Q60. The Palk Strait forms part of which ocean’s waters?
[MP Police Constable, 26 August 2023]
(A) Pacific Ocean
(B) Atlantic Ocean
(C) Arctic Ocean
(D) Indian Ocean
Answer: (D) Indian Ocean
Explanation: The Palk Strait lies between southeastern India and northern Sri Lanka, connecting the Bay of Bengal region with the Palk Bay area. Both form part of the Indian Ocean system, significant for navigation, coastal ecology and fisheries.
Q59. Huge sea waves generated by undersea earthquakes or volcanic eruptions are called what?
[MP Forest Guard, 3 June 2023]
(A) Tsunamis
(B) Tropical cyclones
(C) Landslides
(D) Oceanic tides
Answer: (A) Tsunamis
Explanation: Tsunamis are long-wavelength waves caused mainly by sudden displacement of water during undersea earthquakes, landslides or volcanic events. Near coasts, the waves can grow destructive and threaten ports, fishing settlements and coastal ecosystems.
Q58. In which type of ocean-water movement do water particles describe small, approximately circular paths?
[KVS PGT Geography, 18 February 2023]
(A) Tides
(B) Currents
(C) Surges
(D) Waves
Answer: (D) Waves
Explanation: In many surface waves, water particles move in nearly circular orbits while wave energy travels across the sea. Tides involve broad periodic sea-level changes, whereas currents transport seawater along sustained pathways. These motions affect coastal conditions differently.
Q57. Which narrow marine passage separates India and Sri Lanka?
[SSC MTS, 12 September 2023]
(A) Strait of Gibraltar
(B) Dardanelles
(C) Bosphorus
(D) Palk Strait
Answer: (D) Palk Strait
Explanation: The Palk Strait lies between Tamil Nadu and northern Sri Lanka. Its shallow waters and nearby island chains influence navigation and fishing. The broader Gulf of Mannar region supports rich marine habitats, including coral reefs and seagrasses.
Q56. Continuous, directed movements of seawater across the ocean surface are called what?
[SSC MTS, 11 May 2023]
(A) Waves
(B) Cyclones
(C) Tides
(D) Ocean currents
Answer: (D) Ocean currents
Explanation: Ocean currents are persistent flows of seawater influenced by winds, density differences and Earth’s rotation. Unlike waves or tides, currents transport water over long distances, redistributing heat, nutrients and marine organisms that affect fishing grounds.
Q55. Consider statements:
A. All oceans are connected.
B. Oceans are active only during new and full moons.
C. Waves, tides and currents are principal forms of seawater movement.
D. The Atlantic is the largest ocean.
Which combination is correct?
[KVS Primary Teacher, 21 February 2023]
(A) A and B
(B) B and C
(C) A and C
(D) A, B and D
Answer: (C) A and C
Explanation: The global ocean forms an interconnected body of water, and seawater continually moves through waves, tides and currents. Ocean activity is not restricted to lunar phases. The Pacific, rather than the Atlantic, is Earth’s largest ocean.
Q54. What is the tidal lower course of a river, where freshwater meets seawater, called?
[MP Police Constable, 14 August 2023]
(A) Gulf
(B) Estuary
(C) Delta
(D) Pocket beach
Answer: (B) Estuary
Explanation: An estuary is a coastal inlet where river freshwater mixes with tidal seawater. Such brackish environments can be highly productive and support fish nurseries, shellfish and mangroves. They are also sensitive to pollution and land reclamation.
Q53. When the Sun, Moon and Earth are roughly in line, which kind of tide generally occurs?
[Delhi Police Constable, 1 December 2023]
(A) Spring tide
(B) Autumn tide
(C) Neap tide
(D) Diurnal tide
Answer: (A) Spring tide
Explanation: Spring tides occur near new and full moons when lunar and solar tidal forces reinforce one another. They produce a greater tidal range, affecting estuaries, coastal navigation, sediment transport and access to intertidal fishing grounds.
Q52. What is an atoll?
[SSC Junior Engineer, 9 October 2023]
(A) A pair of parallel mountain chains
(B) A low, ring-shaped coral island or reef
(C) A flat-topped undersea volcano only
(D) A gently sloping ocean basin
Answer: (B) A low, ring-shaped coral island or reef
Explanation: An atoll is a roughly ring-shaped coral reef or island enclosing a lagoon, commonly formed around a subsiding volcanic foundation. India’s Lakshadweep includes atolls. Such reef systems harbour marine biodiversity and require protection from bleaching and pollution.
Q51. Match the islands with oceans:
A. Galápagos; B. Canary; C. Diego Garcia; D. New Siberian Islands.
I. Indian; II. Pacific; III. Atlantic; IV. Arctic.
[RPSC Senior Teacher Grade-II, 29 January 2023]
(A) A–II, B–I, C–III, D–IV
(B) A–III, B–II, C–I, D–IV
(C) A–II, B–III, C–IV, D–I
(D) A–II, B–III, C–I, D–IV
Answer: (D) A–II, B–III, C–I, D–IV
Explanation: The Galápagos are in the Pacific, the Canaries in the Atlantic, Diego Garcia in the Indian Ocean and the New Siberian Islands in the Arctic. Such island distributions are relevant to oceanic biodiversity, navigation and geopolitical geography.
