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CBSE Class 9 Oceans and Life — practice questions — page 3

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 61–90 of 98.

What is the main cause of ocean waves?Read the answer and worked solution →The horizontal distance between two consecutive wave crests is theRead the answer and worked solution →The time needed for a wave crest to travel from one point to the next is the wave'sRead the answer and worked solution →Why are waves often called coastal architects?Read the answer and worked solution →Which order correctly shows wave erosion landforms on a headland?Read the answer and worked solution →What is the erosion caused by the force of moving water loosening rock called?Read the answer and worked solution →Which coastal feature is formed by wave deposition?Read the answer and worked solution →Giant waves mainly caused by underwater earthquakes are calledRead the answer and worked solution →The maximum height a tsunami reaches above sea level on land is itsRead the answer and worked solution →The rise of ocean water to its highest level at the shore is calledRead the answer and worked solution →Another name for low tide isRead the answer and worked solution →Spring tides occur when the Sun, Earth and Moon areRead the answer and worked solution →Neap tides occur when the Moon is in which phases?Read the answer and worked solution →Compared with spring tides, the gap between high and low water in neap tides isRead the answer and worked solution →Which Indian gulf has one of the highest tidal ranges, about 12 metres?Read the answer and worked solution →Why do large ships in shallow channels like the Singapore Strait often wait for high tide?Read the answer and worked solution →Why do fishing communities often get a better catch during high tide?Read the answer and worked solution →Continuous streams of water flowing in set directions across the ocean surface areRead the answer and worked solution →Which effect of Earth's rotation influences the direction of ocean currents?Read the answer and worked solution →On maps, warm and cold currents are usually shown in which colours?Read the answer and worked solution →The warm Gulf Stream flows from the Gulf of Mexico towardsRead the answer and worked solution →The cold Labrador Current flows along the east coast ofRead the answer and worked solution →Why are regions where warm and cold currents meet good fishing grounds?Read the answer and worked solution →Which Indian agency, with IMD, set up the Storm Surge Early Warning System?Read the answer and worked solution →What is the GEMINI device meant for?Read the answer and worked solution →GEMINI passes satellite information to fishermen's phones throughRead the answer and worked solution →Cyclones in the North Indian Ocean are named from a list given by how many member countries?Read the answer and worked solution →On what date did the Indian Ocean tsunami strike?Read the answer and worked solution →Which island was largely spared in the 2004 tsunami thanks partly to local folklore?Read the answer and worked solution →Which centre sends tsunami alerts to the Government of India?Read the answer and worked solution →

Worked practice questions

What is the main cause of ocean waves?

  1. Winds blowing across the water
  2. Gravity of nearby planets
  3. Melting of polar ice caps
  4. Salt in the sea water
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Correct answer: A. Winds blowing across the water

Waves form when wind blows over the water surface and passes energy to it.

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The horizontal distance between two consecutive wave crests is the

  1. wave period
  2. wave height
  3. wavelength
  4. wave speed
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Correct answer: C. wavelength

Wavelength is measured between two crests or two troughs that follow each other.

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The time needed for a wave crest to travel from one point to the next is the wave's

  1. period
  2. height
  3. wavelength
  4. frequency
Show answer and solution

Correct answer: A. period

Wave period is the time a crest takes to cover the distance between two points, while frequency counts crests per second.

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