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CBSE Class 9 Oceans and Life — practice questions

Explore 98 free Oceans and Life questions in CBSE Class 9 Social Science. Open each question or exercise to read its content, reference answers and available explanation.

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Oceans and Life questions and exercises with answers

Showing questions 1–30 of 98.

Which force mainly drives surface ocean currents?Read the answer and worked solution →Which ocean current is the largest on Earth?Read the answer and worked solution →How are ocean currents classified by temperature?Read the answer and worked solution →In which direction do surface currents spiral in the Northern Hemisphere?Read the answer and worked solution →What is the ocean's conveyor belt also called?Read the answer and worked solution →Which two properties set seawater density for deep currents?Read the answer and worked solution →Which programme maps ocean temperature and salinity with drifting floats?Read the answer and worked solution →Which current makes northwest Europe milder than places at the same latitude?Read the answer and worked solution →How do warm currents raise nearby coastal temperatures?Read the answer and worked solution →About how many times a day do ocean tides rise and fall?Read the answer and worked solution →Which two bodies mainly cause ocean tides through gravity?Read the answer and worked solution →When do spring tides occur?Read the answer and worked solution →At which moon phases do neap tides occur?Read the answer and worked solution →What does the term semi-diurnal mean for tides?Read the answer and worked solution →Which instrument records sea level at fixed stations over time?Read the answer and worked solution →Which level are tide records compared against?Read the answer and worked solution →Which event raises sea level through strong winds and low air pressure?Read the answer and worked solution →Which natural event is a common cause of tsunami waves?Read the answer and worked solution →The word tsunami comes from which language?Read the answer and worked solution →Which ancient Greek historian linked tsunamis to submarine earthquakes?Read the answer and worked solution →Which country has the longest recorded history of tsunamis?Read the answer and worked solution →Why do tsunami waves look unlike ordinary sea waves?Read the answer and worked solution →Tsunamis are sometimes called what, though scientists dislike that name?Read the answer and worked solution →What is a seamount?Read the answer and worked solution →What were most seamounts originally formed from?Read the answer and worked solution →How high must a seamount rise above the surrounding seafloor?Read the answer and worked solution →In which ocean are seamounts and guyots most abundant?Read the answer and worked solution →Why do fish and plankton gather around seamounts?Read the answer and worked solution →The Emperor Seamounts are an extension of which island group?Read the answer and worked solution →What shape do oceanic trenches have in cross section?Read the answer and worked solution →

Worked practice questions

Which force mainly drives surface ocean currents?

  1. Winds blowing over the sea
  2. Earthquakes under the seabed
  3. Volcanic eruptions on islands
  4. Melting of polar glaciers
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Correct answer: A. Winds blowing over the sea

Prevailing winds push the upper layer of water, so surface currents follow the wind systems.

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Which ocean current is the largest on Earth?

  1. Equatorial Counter Current
  2. Antarctic Circumpolar Current
  3. North Atlantic Drift Current
  4. Peruvian Coastal Current
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Correct answer: B. Antarctic Circumpolar Current

It is wind driven, flows around Antarctica and connects all the oceanic basins together.

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How are ocean currents classified by temperature?

  1. Fast currents and slow currents
  2. Deep currents and surface currents
  3. Warm currents and cold currents
  4. Large currents and small currents
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Correct answer: C. Warm currents and cold currents

Currents that carry warmer water are called warm and those carrying colder water are called cold.

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