Soil Science MCQ – 29

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Q.1: Borax and Ammonium Molybdate having ___% of B and Mo respectively?

1. 15 and 25
2. 12 and 35
3. 20 and 52
4. 10.5 and 52

Q.2: Among these which one is Chromium containing mineral?

1. Zircon
2. Epidote
3. Garnet
4. Sphene

Q.3: Microbial Biomass generally constitute __ % of total soil mass?

1. 0.001-0.01%
2. 0.01-0.4%
3. 0.1-0.4%
4. 1-4%

Q.4: Which mineral having wall-building property, thus used in drilling oil wells?

1. Bentonite
2. Kaolinite
3. Smectite
4. Illite

Q.5: Primary minerals are having diameter?

1. < 2 µm
2. > 2 µm
3. > 0.002 mm
4. both B and C

Q.6: Calcification of soil results in ___ horizon?

1. Bt
2. Bk
3. Bz
4. O

Q.7: During Isomorphous substitution within clay, two cations (replaceable and replacing) must have ionic radii within range of?

1. 0-15%
2. 10-20%
3. 15-25%
4. 20-25%

Q.8: Single Super Phosphate is produced by reacting Rock Phosphate with?

1. H2 SO4
2. H3 PO4
3. HNO3
4. Aqua regia

Q.9: The reason of soil flocculation is?

1. Lowering of Zeta potential
2. Increase in Zeta potential
3. No effect on Zeta potential
4. None of the above

Q.10: Fibrous clay is?

1. Serpentine
2. Dickite
3. Nontronite
4. Attapulgite

Soil Science MCQ – 29

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