Class 8 Science Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet — practice questions with answers
Free practice for Class 8 Science, Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet. Try the solved questions below, then take a free test with instant marking and explanations.
45 questions14 easy, 23 medium, 8 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. Why doesn’t the air around Earth fly off into space?
- Earth’s gravity holds the atmosphere
- Air is too heavy
- Clouds trap it
- The Moon pulls it back
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Answer: A. Earth’s gravity holds the atmosphere
Why: Earth is the right size to support an atmosphere. [p.212, p.216]
Why: Earth is the right size to support an atmosphere. [p.212, p.216]
Q2. Which planets are small and rocky? (Tick all that apply)
- Mercury
- Venus
- Mars
- Jupiter
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Answer: A. Mercury; B. Venus; C. Mars
Why: Jupiter, Saturn, Uranus and Neptune are large gas planets; Earth is rocky too. [p.213]
Why: Jupiter, Saturn, Uranus and Neptune are large gas planets; Earth is rocky too. [p.213]
Q3. The trapping of heat by gases like carbon dioxide in a planet’s atmosphere is called the ______ effect.
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Answer: greenhouse
Why: It keeps Earth at the right temperature. [p.214]
Why: It keeps Earth at the right temperature. [p.214]
Q4. The layer of the atmosphere made of three-atom oxygen molecules that blocks harmful UV rays is the ______ layer.
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Answer: ozone
Why: UV rays can damage living cells. [p.218]
Why: UV rays can damage living cells. [p.218]
Q5. Which is an example of geodiversity?
- Different landforms like mountains, valleys and deserts
- Variety of bird chirping
- Changing monsoon weather
- Number of fish types
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Answer: A. Different landforms like mountains, valleys and deserts
Why: Exercise 2 of the chapter. [p.226]
Why: Exercise 2 of the chapter. [p.226]
Q6. Which are harmful effects of air pollution? (Tick all that apply)
- Breathing problems
- Damage to crops
- Smog and acid rain
- Cleaner water
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Answer: A. Breathing problems; B. Damage to crops; C. Smog and acid rain
Why: Fig. 13.15. [p.224]
Why: Fig. 13.15. [p.224]
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Frequently asked questions
How many practice questions are there for Class 8 Science Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet?
45 questions (14 easy, 23 medium, 8 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 8 Science syllabus, used by CBSE and many state boards.