Q . OCEANOGRAPHY

With reference to "Coriolis force", which of the following statements is/are correct? 1. It increases with increase in wind velocity. 2. It is maximum at the poles and is absent at the equator. Select the answer using the code given below:

a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2
Answer: c
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  • Statement 1 is correct: Coriolis force increases with an increase in wind velocity. The Earth's rotation around its axis influences the wind's direction through a force known as the Coriolis force. This force causes the wind to be deflected to the right in the northern hemisphere and to the left in the southern hemisphere, with greater deflection occurring at higher wind velocities.
  • Statement 2 is correct: The Coriolis force is proportional to the latitude angle, being strongest at the poles and absent at the equator.
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Q . OCEANOGRAPHY

Which of the following is/are correct inference/inferences from isothermal maps in the month of January? 1. The isotherms deviate to the north over the ocean and to the south over the continent. 2. The presence of cold ocean currents, Gulf Stream and North Atlantic Drift make the North Atlantic Ocean colder and the isotherms bend towards the north. Select the answer using the code given below:

a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2
Answer: a
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  • Statement 1 is correct: The isotherms deviate to the north over the ocean and to the south over the continent.
  •   In the northern hemisphere, the land area is significantly larger than in the southern hemisphere, making the effects of land masses and ocean currents more distinct. In January, isotherms bend northward over the oceans and southward over the continents, as seen in the North Atlantic.
  • Statement 2 is incorrect: Warm ocean currents, such as the Gulf Stream and North Atlantic Drift, make the North Atlantic Ocean warmer, causing isotherms to shift northward. On land, temperatures drop sharply, leading isotherms to bend southward in Europe.
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Q . OCEANOGRAPHY

With reference to the United Nations Convention on the Law of Sea, consider the following statements: 1. A coastal state has the right to establish the breadth of its territorial sea up to a limit not exceeding 12 nautical miles, measured from a baseline determined in accordance with the convention. 2. Ships of all states, whether coastal or landlocked, enjoy the right of innocent passage through the territorial sea. 3. The Exclusive Economic Zone shall not extend beyond 200 nautical miles from the baseline from which the breadth of the territorial sea is measured. Which of the statements given above are correct?

a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3
Answer: d
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Q . OCEANOGRAPHY

Consider the following statements: 1. In the tropical zone, the western sections of the oceans are warmer than the eastern sections owing to the influence of trade winds. 2. In the temperate zone, westerlies make the eastern sections of oceans warmer than the western sections. Which of the statements given above is/are correct?

a) 1 Only
b) 2 Only
c) Both 1 and 2
d) Neither 1 nor 2
Answer: c
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Q . OCEANOGRAPHY

With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct? 1. OMT is measured up to a depth of 26°C isotherm which is 129 meters in the south-western Indian Ocean during January – March. 2. OMT collected during January -March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean. Select the correct answer using the code given below:

a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2
Answer: b
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Q . OCEANOGRAPHY

Consider the following statements: 1. Most of the world’s coral reefs are in tropical waters. 2. More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and the Philippines. 3. Coral reefs host far more animal phyla than those hosted by tropical rainforests. Which of the statements given above is/are correct?

a) 1 and 2 only
b) 3 only
c) 1 and 3 only
d) 1, 2 and 3
Answer: d
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Q . OCEANOGRAPHY

What explains the eastward flow of the equatorial counter-current?

a) The Earth’s rotation on its axis
b) Convergence of the two equatorial currents
c) Difference in salinity of water
d) Occurrence of the belt of calm near the equator
Answer: b
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Q . OCEANOGRAPHY

Tides occur in the oceans and seas due to which among the following? 1. Gravitational force of the Sun 2. Gravitational force of the Moon 3. Centrifugal force of the Earth Select the correct answer using the code given below.

a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3
Answer: d
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Q . OCEANOGRAPHY

The most important fishing grounds of the world are found in the regions where

a) Warm and cold atmospheric currents meet
b) Rivers drain out large amounts of freshwater into the sea
c) Warm and cold oceanic currents meet
d) Continental shelf is undulating
Answer: c
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Q . OCEANOGRAPHY

Consider the following factors: 1. Rotation of the Earth 2. Air pressure and wind 3. Density of ocean water 4. Revolution of the Earth Which of the above factors influences ocean currents?

a) 1 and 2 only
b) 1, 2 and 3
c) 1 and 4
d) 2, 3 and 4
Answer: b
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Q . OCEANOGRAPHY

The acidification of oceans is increasing. Why is this phenomenon a cause of concern? 1. The growth and survival of calcareous phytoplankton will be adversely affected. 2. The growth and survival of coral reefs will be adversely affected. 3. The survival of some animals that have phytoplanktonic larvae will be adversely affected. 4. The cloud seeding and formation of clouds will be adversely affected. Which of the statements given above is/are correct?

a) 1, 2 and 3 only
b) 2 only
c) 1 and 3 only
d) 1, 2, 3 and 4
Answer: d
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Q . OCEANOGRAPHY

In the context of ecosystem productivity, marine dwelling zones are important as they increase the marine productivity by bringing the 1. decomposer microorganisms to the surface. 2. nutrients to the surface. 3. bottom-dwelling organisms to the surface. Which of the statements given above is/are correct?

a) 1 and 2
b) 2 only
c) 2 and 3
d) 3 only
Answer: b
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Q . OCEANOGRAPHY

The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?

a) The mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live nor venture out
b) The mangroves provide both food and medicines which people are in need of after any natural disaster
c) The mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or tsunami
d) The mangrove trees do not get uprooted by storms and tides because of their extensive roots
Answer: d
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Q . OCEANOGRAPHY

Consider the following statements: 1. The annual range of temperature is greater in the Pacific Ocean than that in the Atlantic Ocean. 2. The annual range of temperature is greater in the Northern Hemisphere than that in the Southern Hemisphere. Which of the statements given above is/are correct?

a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2
Answer: b
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Q . OCEANOGRAPHY

The largest coral reef in the world is found near the coast of which one of the following countries?

a) Australia
b) Cuba
c) Ghana
d) Philippines
Answer: a
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Q . OCEANOGRAPHY

Which one of the following statements is not correct?

a) Gulf with narrow fronts and wider rears experience high tides.
b) Tidal currents take place when a gulf is connected with the open sea by a narrow channel.
c) Tidal bore occurs when a tide enters the narrow and shallow estuary of a river.
d) The tidal nature of the mouth of the river Hooghly is of crucial importance to Kolkata as port.
Answer: d
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Q . OCEANOGRAPHY

A: The weight of a body decreases with the increase of latitude on earth. R: The earth is not a perfect sphere.

a) Both A and R are individually true and R is the correct explanation of A
b) Both A and R are individually true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: b
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Q . OCEANOGRAPHY

Consider the following statements: 1. Ocean currents are the slow-surface movement of water in the ocean 2. Ocean currents assist in maintaining the Earth's heat balance 3. Ocean currents are set in motion primarily by prevailing winds 4. Ocean currents are affected by the configuration of the ocean. Which of these statements are correct?

a) 1 and 2
b) 2, 3 and 4
c) 1, 3 and 4
d) 1, 2, 3 and 4
Answer: d
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Q . OCEANOGRAPHY

A: During the Neap Tides, the high tide is lower and the low tide is higher than usual. R: The Neap Tide, unlike the Spring Tide, occurs on the New Moon instead of on the Full Moon.

a) Both A and R are individually true and R is the correct explanation of A
b) Both A and R are individually true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: c
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Q . OCEANOGRAPHY

Consider the following statements: 1. Tides are of great help in navigation and fishing. 2. High tide enables big ships to enter or leave the harbor safely. 3. Tide prevents siltation in the harbors. 4. Kandla and Diamond Harbor are tidal ports. Which of these statements are correct?

a) 1 and 4
b) 2, 3 and 4
c) 1, 2 and 3
d) 1, 2, 3 and 4
Answer: d
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Q . OCEANOGRAPHY

At which one of the following positions shown in the diagram will the height of the ocean tide be maximum?

a) M1
b) M2
c) M3
d) M4
Answer: d
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Q . OCEANOGRAPHY

Which one of the following factors is responsible for the change in the regular direction of the ocean currents in the Indian Ocean?
a) Indian Ocean is half an ocean
b) Indian Ocean has monsoon drift
c) Indian Ocean is a land-locked ocean
d) Indian Ocean has greater variation in salinity
Answer: b
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  •   Indian Ocean has monsoon drift which is responsible for the change in the regular direction of the ocean currents in the Indian Ocean. Ocean currents in the Indian Ocean change their direction twice a year.
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Q . OCEANOGRAPHY

Consider the map given below:
 1. The division along India's coastal region indicates:
a) coastal pollution zones
b) salinity density isopleths
c) the areas upto which Indian sovereignty extends
d) underwater relief contours
Answer: d
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  •   The given map indicates the coastal region underwater relief contours of India. In this region some islands like Andaman, Nicobar and Lakshadweep are present.

o  Oman basin

o  Arabian basin

o  Chapo Ridge

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Q . OCEANOGRAPHY

Neap tides are produced in the first and third quarters of the Moon. Then,

a) The Moon and the Sun are in conjunction with the other planets
b) The Moon and the Sun are in opposition with each other
c) The attractions of the Sun and the Moon are at right angles to each other
d) The Moon and the Sun are in quadrant position to each other
Answer: c
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Q . OCEANOGRAPHY

1. The continental shelf surrounding the Indian Coast is widest off the

a) Hooghly Coast
b) Coromandel Coast
c) Konkan Coast
d) South Gujarat Coast
Answer: c
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  •   The Konkan coast extends along the coasts of Indian states like Maharashtra, Goa and Karnataka for nearly 450 miles. The West Continental shelf is widest (350 km) off the coast of Bombay where the oil-rich Bombay High is located.
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Q . OCEANOGRAPHY

Which of the following is cold ocean current?

a) Labrador
b) Gulf Stream
c) Kuro Shio
d) None of these
Answer: a
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Q . OCEANOGRAPHY

Mean Sea Level (MSL) is the

a) Average level of the sea
b) Height of water above ground level
c) Average height of waves
d) None of the above
Answer: a
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Q . OCEANOGRAPHY

Match the columns:
 1. (A) South-eastern coast of U.S.A.
     (1) Florida current
 2. (B) West coast of South Africa
     (2) Kuroshio current
 3. (C) South-western coast of South America
     (3) Beneguella current
 4. (D) South-eastern coast of Japan
     (4) Peruvian current
 A B C D
a) 2 3 4 1
b) 1 3 4 2
c) 1 4 3 2
d) 2 4 3 1
Answer: b
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  •   The Florida Current is a warm ocean current that flows from the Straits of Florida around the Florida Peninsula and along the southeastern coast of the United States before joining the Gulf Stream.
  •   The Kuroshio Current, also known as the Black or Japan Current or Black Stream, is a warm, north-flowing ocean current on the west side of the North Pacific Ocean basin. It got its name from the deep blue colour of its waters.
  •   The Benguela Current is a cold, wide current that flows northwards along the west coast of southern Africa.
  •   The Humboldt Current, also called the Peru Current, is a cold, low-salinity ocean current that flows north along the western coast of South America.
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