4. Choose the one best answer a, b, c to the questions.

1. What influences the choice of building materials?

a) The choice of building materials is governed by the type and the function of a building.

b) Availability, cost and physical properties are the main considerations for an engineer in selecting materials for construction.

c) The techniques and methods of construction are the main factors influencing the choice of building materials.

2. What are lime, gypsum and cement most widely used for?

a) These three materials are not widely used for the purpose of binding together masonry units.

b) They are used as components to produce concrete.

c) With the large-scale construction, lime, gypsum and cement may be considered to be the most important binding materials.