51.

The salinity of sea ice ranges from :

• 0-3%

• 3-10%

• 11-17%

• 28-35%

The basaltic ocean crust has an average density of :

• 2.65 g/cm³

• 2.75 g/cm³

• 2.9 g/cm³

• 3.0 g/cm³

The average depthb of "equatorial-counter" current is :

• 50 m 

• 100 m

• 150 m

• 200 m

The Gulf Stream and the Kuroshio current move forcefully northward as a result of :

• Western intensification

• Eastern intensification

• Northern intensification

• Southern intensification

Which of the following is a cold current ?

• Brazil current1

• Gulf Stream 

• Benguela current

• Agualhas currrent

The vertical movement of cold water from deeper oceanic layers to replace warmer surface water is called as 

• Turbidity

• Emergence

• Upwelling

• Halocline

Which one of the following types of sea floor sediments includes calcareous and siliceous oozes ?

• Fluvial

•  Terrigenous

• Biogenous

• Hydrogenous

ASSERTION (A) : Oceanic salinity is low in the equatorial region.

REASON (R) : Equatorial region is characterized by heavy rainfall, cloudiness and humidity.

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true , but (R) is false.

• (A) is false , but (R) is true.

Salinity in water bodies increases with :

• increase in evaporation and decrease in admixture of fresh water.

• decrease in evaporation and increase in admixture of fresh water.

• decrease in evaporation and no change in admixture of fresh water.

• increase in evaporation and increase in admixture of fresh water.

ASSERTION (A) : The salinity in Dead sea is very low.

REASON (R) : Dead Sea is located in tropical dry climatic regions , where evaporation is high , precipitation is low and here drainage is internal.

• Bothb (A) and (R) are right.

• Both (A) and (R) are wrong.

• (A) is wrong , but (R) is right.

• (A) is right , (R) is wrong.