Oceans of World – Old Year Questions

The Ocean Currents

1. 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 the ocean currents?

(a) 1 and 2
(b) 1, 2 and 3
(c) 1 and 4
(d) 2, 3 and 4

[I.A.S. (Pre) 2012]


2. 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

[I.A.S. (Pre) 2002]


3. Which one of the following factors is responsible for the change in the regular direction of the ocean currents in the Indian Ocean?

(a) The Indian Ocean is half an Ocean
(b) The Indian Ocean has Monsoon drift
(c) The Indian Ocean is a land-locked ocean
(d) The Indian Ocean has greater variation in salinity

[I.A.S. (Pre) 1997]


4. Agulhas current flows in –

(a) The Indian Ocean
(b) The Pacific Ocean
(c) North Atlantic Ocean
(d) South Atlantic Ocean

[R.A.S./R.T.S. (Pre) 1999]


5. Which of the following is not a cold ocean current?

(a) Canaries
(b) Humboldt
(c) Oyashio
(d) Agulhas

[U.P.P.C.S. (Pre) 2017]


6. Which of the following ocean currents is associated with the Indian Ocean?

(a) Florida current
(b) Canary current
(c) Agulhas current
(d) Kurile current

[U.P. P.C.S. (Pre) 2020]


7. Which of the following is a warm current?

(a) Falkland Current
(b) Brazil Current
(c) Labrador Current
(d) Canary Current

[U.P. R.O./A.R.O. (Mains) 2017]


8. The country benefiting the most from the North Atlantic Drift is :

(a) Poland
(b) Portugal
(c) Norway
(d) Nigeria

[R.A.S./R.T.S.(Pre) 1999]


9. Which one of the following is a cold current of the South Atlantic Ocean?

(a) Canary current
(b) Benguela current
(c) Agulhas current
(d) Brazil current

[U.P.P.C.S. (Pre) 2005]


10. Which one of the following Oceanic currents is not associated with the Pacific Ocean?

(a) Canaries
(b) Kuroshio
(c) California
(d) Humboldt

[Uttarakhand P.C.S. (Pre) 2016]


11. Which of the following ocean currents does not belong to the Indian Ocean?

(a) Agulhas Current
(b) Mozambique Current
(c) South Indian Ocean Current
(d) Benguela Current

[U.P.P.C.S. (Mains) 2014]


12. Which one of the following currents does not contribute to forming a complete circle of currents in the South Atlantic Ocean:

(a) Benguela
(b) Brazil
(c) Canary
(d) West wind drift

[U.P.P.C.S. (Pre) 2000]


13. The ocean current differences from the remaining three are:

(a) Banguela
(b) Brazilian
(c) South Equatorial
(d) Peruvian

[R.A.S./R.T.S.(Pre) 1999]


14. Which of the following is a cold ocean current :

(a) Peruvian Current (Humboldt Current)
(b) Kuroshio Current
(c) Gulf Stream
(d) Brazil Current

[Jharkhand P.C.S. (Pre) 2003, U.P.P.C.S. (Pre) 1995]


15. Which of the following is not matched correctly?

(a) Brazil Current – South Atlantic Ocean
(b) Humboldt Current – North Pacific Ocean
(c) Gulf Stream – North Atlantic Ocean
(d) Agulhas Current – Indian Ocean

[U.P. P.C.S. (Pre) 1998]


16. Gulf Stream is –

(a) a river in the Gulf
(b) an oceanic current
(c) another name of Jet Stream
(d) a surface wind

[44th B.P.S.C. (Pre) 2000, 42nd B.P.S.C. (Pre) 1997]


17. Match List-I with List-II and select the correct answer using the code given below the Lists :
List-I                                                     List-II
A. Gulf Stream                                 1. Pacific Ocean
B. West Wind Drift                        2. A slow eastward movement of water over the zone of westerly wind
C. Peru Current                               3. Indian Ocean
D. West Australian Current       4. Warm current
Code :

(a) 4 2 1 3
(b) 1 3 4 2
(c) 4 3 1 2
(d) 1 2 4 3

[Jharkhand P.C.S. (Pre) 2013]


18. 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

[I.A.S. (Pre) 2015]

Salinity of the Ocean

1. Which one of the following denotes water salinity gradient?

(a) Thermocline
(b) Halocline
(c) Pycnocline
(d) Chemocline

[U.P.P.C.S. (Pre) (Re-Exam) 2015]


2. Main Source of Salinity of the Sea is –

(a) Rivers
(b) Land
(c) Wind
(d) Ash ejected from the Volcano

[53rd to 55th B.P.S.C. (Pre) 2011]


3. Which one of the following salts contributes maximum to the salinity of sea water :

(a) Calcium sulphate
(b) Magnesium chloride
(c) Magnesium sulphate
(d) Sodium chloride

[U.P.P.C.S. (Pre) 2000]


4. The highest salinity is found in :

(a) Dead sea
(b) Red sea
(c) Great Salt Lake in the U.S.A.
(d) Lake Van in Turkey

[U.P.P.C.S. (Pre) 1995]


5. The highest amount of salinity is found in –

(a) Pacific Ocean
(b) Indian Ocean
(c) Mediterranean Sea
(d) Dead Sea

[M.P.P.C.S. (Pre) 2015, Uttarakhand P.C.S. (Mains) 2006]


6. World’s most saline Ocean/Lake is –

(a) Caspian Sea
(b) Great Salt Lake
(c) Dead Sea
(d) Lake Van

[R.A.S./R.T.S. (Pre) 1997]


7. Which of the following seas has the highest salinity?

(a) Caspian Sea
(b) Mediterranean Sea
(c) Red Sea
(d) Dead Sea

[U.P.P.C.S.(Pre) 2012]


8. Which of the following seas has the highest average salinity?

(a) Black Sea
(b) Yellow Sea
(c) Mediterranean Sea
(d) Dead Sea
(e) None of the above/More than one of the above

[60th to 62nd B.P.S.C. (Pre) 2016]


9. When the density in the sea increases, then –

(a) Salinity and depth decreases
(b) Salinity increases but depth decreases
(c) Both salinity and depth increases
(d) Salinity decreases and depth increases

[U.P. P.C.S. (Pre) 1990]


10. Where is the Great Salt Lake located?

(a) Iran
(b) U.S.A.
(c) India
(d) Turkey

[Uttarakhand U.D.A./L.D.A. (Mains) 2006, 2007]


11. The average salinity of water of Arabian Sea is-

(a) 25 ppt
(b) 35 ppt
(c) 45 ppt
(d) 55 ppt

[53rd to 55th B.P.S.C. (Pre) 2011]

High Tide, Low Tide

1. What are the causes of high-tide low tide formation in the oceans ?

(a) Due to the effect of the sun
(b) Due to the rotation of the Earth
(c) Due to the combined effect of sun and the moon
(d) Due to Gravitation, Centripetal force and the centrifugal force

[U.P.P.C.S. (Pre) 1991]


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

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

[I.A.S. (Pre) 2015]


3. The cause of producing indirect high tide is –

(a) Gravitational force of the Moon
(b) Gravitational force of the Sun
(c) Centrifugal force of the Earth
(d) Gravitational force of the Earth

[R.A.S./R.T.S. (Pre) 1999]


4. Statement (A): During the times of neap tide, hightide is below normal and low-tide is above normal.
Reason (R): Neap tide occurs during the new moon instead of full-Moon.
Choose the correct answer using following options –

(a) (A) and (R) both are correct, and (R) is correct explanation of (A)
(b) (A) and (R) both are correct, and (R) is not correct explanation of (A)
(c) (A) is correct, but (R) is wrong
(d) (A) is wrong, but (R) is correct

[I.A.S. (Pre) 1998]


5. Spring Tide occurs :

(a) When the Sun the Earth and Moon are in a straight line
(b) When the Sun and Moon make a right angle
(c) When a strong wind blows
(d) When the night is very cold

[U.P.P.C.S. (Pre) 1999]


6. The high tide in the Ocean is caused by

(a) Earthquake
(b) Sun
(c) Stars
(d) Moon

[47th B.P.S.C. (Pre) 2005]

The Oceanic Trenches

1. Match List I with List II and select the correct answer using the code given below in the lists.
List- I                                      List- II
(Oceanic Trench)            (Location)
A. Aleutian                        1. Indian Ocean
B. Kermadec                    2. North Pacific
C. Sunda                            3. South pacific
D. S. Sandwich                4. South Atlantic Ocean
Code :

(a) 2 4 1 3
(b) 2 3 1 4
(c) 1 3 2 4
(d) 1 4 2 3

[I.A.S. (Pre) 2000]


2. Match List-I with List-II and select the correct answer from the codes given below :
List-I                                         List-II
(Ocean)                                  (Deepest Point)
A. Pacific Ocean                  1. Java Trench
B. Atlantic Ocean               2. Eurasian Basin
C. Indian Ocean                  3. Mariana Trench
D. Arctic Ocean                   4. Puerto Rico Trench
Code :

(a) 4 3 2 1
(b) 3 4 1 2
(c) 1 3 4 2
(d) 2 4 3 1

[U.P. P.C.S. (Mains) 2017]


3. Which is the world’s deepest trench?

(a) Northern
(b) Challenger
(c) Manhattan
(d) Richards

[U.P.P.C.S. (Pre) 1991]


4. Which one of the following is the deepest oceanic trench?

(a) Tonga
(b) Mariana
(c) Puerto Rico
(d) Izu-Bonin

[U.P.P.C.S. (Mains) 2015]


5. In which one of the following oceans Diamantina Trench is situated?

(a) Pacific Ocean
(b) Atlantic Ocean
(c) Indian Ocean
(d) Arctic Ocean

[I.A.S. (Pre) 2006]