Soil Science - Study Mode

[#591] The C : N ratio of saw dust is
Correct Answer

(B) 225 : 1

Explanation

Solution: The carbon to nitrogen ratio is a ratio of the mass of carbon to the mass of nitrogen in a substance. Sawdust is the by-product of woodworking operations composed of small chippings of wood. The C : N ratio of saw dust is 225 : 1.

[#592] The most electronegative element of periodic table is
Correct Answer

(C) F

Explanation

Solution: The most electronegative element of the periodic table is Flourine . Its electronegativity value is 3.98. Electronegativity is a chemical property that describes the tendency of an atom or a functional group to attract electrons toward itself. It is affected by both its atomic number and the distance that its valence electrons reside from the charged nuclei.

[#593] In remote sensing which type of radiation is utilized of photography
Correct Answer

(C) Infrared

Explanation

Solution: In remote sensing, Infrared radiation is utilized for photography. The wavelength used for photography range from about 700 nm to about 900 nm. Remote sensing is the process of detecting and monitoring the physical characteristics of an area by measuring it's reflected and emitted radiation at a distance. Special cameras collect remotely sensed images, that help researchers “sense” things about the Earth.

[#594] Match the following columns: Column I Column II a. Composition of true soil 1. Sticky soil formation b. Origin of inorganic particle 2. Steeper Slope c. Large quantities of Soil colloids 3. Mineral and organic particles d. Formation of thinner soil 4. Weathering of rocks
Correct Answer

(A) a-3, b-4, c-1, d-2

Explanation

Solution: True soil is composed of mineral and organic particles in adequate proportions for the growth and development of plants. The inorganic particles present in the soil originated from the process of weathering of rocks, i.e. continuous degradation of the rocks. Large quantities of soil colloids are the finer size fractions of the soil i.e. clay and organic matter that makes the soil sticky. The formation of the thinner soil leads to a steeper slope because the soil tends to be washed down the slopes by the rain from the slopes.

[#595] Oxidation & reduction both are seen in rock if it contains
Correct Answer

(D) All of the above

Explanation

Solution: If any rock contains Iron (Fe), Manganese (Mn) and Sulphur (S) then both the reactions like Oxidation and Reduction can be seen in such rocks. It causes chemical alterations in the rocks. Oxidation is the reaction of rock minerals with oxygen to make them resistant to weathering by causing rusting. Reduction of the rocks is the process of removal of oxygen, which mostly occurs in the waterlogged condition where there is less oxygen available.