Soil Exploration MCQ with answer and solution

Concept

Subsurface exploration involves methods to determine the stratification and engineering properties of soils and rocks underlying a site. Tests like SPT, CPT, and Plate Load Tests are conducted for this purpose.

Step-by-step solution

1. Understand the purpose of subsurface exploration: to investigate soil and rock strata beneath a proposed construction site. 2. Evaluate Option (A): Standard Penetration Test (SPT) is an in-situ test used for determining soil shear strength and density. 3. Evaluate Option (B): Cone Penetration Test (CPT) is another in-situ test used to determine geotechnical engineering properties of soils. 4. Evaluate Option (C): Plate Load Test is a field test used to determine the ultimate bearing capacity of soil and the probable settlement under a given load. 5. Evaluate Option (D): Ductility Test is a laboratory test performed on bituminous materials (highway engineering), completely unrelated to soil exploration.

Explanation

Standard Penetration Test (SPT), Cone Penetration Test (CPT), and Plate Load Test are all standard methods used for subsurface exploration and in-situ soil testing. The Ductility Test, on the other hand, is a laboratory test used to determine the ductility of bitumen or asphalt materials, not for soil exploration.

Why the other options are wrong

A: SPT is a standard in-situ method for subsurface soil exploration. B: CPT is a widely used in-situ penetration test for soil profiling. C: Plate load test is a field test used to find bearing capacity and settlement of soils.

Shortcut

Remember that bitumen/asphalt tests include ductility, penetration, and softening point tests, whereas soil exploration involves SPT, CPT, and vane shear tests.

Common mistake

Confusing material testing of construction materials (like bitumen ductility) with geotechnical site investigation methods.