Grading materials and weather resistance

What is the main reason for testing the strength and stability of a building?

• To ensure the building is safe and durable

• To make the building look attractive

• To reduce the cost of construction

• To increase the speed of construction

Answer explanation

To ensure the building is safe and durable

Timber is used in buildings to create structures such as:

• Furniture

• Bridges

• Building frameworks

• Boats

Answer explanation

Timber is primarily used in buildings to create structures such as building frameworks, making it the correct choice.

How is concrete with a strength of 25 N/mm² specified?

• C25

• C20

• C30

• C15

Answer explanation

Concrete with a strength of 25 N/mm² is specified as C25. The 'C' stands for concrete, and the number represents the strength in N/mm².

Convert the concrete strength of 9 N/mm² into the correct code.

(a)  

How is Deciduous timber classified?

• As C and ranges from C14 to C50

• As D and ranges from D30 to D70

• As E and ranges from E10 to E40

• As F and ranges from F20 to F60

Answer explanation

Deciduous timber is classified as D and ranges from D30 to D70, as mentioned in the correct answer choice.

Which of the following is an example of a Deciduous tree?

• Hick's Yew

• Deodar Cedar

• Oak tree

• Sugar pine

Answer explanation

The correct choice is Oak tree because it is an example of a Deciduous tree, shedding its leaves annually.

Which of the following is a characteristic of PVC mentioned in the document?

• It is biodegradable

• It is very weather resistant against water

• It is a natural material

• It is transparent

Answer explanation

The correct characteristic of PVC mentioned in the document is that it is very weather resistant against water.

What is the primary purpose of the slopes provided on outer frames of doors and windows?

• To enhance the building's appearance

• To provide additional support

• To shed water off

• To allow for better ventilation

Answer explanation

The primary purpose of the slopes provided on outer frames of doors and windows is to shed water off, preventing water damage and ensuring proper drainage.