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-thirds of the earth's surface is covered by water. (T/F)
Ans: False
Q4: …………… is celebrated as World Water Day.
Ans: 22nd March
Q5: The rhythmic rise and fall of ocean water twice in a day is called…………………
Ans: Tide
Q6: During neap tide sun, moon, and earth lie in a straight line. (T/F)
Ans: False
Q7: High tide helps in navigation. (T/F)
Ans: True
Q8: The areas where warm and cold currents meet provide the best fishing grounds in the world. (T/F)
Ans: True
Q9: …………………is the southernmost point of India.
Ans: Indira point
Q10: The process by which water continuously changes its form and circulates between ocean, atmosphere, and land is called……………….
Ans: Water cycle
Q11: Match the following-
Ans :
Q12: The ocean bodies and seas contain salty water. (T/F)
a. Troposphere
b. Stratosphere
c. Mesosphere
d. Exosphere
Ans: True
Ocean bodies and seas indeed contain salty water. This statement is true because oceans have an average salinity of about 3.5%, primarily due to the minerals and salts that are washed into them from land and other sources.
Q13: Sodium chloride salt is mostly dissolved in the ocean and seawater. (T/F)
Ans: True
Q14: Salinity is the amount of salt in grams present in …………grams of water.
Ans: 1000
Q15: The……………… of earth's surface is covered by water.
Ans: Three-fourth
Q16: Which amongst the following has the maximum coverage of water on the earth's surface-
a. Ground water
b. Ice caps
c. Ocean
d. River
Ans: Ocean
Oceans have the maximum coverage of water on Earth's surface, accounting for about 97% of all Earth's water. They cover approximately 71% of the planet, making them the largest bodies of water on Earth.
Q17: ………………are formed when gentle winds scraps across the ocean surface.
Ans: Waves
Q18: Indira Point belongs to which of the following countries?
a. Sri Lanka
b. Bangladesh
c. Nepal
d. India
Ans: India
Indira Point is located in India. It is the southernmost tip of the Nicobar Islands, which are part of India's territory in the Bay of Bengal.
Q19: Seismic activity is more prone in the Pacific Ocean (T/F)
Ans: True
Q20: Rapid withdrawal of water from the coastal region gives the warning of –
a. Earthquake
b. Tsunami
c. Flood
d. Volcanism
Ans: Tsunami
The rapid withdrawal of water from the coast signals a tsunami. This occurs when a massive disturbance, like an earthquake, displaces water, causing it to pull back before the waves hit. This sudden drop in sea level is a crucial warning to evacuate the area before the tsunami strikes.
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