149+ Question Project Ideas 2025-26

Looking for project ideas that start with a question? Great — question-based projects make your work focused, testable, and easy to present.

Below you’ll find a clear explanation of what question project ideas are, the essential parts every project must include, tips for picking and doing a project, and 150 question-style project ideas grouped by subject. I’ve kept language simple so you can pick and start right away. Let’s go!

What is question project ideas?

A question project idea is a project topic written as a clear question you can answer through experiments, surveys, observation, coding, building, or research. Examples: “Does X affect Y?” or “How does A compare to B?”

Framing your project as a question helps you define the goal, design methods, and draw conclusions.

Must read: 150 Share Project Ideas — Practical, Easy-to-Start Ideas

Why choose question-based projects?

• Makes the aim clear and measurable.
• Guides you to make a hypothesis and test it.
• Easier to explain in reports and presentations.
• Works well for science fairs, school projects and portfolios.

Mandatory parts of every question-based project

1. Title — short, clear question.
2. Objective / Research Question — What exactly are you asking?
3. Background — Short explanation or facts that explain why the question matters.
4. Hypothesis — Your predicted answer.
5. Materials / Tools — What you’ll use.
6. Method / Procedure — Step-by-step plan to test the question.
7. Data / Observations — What you measured or recorded.
8. Results — Charts, tables, or summaries.
9. Conclusion — Answer the question and say whether the hypothesis was correct.
10. Limitations — What could have affected results.
11. Future work / Improvements — Ideas to extend the project.
12. References / Acknowledgements — Where you got info (no links if your teacher asked).

How to choose the right question for your project

• Pick something you’re curious about.
• Make sure it’s testable with your time, budget, and tools.
• Prefer questions you can measure (numbers, counts, times) or compare.
• Adjust scope: if it’s too big, narrow it down (e.g., “in my city” or “on these plants”).

How to present your project

• Title & question (big and clear)
• Short intro (why it matters)
• Hypothesis
• Materials & Method (bulleted)
• Results (table/graph + short text)
• Conclusion & next steps
• Visuals: photos, diagrams, small model or code demo

150 Question Project Ideas

A. Biology & Life Science

1. Does light color (red/blue/white) affect plant growth? — Grow seedlings under different colored LEDs and measure height.
2. Do different brands of soil affect seed germination rate? — Plant same seeds in different soils and record germination.
3. How does sugar affect yeast fermentation speed? — Measure CO₂ production with different sugar concentrations.
4. Does music affect the growth of common houseplants? — Play music types and compare growth.
5. How long do different fruits stay fresh at room temperature? — Observe and record spoilage stages.
6. Does salt concentration change bread mold growth rate? — Expose bread samples to salt solutions.
7. Which household disinfectant kills the most bacteria? — Swab surfaces, apply disinfectants, and observe cultures.
8. How does temperature affect worm activity? — Observe worm movement in different temps.
9. Do different types of fertilizer affect flower production? — Apply fertilizers and count blooms.
10. Does caffeine affect plant growth? — Water plants with caffeine solutions vs. water.
11. How do insects choose between two plant types? — Offer two plants and count insect visits.
12. Can seeds germinate without soil (hydroponics)? — Test germination in water / cotton vs. soil.
13. Do pets prefer wet or dry food when both are available? — Observe choice and amount eaten.
14. How does pH of water affect aquatic plant health? — Grow in different pH solutions and note condition.
15. Does color of fruit skin affect birds’ preference? — Use colored artificial fruit or painted food and observe.

B. Chemistry

16. Which antacid neutralizes acid fastest? — Measure pH change over time in acid solution.
17. Does temperature change the rate of a chemical reaction? — Use baking soda + vinegar at different temps and measure fizz rate.
18. How does salt affect boiling point of water? — Compare boiling behavior with and without salt.
19. Which natural substance best removes stains from fabric? — Test lemon, baking soda, vinegar, etc.
20. Does the size of a metal object affect how fast it rusts? — Expose different sizes to moisture and observe.
21. Which type of soap produces the most lather? — Compare bars/liquid soaps by foam volume.
22. Does the concentration of sugar change the freezing point of water? — Freeze sugar solutions and note differences.
23. Which fruit has the highest vitamin C content? — Use titration or compare with test strips.
24. How effective is charcoal at filtering colored water? — Pass colored water through charcoal and measure color reduction.
25. Does shaking affect the rate of emulsification (oil + water)? — Shake oil-water mixes and measure separation time.
26. Which drying agent removes moisture fastest from wet sand? — Use silica gel, salt, rice, etc.
27. How does pH affect the color of natural indicators (red cabbage)? — Make indicator and test acids/bases.
28. What is the effect of different catalysts on hydrogen peroxide breakdown? — Use yeast, manganese dioxide, etc., and measure oxygen release.
29. Does sugar type (white vs. brown vs. honey) affect yeast bread rise? — Bake or proof dough with different sugars.
30. How do detergents affect surface tension of water? — Measure droplet behavior or use floating pepper test.

C. Physics

31. How does surface area affect the rate of cooling? — Cool objects with different surface areas and log temperature drop.
32. Does the angle of a ramp change the speed of a rolling object? — Time a ball down ramps of different inclines.
33. How does mass affect pendulum period? — Build pendulums with different masses and measure period.
34. Which material is the best thermal insulator? — Wrap containers and measure heat loss.
35. How does sound volume change with distance in an open area? — Measure decibel levels at set distances.
36. Does the color of a surface change how much heat it absorbs from sunlight? — Measure temperature rise for different colors.
37. How does wire length affect electrical resistance? — Measure resistance of wires of different lengths.
38. Does altitude (height) affect the boiling point of water? — Simulate with pressure/altitude notes or compare at different places if possible.
39. How does the diameter of a string affect the frequency of waves? — Create waves and measure frequency differences.
40. How does the shape of a paper airplane affect flight distance? — Test designs and record distances.
41. Does the type of lubricant change friction in a sliding test? — Measure force required to pull objects on surfaces with different lubricants.
42. How does tension in a string affect wave speed? — Use a taut string and measure wave propagation speed.
43. Which type of spring gives the best energy storage? — Compare compression and extension under weights.
44. How does light intensity change through different materials? — Measure light after passing through glass, plastic, cloth.
45. Does humidity affect the bounce of a ball? — Test bounce height in different humidity conditions.

D. Environmental & Earth Science

46. How does soil type affect water infiltration? — Time how fast water sinks into sand, clay, loam.
47. Do plants grow better with rainwater or tap water? — Compare growth using each water type.
48. How does air pollution affect local plant leaves? — Compare leaf health from urban vs. rural areas.
49. Which material decomposes fastest in compost? — Test vegetable peels, paper, plastic (control) in compost.
50. Does shade affect the temperature of playground surfaces? — Measure surface temps in sun and shade.
51. How does salt pollution affect freshwater organisms? — Observe small aquatic animals in varying salinity.
52. What is the best natural method to purify cloudy water? — Test sand, charcoal, cloth filtration.
53. How effective are different materials at reducing runoff? — Simulate rain and measure water retained by surfaces.
54. Does planting trees reduce local temperature? — Compare surface temps near trees and open areas.
55. How does oil affect aquatic plant growth? — Add small oil drops to water and observe plants.
56. Which city areas have higher noise levels during rush hour? — Measure decibel levels at various spots.
57. Does litter type affect decomposition time in soil? — Bury different litter and check after weeks/months.
58. How does pH of rainwater vary across locations? — Collect rain samples and test pH.
59. Which mulch type conserves water best? — Cover soil with different mulches and measure moisture retention.
60. How effective are natural bee-attracting plants in your area? — Plant varieties and count bee visits.

E. Computer Science & Technology

61. How does algorithm A compare to B for sorting speed on large lists? — Implement both and time them with increasing list sizes.
62. Can a simple chatbot answer basic customer questions accurately? — Build rule-based chatbot and test with sample Q&A.
63. Does image compression reduce quality for facial photos? — Compress photos and measure quality loss (subjective + metrics).
64. How accurate is speech-to-text for different accents? — Test with recorded phrases and compare transcripts.
65. What affects Wi-Fi speed: distance, wall type, or number of devices? — Measure throughput under different conditions.
66. Can machine learning predict house price using a small dataset? — Train simple model and evaluate predictions.
67. How does screen brightness affect battery life of a phone? — Run battery drain tests at set brightness levels.
68. Which authentication method (PIN vs fingerprint) is faster and user-friendly? — Time login and survey users.
69. How does file format impact streaming quality? — Play same video in different formats and note buffering/quality.
70. Does keyboard layout affect typing speed? — Test QWERTY vs. other layouts with volunteers.
71. Can motion sensors detect room occupancy accurately? — Build prototype and compare to direct observations.
72. Which compression algorithm yields smallest file size for text? — Run popular compressors and compare sizes.
73. How does lighting affect camera autofocus speed? — Measure autofocus time in different lighting.
74. Can a smartphone app help students memorize vocabulary faster? — Create simple flashcard app and measure recall improvement.
75. Which password policies produce the strongest but memorable passwords? — Test user recall and entropy metrics.

F. Mathematics & Statistics

76. Does the day of week affect students’ test scores? — Collect test data and analyze patterns.
77. How accurate is mental multiplication versus calculator for two-digit numbers? — Time trials and compare accuracy.
78. Are patterns in coin tosses truly random? — Perform many tosses, analyze streak lengths and frequencies.
79. Does amount of sleep correlate with test performance? — Survey students on sleep and scores; compute correlation.
80. Which forecasting method predicts monthly sales better (moving average vs. linear)? — Use sample data and compare errors.
81. How does sample size affect confidence in survey results? — Simulate or collect varying sample sizes and compare CI widths.
82. Do younger siblings score differently from firstborns on a test? — Collect family position and scores; analyze.
83. Can Sudoku-solving time be predicted by number of initial clues? — Test puzzles with varying clues.
84. How does averaging method (mean/median/mode) change result for skewed data? — Use skewed datasets and compare.
85. What is the probability of two people sharing a birthday in a group of N? — Experiment with groups and compare to theory.
86. Does practice with flashcards reduce time to memorize sequences? — Time memorization after practice sessions.
87. Is there a relationship between exercise frequency and math scores? — Survey and compute correlations.
88. How does rounding method affect cumulative billing totals? — Simulate billing with different rounding rules.
89. Which coin-change system yields the fewest coins for random amounts? — Compare coin systems via simulation.
90. Can simple linear regression predict weight from height accurately? — Collect height-weight pairs and fit model.

G. Social Science & Psychology

91. Does background music affect concentration during homework? — Test tasks with and without music and measure accuracy/time.
92. How does phone notification frequency affect study focus? — Simulated study sessions with varying notifications.
93. Do people prefer handwritten notes or typed notes for memory? — Compare recall after studying from each.
94. Does group size affect idea generation in brainstorming? — Run sessions with different group sizes and count ideas.
95. How does color of a room influence mood? — Survey participants after sitting in differently colored rooms.
96. Are people more generous in the morning or evening? — Time-based behavioral experiments or survey.
97. Does the presence of plants in a room reduce stress? — Measure stress indicators after time in rooms with/without plants.
98. How does social media use before bed affect sleep quality? — Survey and compare sleep metrics.
99. Does smiling affect perceived friendliness in photos? — Show photos and ask ratings.
100. Do people prefer stories with moral lessons more than those without? — Read two story types and measure preference.
101. Does wearing formal clothes change performance on a task? — Have volunteers perform tasks in different attire.
102. How does peer praise affect a student’s willingness to try hard tasks? — Controlled classroom experiment.
103. Are people better at recognizing faces from their own culture? — Face recognition test with diverse faces.
104. Does giving small gifts increase cooperation in teams? — Team tasks with/without gift incentives.
105. How does noise level in a cafeteria affect conversation length? — Observe and measure talk duration.

H. Engineering & Electronics

106. How does blade angle affect wind turbine efficiency? — Build small turbine blades and measure power output.
107. What battery type provides the longest life for a small LED lamp? — Test various batteries and record run time.
108. Does the length of antenna affect signal strength for a radio? — Measure reception with antennas of different lengths.
109. How does gear ratio change speed vs. torque in a small motor? — Build gear sets and test performance.
110. Which solar cell placement angle produces most energy during a day? — Measure solar output at different tilt angles.
111. Does adding fins improve heat dissipation from a CPU model? — Build heat sinks and compare temps.
112. How does wire gauge affect motor performance? — Test same motor with different wire gauges.
113. Which materials are best for building a strong but light bridge model? — Build models and load-test them.
114. Can a simple water filter built with layers remove visible impurities? — Construct filter and test turbidity.
115. How does propeller size affect drone lift in a small prototype? — Test lift for prop sizes.
116. Does vibration dampening material reduce sensor noise? — Mount sensor with/without dampers and compare readings.
117. Which type of actuator (servo vs. stepper) is more precise for small movement? — Test positional accuracy.
118. How does coolant flow rate affect model engine temperature? — Vary flow and log temps.
119. Can a low-cost sensor detect air quality effectively? — Calibrate sensor and compare to known values.
120. What is the best wheel shape for a small robot on gravel? — Build/test wheels and measure speed/stability.

I. Arts, Design & Media

121. Which color combinations are rated as most pleasing by viewers? — Show palettes and collect ratings.
122. Does font type affect reading speed in children? — Time reading passages in different fonts.
123. How does lighting angle change perceived texture in photography? — Photograph objects under different lights and compare.
124. Which mural style attracts more attention in a school corridor? — Display mockups and survey passersby.
125. Does background music change the viewer’s emotion when watching a short video? — Show clips with different music and survey feelings.
126. Which packaging design makes a product look more premium? — Show mockups and get preferences.
127. Does the size of brush strokes affect how people interpret a painting? — Show versions with big vs fine strokes and survey.
128. How well do viewers remember images with text vs. without text? — Show images and test recall.
129. Does animation speed affect comprehension of an infographic? — Use varying speeds and test understanding.
130. Which poster layout leads to better retention of event details? — Compare layouts and test recall.
131. Do people prefer symmetrical or asymmetrical logos? — Show logos and collect preference ratings.
132. How does the use of negative space affect logo recognition? — Test recognition with variations.
133. Which color of background increases legibility for elderly readers? — Measure reading speed/comfort.
134. Does adding subtitles increase engagement with short videos? — Run video tests with/without subtitles.
135. How does the scale of artwork (small vs large) change emotional impact? — Show different sizes and survey responses.

J. Interdisciplinary & Practical Life Projects

136. Does handwashing technique affect number of bacteria left on hands? — Swab hands before/after techniques and culture.
137. Which study schedule produces best recall: short frequent sessions or one long session? — Test recall after both schedules.
138. Does using a planner app improve homework completion rate? — Students track tasks with/without app.
139. How does different exercise types (cardio vs strength) affect short-term mood? — Mood survey before/after sessions.
140. Which light source helps reduce eye strain when reading on screens? — Compare warm vs cool lighting and ask participants.
141. Which eco-friendly product packaging decomposes fastest at home? — Test compostability of options.
142. Does the angle of a bookshelf affect book resting pressure and shelf life? — Test sagging or damage over time.
143. Which method (list vs. map) helps people remember routes better? — Test navigation recall after studying both methods.
144. Can a simple budget plan reduce weekly spending? — Track spending with/without plan and compare.
145. Which natural insect repellant works best in backyard settings? — Test repellents and count insect landings.
146. Does using flashcards with images improve vocabulary more than text-only? — Test recall across groups.
147. How does plant watering frequency affect houseplant lifespan? — Test watering schedules and survival.
148. Which recyclable material makes the strongest model boat? — Build boats from different recycled items and test float/load.
149. Does ergonomic chair design affect typing speed and comfort? — User tests and comfort surveys.
150. Can LED night-lights improve sleep quality for children afraid of the dark? — Small sleep study with parent logs.

Quick templates: how to turn a question into a full project

• Title: Keep the question as the title.
• Hypothesis: One line predicting the answer.
• Materials: Short bullet list.
• Procedure: Numbered steps (repeat trials at least 3).
• Measurements: What you will measure and units.
• Analysis: Use mean, charts, or simple stats.
• Conclusion: Directly answer the question and mention limitations.

Presentation tips

• Show your question on the top of the poster.
• Use 1–2 clear graphs for results.
• Include photos of your experiment.
• Practice a 1-minute summary and a 5-minute explanation.
• Prepare to answer “Why did you do this?” and “What would you change next?”

Must Read: Moon Phases Project Ideas for Students: 60 Powerful & Creative Activities

Final words

You now have 150 question-style project ideas and a clear plan to turn any one of them into a complete school or fair project. Start by choosing one that excites you and fits your time and tools.

Remember: a good project is not the one with the fanciest equipment — it’s the one with a clear question, careful method, and honest conclusion.

If you want, tell me which subject or difficulty level you prefer and I’ll pick 5 best ideas from this list and give you a ready-to-follow project plan (materials, step-by-step method, and how to present). Good luck — you’ve got this!