Glass
I wonder who first discovered glass. This commodity has been a part of civilization from the very beginning. Imagine a world without glass! How dark and dismal it would be. No windows, corrective lenses, telescopes, microscopes, cameras, sparkly drinking containers or mirrors. Life would not be the same without this wonderful discovery. Thank you, whoever found glass!
Glass is not an element, but a combination of several elements. It is a hard, brittle, transparent solid material composed mainly of silica, with additives to change the character of the glass. Common additives are soda, lime, lead, and boron. Each additive changes the properties of the final product. Soda and lime are the most common additives, accounting for about 90% of glass production. Adding lead increases reflectivity, causing the glass to "sparkle." The addition of boron changes the thermal and electrical properties of glass, allowing cookware that can be used in the oven without shattering.
What is the definition of "Brittle" as used in the second paragraph?
Resilient.
Easily broken.
See-through.
Flexible.
Correct Answer : B
Brittle refers to a material or substance that is hard but lacks flexibility and tends to break or shatter when subjected to stress or pressure
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Related Questions
Correct Answer is A
Explanation
The paragraph states that Isaac Asimov was widely considered a master of the science fiction genre. It mentions his association with Robert A. Heinlein and Arthur C. Clarke as the "Big Three science-fiction writers" during his lifetime. Additionally, Asimov's prolific body of work includes numerous science fiction novels, which are widely recognized as his primary contributions to literature. Therefore, based on his reputation, his association with other science fiction writers, and the emphasis on his science fiction works, option A, "Science Fiction," is the most appropriate choice for the type of writing for which Mr. Asimov was most famous.
Correct Answer is D
Explanation
Based on the given information, none of these options accurately describe the stance or purpose of the author. The passage does not provide any indication of promoting myths about lightning, opposing taking cover during storms, favoring lightning rods, or enjoying watching lightning from an open field. Therefore, none of the options provided accurately represent the author's position.
Correct Answer is C
Explanation
The passage discusses how emergency rooms are being used as primary care facilities for thousands of patients, leading to increased costs for hospitals and subsequently higher rates for paying patients and insurance companies. It also mentions that even individuals with insurance may not be able to afford the co-payment or deductible for office visits, further contributing to the problem. This suggests that there is a crisis in numbers management within the healthcare industry, highlighting the unsustainable and costly nature of the current system
Correct Answer is A
Explanation
The paragraph suggests that the purpose of a factory layout is for safety and profit (option A). It states that work areas should be large, clean, well lighted, and airy, indicating a focus on creating a safe and comfortable working environment. Additionally, it mentions that a
well-designed factory with streamlined workstations and equipment can double production and improve the rate of on-time deliveries, highlighting the potential for increased profitability. The paragraph does not mention compliance with insurance company requirements (option B), meeting government regulations (option C), or maintenance of machinery (option D) as the primary purpose of a factory layout.
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