Soil Mechanics Revision

Rock is broken into smaller and smaller pieces over time by all of the following EXCEPT - 

• Flowing water
• Blowing wind
• Cooling sand
• Moving Ice

---rocks are formed by the cooling of the molten magma

• Sedimentary

• Igneous

• Metamorphic

• quartz

What type of rock can turn into a metamorphic rock?

• Igneous only
• Sedimentary only
• Metamorphic only
• Any type of rock

This rock formed when bits of other rocks and sediment were pressed into a solid. What type of rock is it?

• Sedimentary Rock

• Metamorphic Rock

• Igneous Rock

This type of weathering occurs when rocks weaken then break down due to chemical changes in the composition of the rock.

• mechanical weathering
• chemical weathering
• erosion weathering
• deposition

How is mechanical weathering different from chemical weathering?

• Chemical weathering happens over much shorter time frame than mechanical weathering.
• Chemical weathering changes the chemical composition of rocks; mechanical weathering does not.
• Chemical weathering occurs only in tropical climates; mechanical weathering occurs only in cool climates.
• Chemical weathering occurs only in the mountains; mechanical weathering occurs only on flat land.

What is mechanical weathering?

• process through which rocks are physically broken into smaller pieces.
• rocks are broken down through chemical changes.
• rocks are worn away from acid in plant roots.
• rocks broken down by machinery.

If the rate of weathering is more than rate of transportation of weathered material, the resulting accumulated soil is ------

• Alluvial soil

• lacustrine deposits

• residual soil

• sedimentary soil

Cohesion is a measure of the …..

• Intermolecular forces.

• Molecular forces.

• Destructive forces.

• Axial forces.

• Compressive forces.

What is c  in the following figure?

• cohesive component

• frictional component

• friction force

• cohesive force

• normal stress