7th std

  Greywater Recycling System  Water scarcity is becoming a serious issue in many parts of the world. Every day, large amounts of usable water go down the drain from bathrooms, sinks, and washing machines. A Greywater Recycling System helps reuse this water safely instead of wasting it. This project is practical, eco-friendly, and highly suitable for science exhibitions from Class 6th to 10th.  Introduction Greywater is the wastewater that comes from: Bathroom sinks Showers Washing machines Kitchen sinks (without heavy oil waste) It does not include toilet water (that is called blackwater). A greywater recycling system collects, filters, and reuses this water for purposes like gardening, flushing toilets, and cleaning. Aim of the Project To design a working model that demonstrates how used household water can be filtered and reused safely.  Why Greywater Recycling is Important Countries like India face water shortages in many regions. Recycling greywat...

  Earthquake-Resistant Building Model Earthquakes are natural disasters that can cause severe damage to buildings and infrastructure. Many lives are lost not because of the earthquake itself, but due to building collapse. An  Earthquake-Resistant Building Model  helps students understand how structures can be designed to withstand seismic force.  Introduction An earthquake occurs due to sudden movement of tectonic plates beneath the Earth's surface. The vibrations produced are called seismic waves. Countries like  India  and  Japan  experience earthquakes in several regions. Therefore, engineers design buildings that can resist shaking and reduce damage.  Aim of the Project To demonstrate how special structural techniques can make buildings more resistant to earthquake vibrations.  What is an Earthquake-Resistant Building? An earthquake-resistant building is designed to: Absorb shock waves Reduce vibration impact ...