WATER MCQ AND QUESTIONS

 An artificial enclosure for keeping small house plants is called ____________

Answer: Terrarium

 The major source of fresh water is the rivers, ponds, springs, and glaciers. (T/F)

Answer: True

____________ is celebrated as world water day.

Answer: 22nd march

The rhythmic rise and fall of ocean water twice in a day is called ____________

Answer: Tide

During neap tide sun, moon and earth lies in straight line.(T/F)

 ____________ is the southernmost point of India.

Answer:  Indira point

Which is the largest lake in the world?

Answer: Caspian Sea

What is meant by the term salinity?

Answer: Salinity is the amount of salt in grams present in 1000 grams of water.

What is the salinity of Dead Sea?

Answer: Dead Sea in Israel has salinity of 340 grams per litre of water.

How is it possible to float in the Dead Sea?

Answer: Swimmers can float in it because the increased salt content makes it dense.

What happened to the Indira point during the tsunami of 2004?

Answer: The Indira point in the Andaman and Nicobar islands got submerged after the tsunami.

 Name one warm ocean current and one cold ocean current?

Answer: The Labrador Ocean current is cold current while the Gulf Stream is a warm current.

What is Tsunami?

Answer: Tsunami is a series of huge tidal waves caused by earthquakes or other disturbance under the sea.

Where does the word tsunami come from and what does it mean?

Answer: Tsunami is a Japanese word that means “Harbour waves” as the harbours get destroyed whenever there is tsunami.

What is precipitation?

Answer: Precipitation is any type of water that forms in the Earth’s atmosphere and then drops onto the surface of the Earth.

hat is water cycle?

Answer: The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.

Why is our earth like a terrarium?

Answer: Our earth is like a terrarium. The same water that existed centuries ago still exists today. The water used to irrigate a field in Haryana may have flowed down the Amazon River a hundred years ago.

What are spring and neap tides?

Answer: The water of the earth closer to the moon gets pulled under the influence of the moon’s gravitational force and causes high tide. During the full moon and new moon days, the sun, the moon and the earth are in the same line and the tides are highest. These tides are called spring tides. But when the moon is in its first and last quarter, the ocean waters get drawn in diagonally opposite directions by the gravitational pull of sun and earth resulting in low tides. These tides are called neap tides.

Why are tides important to us?

Answer: Tides important to us because:

• High tides help in navigation.
• They raise the water level close to the shores. This helps the ships to arrive at the harbour more easily.
• The high tides also help in fishing. Many more fish come closer to the shore during the high tide. This enables fishermen to get a plentiful catch.
• The rise and fall of water due to tides is being used to generate electricity in some places.

Write a short note on Tsunami?

Answer: 

• Tsunami is a Japanese word that means “Harbour waves” as the harbours get destroyed whenever there is tsunami.
• An earthquake, a volcanic eruption or underwater landslides can shift large amounts of ocean water.
• As a result a huge tidal wave called tsunami, that may be as high as 15m., is formed. The largest tsunami ever measured was 150m. high. These waves travel at a speed of more than 700 km. per hour.
• The tsunami of 2004 caused wide spread damage in the coastal areas of India. The Indira point in the Andaman and Nicobar islands got submerged after the tsunami.

Write a short note on ocean currents?

Answer: (i) Ocean currents are streams of water flowing constantly on the ocean surface in definite directions.

(ii) The ocean currents may be warm or cold. Generally, the warm ocean currents originate near the equator and move towards the poles. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. The Labrador Ocean current is cold current while the Gulf Stream is a warm current.

(iii) The ocean current influence the temperature conditions of the area. Warm currents bring about warm temperature over land surface. The areas where the warm and cold currents meet provide the best fishing grounds of the world.     

(iv) Seas around Japan and the eastern coast of North America are such examples.  The areas where a warm and cold current meet also experience foggy weather making it difficult for navigation.

What are the major movements of ocean water?

Answer: The movements that occur in oceans can be broadly categorised as: waves, tides and currents.

Waves: When the water on the surface of the ocean rises and falls alternately, they are called waves. Waves are formed when winds scrape across the ocean surface. The stronger the wind blows, the bigger the wave becomes.

Tides: The rhythmic rise and fall of ocean water twice in a day is called a tide. It is high tide when water covers much of the shore by rising to its highest level. It is low tide when water falls to its lowest level and recedes from the shore. The strong gravitational pull exerted by the sun and the moon on the earth’s surface causes the tides.

Ocean Currents: Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. The ocean currents may be warm or cold. Generally, the warm ocean currents originate near the equator and move towards the poles. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. The Labrador Ocean current is cold current while the Gulf Stream is a warm current.