Geography · Environmental Studies

Oceanography and Hydrology

1,673 Questions

Find relevant questions on oceanography and hydrology that address aquatic ecosystems and physical geography. The topics include coastal landforms, coral reefs, ocean salinity, and tidal patterns. These concepts frequently appear in civil services and state level administrative examinations.

Coral reef structuresCoastal landformsOcean salinity patternsGlacial retreat impactsMangrove ecosystems

Oceanography and Hydrology Questions

Multiple choice zoology ecosystem : structure and function biogeochemical cycles - sedimentary biogeochemical cycle nitrogen and phosphorus cycles

A long term global cycle which is linked by water and in
which sea floor rising play an important role is

  1. Water cycle

  2. Carbon cycle

  3. Phosphorus cycle

  4. Carbon and nitrogen cycle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The phosphorus cycle is a long-term sedimentary cycle. Geological processes, such as tectonic uplift, move phosphorus from the sea floor back to land surfaces over geological timescales.

Multiple choice evs mud and stones soil - formation and profile soil-nature soil profile

Source of maximum sulphur is

  1. Ocean

  2. Land

  3. Rocks

  4. Lakes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sulphur is widely distributed as native deposits near volcanoes and hot springs, is a component of sulphide minerals. E.g., galena, pyrite, sphalerite, etc., and is also found in meteorites. Significant deposits exist in salt domes along the Gulf coast of the USA, and in large evaporite deposits in eastern Europe and western Asia, and are most likely the result of bacterial breakdown of sulphate minerals. The weathering of rocks will result in the production of major source of sulphur.

Multiple choice botany ecological adaptations, succession and ecological services ecosystem services ecosystems ecosystem

Mid latitude lakes undergo mixing more than equatorial lakes, select the correct reason.

  1. The midlatitude lakes turn over twice a year

  2. Midlatitude lakes develop a thermocline
  3. Water is densest at $4$

  4. All of the above

  5. They don't - equatorial lakes have more mixing
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Deep lakes at mid-latitudes have well-pronounced stratification which leads to the lakes experiencing wealthy internal waves dynamics. These lakes also possess seasonal water mixing during the spring and autumn transitional periods. This is due to the non-linear thermal expansion of water when its temperature reaches 4$^0$C and the density of water is maximum.  Further, with the increasing latitudes support the general cyclonic water circulation. Hence the large lakes along mid-latitudes show a large variety of these physical processes.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Evaporation of water will be faster:

  1. near the sea

  2. far away from the sea

  3. both at equal rates

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Increase in humidity, reduces the rate of evaporation. The area near sea will be more humid as compared to the area far away from the sea. Hence, evaporation will be faster far away from the sea.

Multiple choice geography rivers, coasts and glaciation river landform landforms created by wind erosion wind and coast

The steep rocky coast rising almost vertically above sea water is called ________________.

  1. Sea waves

  2. Sea arches

  3. Stacks

  4. Sea cliff
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Sea-waves continuously strike at the rocks. Cracks develop. Over time they become larger and wider. Thus, hollow like caves are formed on the rocks. They are called sea caves.
  •  As these cavities become bigger and bigger only the roof of the caves remains, thus forming sea arches.
  •  Further, erosion breaks the roof and only walls are left. These wall-like features are called stacks.
  • The steep rocky coast rising almost vertically above seawater is called sea cliff. 

Multiple choice geography rivers river landform landforms created by wind erosion wind and coast

Deltas are formed where the shores are free of ________.

  1. trees

  2. hard rocks

  3. high tide

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Deltas are formed where the shores are free of hard rocks. 
When a river reaches a lake or the sea the water slows down and loses the power to carry sediment . The sediment is dropped at the mouth of the river. Some rivers drop so much sediment that waves and tides can't carry it all away. It builds up in layers forming a delta.
Multiple choice geography rivers river landform landforms created by wind erosion wind and coast

Which of the following is not conducive to the formation of deltas?

  1. Currents and Tides

  2. Calm winds

  3. Absence of large lakes along the course of the river

  4. Sheltered coastline
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Currents and Tides is not conducive to the formation of deltas. When a river reaches a lake or the sea the water slows down and loses the power to carry sediment . The sediment is dropped at the mouth of the river. Some rivers drop so much sediment that waves and tides can't carry it all away. It builds up in layers forming a delta.

Multiple choice geography water bodies study of water pollution threats to water resource pollution and environment

Salinity of Black sea is _____.

  1. 17%

  2. 18%

  3. 19%

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The upper flow leaves the Black Sea and carries surface water out of it. Meanwhile a bottom flow carries salt water, about 35‰ from the Mediterranean to the Black Sea. The salty water mixes with the waters of the basin proper and that results in a comparatively low salinity at the surface, about 17%.

Multiple choice geography water bodies study of water pollution threats to water resource pollution and environment

The lines which join the points of same salinity in ocean are called ____________.

  1. Isobars

  2. Isohytes

  3. Isohalines

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The prefix 'iso' is a greek word meaning equal, so an isoline must be a line joining equal points. For example, a line drawn on a map to join up all the places that are the same height above sea level is called a contour.

Multiple choice general knowledge resources of india and world animal husbandry and fishery green and white revolution agriculture in indian economy

Consider the following statements:
(1) Most of the fishing grounds occur in areas where the continental shelf is wide.
(2) Fishing activity is well developed in warm tropical waters.
(3) Mixing of warm and cold currents bring plant nutrients for fish.
(4) Inland fisheries are more significant than other types in India.
Which of the statements given above is/are correct?

  1. 1 and 4

  2. 1 and 3

  3. 2, 3 and 4

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fishing grounds are rich where the continental shelf is wide (1) and where warm and cold currents mix (3), as this promotes plankton growth. Statement 2 is incorrect because cold waters are generally more productive than warm tropical waters. Statement 4 is incorrect as marine fisheries are more significant than inland fisheries in India.

Multiple choice general knowledge resources of india and world animal husbandry and fishery green and white revolution agriculture in indian economy

The reasons for underdevelopment of fishing industry in tropics are:
(1) Tropical fish are oily and less popular as food.
(2) Continental shelves are almost absent.
(3) the different species are usually mixed and shoals of same species are rare.
(4) the tropical fishing industry is less mechanised.
Select the correct answer using the codes given below:

  1. 1, 2 and 3

  2. 1, 2 and 4

  3. 1, 3 and 4

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tropical fishing is hindered by the lack of broad continental shelves, the mixing of many species (making large-scale netting of a single species difficult), and lower levels of mechanization. Tropical fish are not inherently oily or less popular; in fact, many are highly prized.