Which chemical used to prevent evaporation from surface of water in water bodies?

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1. Which chemical used to prevent evaporation from surface of water in water bodies?

   A. Cetyle alcohol B. Methyle alcohol C. both A and B D. None of these Submitted by: Shafiq Rehman...

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

   A. Evaptranspiration B. Transpiration C. Evaporation D. Guttation...

3. Any material such as straw, sawdust, leaves, plastic films, & loose soil that is spread upon the surface of the soil to protect the soil & plant roots from the effects of raindrops, soil crusting, freezing or evaporation:

   A. Mull B. Mulch C. Mycorrhizae D. Muck Submitted by: Shafiq Rehman...

4. Which one of the following plants prevent soil erosion and reclaim water logged soils____________________?

   A. Ber B. Guava C. Pome granate D. All the above...

5. Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ________________ surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:

   A. Extremely low B. Extremely high C. Very little D. None of these Submitted by: Shafiq Rehman...

6. The wearing away of the land surface by wind, water, ice or other geological agents is called____________________?

   A. Seepage B. Soil erosion C. Soil contamination D. All the above...

7. Small rivulets or finger like channels formed on the surface of earth by action of water, these channels are of small depth & can be leveled by tillage operations is:

   A. Gully erosion B. Sheet erosio. C. Stream bank erosion D. None of these Submitted by: Shafiq Rehman...

8. The application of science and engineering process to increase shelf life of food and prevent deterioration is known as___________________?

   A. Food processing B. Food science C. Food technology D. Food preservation...

9. To prevent the growth of molds in bread ind other backed food which preservative is used___________________?

   A. Sodium acetate B. Potassium acetate C. Calcium acetate D. All the above...

10. To prevent deterioration of food from microorganisms which one of the following preservatives are used _____________________?

    A. NaCl B. Sulpher dioxide C. Nitrate D. All the above...