sa. S soil organic matter has a higher cation exchange capacity than cv True 4S.
ID: 293557 • Letter: S
Question
sa. S soil organic matter has a higher cation exchange capacity than cv True 4S. in wh an gstance woula the resistivity method te offectuve tor a leaky landfills? A. There are high resistivity contrasts B. There are metallic rocks around the C. The landfill is dry D. The resistivity method is effective under detervining and locating surveying orea any circumstance. 46. Humus in soil is formed from A. Plant residue, before it became sandy clay 8. Decomposed bedrocks in a well-developed soil profle C. Very dark clay minerals D. Plant residue, fully oxidized into inorganie matter 47. In urban areas and cities, groundwater pollution is a concern because of discharge of: A. Silt B. Sand C. Clay D. Effluents 48. Soil with high clay and organic matter content has high ion exchange capacity because of their A. Good water permeability B. Low density C. Well-developed O horizon D. High surface area 49. Land subsidence is most commonly associated with A. groundwater flow B. a groundwater recharge zone C. groundwater withdrawal D. all of the answers are correctExplanation / Answer
44. Cation exchange ration is considered to be the amount of poisitive charge that a material can interchange between each species in order to maintain chemicak equilibrium. Therefore the clay which contains negative charges all around its surface tends to attract more positive charges than that of simple organic matter. Therefore the statement given in the question is a false statement.
45. Resisitivity methods are generally applied for such regions where there is enough contrast between the current carrying capacity of the ionised water or liquids. So the resistivity methods are more profound to the regions where there would be great difference in resistivity in the surrounding water and the leachate in the case of leaky landfills. so the correct option would be A.
46. Humus is considered to rich in irrigational values because of large contents of decomposed organic matters in it. Therefore the correct option out of the given ones is A.
47. In cities the main agent of pollution of groundwater is said to be effluents because ultimately these garbages are dumped into the rivers and seas and hence finally disturbs the valuable content of the groundwater and its quality. Therefore the correct option is D.
48. Ion exchange capacity maximum for those substances where the material has the capability of holding positive ions in it. This is possible if the surface area of the material is increased and the more and more negative charges are brought at the surface (which is true for the clay bearing specimens). Therefore the correct option out of the given ones are D.
49. Land subsidence is the word which is associated with the aquifer systems when the water is taken out of the unconfined aquifer. Due to the decrease in the hydraulic head, the water from the confined aquifer above the unconfined aquifer moves down and hence there is a drop in the over head which stands for Land subsidence. Therefore the correct option would be D.
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