WATER

Q1: An artificial enclosure for keeping small house plants is called………………………

Ans:Terrarium

Q2: The major source of fresh water is the rivers, ponds, springs, and glaciers. (T/F)

Ans:True

Q3: Two third of the earth surface is covered by water. (T/F)

Ans:False

Q4: …………… is celebrated as world water day.

Ans:22nd march

Q6: During neap tide sun, moon and earth lies in straight line.(T/F)

Ans:False

Q7: High tide helps in navigation. (T/F)

Ans:True

Q8: The areas where warm and cold current meet provide the best fishing grounds of the world. (T/F)

Ans:True

Q8: The areas where warm and cold current meet provide the best fishing grounds of the world. (T/F)

Ans:True

Q9: …………………is the southernmost point of India.

Ans:Indira point

Q13: Sodium chloride salt is mostly dissolved in ocean and sea water. (T/F)

Ans:True

Q14: Salinity is the amount of salt in grams present in …………grams of water.

Ans:1000

Q15: The……………… of earth surface is covered by water.

Ans:Three fourth

Q17: ………………are formed when gentle winds scraps across the ocean surface.

Ans:Waves

Q18: Indira point belongs to which of the following country?

1. Srilanka
2. Bangladesh
3. Nepal
4. India

Ans:India

Q19: Seismic activity is more prone in Pacific Ocean (T/F)

Ans:True

Q20: Rapid withdrawal of water from the coastal region gives the warning of –

1. Earth quake
2. Tsunami
3. Flood
4. Volcanism

Ans:Tsunami

                                       Short Answer Type Questions

Q1: Define salinity.

Ans:Salinity is amount of salt in grams present in 1000 gm of water. The average salinity of the ocean is 35 parts per thousand

Q5: Why ocean bodies and sea contain salty water?

Ans:Because it contains the large amount of dissolved salts. Most of the salt is sodium chloride.

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Q6: Name the factors which are responsible for the movement of oceanic water?

Ans:The factors are-

a.     Winds

b.     Temperature

c.     Coriolis force

d.     Attraction of moon and sun depending upon its distances.

Q8: How tides are formed?

Ans:Tides are periodic rise and fall in the level of water in seas and ocean caused by the attraction of the moon and the sun. Twice a day, about every 12 hours and 26 minutes, the sea level rise and it falls.

Q9: What is an ocean current

Ans:Ocean currents are stream of water flowing constantly on the ocean surface in definite direction.