hydrosphere & oceanography section 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Dolphin Challenger Ridge is located in

a) Indian Ocean

b) Arctic Ocean

c) Atlantic Ocean

d) Pacific Ocean

Question : 2

Gulf stream is

a) a surface wind

b) another name of Jet Stream

c) a river in the gulf

d) an oceanic current

Question : 3

Which of the following conditions for the survival of corals are correct?

1. The water temperature must not fall below 20°C
2. The depth of water should not exceed 30 fathoms
3. The salinity should be less than 10%
4. The water should be free from sediments.

a) 1, 2 and 4

b) 1, 2 and 3

c) 1 and 2

d) 3 and 4

Question : 4

A new type of El Nino called El Nino Modoki appeared in the news. In this context, consider the following statements:

1. Normal El Nino forms in the Central Pacific Ocean whereas El Nino Modoki forms in Eastern Pacific Ocean
2. Normal El Nino results in diminished hurricanes in the Atlantic Ocean but El Nino Modoki results in a greater number of hurricanes with greater frequency.

a) Neither 1 nor 2

b) Both 1 and 2

c) 1 only

d) 2 only

Question : 5

Which strait connects Red Sea and Indian Ocean?

a) Malacca

b) Bosphorus

c) Bab-el-Mandeb

d) Hormuz

Question : 6

What is the most abundant component of salts in sea ?

a) Potassium

b) Chlorine

c) Calcium

d) Sodium