Underwater World & Diving Quiz. 15 Questions About The Mysteries of The Ocean And Diving Knowledge

1.

Underwater World & Diving Quiz
15 questions about the mysteries of
the ocean and diving knowledge

2.

What is the largest animal in the
ocean?
A. Great White Shark
B. Blue Whale
C. Giant Squid

3.

Correct answer: Blue Whale
The blue whale is the largest animal to have ever lived on Earth, reaching length

4.

Which ocean is the deepest in the
world?
A. Atlantic Ocean
B. Indian Ocean
C. Pacific Ocean

5.

Correct answer: Pacific Ocean
The Mariana Trench in the Pacific Ocean contains the deepest point on Earth, kn

6.

What creature is known for having
three hearts and blue blood?
A. Octopus
B. Jellyfish
C. Sea Urchin

7.

Correct answer: Octopus
Octopuses have three hearts and their blood contains copper-based hemocyani

8.

Which sea creature has no brain or
heart?
A. Starfish
B. Crab
C. Seahorse

9.

Correct answer: Starfish
Starfish (or sea stars) do not have a brain or heart. They rely on a water vascular

10.

What is the main diet of baleen
whales?
A. Large fish
B. Plankton and krill
C. Seaweed

11.

Correct answer: Plankton and krill
Baleen whales filter-feed on small organisms like plankton and krill using comb-

12.

What gas do divers use in their
tanks to avoid nitrogen narcosis
A. Oxygen during deep dives?
B. Helium
C. Carbon Dioxide

13.

Correct answer: Helium
Divers use a gas mixture called heliox (helium and oxygen) for deep dives to avo

14.

What is the name of the suit that
divers wear to stay warm in cold
A. Dry suit
water?
B. Wet suit
C. Swim suit

15.

Correct answer: Dry suit
A dry suit keeps the diver completely dry and is used in very cold water. It differ

16.

What is the term for the dangerous
condition caused by ascending too
A. Decompression
sickness while diving?
quickly
B. Oxygen toxicity
C. Hypothermia

17.

Correct answer: Decompression
sickness
Decompression sickness, also known as 'the bends', happens when nitrogen bu

18.

Which underwater vehicle is used
for exploring deep-sea
A. Submarine
environments?
B. ROV (Remotely Operated Vehicle)
C. Yacht

19.

Correct answer: ROV (Remotely
Operated Vehicle)
ROVs are unmanned, remotely controlled vehicles used for deep-sea exploratio

20.

What is the name of the
international system used for hand
A. DiveSign
signals in scuba diving?
B. ScubaCode
C. Standard Diving Signals

21.

Correct answer: Standard Diving
Signals
Standard Diving Signals are a globally accepted set of hand gestures used under

22.

How deep is the recreational diving
limit for most scuba divers?
A. 18 meters
B. 30 meters
C. 40 meters

23.

Correct answer: 40 meters
The maximum depth for recreational scuba diving is typically 40 meters (130 fee

24.

Which part of the scuba gear
controls buoyancy underwater?
A. Weight belt
B. Buoyancy Control Device (BCD)
C. Regulator

25.

Correct answer: Buoyancy Control
Device (BCD)
The BCD allows divers to control their buoyancy by inflating or deflating the dev

26.

Who was the famous underwater
explorer who co-invented the
A. Robert Ballard
Aqua-Lung?
B. Jacques Cousteau
C. James Cameron

27.

Correct answer: Jacques Cousteau
Jacques Cousteau co-invented the Aqua-Lung in the 1940s, which made modern

28.

Why do divers equalize pressure in
their ears during descent?
A. To improve hearing
B. To avoid ear pain or damage
C. To prevent water from entering the ears

29.

Correct answer: To avoid ear pain
or damage
Equalizing pressure prevents discomfort or injury caused by pressure difference

30.

Which underwater creature can
deliver a deadly shock to humans?
A. Electric eel
B. Moray eel
C. Sea cucumber

31.

Correct answer: Electric eel
Electric eels can generate electric shocks up to 600 volts to stun prey or defend