1. Which one of the following is a cold ocean current? [UPSC CDS-1 2021]
(a) Brazilian Current
(b) Gulf Stream
(c) North Equatorial Current
(d) California Current
2. Which one of the following is not correct about Sargasso Sea? [UPSC CDS-1 2019]
(a) It is characterized with anticyclonic circulation of ocean currents
(b) It records the highest salinity in Atlantic Ocean
(c) It is located west of Gulf Stream and east of Canary Current
(d) It confined in gyre of calm and motionless water
3. What is a continental shelf?
(a) It is a part of the ocean which is really an extension of the land mass, but submerged
(b) It is that part where the ocean commences
(c) It is a land mass which is surrounded by water on all sides
(d) It is a part of the continent that is submerged in relatively shallow sea
4. Which one among the following ocean currents mixes with Labrador current? [UPSC CAPF 2013]
(a) Canaries current
(b) Benguela current
(c) Florida current
(d) California current
5. High tides at antipodes are caused due to
(a) Gravitational pull of the moon and the sun
(b) Gravitational pull of the sun
(c) Centrifugal, centripetal and gravitational pull of the sun
(d) Centrifugal, centripetal and gravitational pull of the sun and the moon
6. Consider the following statements relating to Sea Salinity.
- The ocean salinity depends on evaporation and precipitation.
- Any change in the temperature or density influences the salinity.
- Major source of sea salinity of terrestrial discharge by rivers.
Which of the statements given above are correct? [UPSC CAPF 2016]
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
7. Which one of the following pairs of Island and Sea/Ocean is NOT correctly matched? [Asked in UPSC CAPF 2017]
(a) Cyprus : Mediterranean Sea
(b) Falkland : Atlantic Ocean
(c) Chagos : North Pacific Ocean
(d) Islas Cocos : Indian Ocean
8. Between India and East Asia, the navigation-time and distance can be greatly reduced by which of the following? [UPSC CSE 2011]
1. Deepening the Malacca straits between Malaysia and Indonesia.
2. Opening a new canal across the Kra isthmus between the Gulf of Siam and Andaman Sea.
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
9. Consider the following statements: [UPSC CSE 2021]
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 following statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
10. Consider the following statements: [UPSC CSE 2021]
1. The Global Ocean Commission grants licences for seabed mining in international waters.
2. India has received licenses for seabed mining mineral exploration in international waters.
3. ‘Rare earth minerals’ are present on seafloor in international waters.
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
11. With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct? [UPSC CSE 2020]
1. OMT is measured up to a depth of 26°C isotherm which is 129 meters in the southwestern 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
12. At one of the places in India, if you stand on the seashore and watch the sea, you will find that the sea water recedes from the shore line a few kilometres and comes back to the shore, twice a day, and you can actually walk on the sea floor when the water recedes. This unique phenomenon is seen at [UPSC CSE 2017]
(a) Bhavnagar
(b) Bheemunipatnam
(c) Chandipur
(d) Nagapattinam
13. Tides occur in the oceans and seas due to which among the following? [UPSC CSE 2015]
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
14. What explains the eastward flow of the equatorial counter-current? [UPSC CSE 2015]
(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
15. The most important fishing grounds of the world are found in the regions where [UPSC CSE 2013]
(a) warm and cold atmospheric currents meet
(b) rivers drain out large amounts of fresh water into the sea
(c) warm and cold oceanic currents meet
(d) continental shelf is undulating
16. Consider the following factors: [UPSC CSE 2012]
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 influence the ocean currents?
(a) 1 and 2 only
(b) 1, 2 and 3
(c) 1 and 4
(d) 2, 3 and 4
17. Tsunami causes devastation near the coast of the sea as the speed of the sonic waves generated at the epicentre is ? [UPSC CAPF 2011]
(a) directly proportional to the depth of the sea
(b) inversely proportional to the depth of the sea
(c) directly proportional to the distance between the coast and epicentre
(d) inversely proportional to the distance between the coast and epicentre
18. Which one among the following is a cold current in the Atlantic Ocean? [UPSC CAPF 2012]
(a) Gulf Stream
(b) Benguela Current
(c) Peru Current
(d) Brazil Current
19. The Mariana Trench is the deepest part of the oceans. Which one among the following statements regarding this is not correct? [UPSC CAPF 2014]
(a) It is located in the Western Pacific Ocean, to the West of Mariana Island
(b) The trench was first sounded during the challenger expedition in 1875
(c) The trench is about 2550 km long and an average width of only 69 km
(d) At the bottom of the trench the water column above exerts a pressure over 1000 times the standard atmospheric pressure at sea level
20. The Sargasso Sea is a vast patch of Atlantic Ocean characterized by an abundance of floating brown seaweed called ‘Sargassum’. This is formed due to the deposit of marine plants and refuse carried by the
1. North Atlantic current
2. Canary current
3. North Atlantic Equatorial current
Select the correct answer using the codes given below. [UPSC CAPF 2014]
(a) Only 1
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3
21. The Kuroshio is a North flowing Ocean current on the West side of the North Pacific Ocean. Which one among the following statements regarding this is ‘not correct? [UPSC CAPF 2014]
(a) It is similar to the, Gulf Stream in the North Atlantic Ocean
(b) It transports warm tropical water Northward towards the Polar region
(c) The warm water of the Kuroshio current sustains the coral reefs of Japan
(d) It begins off the coast of Japan and flows Northward
22. Which of the following statements with regard to the continental shelf is not correct? [UPSC CAPF 2015]
(a) Shelves are absent close to plate boundaries
(b) They are highly sedimented
(c) They have abrupt falls towards the continental slopes
(d) They are rich fishing areas
23. If a place is affected by Tide at 6:00 am Monday, normally at what time the same place will be affected by Ebb? [UPSC CAPF 2016]
(a) 6:26 pm Monday
(b) 6:52 am Tuesday
(c) 12:13 pm Monday
(d) 00:26 am Tuesday
24. The tides whose height is 20 percent more than normal tide are called ? [UPSC CAPF 2018]
(a) spring tides
(b) neap tides
(c) apogean and perigean tides
(d) daily and semi-diurnal tides
25. Which one of the following ocean currents is not a warm current? [UPSC CAPF 2018]
(a) North Pacific
(b) Falkland
(c) North Equatorial
(d) Canary
26. Arabian Sea records higher salinity than the Bay of Bengal because ? [UPSC CAPF 2018]
(a) Arabian Sea exhibits high rate of evaporation and low influx of fresh water
(b) Arabian Sea has shallow water
(c) Arabian Sea has more enclosed land
(d) Arabian Sea receives more rainfall
27. The distance between two successive crests or troughs of sea waves is called as [UPSC CAPF 2020]
(a) Wavelength
(b) Wave height
(c) Wave frequency
(d) Fetch
28. Which of the following factors are needed for the growth of corals? [UPSC CAPF 2021]
1. Freshwater
2. Clear shallow salt water
3. Plenty of sunlight for photo synthesis
4. Warm water between 23 °C and 25 °C
Select the correct answer using the code given below.
(a) 1, 3 and 4 only
(b) 2, 3 and 4 only
(c) 1 and 2 only
(d) 1, 2, 3 and 4
