Question

mcq on oceanography class7 ​

Answer 1

Explanation:

Question 3.

Which one of the following is an artificial enclosure for keeping small house plants?

(a) Terrarium

(b) Thermosphere

(c) Climate

(d) Evaporation

Answer

Question 4.

Sea water contains

(a) 97.3% of salt

(b) 2% of salt

(c) 0.68% of salt

(d) 0.973% of salt

Answer

Question 5.

Which day of the year is celebrated as Water Day?

(a) 26 January

(b) 15 January

(c) 15 August

(d) 22 March

Answer

Question 6.

The movements that occur in oceans can be broadly called

(a) wave

(b) circulation

(c) water cycle

(d) all of these

Answer

Question 7.

Which is the Japanese word which means ‘Harbour Waves’?

(a) Tsunami

(b) Sea wave

(c) Ocean wave

(d) None of these

Answer

Question 8.

When did Tsunami strike the Indian ocean?

(a) 26 December, 2004

(6) 26 December, 2005

(c) 26 December, 2006

(d) 26 December, 2007

Answer

Question 9.

The largest Tsunami wave travels at the speed of

(a) more than 700 km per hour

(b) more than 500 km per hour

(c) more than 250 km per hour

(d) more than 100 km per hour

Answer

Question 10.

The rhythmic rise and fall of ocean water twice in a day is known as

(a) tide

(b) wave

(c) ocean current

(d) none of these

Answer 2

Answer:

Oceanography is the study of the physical, chemical, and biological features of the ocean, including the ocean's ancient history, its current condition, and its future. ... Indeed, one of the most critical branches of oceanography today is known as biological oceanography.

Explanation:

typically divided into four sub-disciplines: physical oceanography (the study of waves, currents, tides and ocean energy); geological oceanography (the study of the sediments, rocks and structure of the seafloor and coastal margins); chemical oceanography (the study of the composition and properties of seawater

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