Magnetic surveys are used to detect magnetic anomalies in rocks, not water.Groundwater exploration mainly uses resistivity, seismic, and remote sensing methods.Correct Answer: Magnetic survey.
82.
What is the function of a core barrel in drilling?
A core barrel is a hollow cylinder attached to a drill rig that extracts cylindrical rock samples (cores) for geological analysis.Correct Answer: Retrieves undisturbed rock samples.
83.
Which rock type is most suitable for constructing heavy dams?
Feldspar undergoes chemical weathering and forms kaolinite, a type of clay mineral.This transformation occurs in acidic, water-rich environments.Correct Answer: Kaolinite.
85.
What is the most suitable rock structure for tunnel stability?
Massive rock with few joints provides better stability and reduces the need for heavy support systems in tunnels.Correct Answer: Massive rock with few joints.
An isopach map shows areas of equal thickness of sedimentary layers, helping in reservoir and basin analysis.Correct Answer: Equal thickness of rock units.
88.
What type of engineering structure is most affected by swelling clays?
Pavements are shallow structures, and swelling clays like montmorillonite expand and contract with moisture changes, causing heaving and cracking.Correct Answer: Pavements.
89.
What is the main concern when using limestone in areas with acidic rain?
Differential weathering occurs when softer rocks weather faster than harder rocks, leading to varied landforms like cliffs and valleys.Correct Answer: Formation of distinct landforms.