The safe limit of No2 in drinking water is _______?
A. 10 mg L-1
B. 15 mg L-1
C. 20 mg L-1
D. None of the above
The device used for the measurement of positive pressure potential of soil water is known as ______?
A. Lysimeter
B. Tensiometer
C. Piezometer
D. Barometer
Soil structure without aggregation is known as ______?
A. Platy
B. Granular
C. Massive
D. Both b & c
The water loss through transpiration from vegetative and evaporation from soil surface is known as ______?
A. Evaptranspiration
B. Transpiration
C. Evaporation
D. Guttation
Perfect hardness of any mineral is determined by ________?
A. Mho’s scale
B. pH scale
C. Foot scale
D. None of the above
Primary air pollution is ______?
A. SO
B. SO3
C. SO2
D. None of the above
Algal photosynthesis increases pH of water and releases _______?A. O2
B. CO2
C. SO3
D. All the above
The atmospheric layer lies closest to the earth surface is known as ______?
A. Mesosphere
B. Thermosphere
C. Troposphere
D. Stratosphere
Accumulation of soluble salts root zone is known as _______?
A. Desodication
B. Sodication
C. Degradation
D. Salininzation
Na2CO3 salts is ______?
A. Neutral
B. Alkaline
C. Acidic
D. None of the above
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