21. Which of the following is a continental shelf sea

1. 1. North Sea

   
   
   

   2. Arabian Sea

   
   
   

   3. Red sea

   
   
   

   4. Mediterranean sea

   
   
   

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   NA

   Correct Option: C

   NA

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22. The portion of the earth's surface covered with water is roughly

1. 1. One-fourth

   
   
   

   2. One-half

   
   
   

   3. Two-third

   
   
   

   4. Three-fifth

   
   
   

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   NA

   Correct Option: C

   NA

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23. An Atoll is

1. 1. a ring shaped island with a lagoon at the centre

   
   
   

   2. A lake in glaciated mountains

   
   
   

   3. a lagoon along the shores

   
   
   

   4. a lake in the craters

   
   
   

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   NA

   Correct Option: A

   NA

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24. A submarine mountain rising more than 1000 meters above the ocean floor is known as

1. 1. sea mount

   
   
   

   2. abyssal hill

   
   
   

   3. guyots

   
   
   

   4. submarine ridge

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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25. Oceanic waves caused by an earthquake are known as

1. 1. S- waves

   
   
   

   2. L-waves

   
   
   

   3. P-waves

   
   
   

   4. Tsunamis

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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