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Free download in PDF Soil Science Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
Microorganism involve in conversion from nitrite to nitrate
[A]
Nitrosomonas
[B]
NitrobactorMore
[C]
Pseudomonas
[D]
Bacillus
(2)
Denitrification is a process of ______
[A]
Oxidation
[B]
Reduction
[C]
Hydration
[D]
Carbonation
(3)
Immobilization of sulphur occur in soil when C:S ratio is _____
[A]
< 300:1
[B]
> 300:1
[C]
> 400:1
[D]
> 200:1
(4)
Base saturation in lateritic soil
[A]
< 40 %
[B]
> 40%
[C]
< 20%
[D]
> 20%
(5)
Hydrogen bond found in which clay mineral
[A]
Kaolinite
[B]
Montmorillonite
[C]
Vermiculite
[D]
Beidelite
(6)
Mica is a type of clay mineral
[A]
1:1
[B]
2:1
[C]
2:1:1
[D]
None of the above
(7)
Which plant is used for indication of permanent wilting point?
[A]
Safflower
[B]
Sunflower
[C]
Marigold
[D]
None of the above
(8)
The central cation on silica tetrahedron is _____
[A]
Al3+
[B]
Si4+
[C]
Fe2+
[D]
None of the above
(9)
Soil colloidal particle shows the phenomena
[A]
Plasticity
[B]
Adhesion and cohesion
[C]
Flocculation
[D]
All of the above
(10)
Available water held between
[A]
Saturation to wilting point
[B]
Field capacity to hygroscopic coefficient
[C]
Only field capacity
[D]
Field capacity to wilting point
Answer: Field capacity to wilting point
(11)
pF scale for Field capacity is _____
[A]
2
[B]
2.5
[C]
3.5
[D]
4.5
(12)
In munsell colour chart hue 10 represents as ______
[A]
Red
[B]
Black
[C]
Grey
[D]
Yellow
(13)
Which organic fraction not soluble in both acid and alkali
[A]
Fulvic
[B]
Humic
[C]
Humin
[D]
All the above
(14)
The phenomenon slickenside found in which soil
[A]
Inceptisol
[B]
Vertisol
[C]
Gelisol
[D]
Spodosol
(15)
The conversion factor for calculating P from P2O5
[A]
P2O5 x 2.29
[B]
P x 0.44
[C]
P x 2.29
[D]
P2O5 x 0.44
(16)
Rock phosphate has P2O5
[A]
10-20%
[B]
20-40%
[C]
30-50 %
[D]
20-30%
(17)
Maximum N content found in N fertilizer
[A]
Urea
[B]
Anhydrous ammonia
[C]
Sodium nitrate
[D]
Ammonium sulphate
Answer: Anhydrous ammonia
(18)
Which fertilizer produce acidity in soil?
[A]
Ammonium sulfate
[B]
Sodium nitrate
[C]
Calcium ammonium nitrate
[D]
Calcium nitrate
(19)
Phosphorus uptake in alkali soil in the form of _____
[A]
H2PO4–
[B]
HPO42–
[C]
PO43–
[D]
H3PO4
(20)
Hue denotes
[A]
Dominant spectrum
[B]
Lightness or brightness
[C]
Purity
[D]
Intensity
Answer: Dominant spectrum
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