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National Winning Science Fair Projects for Class 9

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Science Fair Resources

National Winning Science Fair Projects for Class 9

Discover 100 curated project ideas across 10 subject streams. Each idea is designed to help students win at school, district, and national science fairs.

📋 100 Projects
🏆 Competition Ready
📚 10 Streams

Physics

10 Projects

# Project Idea Explore
1 Study how wire length and diameter affect electrical resistance View →
2 Investigate the factors affecting the strength of an electromagnet View →
3 Measure and compare the gravitational acceleration using a simple pendulum View →
4 Study the relationship between angle of incidence and refraction in water View →
5 Investigate the relationship between string tension and frequency of vibration View →
6 Study how temperature affects the electrical resistance of a resistor View →
7 Demonstrate conservation of momentum using marbles on a ruler View →
8 Investigate how the shape of a magnet affects its magnetic field pattern View →
9 Measure the speed of sound using clapping and echo timing method View →
10 Study how load placement affects the deflection of a beam View →

Also Read : National Winning Science Fair Projects Class 11

Chemistry

10 Projects

# Project Idea Explore
1 Study the effect of temperature on the solubility of potassium nitrate View →
2 Investigate the effect of catalyst (MnO2) on decomposition rate of H2O2 View →
3 Study displacement reactions by ranking metals in an activity series View →
4 Investigate how concentration affects rate of reaction in a colour-change reaction View →
5 Study the preparation and properties of carbon dioxide gas View →
6 Investigate the effect of pH on the activity of amylase enzyme View →
7 Study the colligative properties of solutions (boiling point elevation) View →
8 Investigate the rusting process and effectiveness of various protective coatings View →
9 Study the reaction between different acids and a common base (titration) View →
10 Investigate the chemical changes during combustion of different fuels View →

Biology

10 Projects

# Project Idea Explore
1 Study the effect of light intensity on oxygen production in Elodea View →
2 Investigate the effect of exercise on pulse rate and recovery time View →
3 Study osmosis in plant cells using potato cylinders and sucrose solutions View →
4 Investigate the role of saliva in starch digestion using iodine test View →
5 Study the growth of bacteria on different agar media types View →
6 Investigate the effect of temperature on the germination rate of seeds View →
7 Study the transpiration rate under different humidity conditions View →
8 Investigate the antibacterial properties of plant extracts from neem and turmeric View →
9 Study the role of auxins in plant phototropism using controlled light setup View →
10 Investigate the effect of soil pH on the growth of bean plants View →

Environmental Science

10 Projects

# Project Idea Explore
1 Test water quality of local ponds using chemical and biological indicators View →
2 Study the effect of air pollution on stomatal pore size of leaves View →
3 Investigate the greenhouse effect using glass jars and a lamp View →
4 Study the biodegradability of different types of plastic polymers View →
5 Investigate the effectiveness of biochar in improving sandy soil fertility View →
6 Study the eutrophication process and its effect on aquatic life View →
7 Investigate how urbanization affects local insect diversity View →
8 Study the lifecycle assessment of a single-use plastic bottle View →
9 Investigate the effect of microplastics on seed germination View →
10 Study the efficiency of different composting methods View →

Technology & Computers

10 Projects

# Project Idea Explore
1 Build an automatic plant watering system using soil moisture sensor and Arduino View →
2 Design and build a solar-powered USB charger View →
3 Build a low-cost seismograph using a pendulum and light sensor View →
4 Program a robot to follow a line and avoid obstacles View →
5 Build a model smart traffic light system using LDR and timer circuit View →
6 Design a home automation prototype using Raspberry Pi and sensors View →
7 Build a water level indicator with alarm using simple electronics View →
8 Design a simple weather station that logs temperature and humidity data View →
9 Build an ultrasonic distance measurement device using Arduino View →
10 Program a mobile app to monitor air quality using a sensor module View →

Mathematics & Statistics

10 Projects

# Project Idea Explore
1 Study how the golden ratio appears in architectural proportions View →
2 Investigate whether test scores follow a normal distribution in your class View →
3 Study the relationship between compound interest rate and wealth growth View →
4 Investigate prime number distribution patterns in arithmetic sequences View →
5 Study the geometry of honeycomb cells and efficiency of tessellations View →
6 Investigate how graph theory helps solve the shortest path problem View →
7 Study Euler’s formula for polyhedra using physical models View →
8 Investigate the mathematics of cryptographic substitution ciphers View →
9 Study fractal patterns and their dimension calculation View →
10 Investigate Bayes theorem through medical test accuracy problems View →

Physics Advanced

10 Projects

# Project Idea Explore
1 Study the photoelectric effect using different LEDs and a solar cell View →
2 Investigate thermal conductivity of different metals using heat flow rate View →
3 Study the Doppler effect using a sound source on a rotating arm View →
4 Investigate the resonance phenomenon in a string vibration experiment View →
5 Study the Bernoulli effect using paper strips and a hairdryer View →
6 Investigate how angle affects the efficiency of a solar panel View →
7 Study standing waves in an air column (Kundts tube experiment) View →
8 Investigate how the shape of fins affects the speed of a model rocket View →
9 Study the capacitance of a capacitor using a charging curve View →
10 Investigate the relationship between frequency and wavelength in waves View →

Chemistry Advanced

10 Projects

# Project Idea Explore
1 Synthesize aspirin and compare purity with commercial acetylsalicylic acid View →
2 Study the kinetics of the saponification reaction at different temperatures View →
3 Investigate the chemistry of food spoilage and role of preservatives View →
4 Study the electrochemistry of different electrode pairs in galvanic cells View →
5 Investigate the effect of salt bridge material on galvanic cell potential View →
6 Study the preparation of an indicator dye from plant extracts View →
7 Investigate the chemistry of natural vs synthetic perfumes View →
8 Study the chemical composition of different types of soil View →
9 Investigate the chemistry of photographic development using silver halides View →
10 Study the effect of metal ions on the color of flames View →

Biology Advanced

10 Projects

# Project Idea Explore
1 Study the genetic basis of stem color variation in a plant model View →
2 Investigate the competitive exclusion principle using paramecia cultures View →
3 Study the role of chromosomal crossover in genetic variation View →
4 Investigate the effect of heavy metals on root growth in Allium cepa View →
5 Study bioaccumulation of a pollutant in an aquatic food chain model View →
6 Investigate the relationship between stomatal density and water availability View →
7 Study population growth curves using bacterial cultures in nutrient media View →
8 Investigate the role of phytochrome in photoperiodic plant behavior View →
9 Study the chemistry of ATP synthesis in chloroplasts (mechanistic model) View →
10 Investigate the role of nitrogen-fixing bacteria in soil fertility View →

Innovation & Design

10 Projects

# Project Idea Explore
1 Design a passive solar house model to minimize heating energy View →
2 Build a rainwater collection and purification system for a household View →
3 Design a low-cost prosthetic hand using recycled materials and springs View →
4 Build a device to generate electricity from footsteps using piezoelectric tiles View →
5 Design a solar-powered desalination model using a glass container View →
6 Build a braille printer prototype using stepper motors and Arduino View →
7 Design a smart shoe insole that monitors gait for injury prevention View →
8 Build a portable UV water sterilizer for fieldwork applications View →
9 Design a bio-inspired robot foot for walking on sandy terrain View →
10 Build a model of a vacuum tube radio from scratch View →

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