The percentage of water found in oceans is:

Related Mcqs:

1. The temperature of surface water of oceans is about 25C and it is 5?C at the depth of few hundred meters in the:

   A. Temperate region
   B. Tropical region
   C. Torrid region
   D. Equatorial region

2. The greatest biomass of autotrophs in the world’s oceans is that of:

   A. Benthic brown algae, coastal red algae and daphnids
   B. Benthic diatoms and marine viruses
   C. Sea-grasses and slime-molds
   D. Free-floating microalgae, cyanobacteria and nanoplankton

3. The percentage of run off water reaching the ocean and evaporation into atmosphere is respectively:

   A. 27 & 73
   B. 73 & 27
   C. 37 & 63
   D. 63 & 37

4. The percentage of water bound in lithosphere and sedimentary rocks is:

   A. 75
   B. 65
   C. 85
   D. 95

5. Percentage of water left in the soil when a plant wilts is known as:

   A. Turgidity
   B. Wilting coefficient
   C. Field capacity
   D. Water retaining power of the soil

6. BOD value of sewage water than that of tap water is:

   A. More
   B. Less
   C. Equal
   D. Somewhere more somewhere less

7. As compared to tap water the BOD of sewage polluted water shall be:

   A. High
   B. Low
   C. Same
   D. None of these

8. The soils that are fully laden with water i.e., water logged, are known are:

   A. Physically dry soils
   B. Physiologically dry soils
   C. Alkaline soils
   D. Acidic soils

9. When a soil has been thoroughly wetted and then allowed to drain until capillary movement of the water has stopped, the water content of the soil will give an estimate of it’s:

   A. Gravitational water
   B. Capillary water
   C. Field capacity
   D. Storage capacity

10. Water-logging is a serious problems, with water-table within _____ over the greater part of the area:

    A. 5m
    B. 6m
    C. 7m
    D. 8m