다운로드 GED : GED-Science 질문 & 답 PDF & Test Software

Sonar is a tool that uses high-frequency ultrasonic waves for sound navigation and ranging. When this system is used, high-frequency ultrasonic waves are sent out, bouncing off objects and reflecting back to their source. This reflected sound is called an echo. The time taken for each emitted sound to return gives information as to how far away the object is.
From the information given, which of the following would be LEAST LIKELY to use sonar?

• A. a honeybee collecting pollen
• B. a bat flying at night looking for food
• C. a dolphin navigating underwater
• D. a submerged submarine looking for enemy ships
• E. a fishing ship looking for schools of fish

-- Exhibit -
The most realistic description of energy flow through an ecosystem is a food web that represents an interconnected series of food chains. In general, the greater the number of alternative channels through which energy can flow, the greater the stability of the food web and the ecosystem.

The diagram shows a typical food web for a wet meadow. The hawk and the fox obtain nourishment by preying upon rabbits, frogs, snakes, and mice. The fox may even eat grasshoppers. If, for example, the rabbit population is reduced, possibly because of bad weather during the breeding season, the fox and hawk would shift their predatory pressure to other forms of prey. The rabbit population would then have a chance to bounce back and the ecosystem would remain stable.
-- Exhibit -
Based on the diagram, which consumer would have the greatest chance of surviving if the amount of available prey changes during the different seasons?

• A. rabbits
• B. hawks
• C. mice
• D. snakes
• E. foxes

A spring can be compressed or stretched. The amount of force that is required for a spring to return to its original position depends on its "spring constant." If the spring constant is large, thespring is rigid and difficult to stretch or compress. If the spring constant is small, the spring stretches and compresses easily.
The diagram below depicts the amount of compression that results for spring A and spring B after equal force is applied to both.

Which situation requires a spring with the largest spring constant?

• A. A shock absorber spring keeps a truck from bouncing when it hits a pothole.
• B. A spring holds staples in a stapler.
• C. A child plays with a "Slinky" spring.
• D. A jack-in-the-box springs out of its box.
• E. The spring in a pinball game is used to release the ball.

Which conclusion is best supported by the graph? Exhibit:

Exhibit

• A. The tree's height and diameter are not related at all.
• B. The shorter the tree, the bigger the diameter.
• C. The taller the tree, the bigger the diameter.
• D. As a tree's height increases, its diameter increases, but only for the first year.
• E. The taller the tree, the smaller the diameter.

Maria bought a used desk at a yard sale. When she found a note dated May 1419 under the bottom of a drawer, she decided that the desk should undergo radioactive carbon dating to verify its age.
Who would most likely be qualified to do this type of study?

• A. cabinetmaker
• B. auto mechanic
• C. store manager
• D. forester
• E. nuclear technician