AZSCI Engineering and Technology 2

Question 1

An engineering team designs a water filtration system for a remote village. The initial prototype works effectively but requires a component that is only available internationally, making it expensive and difficult to replace. Which of the following represents the MOST critical shift in constraints when moving from the prototype to a sustainable, real-world solution?

Accepted Answer

Redesigning the system to use only locally sourced, readily available materials.

Answer

While filtration rate and weight are valid criteria, the primary constraint for a sustainable, real-world solution in a remote area is maintainability and accessibility of parts. Relying on expensive, internationally-sourced components creates a long-term dependency and potential for failure if a part cannot be easily replaced. Redesigning with local materials addresses the critical constraints of cost, availability, and long-term usability in the specific context.

Question 2

During stress testing, a newly designed carbon fiber bicycle frame unexpectedly cracks near a joint. A failure analysis is initiated. What is the primary goal of this analysis?

Accepted Answer

To determine the root cause of the crack, whether it's a design flaw, material defect, or manufacturing error.

Answer

Failure analysis is a systematic investigation to determine the underlying reason for a failure. Its main purpose is not to assign blame or immediately restart, but to learn from the failure. By identifying the root cause—be it in the design, materials, or fabrication process—engineers can make specific, informed changes to prevent the same failure from happening again.

Question 3

A company is developing a new smartphone. A Life Cycle Assessment (LCA) is conducted to evaluate its environmental impact. Which stage of the product's life cycle would an LCA analyze that is often overlooked by consumers?

Accepted Answer

The environmental impact of mining rare earth metals for its components.

Answer

A Life Cycle Assessment (LCA) evaluates the entire environmental impact of a product from 'cradle to grave'. This includes raw material extraction, manufacturing, transportation, use, and end-of-life disposal. While consumers are familiar with the 'use' phase (charging), the significant environmental and social impacts of extracting raw materials like lithium and rare earth metals are a critical but less visible part of the LCA.

Question 4

The development of CRISPR gene-editing technology has been a major breakthrough. Which of the following BEST explains the primary reason for establishing strict bioethical guidelines for its use?

Accepted Answer

To address the potential for unintended, long-term consequences on the ecosystem and inheritable genetic changes in humans.

Answer

Bioethics is concerned with the moral implications of new biological and medical technologies. With powerful tools like CRISPR, the main ethical concerns revolve around its potential for profound and permanent impacts, such as altering the human germline (making changes that can be passed to future generations) or creating organisms that could disrupt natural ecosystems. Guidelines are created to navigate these complex societal, moral, and safety issues.

Question 5

Which of the following is an example of a technological application resulting from a prior scientific discovery?

Accepted Answer

Building a satellite-based global positioning system (GPS) by applying the principles of Einstein's theory of relativity.

Answer

Scientific discovery is about understanding the natural world, while technology is the application of that knowledge to solve problems. The theory of relativity, which describes how gravity affects time, is a scientific discovery. GPS technology is a direct application of that scientific principle; it would not be accurate without making calculations to account for relativistic effects. The development of thermodynamics *after* the steam engine is an example of technology driving scientific discovery.

(AZSCI) Arizona Science Test Practice Test

(AZSCI) Arizona Science Test Practice Test

AZSCI Engineering and Technology 2