D26 MASTER THE DAY

What is the main purpose of a roof in a building?

• Aesthetic appeal
• Structural base
• Protection from weather
• Interior design

Answer explanation

Roofs primarily provide protection against environmental factors like rain, sun, and wind.

Which of the following roof types is most suitable for heavy rainfall and snow?

• Flat roof
• Pitched roof
• Curved roof
• Dome roof

Answer explanation

Pitched or sloping roofs help to quickly drain rainwater and snow, reducing load and damage.

Which component is placed horizontally on the wall to receive common rafters?

• Cleat
• Wall Plate
• Purlin
• Batten

Answer explanation

Wall plates are horizontal timber members that receive and support the ends of rafters.

The intersection of two sloping roof surfaces forming an external angle is called a:

• Ridge
• Valley
• Hip
• Eaves

Answer explanation

Hip is the external angle or projecting edge formed when two roof slopes meet.

In which type of pitched roof does the roof slope in one direction only?

• Gable Roof
• Lean-to Roof
• Hip Roof
• Deck Roof

Answer explanation

Lean-to roofs are simple sloping roofs that incline in a single direction.

Statement 1: Queen post trusses are suitable for 5 to 8 m spans. Statement 2: Queen post trusses use two vertical posts. Choose the correct option.

• Only Statement 1 is correct
• Only Statement 2 is correct
• Both statements are correct
• Both are incorrect

Answer explanation

Queen post trusses are suitable for spans of 8 to 12 meters and use two vertical posts called queen posts.

Which of the following is a bowed roof truss designed for long spans up to 30 m?

• Fink Truss
• Howe Truss
• Belfast Truss
• King Post Truss

Answer explanation

Belfast truss is a bow-string truss that allows large spans with lightweight roof coverings.

Which of the following roof types includes a flat surface at the top with slopes in four directions?

• Mansard Roof
• Hip Roof
• Deck Roof
• Gambrel Roof

Answer explanation

Deck roofs are sloped on four sides but have a flat plane at the top.

Which member in a truss is used to prevent the purlin from sliding down?

• Rafter
• Cleat
• Batten
• Wall plate

Answer explanation

Cleat is a small block of wood fixed to the principal rafter to stop purlin movement.

What is the angle between the inclined surface of the roof and the horizontal called?

• Span
• Pitch
• Rise
• Slope Ratio

Answer explanation

Pitch refers to the inclination of the roof sides relative to the horizontal.