Soil Science - Study Mode

[#716] New alluvial soil is known as
Correct Answer

(A) Khadar

Explanation

Solution: New alluvial soil is known as Khadar . Khadar soils are more fertile as they are below the flood level, composed of fine silt and clay. It is fertile land as it contains alluvial soil deposited by rivers and gets replenished with each flooding cycle. It is usually seen near the rivers, the Indo-Gangetic Plains and Yamuna khadar flood plains.

[#717] Specific heat is higher in
Correct Answer

(D) Humus

Explanation

Solution: Specific heat is the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. Specific heat is higher in Humus as the organic matter present in humus can retain more water in it and to make it cooler, the heat energy gets spent in evaporation of soil moisture.

[#718] Hysteresis is related to
Correct Answer

(C) Sorption-desorption curve

Explanation

Solution: Hysteresis is the dependence of the state of a system on its history. Hysteresis is related to the Sorption - desorption curve, which means the equilibrium moisture content is different in desorption and adsorption processes. The hysteresis between the adsorption isotherm and desorption isotherm is thought to be caused by the gradual desorption mechanism (percolation theory) due to the different size pores being combined.

[#719] The acidic igneous rocks contains silica
Correct Answer

(A) > 65 %

Explanation

Solution: The acidic igneous rocks contain silica > 65%. Acidic rock or acid rock refers to the chemical composition of igneous rocks that has 63% of SiO 2 content. Rocks described as acidic usually contain more than 20% of free quartz. Typical acidic rocks are granite or rhyolite. It was based on the idea that high silica rocks are acidic and on the contrary the rocks with low silica content are basic.

[#720] Langbeinite process is associated with manufacturing of which fertilizer?
Correct Answer

(C) K 2 SO 4

Explanation

Solution: Langbeinite process is associated with the manufacturing of K 2 SO 4 (Potassium Sulphate) fertilize. Langbeinite is a potassium magnesium sulfate mineral with the chemical formula K 2 Mg 2 (SO 4 ) 3 . Langbeinite crystallizes in the isometric-tetartoidal (cubic) system as transparent colorless or white with pale tints of yellow to green and violet crystalline masses. Langbeinite is treated with a concentrated solution of potassium chloride to yield precipitates of potassium sulfate. The precipitates of potassium sulphate are separated from the solution by decantation.