NAEP - National Assessment of Educational Progress Technology and Engineering Literacy Grade 7 — Questions and Answers
Question 1: A student designs a model water filtration system, tests it with muddy water, observes that it fails to remove enough sediment, adjusts the design, and tests it again. This process best illustrates which step of the engineering design process?
- Identifying the problem
- Conducting background research
- Building and testing a prototype (Correct answer)
- Defining constraints and criteria
Correct answer: Building and testing a prototype
Building a model, testing it, and revising based on results is the prototype-and-iterate phase of the engineering design process. Iteration — repeating the test-evaluate-improve cycle — is what distinguishes this step from earlier planning steps.
Question 2: Which of the following best describes an algorithm?
- A type of malware that corrupts operating system files
- A step-by-step set of instructions designed to solve a problem or complete a task (Correct answer)
- A network protocol used to encrypt internet traffic
- A programming language used exclusively for mobile applications
Correct answer: A step-by-step set of instructions designed to solve a problem or complete a task
An algorithm is a precise, ordered sequence of steps or rules used to solve a problem or perform a computation. Algorithms underlie everything from search engines to GPS navigation.
Question 3: A city installs sensors on streetlights that automatically dim when no pedestrians or vehicles are detected nearby, saving energy. This is an example of which technological concept?
- Fiber optic communication
- The Internet of Things (IoT) (Correct answer)
- Augmented reality
- Virtual private networking (VPN)
Correct answer: The Internet of Things (IoT)
The Internet of Things refers to physical objects embedded with sensors and connected to the internet so they can collect and exchange data. Smart streetlights that sense their environment and respond automatically are a classic IoT application.
Question 4: Engineers studying the hollow, lightweight structure of bird bones developed stronger yet lighter materials for aircraft frames. The design approach of drawing inspiration from nature to solve engineering problems is called:
- Reverse engineering
- Rapid prototyping
- Biomimicry (Correct answer)
- Systems analysis
Correct answer: Biomimicry
Biomimicry is the practice of imitating strategies, structures, or processes found in nature to address human design challenges. Nature has already optimized many solutions over millions of years of evolution.
Question 5: Which of the following best explains why engineers assess the entire life cycle of a product — from raw material extraction through manufacturing, use, and disposal — during the design phase?
- To maximize the product's retail price
- To reduce environmental impact and support sustainable design (Correct answer)
- To ensure the product meets only current safety regulations
- To shorten the manufacturing timeline as much as possible
Correct answer: To reduce environmental impact and support sustainable design
Life cycle assessment (LCA) helps engineers identify environmental costs and impacts at every stage of a product's existence. This informs more sustainable design decisions, such as choosing recyclable materials or reducing energy consumption in production.
Question 6: When troubleshooting a circuit that fails to light a bulb, a student tests each component — battery, wires, and bulb — one at a time while keeping the rest of the circuit unchanged. This diagnostic approach is most similar to which scientific and engineering practice?
- Designing a controlled experiment (Correct answer)
- Creating a scale model
- Writing a technical specification
- Filing a patent application
Correct answer: Designing a controlled experiment
Testing one variable or component at a time while holding all others constant mirrors the logic of a controlled experiment, allowing the student to isolate and identify the faulty element causing the problem.
NAEP - National Assessment of Educational Progress Technology and Engineering Literacy Grade 7
A student designs a model water filtration system, tests it with muddy water, observes that it fails to remove enough sediment, adjusts the design, and tests it again.
This process best illustrates which step of the engineering design process?