Geology Test 1 Nddc Scholarship
Geology Test 1 Nddc Scholarship
Question 101
A formation which transmits water at a very low rate (e.g., sandy clay, fractured shales, silts) forms an:
An aquitard is a saturated geological unit that allows water to move through it, but at a very slow rate compared to an aquifer. It has enough permeability to transmit water on a regional scale but is not porous/permeable enough to provide a sufficient supply for a well.
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Question 102
Maps having contour lines connecting points of equal depths of precipitation are called:
Isohyetal maps use lines called isohyets to connect geographic locations that receive the same amount of rainfall during a specific period. These are essential tools in meteorology and hydrology for visualizing the distribution of precipitation over an area.
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Question 103
Regarding grain packing and porosity for uniform grain sizes, choose the correct statement:
The arrangement of grains significantly affects porosity. Cubic packing is the loosest possible arrangement with a theoretical porosity of ~47.6%. Rhombohedral packing (the tightest) has a much lower porosity of ~26.0%. Therefore, cubic packing is much more porous.
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Question 104
The process of formation of deposits from channels at or near the surface is described as:
Epigenetic deposits are mineral deposits formed later than the rocks in which they are found. This occurs when mineral-bearing fluids circulate through existing rock channels (fractures, pores) at or near the surface and precipitate minerals within them.
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Question 105
Pegmatites are described as:
Pegmatites are exceptionally coarse-grained igneous rocks, usually of granitic composition. They form during the final stages of a magma's crystallization when high water content allows large crystals (sometimes meters long) to grow rapidly.
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Question 106
Which of the following is an endogenetic deposit?
Endogenetic processes originate within the Earth. Fumarolic deposits are formed from gases and vapors released from magma that precipitate minerals as they cool near the surface. The other options involve exogenetic processes like weathering or surface sedimentation.
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Question 107
The deposits formed at the end of magmatic differentiation are termed as:
Hydrothermal deposits form during the final stages of magmatic cooling. As the magma crystallizes, hot, mineral-rich aqueous fluids are expelled into the surrounding rock, where they cool and precipitate minerals in veins or disseminated deposits.
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Question 108
In a compaction test, maximum dry density is achieved at a particular moisture content called:
The Optimum Moisture Content (OMC) is the specific water content at which a soil can be compacted to its maximum dry unit weight. Adding water beyond this point starts to displace soil particles, leading to a decrease in density.
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Question 109
Coal deposits are formed in which environment?
Coal forms from the accumulation of terrestrial plant matter in stagnant, anaerobic conditions like swamps or deltas. It is a continental or marginal-marine deposit. Since none of the provided locations (Deep Marine, Continental Slope) are correct, 'None of these' is the answer.
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Question 110
In a stratigraphic trap, the chief trap-making element is:
A stratigraphic trap is formed by changes in rock type (lithology) or the 'pinching out' of a reservoir layer. This creates variations in porosity and permeability that prevent hydrocarbons from migrating further, effectively trapping them without the need for structural folding or faulting.
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