion (painting) etc….
4. A finishing coat with ________ ratio is provided in Punjab terrace roofs.
a) 1:4
b) 1:2
c) 4:1
d) 2:1
Explanation: The finishing coat primarily consists of cow dung and cement mixed together. They are taken in 4:1 ratio, that is 4 parts cow dung to 1 part cement.
5. Which of the below roof types can be used for a span of 4.5 m??
a) Couple close roof
b) Lean-to-roof
c) Couple roof
d) Collar beam roof
Explanation: Lean-to-roof is usually employed for a span of 2.5m. Couple roof is provided where a span of 3.5m is required. Collar beam roof can be used up to the span of 4-6m.
6. A gable roof slopes in ________ direction.
a) 1
b) 3
c) 2
d) 4
Explanation: A gable roof slopes in two directions in such a way that the end formed by the intersection of slopes is a sloped triangle. It is commonly used in houses, workshops, etc.
7. How many layers of flat tiles are placed in Madras terrace roofs?
a) 2
b) 4
c) 0
d) 3
Explanation: In Madras terrace roof, firstly wooden joists are placed over steel joists or walls. Then, a course of well burnt bricks is placed in the lime mortar, followed by a layer of brick bat concrete. Then 3 layers of flat tiles in the lime mortar (1:2) is provided and the roof is finished with 3 coats of plaster.
8. Which of the below is the type of folded plate roof?
a) Prismatic
b) Cylindrical
c) Corrugated shell
d) Ellipsoidal
Explanation: Folded plate roofs may be defined as slabs with folds. These folds reduce bending moment and shear force considerably. Cylindrical, Corrugated shell and Ellipsoidal are types of shell roofs.
9. Thin pieces of split or sawn wood are called:
a) Thatch
b) Ribbon
c) Shingles
d) Ply
Explanation: Shingles are commonly used in hilly areas and for building low cost houses. They are nailed to supporting structure to make roof covering.
10. EPDM Rubber is generally used for:
a) 3-in-12 pitch
b) 4-in-12 slope
c) 2-in-12 slope
d) Flat roofs
Explanation: EPDM Rubber is ethylene propylene diene monomer. It is used to create a single-ply rubberized roof for a flat or a very low slope roof. It is UV resistant.