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animate-books

NCERT Curiosity Textbook of Science for Grade 8th

by Madhurima
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  • Q1
    Why is Chapter 2 titled “The Invisible Living World”?
    A1

    It refers to microorganisms (bacteria, viruses, fungi) not visible to naked eye but impacting health, decomposition, and nutrient cycles significantly.

  • Q2
    How does Chapter 3 define health beyond being disease-free?
    A2

    Health is complete physical, mental, and social well-being. It requires balanced diet, hygiene, exercise, and stress-free environment.

  • Q3
    Differentiate between contact and non-contact forces from Chapter 5.
    A3

    Contact forces require physical touch (friction, muscular). Non-contact forces act from distance (magnetic, gravitational, electrostatic).

  • Q4
    Why does atmospheric pressure decrease at higher altitudes (Chapter 6)?
    A4

    Air column height decreases, so fewer air particles exert less weight. This causes lower pressure and affects breathing.

  • Q5
    What is the key difference between elements and compounds (Chapter 8)?
    A5

    Elements contain one type of atom (e.g., iron). Compounds contain two or more elements chemically bonded (e.g., water – H₂O).

  • Q6
    How does a convex lens form a real image (Chapter 10)?
    A6

    When parallel light rays pass through a convex lens, they converge at the focal point. A real inverted image forms.

  • Q7
    Explain one example of nature working in harmony from Chapter 12.
    A7

    Bees pollinate flowers while collecting nectar. Plants get reproduced; bees get food. This mutualism maintains ecological balance.

  • Q8
    How do storms and cyclones form (Chapter 6)?
    A8

    Warm moist air over oceans rises, creating low pressure. Surrounding high-pressure air rushes in, causing spiraling winds and cyclonic circulation.

  • Q9
    What is the difference between solute and solvent in a solution (Chapter 9)?
    A9

    Solute is the substance dissolved (e.g., sugar). Solvent is the dissolving medium (e.g., water). Together they form a solution.

  • Q10
    How does the particulate nature of matter explain evaporation (Chapter 7)?
    A10

    Particles at liquid surface gain kinetic energy, overcome intermolecular forces, and escape as gas – even below boiling point.

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Have Doubts Regarding This Product ? Ask Your Question

  • Q1
    Why is Chapter 2 titled “The Invisible Living World”?
    A1

    It refers to microorganisms (bacteria, viruses, fungi) not visible to naked eye but impacting health, decomposition, and nutrient cycles significantly.

  • Q2
    How does Chapter 3 define health beyond being disease-free?
    A2

    Health is complete physical, mental, and social well-being. It requires balanced diet, hygiene, exercise, and stress-free environment.

  • Q3
    Differentiate between contact and non-contact forces from Chapter 5.
    A3

    Contact forces require physical touch (friction, muscular). Non-contact forces act from distance (magnetic, gravitational, electrostatic).

  • Q4
    Why does atmospheric pressure decrease at higher altitudes (Chapter 6)?
    A4

    Air column height decreases, so fewer air particles exert less weight. This causes lower pressure and affects breathing.

  • Q5
    What is the key difference between elements and compounds (Chapter 8)?
    A5

    Elements contain one type of atom (e.g., iron). Compounds contain two or more elements chemically bonded (e.g., water – H₂O).

  • Q6
    How does a convex lens form a real image (Chapter 10)?
    A6

    When parallel light rays pass through a convex lens, they converge at the focal point. A real inverted image forms.

  • Q7
    Explain one example of nature working in harmony from Chapter 12.
    A7

    Bees pollinate flowers while collecting nectar. Plants get reproduced; bees get food. This mutualism maintains ecological balance.

  • Q8
    How do storms and cyclones form (Chapter 6)?
    A8

    Warm moist air over oceans rises, creating low pressure. Surrounding high-pressure air rushes in, causing spiraling winds and cyclonic circulation.

  • Q9
    What is the difference between solute and solvent in a solution (Chapter 9)?
    A9

    Solute is the substance dissolved (e.g., sugar). Solvent is the dissolving medium (e.g., water). Together they form a solution.

  • Q10
    How does the particulate nature of matter explain evaporation (Chapter 7)?
    A10

    Particles at liquid surface gain kinetic energy, overcome intermolecular forces, and escape as gas – even below boiling point.

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