agriculture MCQs – Page 64

Practise multiple-choice questions from agriculture for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

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