최신 GED Certification GED-Science 무료샘플문제:

1. Which fact best describes the impact of photosynthesis on Earth?

A) is important in the food web
B) is necessary for all life to continue
C) enables people to have a diverse food supply
D) is a series of complex chemical reactions
E) is a process unique to plants and animals

2. -- Exhibit -
Our genes consist of DNA molecules. DNA fingerprinting allows the detection of DNA fragment patterns in different people. In this process, enzymes are used to "cut" a person's DNA into pieces. The length of these fragments differs from person to person and, therefore, there is little chance that two or more people will produce the same pattern. The DNA fragments of different people can be readily compared. DNA fingerprinting has many applications in law enforcement, medicine, and other areas.
The diagram below lists simulations of the DNA "fingerprint" band patterns for six individuals-a missing child and five young people who have the missing child's physical characteristics.

-- Exhibit -
Based on the DNA diagram, which of the five children might be related to the missing child?

A) Child 2
B) Child 1
C) Child 3
D) Child 4
E) Child 5

3. -- Exhibit -
Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X rays, and gamma rays are forms of radiant energy that make up the electromagnetic spectrum. Each portion of the electromagnetic spectrum has waves that vary in frequency and wavelength, but all can be used by people. Radio waves can be used to carry music and voices for great distances through air, X rays can be used for diagnostic work in medicine, and infrared radiation can be used for heating and drying.

-- Exhibit -
Most genetic damage is caused by very short wavelengths of the electromagnetic spectrum.
Which of the following statements would support this statement?

A) Infrared light is used in night photography.
B) Short wavelengths may be photographed.
C) Ultraviolet rays are stopped by the skin.
D) Gamma rays penetrate very deeply and are highly energetic.
E) Microwaves may be used to carry telephone conversations.

4. Making products from recycled materials, such as aluminum cans, glass, and plastic usually saves energy and other resources. For example, it takes about 75% less energy to make steel from scrap than from ore. All forms of recycling involve some energy to produce the recycled materials, a process that also results in the production of some pollution.

The chart at the left shows the energy savings from recycling.
When Anil is at the grocery store, he can choose to buy juice in a glass bottle, an aluminum can, a plastic jug, a juice box (paper), or foil-covered juice container.
If Anil's community requires that he recycles, which container would provide the MOST overall energy savings?

A) plastic jug
B) waxy, cardboard juice box
C) glass bottle
D) foil-covered container
E) aluminum can

5. Some work is converted into heat whenever there is friction. For example, when you rub your hands together, they feel warm because of the friction. The same effect occurs when an automobile axle spins on ball bearings-the axle and bearings get hot.
A mechanic says that the heat produced will be decreased if grease is deposited between the bearings and the axle.
Which of the following statements would provide the strongest support for the mechanic's claim?

A) Grease makes the bearings stick to the axle.
B) Grease decreases friction.
C) Grease is hot and adds heat.
D) Grease decreases the speed of the axle.
E) Grease increases friction.

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