Agriculture Quiz 43

1. P content in DAP is

A) 20%

B) 36%

C) 46%

D) 50%

2. Chemical formula of single superphosphate is

A) Ca(H2PO4)

B) CaHPO4

C) Ca3(PO4)

D) Ca(H2PO4) CaSO4·2H2O

3. Concentration of nitrogen in soil air is

A) 70%

B) 74%

C) 78%

D) 82%

4. Which of the following is correct?

A) P2O5 × 0.44 = P

B) P2O5 × 2.29 = P

C) P2O5 × 0.83 = P

D) P2O5 × 1.20 = P

5. Sulphur content (%) in potassium sulphate is

A) 50

B) 22

C) 17

D) 12

6. Sodium adsorption ratio (SAR) can be calculated by using the formula

A) SAR = Na⁺ / Ca²⁺

B) SAR = Na⁺ / Mg²⁺

C) SAR = Ca²⁺ + Mg²⁺ / Na⁺

D) SAR = Na⁺ / √[(Ca²⁺ + Mg²⁺)/2]

7. The exchangeable sodium ratio (ESR) can be calculated as

A) ESR = (Ca²⁺ + Mg²⁺) / Na⁺

B) ESR = Exchangeable Na⁺ /

C) ESR = Exchangeable Na⁺ / (Ca²⁺ + K⁺)

D) ESR = Exchangeable Na⁺ / (Ca²⁺ + Mg²⁺)

8. Which one of the following is not correctly matched?

A) Entisols – Recent

B) Aridisols – Arid

C) Histosols – Organic

D) Vertisols – Pedalfer

9. A clay solid must contain at least ____ clay separate to be designated a clay

A) 70%

B) 80%

C) 40%

D) 35%

10. Select the wrong pair from the following

A) Strengite – FePO4·2H2O

B) Variscite – AlPO4·2H2O

C) Gibbsite – Al2O3·3H2O

D) Hematite – FeOOH

11. Boron content in borax (suhaga) is

A) 11%

B) 25%

C) 19%

D) 39%

12. The rate of weathering is generally high in

A) Arid tropical climate

B) Arid temperate climate

C) Humid tropical climate

D) Humid temperate climate

13. Which one of the following pair is mismatched?

A) L value – Larsen

B) Integrated soil test approach – Colwell

C) Biogas – Desai

D) Law of limiting factor – Lundegardh

14. Tick out the incorrect match

A) Dolomite – CaCO3·MgCO3

B) Gibbsite – Al2O3·3H2O

C) Gypsum – CaSO4·2H2O

D) Geothite – Fe2O3

15. The main constituent of biogas is

A) H2

B) H2S

C) N2

D) CH4

16. Nalgonda technique is used for

A) Chloride

B) Fluoride

C) Bromide

D) Cadmium

17. How many agro-climatic zones are found in India?

A) 15

B) 16

C) 17

D) 18

18. Which enzyme is involved in primary carboxylation in C4 plants?

A) RuBP carboxylase

B) PEP carboxylase

C) Oxygenase

D) Carboxylase

19. The pH of normal rain is

A) 6.5

B) 5.6

C) 4.6

D) 3.6

20. Which harmful gas is emitted by masonry building materials and even groundwater?

A) H2S

B) Radon

C) Ammonia

D) CO2

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