Choose happiness daily while you prepare for competitive and qualifying exams.
This is because a positive mindset is like a great gym for your focus, resilience, and motivation.
Getting joy as a kind of beacon makes studying lighter and you can do it for longer, even when times get tough in your preparation.
Keep finding good in everythinglike in small gains, the learning from your errors, and the instances of getting bettersince growth is usually the result of effort.
It goes without saying that a positive mind breeds a positive life, which in turn influences your working habits, coping mechanisms, and your performing.
You get the kind of things you think about most, so make sure to keep your thoughts in harmony with confidence, success, and faith in your own ability.
Note- Attend all 200 Questions Compulsory with Right Answer For Contest Continue & chase Competition ⤵️
Be positive, be consistent, and allow positivity to be your guide in the journey of your qualification success.
1. The study of marine life is called:
A. Oceanography
B. Marine biology
C. Ichthyology
D. Limnology
2. Which is the largest animal ever known?
A. Elephant
B. Blue whale
C. Great white shark
D. Sperm whale
3. Fish breathe using:
A. Lungs
B. Skin
C. Gills
D. Trachea
4. Which animal is known as a marine mammal?
A. Shark
B. Dolphin
C. Octopus
D. Seahorse
5. Dolphins belong to the group:
A. Fish
B. Reptiles
C. Mammals
D. Amphibians
6. Which sea animal has eight arms?
A. Squid
B. Octopus
C. Jellyfish
D. Starfish
7. Which marine animal is known for bioluminescence?
A. Crab
B. Jellyfish
C. Lobster
D. Seahorse
8. Coral reefs are built by:
A. Plants
B. Algae
C. Coral polyps
D. Sponges
9. Which sea animal has a hard external shell?
A. Shark
B. Octopus
C. Turtle
D. Clam
10. Whales communicate using:
A. Light
B. Chemical signals
C. Sounds
D. Electric fields
11. The fastest sea animal is:
A. Dolphin
B. Sailfish
C. Tuna
D. Shark
12. Which fish is cartilaginous?
A. Salmon
B. Tuna
C. Shark
D. Cod
13. Seahorses belong to which group?
A. Mammals
B. Reptiles
C. Fish
D. Amphibians
14. Which marine animal filters water for food?
A. Shark
B. Whale shark
C. Dolphin
D. Octopus
15. Which animal is known as the “ship of the sea”?
A. Whale
B. Turtle
C. Seal
D. Dolphin
16. Which sea animal has a radial body symmetry?
A. Fish
B. Dolphin
C. Starfish
D. Crab
17. The largest group of marine animals is:
A. Mammals
B. Fish
C. Reptiles
D. Birds
18. Which animal uses ink as defense?
A. Jellyfish
B. Octopus
C. Shark
D. Crab
19. Which sea animal has tentacles with stinging cells?
A. Squid
B. Jellyfish
C. Octopus
D. Fish
20. Which marine animal migrates long distances?
A. Seahorse
B. Clownfish
C. Whale
D. Crab
21. The main food source for many sea animals is:
A. Coral
B. Plankton
C. Sand
D. Rocks
22. Which animal is known as the “gardener of the sea”?
A. Sea urchin
B. Parrotfish
C. Shark
D. Octopus
23. Which fish lives in coral reefs?
A. Salmon
B. Tuna
C. Clownfish
D. Eel
24. Which marine animal has no brain?
A. Starfish
B. Dolphin
C. Shark
D. Whale
25. Which animal has the largest eyes?
A. Dolphin
B. Giant squid
C. Shark
D. Whale
26. Which marine animal breathes air but lives in water?
A. Fish
B. Shark
C. Whale
D. Octopus
27. Which sea animal has a beak?
A. Octopus
B. Dolphin
C. Shark
D. Crab
28. Which animal forms schools?
A. Whale
B. Fish
C. Octopus
D. Turtle
29. Which marine animal has five arms?
A. Crab
B. Starfish
C. Squid
D. Jellyfish
30. Which sea animal is endangered worldwide?
A. Tuna
B. Sea turtle
C. Sardine
D. Anchovy
31. Which marine animal has electroreception?
A. Dolphin
B. Shark
C. Whale
D. Seal
32. Which animal produces pearls?
A. Crab
B. Oyster
C. Snail
D. Lobster
33. The largest coral reef system is:
A. Red Sea Reef
B. Caribbean Reef
C. Great Barrier Reef
D. Maldives Reef
34. Which sea animal is known as “living fossil”?
A. Coelacanth
B. Shark
C. Whale
D. Ray
35. Which animal has tube feet?
A. Octopus
B. Starfish
C. Crab
D. Fish
36. Which marine animal is venomous?
A. Dolphin
B. Lionfish
C. Whale
D. Seal
37. Which sea animal has a spiral shell?
A. Octopus
B. Nautilus
C. Squid
D. Jellyfish
38. Which marine animal is a cephalopod?
A. Crab
B. Octopus
C. Lobster
D. Starfish
39. Which animal cleans coral reefs?
A. Shark
B. Parrotfish
C. Dolphin
D. Seal
40. Which marine reptile lives in oceans?
A. Crocodile
B. Sea turtle
C. Lizard
D. Snake
41. Which animal is apex predator of oceans?
A. Tuna
B. Dolphin
C. Shark
D. Seal
42. Which marine animal has the longest lifespan?
A. Dolphin
B. Greenland shark
C. Whale
D. Octopus
43. Which animal is planktonic?
A. Jellyfish
B. Shark
C. Dolphin
D. Turtle
44. Which animal produces sound waves for navigation?
A. Shark
B. Dolphin
C. Octopus
D. Crab
45. Which marine animal has chromatophores?
A. Dolphin
B. Shark
C. Octopus
D. Whale
46. Which animal has blue blood?
A. Fish
B. Octopus
C. Dolphin
D. Whale
47. Which marine animal uses jet propulsion?
A. Shark
B. Octopus
C. Whale
D. Seal
48. Which sea animal lives in deep ocean trenches?
A. Tuna
B. Anglerfish
C. Dolphin
D. Turtle
49. Which marine species forms kelp forests?
A. Coral
B. Seaweed
C. Sponge
D. Plankton
50. Which marine animal lacks a backbone?
A. Dolphin
B. Shark
C. Octopus
D. Tuna
51. Which sea animal has echolocation?
A. Shark
B. Dolphin
C. Turtle
D. Crab
52. Which marine animal has a mantle?
A. Crab
B. Octopus
C. Fish
D. Whale
53. Which animal protects itself using camouflage?
A. Dolphin
B. Shark
C. Octopus
D. Seal
54. Which marine animal is herbivorous?
A. Shark
B. Manatee
C. Dolphin
D. Seal
55. Which animal has spines?
A. Sea urchin
B. Dolphin
C. Whale
D. Seal
56. Which marine animal is an echinoderm?
A. Crab
B. Starfish
C. Octopus
D. Fish
57. Which animal produces coral bleaching when stressed?
A. Fish
B. Algae
C. Coral polyps
D. Plankton
58. Which marine animal can regenerate arms?
A. Dolphin
B. Shark
C. Starfish
D. Whale
59. Which sea animal is filter feeder?
A. Dolphin
B. Whale shark
C. Octopus
D. Seal
60. Which marine animal has no bones?
A. Dolphin
B. Shark
C. Octopus
D. Tuna
61. Which animal uses lateral line system?
A. Fish
B. Dolphin
C. Whale
D. Turtle
62. Which marine animal can live in freshwater and saltwater?
A. Dolphin
B. Salmon
C. Octopus
D. Seahorse
63. Which animal is known as “sea cow”?
A. Seal
B. Manatee
C. Dolphin
D. Walrus
64. Which marine animal has tusks?
A. Dolphin
B. Walrus
C. Shark
D. Seal
65. Which marine animal has the largest brain?
A. Dolphin
B. Sperm whale
C. Shark
D. Octopus
66. Which sea animal lays eggs on land?
A. Fish
B. Sea turtle
C. Dolphin
D. Seal
67. Which animal has a cartilaginous skeleton?
A. Tuna
B. Shark
C. Dolphin
D. Whale
68. Which marine animal has symbiosis with algae?
A. Shark
B. Coral
C. Dolphin
D. Seal
69. Which sea animal is a crustacean?
A. Octopus
B. Crab
C. Dolphin
D. Turtle
70. Which animal has compound eyes?
A. Whale
B. Crab
C. Dolphin
D. Seal
71. Which marine animal produces sound clicks?
A. Shark
B. Dolphin
C. Turtle
D. Crab
72. Which animal lives in shells?
A. Dolphin
B. Hermit crab
C. Shark
D. Whale
73. Which marine animal has tentacles with suckers?
A. Jellyfish
B. Octopus
C. Starfish
D. Crab
74. Which animal forms massive swarms?
A. Whale
B. Jellyfish
C. Shark
D. Dolphin
75. Which marine animal has the thickest blubber?
A. Dolphin
B. Seal
C. Whale
D. Shark
76. Which animal can survive extreme pressure?
A. Tuna
B. Deep-sea fish
C. Dolphin
D. Turtle
77. Which marine animal is used as indicator species?
A. Shark
B. Coral
C. Dolphin
D. Seal
78. Which sea animal produces venom through spines?
A. Stingray
B. Dolphin
C. Whale
D. Seal
79. Which marine animal is known for intelligence?
A. Shark
B. Dolphin
C. Turtle
D. Crab
80. Which animal feeds on plankton mainly?
A. Blue whale
B. Shark
C. Dolphin
D. Seal
81. The main salt in seawater is:
A. Potassium chloride
B. Sodium chloride
C. Calcium carbonate
D. Magnesium sulfate
82. The most abundant element in seawater is:
A. Sodium
B. Chlorine
C. Oxygen
D. Magnesium
83. Ocean water salinity is measured in:
A. Percent
B. ppm
C. PSU
D. kg
84. Which mineral forms coral skeletons?
A. Quartz
B. Calcium carbonate
C. Silica
D. Sodium chloride
85. Which element gives seawater its salty taste?
A. Sodium
B. Magnesium
C. Calcium
D. Potassium
86. The average salinity of seawater is about:
A. 20‰
B. 25‰
C. 35‰
D. 40‰
87. Which gas is dissolved most in seawater?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
88. The main source of ocean minerals is:
A. Volcanoes only
B. River runoff
C. Glaciers
D. Icebergs
89. Which material is extracted from seawater?
A. Iron
B. Salt
C. Coal
D. Uranium
90. Ocean floor nodules contain mainly:
A. Gold
B. Manganese
C. Aluminum
D. Silicon
91. Which element is essential for marine shells?
A. Iron
B. Calcium
C. Zinc
D. Copper
92. The chemical formula of salt is:
A. NaCO₃
B. NaCl
C. CaCO₃
D. MgSO₄
93. Which metal is found dissolved in seawater?
A. Copper
B. Uranium
C. Gold
D. Lead
94. Which material forms sand on beaches?
A. Quartz
B. Iron
C. Coal
D. Salt
95. Which element controls ocean acidity?
A. Oxygen
B. Carbon
C. Nitrogen
D. Helium
96. Which gas causes ocean acidification?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
97. Which mineral is found in marine evaporites?
A. Salt
B. Quartz
C. Feldspar
D. Mica
98. Which element is essential for plankton growth?
A. Iron
B. Gold
C. Silver
D. Mercury
99. Which material forms sea cliffs?
A. Plastic
B. Rock
C. Ice
D. Salt
100. Which ocean resource is renewable?
A. Oil
B. Gas
C. Fish
D. Minerals
101. The most abundant element in Earth’s crust is:
A. Silicon
B. Oxygen
C. Aluminum
D. Iron
102. Which element is vital for marine life respiration?
A. Oxygen
B. Hydrogen
C. Nitrogen
D. Helium
103. Which metal resists corrosion in seawater?
A. Iron
B. Copper
C. Gold
D. Zinc
104. Which element is used in desalination plants?
A. Chlorine
B. Sodium
C. Calcium
D. Iron
105. Which compound causes scale in seawater pipes?
A. NaCl
B. CaCO₃
C. MgSO₄
D. KCl
106. Which element is radioactive in ocean water?
A. Uranium
B. Iron
C. Calcium
D. Silicon
107. Which mineral is used to make glass?
A. Quartz
B. Coal
C. Gypsum
D. Salt
108. Which element is essential for photosynthesis in oceans?
A. Carbon
B. Oxygen
C. Nitrogen
D. All of the above
109. Which metal is used in shipbuilding?
A. Aluminum
B. Iron
C. Steel
D. All
110. Which element is required for coral growth?
A. Sodium
B. Calcium
C. Iron
D. Zinc
111. Which ocean material stores carbon?
A. Sand
B. Coral
C. Limestone
D. All
112. Which element makes seawater conductive?
A. Sodium
B. Chlorine
C. Dissolved salts
D. Oxygen
113. Which mineral forms deep-sea chimneys?
A. Sulfides
B. Quartz
C. Feldspar
D. Gypsum
114. Which element is used in marine batteries?
A. Lithium
B. Gold
C. Iron
D. Copper
115. Which element is most abundant in seawater by mass?
A. Oxygen
B. Sodium
C. Chlorine
D. Magnesium
116. Which element causes rusting of ships?
A. Oxygen
B. Carbon
C. Nitrogen
D. Hydrogen
117. Which mineral is used in marine cement?
A. Limestone
B. Quartz
C. Mica
D. Coal
118. Which ocean material forms oil?
A. Dead plankton
B. Sand
C. Salt
D. Rocks
119. Which element helps regulate ocean pH?
A. Calcium
B. Carbonate
C. Sodium
D. Zinc
120. Which element is used in antifouling paints?
A. Copper
B. Iron
C. Aluminum
D. Zinc
121. Which gas is released from oceans to atmosphere?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. All
122. Which mineral is found in sea salt?
A. Sodium
B. Chlorine
C. Magnesium
D. All
123. Which element is essential for marine enzymes?
A. Iron
B. Gold
C. Silver
D. Lead
124. Which material makes shells hard?
A. Calcium carbonate
B. Sodium chloride
C. Quartz
D. Silica
125. Which element is used in underwater cables?
A. Iron
B. Copper
C. Zinc
D. Aluminum
126. Which mineral is mined from ocean floor?
A. Manganese
B. Coal
C. Limestone
D. Gypsum
127. Which element is essential for fish bones?
A. Calcium
B. Sodium
C. Potassium
D. Iron
128. Which element increases seawater density?
A. Oxygen
B. Salts
C. Hydrogen
D. Nitrogen
129. Which ocean element absorbs heat?
A. Water
B. Sand
C. Salt
D. Iron
130. Which material forms coral reefs?
A. Sand
B. Calcium carbonate
C. Quartz
D. Salt
131. Which element is used in sonar equipment?
A. Silicon
B. Copper
C. Aluminum
D. Gold
132. Which mineral forms seabed clay?
A. Kaolinite
B. Quartz
C. Gypsum
D. Salt
133. Which element is essential for DNA in marine life?
A. Phosphorus
B. Iron
C. Zinc
D. Sodium
134. Which compound causes ocean buffering?
A. Carbonate system
B. Chloride
C. Sulfate
D. Nitrate
135. Which element is used in ship propellers?
A. Aluminum
B. Bronze
C. Iron
D. Zinc
136. Which mineral is common in sea sand?
A. Quartz
B. Coal
C. Salt
D. Mica
137. Which element is required for shellfish growth?
A. Calcium
B. Nitrogen
C. Iron
D. Zinc
138. Which element helps marine plants grow?
A. Nitrogen
B. Gold
C. Silver
D. Mercury
139. Which element is used in underwater welding?
A. Iron
B. Magnesium
C. Aluminum
D. Copper
140. Which element causes eutrophication?
A. Nitrogen
B. Gold
C. Zinc
D. Helium
141. Which ocean material forms beach sand?
A. Quartz
B. Iron
C. Salt
D. Coal
142. Which element is used in marine electronics?
A. Silicon
B. Iron
C. Lead
D. Zinc
143. Which mineral is used in antifreeze?
A. Salt
B. Gypsum
C. Quartz
D. Feldspar
144. Which element forms seawater ions?
A. Sodium
B. Chlorine
C. Both A and B
D. Iron
145. Which element is essential for marine respiration cycles?
A. Oxygen
B. Carbon
C. Nitrogen
D. All
146. Which mineral is used in desalination membranes?
A. Polymer-based materials
B. Quartz
C. Gypsum
D. Salt
147. Which element increases ocean conductivity?
A. Iron
B. Dissolved salts
C. Oxygen
D. Hydrogen
148. Which ocean element supports buoyancy?
A. Salt
B. Iron
C. Carbon
D. Zinc
149. Which material is used in ship hulls?
A. Wood
B. Steel
C. Aluminum
D. All
150. Which element is used to prevent corrosion?
A. Zinc
B. Iron
C. Lead
D. Carbon
151. Which mineral forms deep-sea vents?
A. Sulfides
B. Salt
C. Quartz
D. Clay
152. Which element is essential for plankton photosynthesis?
A. Iron
B. Gold
C. Silver
D. Mercury
153. Which compound is responsible for seawater buffering?
A. Sodium chloride
B. Carbonate system
C. Iron oxide
D. Silica
154. Which element is used in marine paints?
A. Copper
B. Iron
C. Aluminum
D. Carbon
155. Which ocean element stores heat energy?
A. Water
B. Sand
C. Salt
D. Rock
156. Which mineral is found in coral sand?
A. Calcium carbonate
B. Quartz
C. Feldspar
D. Mica
157. Which element is vital for enzyme reactions?
A. Iron
B. Gold
C. Lead
D. Mercury
158. Which element helps control marine acidity?
A. Carbonate
B. Iron
C. Zinc
D. Sodium
159. Which element is used in marine fuel cells?
A. Hydrogen
B. Iron
C. Copper
D. Aluminum
160. Which mineral is used in underwater concrete?
A. Limestone
B. Gypsum
C. Quartz
D. Coal
161. Which ocean element supports life balance?
A. Oxygen
B. Nitrogen
C. Carbon
D. All
162. Which element is essential for marine food chains?
A. Iron
B. Gold
C. Silver
D. Mercury
163. Which element is used in ocean sensors?
A. Silicon
B. Lead
C. Iron
D. Zinc
164. Which mineral contributes to seawater hardness?
A. Calcium
B. Iron
C. Zinc
D. Gold
165. Which element increases buoyancy of seawater?
A. Salt
B. Iron
C. Carbon
D. Hydrogen
166. Which ocean material forms sedimentary rocks?
A. Sand
B. Shells
C. Mud
D. All
167. Which element is used in submarine batteries?
A. Lithium
B. Copper
C. Iron
D. Zinc
168. Which compound is used in desalination pretreatment?
A. Chlorine
B. Quartz
C. Gypsum
D. Iron
169. Which element supports marine oxygen cycles?
A. Carbon
B. Oxygen
C. Nitrogen
D. All
170. Which mineral is common in marine mud?
A. Clay
B. Quartz
C. Salt
D. Coal
171. Which element is essential for coral skeletons?
A. Calcium
B. Iron
C. Zinc
D. Sodium
172. Which ocean material absorbs CO₂?
A. Water
B. Sand
C. Salt
D. Iron
173. Which element helps prevent biofouling?
A. Copper
B. Iron
C. Carbon
D. Sodium
174. Which mineral is found in deep-sea nodules?
A. Manganese
B. Coal
C. Gypsum
D. Quartz
175. Which element is needed for protein synthesis?
A. Nitrogen
B. Gold
C. Mercury
D. Lead
176. Which ocean element regulates temperature?
A. Water
B. Sand
C. Salt
D. Iron
177. Which mineral supports marine construction?
A. Limestone
B. Coal
C. Salt
D. Mica
178. Which element is essential for chlorophyll?
A. Magnesium
B. Iron
C. Zinc
D. Copper
179. Which element contributes to seawater alkalinity?
A. Carbonate
B. Iron
C. Zinc
D. Gold
180. Which ocean resource is renewable?
A. Oil
B. Gas
C. Fish
D. Minerals
181. Which mineral is used in underwater cables insulation?
A. Polymer materials
B. Quartz
C. Gypsum
D. Salt
182. Which element is used in marine sensors?
A. Silicon
B. Iron
C. Lead
D. Zinc
183. Which ocean element supports marine respiration?
A. Oxygen
B. Carbon
C. Nitrogen
D. Hydrogen
184. Which mineral is essential for shell hardness?
A. Calcium carbonate
B. Quartz
C. Iron
D. Salt
185. Which element is used in marine alloys?
A. Aluminum
B. Iron
C. Copper
D. All
186. Which ocean material forms limestone?
A. Coral shells
B. Sand
C. Salt
D. Clay
187. Which element is critical for ocean productivity?
A. Iron
B. Gold
C. Silver
D. Mercury
188. Which element increases ocean salinity?
A. Salt
B. Iron
C. Carbon
D. Nitrogen
189. Which mineral is used in seawater desalination filters?
A. Polymer membranes
B. Quartz
C. Gypsum
D. Coal
190. Which element supports nerve signals in marine animals?
A. Sodium
B. Gold
C. Mercury
D. Lead
191. Which ocean element is part of water molecule?
A. Oxygen
B. Hydrogen
C. Both A and B
D. Nitrogen
192. Which mineral forms marine sandstones?
A. Quartz
B. Coal
C. Salt
D. Gypsum
193. Which element helps regulate osmotic balance?
A. Sodium
B. Iron
C. Gold
D. Lead
194. Which ocean material forms sediment layers?
A. Mud
B. Sand
C. Shells
D. All
195. Which element is essential for marine metabolism?
A. Iron
B. Gold
C. Mercury
D. Lead
196. Which mineral is found in marine evaporites?
A. Salt
B. Quartz
C. Mica
D. Feldspar
197. Which element is used in marine electronics chips?
A. Silicon
B. Iron
C. Lead
D. Zinc
198. Which element is essential for coral reef health?
A. Calcium
B. Gold
C. Silver
D. Mercury
199. Which ocean element helps maintain pH balance?
A. Carbonate
B. Iron
C. Zinc
D. Lead
200. Which element is essential for life in oceans?
A. Oxygen
B. Gold
C. Mercury
D. Lead
