GED GED Science GED Science Exam Online Training
GED GED Science Online Training
The questions for GED Science were last updated at Nov 19,2024.
- Exam Code: GED Science
- Exam Name: GED Science Exam
- Certification Provider: GED
- Latest update: Nov 19,2024
The widespread use of antibiotics has created a frightening threat to our safety. While antibiotics have offered life-saving treatment for countless diseases, their misuse and overuse have contributed to the evolution of deadly bacteria that are resistant to treatment. Although there is a reluctance to give up the demand for antibiotics, most people accept scientists’ warnings of impending catastrophe.
Which choice best explains why doctors now prescribe antibiotics less often than in the past?
- A . The newer antibiotics are too expensive for the average consumer.
- B . Insurance does not cover many antibiotic prescriptions.
- C . Antibiotic use causes frequent digestive upsets.
- D . Time constraints prevent doctors from writing as many prescriptions.
- E . Bacteria become resistant to treatment by certain antibiotics.
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The pH scale is a measure of the acidity of a substance. The numerical range of the scale is from 0.0 to 14.0. A midpoint pH of 7.0 designates a neutral substance (neither acid nor base). A pH lower than 7.0 denotes an acid substance, whereas a pH higher than 7.0 denotes a basic substance.
The pH scale is a measure of the acidity of a substance. The numerical range of the scale is from 0.0 to 14.0. A midpoint pH of 7.0 designates a neutral substance (neither acid nor base). A pH lower than 7.0 denotes an acid substance, whereas a pH higher than 7.0 denotes a basic substance.
Which of the following substances is the MOST acidic?
- A . lemon juice(pH = 2.3)
- B . vinegar(pH = 2.8)
- C . orange juice(pH = 3.5)
- D . milk(pH = 6.5)
- E . seawater(pH = 8.4)
As pressure in a closed container is increased, the volume, or amount of space that a gas takes up, decreases. Divers who work underwater use tanks containing oxygen in order to breathe. The amount of oxygen in the tanks allows the divers to stay underwater for some time, yet the tanks are not huge.
Which statement best explains this occurrence?
- A . Oxygen has to be in small metal tanks so that divers don’t sink.
- B . Oxygen takes up only a small amount of the air that we breathe.
- C . If the tanks are small, the fish will not be frightened by the divers.
- D . Since the oxygen is under pressure, a large amount of oxygen can be placed in these small tanks.
- E . Most divers don’t stay underwater for a very long time because they get very cold quickly.
The microorganisms that cause food to spoil grow best at room temperature and in the presence of water.
Which of the following actions BEST helps prevent food spoilage?
- A . exposing the food to air
- B . keeping the food at room temperature
- C . adding water to the food
- D . freezing the food
- E . covering the food while warm
All kerosene stoves produce carbon monoxide and carbon dioxide gases as by-products of combustion. Both gases are dangerous to human beings.
When using a kerosene stove, which action provides the best protection against these harmful gases?
- A . keeping a fire extinguisher near the stove
- B . locating the stove far from walls and furniture
- C . using only the correct grade of kerosene
- D . circulating air around the room with a fan
- E . keeping the room well ventilated
Atoms in gases are in constant motion and in constant collision with each other. When atoms of A and B collide, they react to form a product P.
What is the effect of increasing pressure on the gases?
- A . an increase in P
- B . a decrease in P
- C . an increase in A
- D . an increase in B
- E . no change in A, B, or P
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 weatherduring 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.
Rabbits are destroying a farmer’s vegetable garden.
Based on the food web, if the farmer removes the rabbits, which other organisms might be directly affected?
- A . foxes and snakes
- B . hawks and snakes
- C . grasshoppers and mice
- D . foxes and hawks
- E . grasshoppers and grass
A person is interested in trilobites. A book on which subject would most likely furnish information about trilobites?
- A . physics
- B . chemistry
- C . biology
- D . nutrition
- E . astronomy
Vertebrates, animals with backbones, are divided into the following five major groups: fish, reptiles, amphibians, birds, and mammals. Some characteristics of these groups are given
in the table below.
Which statement is true if an animal lives in water, does not lay eggs, and is warmblooded?
Exhibit:
- A . a fish
- B . a reptile
- C . a mammal
- D . an amphibian
- E . a bird
The greenhouse effect explains why a car’s interior can get hot on a sunny day even if it is cool outside. The glass windows allow the Sun’s rays to pass through to the interior but prevent heat rays from escaping to the outside. Certain gases, such as carbon dioxide and nitrous oxide, act like the glass in a greenhouse when they are present in the atmosphere.
Both natural and human activities lead to the release of gases that contribute to the greenhouse effect. During recent summers, forest fires have contributed to the loss of millions of acres of forest. These fires have resulted in the release of smoke and ash as well as greenhouse gases.
Based on the information, which statement most likely predicts the result of ongoing widespread forest fires?
- A . Forest fires are unlikely to affect atmospheric temperature.
- B . Forest fires decrease the amount of atmospheric greenhouse gases.
- C . Greenhouse gases could help form new animal species.
- D . There could be a gradual increase in average atmospheric temperatures.
- E . There could be a gradual decrease in average atmospheric temperatures.
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