The porosity is measured by
A. $${\text{P}} = 100 - \left( {\frac{{{\text{Bulk Density}}}}{{{\text{Particle Density}}}}} \right)$$
B. $${\text{P}} = \left( {\frac{{{\text{Bulk Density}}}}{{{\text{Particle Density}}}}} \right) \times 100$$
C. $${\text{P}} = 100 - \left( {\frac{{{\text{Bulk Density}}}}{{{\text{Particle Density}}}}} \right) \times 100$$
D. $${\text{P}} = 100 - \left( {\frac{{{\text{Particle Density}}}}{{{\text{Bulk Density}}}}} \right) \times 100$$
Answer: Option C
Solution(By Examveda Team)
Porosity is the measure of empty spaces in the soil. The porosity of the surface soil usually decreases as the size of the particle increases. The porosity of subsoil is lower than the surface soil due to compaction by gravity.It can be measured by the formulae:
$${\bf{P = 100 - }}\left( {\frac{{{\bf{Bulk}}\,{\bf{Density}}}}{{{\bf{Particle}}\,{\bf{Density}}}}} \right){\bf{ \times 100}}$$
Which one is the most important among Amphibloes
A. Hornblend
B. Tremolite
C. Diopsite
D. Actinolite
Sources of negative charges on silicate clays is/are
A. Exposed crystal edges
B. Isomorphus substitution
C. Anion exchange
D. All of these
The most conspicuous chemical change that take place when soil is flooded is reduction of
A. Fe
B. P
C. S
D. None of these
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