Water Board

Total Questions: 38

31. The tides in the sea are primarily due to __ [S.SC. Online C.G.L(T-1) 3.09.2016 (Shift-II)]

(a) The atmospheric effect of the Earth
(b) The gravitational effect of Venus on the Earth
(c) The gravitational effect of the Sun on the Earth
(d) The gravitational effect of the Moon on the Earth

Correct Answer: (d) The gravitational effect of the Moon on the Earth

Solution:The tidal waves in the sea are primarily due to the gravitational effect of the moon on the earth.

Day 56 -Q 1. What are tides? How do tides form? Explain. What is the significance of tides for marine ecology? Discuss. | IASbaba

32. The rhythmic rise and fall of ocean water twice in a day is called __ [S.S.C. Online CHSL (T-1) 18 2020 (Shift-1)]

(a) Wave
(b) Tide
(c) Tsunami
(d) Current

Correct Answer: (b) Tide

Solution:The rhythmic rise and fall of ocean water twice in a day is called Tide.

How Tides Are Formed:

Gravitational Pull of the Moon:
- The Moon pulls ocean water on the side of Earth closest to it, causing a high tide.
- At the same time, on the opposite side of Earth, water also bulges due to inertia, causing another high tide.
Low Tides:
- In areas between the two bulges, the water level falls, resulting in low tides.
Role of the Sun:
- The Sun also exerts a gravitational pull.
- When the Sun, Moon, and Earth align (new moon/full moon), tides are stronger (called Spring Tides).
- When the Sun and Moon are at right angles (first and last quarter), tides are weaker (called Neap Tides).

33. What is the average salt content in seawater? [C.P.O. S.I. 5.06.2016 (Shift-II)]

(a) 12.3%
(b) 1%
(c) 3.5%
(d) 10%

Correct Answer: (c) 3.5%

Solution:The average salt content in seawater is about 3.5% i.e. 35 g/L.

34. Identify the factor that does NOT affect the salinity of the ocean. [S.S.C. Online CHSL (T-1) 03.06.2022 (Shift-II)]

(a) The amount of fresh water flowing into the ocean
(b) Wind
(c) The type of marine organisms found in the water bodies
(d) The rate of evaporation and precipitation

Correct Answer: (c) The type of marine organisms found in the water bodies

Solution:Sea water salinity is expressed as a salt (in grams) ratio to a litre of water.

Seawater typically has close to 35 grams of dissolved salts in each litre. It is written as 35%.

The usual range of ocean salinity ranges between 33-37 grams per litre (33%-37%).

Factors that affect the salitity of the ocean are:-

Evaporation.
Precipitation
The Influx of River Water
Atmospheric Pressure and Wind Direction
Circulation of Oceanic Water

35. El Nino' that affects our Monsoons, has its origins in ____ [C.P.O. S.1.5.06.2016 (Shift-1)]

(a) The Indian Ocean
(b) The Himalayan plateau
(c) The Pacific Ocean
(d) The Arabian Peninsula

Correct Answer: (c) The Pacific Ocean

Solution:The 'El Nino' is a warm current, from the Pacific Ocoun. It influences the Indian monsoon, which causes less rainfall in India.

36. Along the coast of which country El Nino flows? [CPO. SL 7.06.2016 (Shift-1)]

(a) Sri Lanka
(b) China
(c) Peru
(d) Japan

Correct Answer: (c) Peru

Solution:El Nino is a warm current that flows along the coast of Ecuador and Peru, located on the west coast of South America.

37. Suez Canal connects- [S.S.C. Online CGL(T-I) 7.09.2016 (Shift-3)]

(a) Red Sea and Arabian Sea
(b) Red Sea and Mediterranean Sea
(c) Arabian Sea and Mediterrancan Sca
(d) North Sea and Baltic Sen

Correct Answer: (b) Red Sea and Mediterranean Sea

Solution:The Suez Canal is a man-made waterway connecting the Mediterranean Sea to the Indian Ocean via the Red Sea.

Important Straits of the World

Strait	Connects	Separates	Significance
Strait of Gibraltar	Atlantic Ocean & Mediterranean Sea	Europe (Spain) & Africa (Morocco)	Entry/exit point of Mediterranean Sea
Strait of Hormuz	Persian Gulf & Gulf of Oman	Iran & Oman (Musandam)	Vital for oil shipping from Gulf countries
Strait of Malacca	Andaman Sea & South China Sea	Malaysia & Indonesia	Major shipping route between Asia and the Middle East
Palk Strait	Bay of Bengal & Gulf of Mannar	India (Tamil Nadu) & Sri Lanka	Historical and cultural significance
Bering Strait	Bering Sea & Chukchi Sea	Russia & USA (Alaska)	Connects Asia and North America
Bosporus Strait	Black Sea & Sea of Marmara	European & Asian parts of Turkey	Key waterway in Istanbul
Dardanelles Strait	Aegean Sea & Sea of Marmara	European & Asian parts of Turkey	Historic military and trade route
Panama Canal	Atlantic Ocean & Pacific Ocean (via artificial canal)	Cuts across Panama	Key for global trade between East and West
Suez Canal	Mediterranean Sea & Red Sea (via artificial canal)	Cuts across Egypt	Crucial for Europe-Asia maritime trade
Dover Strait	North Sea & English Channel	England & France	Narrowest part between Britain and mainland Europe
Bab-el-Mandeb	Red Sea & Gulf of Aden	Yemen & Djibouti/Eritrea	Gate to Suez Canal, vital trade route
Mozambique Channel	Indian Ocean	Madagascar & Mozambique	Important for Southern Africa shipping lanes
Cook Strait	Tasman Sea & South Pacific Ocean	North & South Islands of New Zealand	Local navigation importance
Taiwan Strait	East China Sea & South China Sea	China & Taiwan	Strategic military and trade importance

38. Which port is located at the northern entrance to the Suez Canal? [S.S.C. Online Stenographer 13.09.2017 (Shift-II)]

(a) Cairo
(b) Port Said
(c) Port Rotterdam
(d) Port Alexandria

Correct Answer: (b) Port Said

Solution:Port Said is located at the northern entrance of the Suez Canal, while Port Suez is located at its southern entrance.

This canal connects the Red Sea with the Mediterranean Sea.

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