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Olympiad (Class 5) Natural Environment — practice questions

Explore 46 free Natural Environment questions in Olympiad (Class 5) General Knowledge. Open each question or exercise to read its content, reference answers and available explanation.

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Natural Environment questions and exercises with answers

Showing questions 1–30 of 46.

Clouds, rain and storms mostly form in which layer of the atmosphere?Read the answer and worked solution →The ozone layer that shields us from harmful sunlight lies inside which layer?Read the answer and worked solution →Which gas makes up about 78 percent of the dry air around us?Read the answer and worked solution →What is the main job of the ozone layer for living things?Read the answer and worked solution →What provides the energy that keeps the water cycle running?Read the answer and worked solution →A wet cloth dries on a clothesline in the sun. Which process turned its water into vapour?Read the answer and worked solution →Tiny drops of water vapour cool and gather to make clouds and fog. What is this change called?Read the answer and worked solution →Which of these counts as precipitation?Read the answer and worked solution →A plastic bag tied over a leafy branch collects droplets inside. Plants giving out water vapour is called what?Read the answer and worked solution →About what share of Earth's surface is covered by ocean?Read the answer and worked solution →About how much of all the water on Earth is held in the ocean?Read the answer and worked solution →Seawater has a salinity of about 35 parts per thousand. How many grams of salt are in 1,000 grams of such seawater?Read the answer and worked solution →Scientists call the water part of Earth, such as oceans and lakes, by which name?Read the answer and worked solution →Which Earth sphere contains all the living things, such as plants and animals?Read the answer and worked solution →A geologist studying a granite cliff is mostly studying which sphere of Earth?Read the answer and worked solution →Which statement describes the climate of a place, not its weather?Read the answer and worked solution →Why is the stratosphere almost free of clouds and storms?Read the answer and worked solution →About how much of the mass of the whole atmosphere is found in the troposphere?Read the answer and worked solution →Which layer lies directly above the troposphere?Read the answer and worked solution →After nitrogen, which gas is the most plentiful in dry air?Read the answer and worked solution →Which of these gases in air is a greenhouse gas?Read the answer and worked solution →What is the main driving factor of the oxygen cycle?Read the answer and worked solution →Which one is a non-living (abiotic) part of a forest ecosystem?Read the answer and worked solution →What is a wilderness?Read the answer and worked solution →Which of these is an example of wildlife?Read the answer and worked solution →Which of these can be a source of the water in a river?Read the answer and worked solution →A body of standing water that is smaller than a lake is usually called what?Read the answer and worked solution →What mainly separates a stream from a pond?Read the answer and worked solution →After a shower, water soaks down into the soil of a garden. What is this movement called?Read the answer and worked solution →Rain that flows across the ground towards streams and rivers is called what?Read the answer and worked solution →

Worked practice questions

Clouds, rain and storms mostly form in which layer of the atmosphere?

  1. Exosphere
  2. Stratosphere
  3. Mesosphere
  4. Troposphere
Show answer and solution

Correct answer: D. Troposphere

Nearly all the moisture in the air sits in the lowest layer, so clouds and rain form there.

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The ozone layer that shields us from harmful sunlight lies inside which layer?

  1. Thermosphere
  2. Mesosphere
  3. Troposphere
  4. Stratosphere
Show answer and solution

Correct answer: D. Stratosphere

Ozone is concentrated in the second-lowest layer of air, above the weather layer.

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Which gas makes up about 78 percent of the dry air around us?

  1. Nitrogen
  2. Oxygen
  3. Hydrogen
  4. Helium
Show answer and solution

Correct answer: A. Nitrogen

Dry air is mostly nitrogen, with oxygen forming about 21 percent.

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