1. How many types of composition shingles are there?
a) 2
b) 3
c) 4
d) 5
Explanation: The two types of composition shingles are organic and fibreglass. It is used to cover pitched or sloping roofs.
2. Synthetic slate is made from:
a) Isoprene
b) Fibre cement
c) Plastic fibres
d) Resin
Explanation: The fibres in fibre cement are usually wood or cellulose. These cannot be used in freeze-thaw climates, as the fibres may absorb water.
3. Mission or barrel roof tiles are:
a) Flat
b) Semi-cylindrical
c) Curved
d) Semi-circular
Explanation: The barrel tiles are semi-cylindrical in shape. They are laid in alternating columns of convex and concave tiles. They can be produced from clay, metal, concrete or plastic.
4. ________ coating is applied on a metal roof to improve heat – reflective properties.
a) Paint
b) Oil
c) Ceramic
d) Zinc
Explanation: Paint and Zinc is applied to give a good appearance and to prevent corrosion. Oils are used to enhance appearance by bringing out the colour and lustre. It also excludes moisture from copper roofs.
5. The simplest form of wood shingle is:
a) Split
b) Straight
c) Rectangular
d) Tapered
Explanation: There can be different shapes of wood shingles and shakes. They can be tapered, straight, split or sawn and any two of the above can be combined, except straight-tapered. Rectangular shingles of 14cm length is the simplest form.
6. Liquid roofing is the process of:
a) Water proofing roofs
b) Painting roofs
c) Using glass for roofing
d) Curving R.C.C. roofs
Explanation: It refers to the application of a special liquid coating to any type of roofs. The coating then cures and forms a rubber like water proof membrane. It is cost effective, safe, easy to apply and highly reliable.
7. The CGI sheets produced today, have the pitch of:
a) 1 inch
b) 3 inches
c) 5 inches
d) 7 inches
Explanation: Pitch is the distance between two crests in a corrugated sheet. In corrugated galvanized Iron (CGI) sheets, pitch can range from 1-5 inches. Commonly produced one these days is 3 inch one.
8. Straw thatch roof may last for 50-60 years.
a) true
b) false
Explanation: Straw thatch and reed thatch are both used after dipping them in fire resistant solutions. Straw thatch is more likely to catch fire, absorb more moisture than reed thatch. Straw thatch can last for 20-25 years while reed thatch can last for 50-60 years.
9. Which of the below ratio is used for R.C.C. roofing?
a) 1:1:2
b) 1.5:1:3
c) 1:2:4
d) 1:1.5:3
Explanation: The R.C.C. is used for flat roofs. The most commonly used ratio is 1:1.5:3.
10. Which type of floor is used for residential buildings?
a) Ground timber floor
b) Single joist timber floor
c) Double joist timber floor
d) Framed timber floor
Explanation: In residential buildings, the span is less and loads to be carried are light. So, a single joist timber can be used.