plsss!!!!!! suggest me a working model on any topic of physics for class xi bt a gud one.

To make a working model you will need to be clear with what is being taught in the subject. Once you do that, look at the real life applications of what you have been taught in the same. Using that you will easily be able to make a working model based on application of the concepts taught.
Feel free to ask wherever you have any doubts.

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Physics / Electronics Projects with Reports
	Burglar Alarm Rain Alarm / water Level Indicator Fire Alarm Light Activated Alarm / Day Alarm Electronic Eye / Night Alarm Magnet Detector Clap Switch / Sound Operated Switch Intercom Electromagnetism Dsncing Lights Automatic Night Light Torch Light Electric Bell Single tune Musical Bell Light dimmer Grip Testing Game Dynamo Electromagnet Windmill Generator (Small) Windmill Generator (Big) Water Turbine Solar Cooker Solar Light Solar Bell Solar Photovoltaic Modules for Education Home Wiring Demonstration Type Transformer Demonstration Type Meter Automobile Flasher / Direction Indicator Resistance In Series & Parallel Kirchoffs Law Wheatstone Bridge Logic Gate (any one: And / OR / NAND / NOR Logic Gate (Having all five gates) Magnetic Door Alarm Simple Half Wave Rectifier Power Supply 5V/12V Regulated Power Supply Full Wave Rectifier Power Supply Electrical Conductor Model Time Switch Electronic Letter Box Thermocouple (heat energy to electrical energy) Telescope Periscope Electronic Organ Noise Pollution Checker Water Pollution Checker Metal Detector Traffic Lights Optical Fibre Switch Loudspeaker (Microphone Amplifier Six LED Water Level Indicator Emergency Light Cum Charger Electric Shock Game Two Bulbs in Series Circuit Two Bulbs in Parallel Circuit Morse Single (2 way) Transformer Experiments NPN Transistor Amplifier PNP Transistor Amplifier LDR Working Audio Osclliator Soil Moisture Indicator 3D-In-One Electronics Kit For Students