Use of Sand, Gravel, and Rocks in Construction
What are sand and gravel commonly used for?
a. Crushed aggregates
b. Natural aggregates
c. Fine soil
d. None of them
Which type of rock is used for roofing purposes and can be split into thin slabs?
a. Gneiss
b. Slate
c. Schist
d. All of them
How can the water content of a rock sample be determined?
a. 50%
b. 40%
c. 30%
d. 20%
For what purposes is crushed rock produced?
a. Covering embankments
b. Protection of sea walls
c. Subbase material
d. All of them
Answers:
a. Natural aggregates
b. Slate
c. 20%
d. All of them
Sand and gravel are natural aggregates. Slate is a rock that can be split into thin slabs and used for roofing purposes. Crushed rock is produced for various construction purposes.
Sand and Gravel:
Based on the given options, sand and gravel can be classified as natural aggregates. They are composed of small rock fragments and are commonly used in construction and landscaping.
Roofing Material:
Slate is the correct option. Slate is a type of metamorphic rock that can be split into thin slabs and is commonly used as roofing material. The water content of the rock sample can be calculated by finding the difference between the wet and dry weights and dividing it by the dry weight.
Crushed Rock Production:
The crushed rock is produced for various purposes, including covering embankments, protection of sea walls, and subbase material in construction projects.