Ocean Salinity and the Factors Affecting It

Q.

What is the full form of SPM?

Q. Assertion[A]: The Arabian Sea is much saltier than the neighbouring Bay of Bengal.

Reason[R]: The continuous input of freshwater from moonsoon rains and the Ganga-Brahmaputra river systems makes the Bay of Bengal relatively less saline.

Read the above given statements carefully and select the option that is true.

1. Both A and R are true. R is the incorrect explanation of A.
2. Both A and R are true. R is the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Q.

Salinity is low in the land-locked Baltic Sea. Give reason.

Q. _________ is a line joining the points in the ocean having the same degree of salinity.

1. Isosaline
2. Isohaline
3. Mesosaline
4. Pesosaline

Q. 'X' is a waterbody in Southwest Asia. Its salinity is almost ten times the average salinity of the world's oceans. Except for a few unicellular organisms, 'X' is devoid of any life forms. It is one of the places having the lowest elevations on the Earth. Low rainfall, low supply of freshwater, and high evaporation are the reason for its high salinity. Identify 'X' in the above given question.

1. Red Sea
2. Black Sea
3. Dead Sea
4. Caspian Sea

Q. Which of the following instruments are used to measure salinity?

1. Refractometer
2. Salinometer
3. Anemometer
4. Hydrometer

Q. Which layer of the ocean is most likely to be the densest?

1. Surface water
2. First layer
3. Second layer
4. Third layer

Q. How much salt would 1 kg of Mediterranean sea water yield?

1. 254 g
2. 123 g
3. 73 g
4. 39 g

Q. Which of the following factors affect salinty of ocean water?

1. Season
2. Winds
3. Gravity
4. Ocean currents

Q. Landlocked seas have lower salinity compared to open seas.

1. True
2. False

Q. __________ is a measure of salt contained in grams in a thousand grams or one kg of water.

1. Basicity
2. Alkalinity
3. pH
4. Salinity

Q. Match the following regions to the major factor that affects the ocean salinity in the region.

1. Freshwater from rivers
2. Melting ice caps
3. High evaporation

Q. Why is the northern part of the Red Sea more saline than its southern part?

1. The northern part of the Red Sea recieves water from Gulf of Suez.
2. The rate of evaporation is lower in the northern part of the Red Sea.
3. The nothern part of the Red Sea is a landlocked sea.
4. Salinity and temperature currents of Indian Ocean largely regulate the salinity and temperature of southern end.

Q. Pick the right statements from the following:

1. Equatorial waters are less saline than polar waters.
2. Polar water experience less evaporation.
3. Equatorial waters are supplied less fresh water.
4. Polar ice caps make the water more salty.

Q.

Give three ways in which salt water is different from pure water.

Q. Which line joins the points in the ocean that have the same degrees of salinity?

1. Isobar
2. Isoheight
3. Isoline
4. Isohaline

Q. Which of the following water bodies host freshwater in them?

1. Groundwater
2. Glaciers
3. Rivers
4. Seas

Q. Pick the two regions which have lower ocean salinity compared to others.

1. Polar regions
2. Temperate regions
3. Tropical regions
4. Equatorial regions

Q. Salt in the ocean comes from which of the following sources?

1. Runoff from the land
2. Rain in the sea
3. Openings in the sea floor
4. Ship cargo leakage