1. A scientist is testing a new fertilizer. They give one plant the new fertilizer and double the amount of water it receives. A second, identical plant receives no fertilizer and the normal amount of water. To make this a fair test of the fertilizer, what is the most important change the scientist should make?
- A. Use two different types of plants.
- B. Give both plants the same amount of water.
- C. Place one plant in sunlight and the other in shade.
- D. Add even more fertilizer to the first plant.
2. An engineer wants to test how a car's speed is affected by tire pressure, engine size, and vehicle weight. Testing all these on a real car is complex. How could a computer simulation be a useful tool for this engineer?
- A. A simulation can change all the variables simultaneously for a faster result.
- B. It can easily test each variable one at a time.
- C. A simulation can prove the car is perfectly safe.
- D. It can build a physical model of the car automatically.
3. In a scientific investigation, what is the primary purpose of conducting a "controlled test"?
- A. To get the desired result as quickly as possible.
- B. To prove a pre-existing hypothesis is always correct.
- C. To ensure that only one variable is changed at a time, allowing for a clear cause-and-effect conclusion.
- D. To use as many variables as possible to see what happens.
4. A student wants to see if the type of soil affects how tall a plant grows. They plant a bean seed in sandy soil on a sunny windowsill and a corn seed in clay soil in a dark closet. Why is the student's conclusion that sandy soil is better for plant growth unreliable?
- A. The experiment did not last long enough to be valid.
- B. Corn seeds are always harder to grow than bean seeds.
- C. They changed the soil type, plant type, and amount of light all at once.
- D. The student should have measured the plants every single day.
5. What is the main problem with changing two variables at the same time during an experiment, such as increasing both the number of magnets and their distance from an object?
- A. It makes the experiment take twice as long to complete.
- B. The results will simply be the average of the two changes.
- C. It is impossible to determine which variable was responsible for the observed change.
- D. The experiment becomes too expensive and complicated to perform.
6. An engineering team is developing a new magnetic launch system for a roller coaster with the goal of maximizing speed. Which of the following is a key design *variable* they would manipulate and test?
- A. The final launch speed achieved.
- B. The distance between magnets.
- C. The overall popularity of the ride.
- D. The daily operating hours of the park.
7. If the primary *criterion* for a magnetic roller coaster launch is 'maximum speed,' which design would engineers likely favor?
- A. The design that uses the fewest number of magnets.
- B. The design that is the easiest and quickest to assemble.
- C. The design predicted to store the most potential energy.
- D. The design that makes the least amount of noise during launch.
8. The process of breaking down a design to understand its components and variables is a core part of which activity?
- A. Product marketing
- B. Final construction
- C. Engineering design analysis
- D. Customer satisfaction surveys
9. What is the primary purpose of conducting an engineering design analysis when presented with multiple solutions to a problem?
- A. To select the design that is cheapest to manufacture, regardless of performance.
- B. To systematically compare proposed designs against specific criteria to identify the most effective one.
- C. To build a small-scale prototype of every single design option that has been proposed.
- D. To prove that the engineers' initial hypothesis was correct from the start.
10. Why would engineers propose multiple, competing designs for a project like a magnetic roller coaster launch instead of settling on the first idea?
- A. To have backup plans in case the first design is too expensive.
- B. To explore different approaches and trade-offs to find the optimal solution that best meets the performance criteria.
- C. Because engineering regulations require a minimum of three designs to be submitted for any project.
- D. To create more work for the design team and extend the project timeline.