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Exercise Question Answers-Chapter 3- The Dynamic Atmosphere and Changing Climate- Class 9-Social Science

  Important Question Answers for the Class 9-Social Science Chapter 3- The Dynamic Atmosphere and Changing Climate ***************************** Very Short Answer Type Questions: 1. Which layer of the atmosphere contains the ozone layer? Answer:   The stratosphere contains the ozone layer. 2. Name the gas that makes up the highest percentage of the atmosphere. Answer:   Nitrogen makes up the highest percentage of the atmosphere. 3. Which element of weather is measured using a barometer? Answer:   A barometer is used to measure atmospheric pressure . 4. What is the normal duration of the southwest monsoon in India? Answer:   The southwest monsoon usually lasts from June to September . 5. Which season in India is known as the “hot weather season”? Answer:   The summer season is known as the hot weather season. 6. Name the process by which water vapour turns into clouds. Answer:   The process is called condensation . 7....
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MCQs-Chapter 1-The Ever-Evolving World of Science-Class 7-Science

 Multiple Choice Questions-Chapter 1-The Ever-Evolving World of Science

******************************

📚  Multiple Choice Questions (MCQs)

  1. Science is best described as:

    • (a) Memorizing facts

    • (b) Performing experiments

    • (c) A way of thinking and discovery

    • (d) Reading textbooks

    • Answer: (c)

  2. What inspired early explorations of flight?

    • (a) Birds

    • (b) Paper planes

    • (c) Clouds

    • (d) Rockets

    • Answer: (b)

  3. Which process involves heat making changes faster?

    • (a) Freezing

    • (b) Evaporation

    • (c) Condensation

    • (d) Melting

    • Answer: (d)

  4. Materials are classified based on:

    • (a) Color

    • (b) Properties

    • (c) Size

    • (d) Shape

    • Answer: (b)

  5. What flows underground after rainfall?

    • (a) Air

    • (b) Lava

    • (c) Water

    • (d) Light

    • Answer: (c)

  6. What helps circulate nutrients in the body?

    • (a) Blood

    • (b) Air

    • (c) Bones

    • (d) Muscles

    • Answer: (a)

  7. Plants prepare their own food by:

    • (a) Eating other plants

    • (b) Photosynthesis

    • (c) Respiration

    • (d) Digestion

    • Answer: (b)

  8. Early humans measured time by:

    • (a) Clocks

    • (b) Watching shadows

    • (c) Counting stars

    • (d) Using sand timers

    • Answer: (b)

  9. A torch battery that runs out is an example of:

    • (a) Reversible change

    • (b) Irreversible change

    • (c) No change

    • (d) Physical change

    • Answer: (b)

  10. What phenomenon causes eclipses?

    • (a) Rotation of Earth

    • (b) Shadows of celestial bodies

    • (c) Falling stars

    • (d) Ocean tides

    • Answer: (b)

  11. Which state of water falls from clouds?

    • (a) Gas

    • (b) Liquid

    • (c) Solid

    • (d) Plasma

    • Answer: (b)

  12. Curiosity is most important for:

    • (a) Memorizing

    • (b) Questioning

    • (c) Forgetting

    • (d) Sleeping

    • Answer: (b)

  13. What process turns water into vapor?

    • (a) Melting

    • (b) Evaporation

    • (c) Freezing

    • (d) Boiling

    • Answer: (b)

  14. Our body’s growth in middle school is due to:

    • (a) Bones stretching

    • (b) Life processes

    • (c) Exercise

    • (d) Jumping

    • Answer: (b)

  15. What allows humans to read books at night?

    • (a) Fire

    • (b) Artificial light

    • (c) Shadows

    • (d) Reflected sunlight

    • Answer: (b)

  16. Changes that cannot be reversed include:

    • (a) Melting of ice

    • (b) Breaking a rock into pebbles

    • (c) Dissolving salt

    • (d) Boiling water

    • Answer: (b)

  17. Metals are generally:

    • (a) Poor conductors

    • (b) Good conductors

    • (c) Non-conductors

    • (d) Transparent

    • Answer: (b)

  18. Non-metals are generally:

    • (a) Hard

    • (b) Good conductors

    • (c) Poor conductors

    • (d) Shiny

    • Answer: (c)

  19. Water cycle involves:

    • (a) Only evaporation

    • (b) Only condensation

    • (c) Evaporation and precipitation

    • (d) Freezing

    • Answer: (c)

  20. Light and shadows help us understand:

    • (a) Only colors

    • (b) Only brightness

    • (c) Nature of light

    • (d) Smells

    • Answer: (c)

  21. What happens when light is blocked?

    • (a) Reflection

    • (b) Shadow formation

    • (c) Refraction

    • (d) Vibration

    • Answer: (b)

  22. Paper planes were an early step toward understanding:

    • (a) Chemistry

    • (b) Mechanics

    • (c) Flight

    • (d) Magnetism

    • Answer: (c)

  23. Heat transfer by direct contact is:

    • (a) Radiation

    • (b) Convection

    • (c) Conduction

    • (d) Insulation

    • Answer: (c)

  24. Which natural force causes day and night?

    • (a) Earth’s rotation

    • (b) Moon’s revolution

    • (c) Earthquake

    • (d) Wind

    • Answer: (a)

  25. Evaporation causes:

    • (a) Water cooling

    • (b) Water heating

    • (c) Water solidifying

    • (d) Water vanishing without a trace

    • Answer: (a)

✅ 5 True/False

  1. Science is only about memorizing facts. (False)

  2. Photosynthesis occurs in plants. (True)

  3. Metals are poor conductors of electricity. (False)

  4. Water vapor condenses to form clouds. (True)

  5. Light and shadows have no role in space phenomena. (False)

✏️ 5 Fill in the Blanks

  1. Paper planes inspired scientific explorations of __________.
    Answer: flight

  2. Early humans used __________ to measure time.
    Answer: shadows

  3. __________ is the process where water changes into vapor.
    Answer: Evaporation

  4. Plants make their food through __________.
    Answer: photosynthesis

  5. __________ conduct electricity well.
    Answer: Metals

❓ 5 Assertion-Reason Questions

  1. Assertion: Water evaporates faster when heated.
    Reason: Heat gives energy to water molecules to escape into air.

    • Answer: (a)

  2. Assertion: Metals are non-conductors of electricity.
    Reason: Metals are hard substances.

    • Answer: (c)

  3. Assertion: A melting ice cube is an irreversible change.
    Reason: The process cannot be undone.

    • Answer: (d)

  4. Assertion: Light is essential for seeing objects.
    Reason: Light reflects from objects into our eyes.

    • Answer: (a)

  5. Assertion: Our body stops growing after primary school.
    Reason: Life processes stop working after childhood.

    • Answer: (d)

🔗 5 Match the Following:

   

          Column A

          Column B

1.     Paper plane

          A.     Inspired flight studies

2.     Photosynthesis 

          B.     Food production in plants

3.     Water cycle

          C.     Evaporation and precipitation

4.     Rotation of Earth

          D.     Causes day and night

5.     Metals

          E.     Good conductors of electricity

 Answer: 1-A, 2-B, 3-C, 4-D, 5-E

*******************************************************

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  1. Anonymous28 June 2025 at 07:24

    Good
    Very good

    ReplyDelete
    Replies
    1. Anonymous29 July 2025 at 20:04

      Very nice 🙂🙂
      It's amazing 🤩🤩
      It's too helpful tommorow is my science exam and i was not prepared but now I am prepared 👍✅✅🙏🏻🙏🏻🙏🏻🙏🏻

      Delete
    2. Anonymous30 August 2025 at 06:35

      Thanks

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    3. Anonymous30 August 2025 at 06:35

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  2. Anonymous6 July 2025 at 20:05

    Good 👍 I am coming

    ReplyDelete
  3. Anonymous30 August 2025 at 06:35

    Hi

    ReplyDelete
  4. Anonymous30 May 2026 at 07:33

    100 MCQ beta

    ReplyDelete
  5. Anonymous30 May 2026 at 07:34

    Good morning

    ReplyDelete
  6. Anonymous6 June 2026 at 12:46

    thank you

    ReplyDelete
  7. Anonymous15 June 2026 at 00:16

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