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CBSE Class 3 · Science

Water — A Precious Gift

Official NCERT chapter from Our Wondrous World (book code ceev1). ExamMaster notes are original teaching at CBSE Class 3 depth.

This lesson follows the official chapter “Water — A Precious Gift” in Our Wondrous World. The words below are ExamMaster’s teaching, not a paste from the book. Use the NCERT chapter for the classroom sequence; use these notes to hold the idea without copying exercises or figures.

  • CBSE Class 3
  • Easy level
  • 8 concepts

1Water is a gift we use up if we waste it

The water you let run unused is water someone cannot drink or cook with later. Waste is use with no job.

Calling water “precious” without a waste-test is only a word.

Figure. Waste is water leaving with no job. The left tap runs into a drain; nobody drinks or cooks with it. The right tap fills a glass — same opening, a job. Calling water precious is empty until you can point at a leaving that does no work.

How it works

  1. Name a water jobDrink, cook, wash.
  2. See water leaving with no jobThat is waste.
  3. Stop that leavingKeep it for a job.

2A tap left open is a leak you can measure

An open tap fills a mug in a counted time. That count is a measure of the leak, not a scolding.

You can compare two leaks by how fast the mug fills.

Figure. An open tap is a leak you can measure. Put the same mug under each tap and count minutes to fill. The 2-minute tap wastes twice the water per minute of the 4-minute tap. The bar is the rate, not the scolding.

How it works

  1. Put a mug under the tapOne unit.
  2. Count how long it takes to fillA measure.
  3. A faster fill is a bigger leakCompare those times.

Mug under a drip

A drip fills a 1-cup mug in 4 minutes. A second tap fills it in 2 minutes. Which leak is larger?

  • Same mug1 cup
  • First tap4 minutes
  • Second tap2 minutes
  • Larger leakThe 2-minute tap

Pro tip. Same unit, shorter time means more water wasted per minute.

3Clean water and dirty water fail different jobs

Drinking needs cleaner water than mopping. Dirty water can fail the drink job and still do a mop job.

One word “water” does not name the job.

Figure. Drinking needs cleaner water than mopping. Dirty water can still wash a floor and still fail a drink. Name the job first, then ask whether this water is fit. The dashed arrow is the miss: mop water into a glass.

How it works

  1. Name the jobDrink, or mop.
  2. Ask if this water is fitClean enough?
  3. Do not drink mop waterWrong job.

4A property you can test: flows, wets, takes a shape

Water flows, wets a cloth, and takes the shape of the cup. Those are tests, not a poem.

A stone fails flow and wet-the-cloth in the same way.

Figure. Three tests, not a poem: water flows when you tilt it, wets a cloth, and takes the cup’s shape. The tall cup and the wide cup hold the same amount — equal area on the page — so the shape changed and the water did not vanish. A stone fails flow and wet.

How it works

  1. Tilt a little waterDoes it flow?
  2. Touch a clothDoes it wet?
  3. Pour into a new cupNew shape, same amount if no spill.

5Saving water is using less for the same job

A mug to wet a toothbrush can do the same clean-teeth job as a running tap, with less water. Same job, smaller use.

Skipping the job (dirty teeth) is not this saving.

Figure. Saving water is using less for the same job. A mug can wet a toothbrush and still finish clean teeth; a running tap does that job with a much larger leaving. Skipping the job — dirty teeth — is not this saving.

How it works

  1. Name the jobClean teeth, or wash a plate.
  2. Find a smaller use that still finishes the jobMug, not open tap.
  3. That smaller use is savingJob still done.

6A river and a bottle share the material, not the object

Both hold water, the material. The river is not a bottle. Object and material stay two words.

“I drank a river” mixes object and material.

Figure. A river and a bottle share the material water. They are not the same object. “I drank a river” mixes those two words. Name the material, then name the object that holds it.

How it works

  1. Name the materialWater.
  2. Name the objectBottle, or river-body.
  3. Keep them apartSame material, different object.

7One kitchen case: washing, drinking, cooking

Three kitchen jobs, three uses. Measure or watch one job honestly. You do not need a city’s rivers.

A kitchen case that names all three jobs is enough.

Figure. Three kitchen jobs are enough: washing, drinking, cooking. You do not need a city’s rivers to see water used. Pick one job, watch how much runs, and ask whether any left with no job.

How it works

  1. Pick one kitchen jobWashing a plate.
  2. See the water usedHow much, roughly.
  3. Ask if any ran unusedWaste in that job.

8A miss: calling any liquid “water” without a test

Oil and water can both look like a clear puddle in a bad photo. Flow-and-wet is not enough if you have oil. Do not drink an untested liquid.

The word water is earned by the job and a known source, not by being wet.

Figure. Wet and clear is not a test for the word water. Oil can look like a puddle in a bad photo. Ask the source: a tap meant for drink earns the word. An untested liquid does not. Flow-and-wet alone is not enough.

How it works

  1. Ask the sourceTap meant for drink?
  2. If unknown, do not drinkA miss to call it water.
  3. Use drink-water for drink jobsKnown clean source.
Saving water means
  1. Less water for the same finished job
  2. Skipping the job
  3. Leaving the tap open

Same job, smaller use.

Notes

  • Mapped to the official NCERT chapter “Water — A Precious Gift”. Original teaching only — no textbook sentences.
  • Science here is Physics, Chemistry and Biology ideas at this class, never a language or social-science chapter.

Recap

Hold these pegs from the official chapter “Water — A Precious Gift”. The wording is ExamMaster’s teaching, not a textbook recap.

Water is a gift we use up if we waste it
The water you let run unused is water someone cannot drink or cook with later.
A tap left open is a leak you can measure
An open tap fills a mug in a counted time.
Clean water and dirty water fail different jobs
Drinking needs cleaner water than mopping.
A property you can test: flows, wets, takes a shape
Water flows, wets a cloth, and takes the shape of the cup.
Saving water is using less for the same job
A mug to wet a toothbrush can do the same clean-teeth job as a running tap, with less water.
A river and a bottle share the material, not the object
Both hold water, the material. The river is not a bottle. Object and material stay two words.

Practise Water — A Precious Gift

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