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Our School—A Happy Place - Green School: Waste, Water, and Energy

Grade 5CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Definition of a Green School: A school that prioritizes environmental sustainability by managing waste, conserving water, and using energy efficiently.

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Waste Management (The 3Rs): The principle of 'Reduce' (using less), 'Reuse' (using items again), and 'Recycle' (processing waste into new products).

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Biodegradable vs. Non-biodegradable Waste: Biodegradable waste (like food scraps) decomposes naturally, while non-biodegradable waste (like plastics) does not.

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Composting: The process of converting organic waste into nutrient-rich manure using microbes or earthworms (Vermicomposting).

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Water Conservation: Techniques like 'Rainwater Harvesting' (collecting rain from rooftops) and fixing leaks to prevent wastage.

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Energy Conservation: Reducing electricity consumption by switching off lights/fans when not in use and using renewable sources like Solar EnergySolar\ Energy.

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Energy Efficiency: Using devices like LEDLED (Light Emitting Diode) bulbs that consume less power compared to traditional incandescent bulbs.

📐Formulae

Total Waste=Biodegradable Waste+Non-biodegradable Waste\text{Total Waste} = \text{Biodegradable Waste} + \text{Non-biodegradable Waste}

Percentage of Recyclable Waste=(Weight of Recyclable WasteTotal Weight of Waste)×100\text{Percentage of Recyclable Waste} = \left( \frac{\text{Weight of Recyclable Waste}}{\text{Total Weight of Waste}} \right) \times 100

Water Saved=Previous Water Usage−Current Water Usage\text{Water Saved} = \text{Previous Water Usage} - \text{Current Water Usage}

Energy Saved (units)=Power of Old Device (W)−Power of New Device (W)\text{Energy Saved (units)} = \text{Power of Old Device (W)} - \text{Power of New Device (W)}

💡Examples

Problem 1:

A school generated 4500 kg4500\ kg of total waste in a month. If 2750 kg2750\ kg was biodegradable waste, calculate the amount of non-biodegradable waste using vertical subtraction.

Solution:

4500−27501750\begin{array}{r} 4500 \\ - 2750 \\ \hline 1750 \end{array}

Explanation:

To find the non-biodegradable waste, we subtract the biodegradable waste from the total waste: 4500 kg−2750 kg=1750 kg4500\ kg - 2750\ kg = 1750\ kg.

Problem 2:

If a school's rainwater harvesting tank collects 1200 litres1200\ litres in the first rain and 850 litres850\ litres in the second rain, what is the total water collected?

Solution:

1200+8502050\begin{array}{r} 1200 \\ + 850 \\ \hline 2050 \end{array}

Explanation:

The total volume of water collected is the sum of the water collected in both sessions: 1200+850=2050 litres1200 + 850 = 2050\ litres.

Problem 3:

Calculate the percentage of waste recycled if 20 kg20\ kg of paper was recycled out of a total of 100 kg100\ kg of school waste.

Solution:

Recycled Percentage=20100×100=20%\text{Recycled Percentage} = \frac{20}{100} \times 100 = 20\%

Explanation:

The percentage is calculated by dividing the recycled amount by the total amount and multiplying by 100100.