3151. How much percentage of soils of Pakistan are deficient in P______________________?
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A. 80-90

B. 60

C. 50-70

3152. Biochemical reduction of nitrate to nitrite or gaseous nitrogen is called ________________________?
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A. Reduction

B. None of the above

C. Denitrification

D. Oxidation

3153. The exact chemical formula of DAP fertilizer is___________________?
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A. (NH2) HPO4

B. NH4H2PO4

C. NH4H2PO4

D. Both a & c

3154. The chemical formula of Hematite is_____________________?
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A. AL (OH)2

B. Fe2O3

C. Fe OOH

D. None of the above

3155. Silt stones consists of grains whose size range from____________________?
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A. 0.625 mm

B. 0.004 mm

C. 0.0625 mm

D. Both b & c
3156. Ligands that occur in Pakistan soils are__________________?
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A. CO3-2 SO4-2

B. SO4-2 OH

C. All the above

D. OH1 HCO2

3157. Weathering is_______________________?
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A. Destructive process

B. Constructive process

C. Both a & b

D. None of the above

3158. Schist is example of____________________?
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A. Stone

B. Name of mountain

C. None of the above

D. Metamorphic rock
3159. The EC: SAR and RSC values suggested by WAPDA for 3rd class irrigation water(C,S,R,) are____________________?
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A. ECi:

B. ECi:>1.5, SAR > 10 & RSC> 2.5

C. ECi:>1.5, SAR 2.5

D. Both a & b

3160. Soil structure without aggregation is known as____________________?
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A. Platy

B. Granular

C. Massive

D. Both b & c

3161. Na and k can be determined by the use of____________________?
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A. Hydrometer

B. All the above

C. Flame photometer

D. Spectrophotometer

3162. Which element can be fixed by smecitite___________________?
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A. Mg

B. K

C. NH2

D. Both b & c

3163. Deficiency of B can be corrected through application of chemical fertilizer of_________________?
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A. Borax

B. Boric acid

C. Solubor

D. All the above
3164. A compound toxic to crop formed by the thermal decomposition of urea is_________________?
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A. Uric acid

B. Biurct (NH2CONH CONH2 H2O)

C. Diuret

D. Both b & c

3165. Histols are found in______________________?
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A. Pakistan

B. Canada

C. Alaska

D. Both b & c
3166. DAP fertilizer available in Pakistan contains__________________________?
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A. 100%P2O3

B. 46%N & 18%P2O3

C. 18% N & 46% P2O5

D. 50%P2O3

3167. The chemical formula for Ammonium acctatc is_____________________?
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A. NH3OAC

B. NH4OAC

C. NH4AOC

D. Both b & c

3168. Mean annual precipitation for tundra region is ____________________?
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A. None of the above

B. 150-70 cm

C. 0-50 cm

D. 70-80 cm

3169. An expression of the intensity of the basic or a acidic condition of a liquid or of soil is called_____________________?
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A. ESR

B. pH

C. EC

D. SAR

3170. TSP contains____________________?
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A. 46%P

B. 14%

C. 40%P

D. 50%P

3171. Boron concentration is irrigation water is considered safe only upto_________________?
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A. 0.7 ppm

B. 2 ppm

C. 3 ppm

D. 1.5 ppm

3172. Mollic refers to____________________?
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A. C-horizon

B. U-horizon

C. Surface horizon

D. B-horizon

3173. Permanent change in soil is due to__________________?
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A. pH change

B. Covalent bonding

C. Isomorphic substitution

D. Ionic bonding

3174. The aggregation of individual particles is called___________________?
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A. Granulation

B. Texture

C. Flocculation

D. Structure

3175. Radiation can be detected by the blankening of photographic film or by using___________________?
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A. Ratio autoanalyser

B. GM counter

C. Neutron probe

D. Dosimeter

3176. C12H12N-NaO8S2 is the chemical formula of ____________________?
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A. Carbonated sodium sulphate

B. Azomethine H

C. Activated charcoal

D. None of the above

3177. Rocks which are formed by disintegration of pre-existing rocks by weathering are____________________?
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A. Greis

B. Sand stone

C. Classics

D. Igneous

3178. The water loss through transpiration from vegetative and evaporation from soil surface is known as__________________?
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A. Evaporation

B. Evaptranspiration

C. Guttation

D. Transpiration

3179. Soil particles having diameter greater than 2 mm are called___________________?
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A. Gravel

B. Silt

C. Clay

D. Sand

3180. The time for which water and ion remains in vicinity is called_____________________?
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A. Residence time

B. ppm

C. Primary hydration

D. Normality

3181. The moisture content below which a cohesive soil does stick to metal tools is known as______________________?
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A. Alter berg limit

B. Liquid limit

C. Plastic limit

D. Sticky limit
3182. Igneous rock whose crystal is 1 cm called____________________?
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A. Felsic

B. Mafic

C. Pegmatitic

D. Plutonic

3183. The deficient level of N (%) in plants suggested by various workers is____________________?
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A. 0%

B. 5%

C. 3%

D. 10%

3184. Rocks formed from compacted clay or mud are called____________________?
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A. Clay stone

B. Sand stone

C. None of the above

D. Shale
3185. Part of soil which is in contact with root surface is called___________________?
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A. Lithoshpere

B. Rhizoshpere

C. None of the above

D. Atmoshpere

3186. [(NH4)2SO4FeSO66H2O] is the formula of _______________________?
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A. Ammonium sulphate Iron sulphate

B. None of the above

C. Ferrous Ammonium sulphate

D. Sodium ammonium sulphate

3187. Point of zero change means____________________?
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A. All are ionic bond

B. All the covalent bonds

C. None of the above

D. Zero charge at surface
3188. While diluting acid always add_____________________?
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A. Acid to water

B. Water to acid

C. Both a & b

D. none

3189. Microorganisms have C/N ratio of____________________?
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A. 4:1

B. 12:01

C. 20:01

D. 2:01

3190. Thickness of Dikes ranges from___________________?
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A. Few m 10 m

B. Few cm 10 cm

C. 2-10 m

D. 10-12 cm

3191. Soil moisture and ET losses are_________________?
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A. Occasionally related

B. Inversely related

C. Not related

D. Directly related
3192. The chemical formula of urea fertilizer is_______________________?
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A. NH<sub>2</sub>CONH<sub>2</sub>

B. [CO(NH<sub>2</sub>)]

C. Both a & b

D. None of the above

3193. The exact formula for calculating the base saturation percentage is_____________________?
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A. Bas saturation percentage = CA+Mg+Na / CEC x 100

B. None of the above

C. Bas saturation percentage = /CEC / CA+Mg+Na x 100

D. Bas saturation percentage = /CEC / CA+Mg x 100

3194. Humic acid is soluble in______________________?
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A. Acid

B. Alkali

C. Both a & b

D. Distilled water

3195. Which silica mineral is present in soil in abundant quantity____________________?
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A. Smectite

B. Quartz

C. All the above

D. Gypsum

3196. The factor used for conversion of P to P2O3 is____________________?
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A. o.453

B. None of the above

C. 0.643

D. 0.436
3197. According to WAPDA, the ECe of the salt free soil should remain__________________?
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A. 4-8 dsm-1

B. None of the above

C. < 4 dsm-1

D. Equal to 4 dsm-1

3198. The lower limit of available water is called ____________________?
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A. Field capacity

B. Hygroscopic water

C. Available water

D. Wilting point
3199. Tuff is__________________?
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A. Consolidated ash

B. Soil

C. Water

D. Volcanic ash
3200. The science of growing terrestrial plants in an aerated solution is known as___________________?
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A. Hydrology

B. Nutrient film technique

C. Hydrants

D. Hydroponics