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Olympiad (Class 4) Our Environment — practice questions

Explore 50 free Our Environment questions in Olympiad (Class 4) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Our Environment questions and exercises with answers

Showing questions 1–30 of 50.

A mud hut made by people belongs to which kind of environment?Read the answer and worked solution →Which sphere of the Earth means all of its water?Read the answer and worked solution →The biosphere is the part of the Earth that is made of what?Read the answer and worked solution →The air around the Earth belongs to which sphere?Read the answer and worked solution →Which gas makes up the biggest part of dry air?Read the answer and worked solution →Out of every 100 parts of dry air, about how many parts are oxygen?Read the answer and worked solution →What does the ozone layer do for living things?Read the answer and worked solution →Why do nights on Earth not become extremely cold?Read the answer and worked solution →About how much of the Earth's surface is covered by ocean?Read the answer and worked solution →Ocean water is called saline water. What does saline mean?Read the answer and worked solution →A pond has fish, plants, water and sunlight working together. What is this whole unit called?Read the answer and worked solution →Which word means the living parts of an ecosystem?Read the answer and worked solution →Which one is a biotic part of a forest?Read the answer and worked solution →Which place is closest to being a wilderness?Read the answer and worked solution →Which one of these is wildlife?Read the answer and worked solution →Which of these energy sources is renewable and helps the environment?Read the answer and worked solution →Why does a bus help the environment more than many separate cars?Read the answer and worked solution →In the words Reduce, Reuse, Recycle, which step comes third?Read the answer and worked solution →Ravi keeps pencils in an old jam jar. Which R is this?Read the answer and worked solution →Mina carries a cloth bag so she needs fewer plastic bags. Which R is this?Read the answer and worked solution →A factory melts old metal cans to make new cans. What is this called?Read the answer and worked solution →Which pair of materials can both be recycled?Read the answer and worked solution →Which waste rots and goes back into the soil?Read the answer and worked solution →How does recycling help the Earth's resources?Read the answer and worked solution →Used office paper can be recycled into what?Read the answer and worked solution →Recycling helps lower the release of which warming gases?Read the answer and worked solution →When is water called polluted?Read the answer and worked solution →Oil leaks from a ship into the sea. What kind of pollution is this?Read the answer and worked solution →A factory pours hot water into a river. What may happen to the fish?Read the answer and worked solution →Rain washes farm fertilizer into a pond. What can this cause?Read the answer and worked solution →

Worked practice questions

A mud hut made by people belongs to which kind of environment?

  1. Natural environment
  2. Built environment
  3. Ocean environment
  4. Polar environment
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Correct answer: B. Built environment

A hut is made by people, so the place it changes counts as artificial, not natural.

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Which sphere of the Earth means all of its water?

  1. Lithosphere
  2. Atmosphere
  3. Biosphere
  4. Hydrosphere
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Correct answer: D. Hydrosphere

Hydro means water, and the hydrosphere is the water part of the Earth.

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The biosphere is the part of the Earth that is made of what?

  1. Living things
  2. Hard rocks
  3. Fresh water
  4. Clean air
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Correct answer: A. Living things

Bio means life, so the biosphere is the part of Earth where living things are found.

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How to practise

  1. Choose a Our Environment question and try to work out your answer.
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More Science topics

Force, work and energyFood and DigestionEarth and UniverseHuman NeedsAnimalsPlantsMatter and Materials