[Free] 2018(Jan) EnsurePass Examcollection GED GED-Science Dumps with VCE and PDF 71-80

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GED Science Exam

Question No: 71

Although every living plant or animal differs now from its early ancestors, each still shares some characteristics with its early family members.

In which set do the animals likely share common ancestors?

  1. cat, lion, raccoon

  2. cow, sheep, goat

  3. dog, wolf, coyote

  4. horse, zebra, giraffe

  5. whale, trout, dolphin

Answer: C

Question No: 72

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?

  1. Grease decreases the speed of the axle.

  2. Grease increases friction.

  3. Grease is hot and adds heat.

  4. Grease makes the bearings stick to the axle.

  5. Grease decreases friction.

Answer: E

Question No: 73

Density is the relationship of the mass of an object to its volume. A formula that describes density isdensity = mass/volumewhere mass is the quantity of matter present and volume measures how much space the matter occupies.

Suppose that a tanker truck overturns, causing hazardous vapors to leak from the tank. As the vapors leak out, they appear to fall to the ground and then travel along the ground.

Which conclusion about density may be correctly drawn from this information?

  1. The weight of the hazardous vapor is greater than that of the truck.

  2. A safe place to go would be the nearest basement.

  3. The density of the hazardous vapor is greater than that of water.

  4. Spraying the tank truck with water would be the safest thing to do.

  5. The density of the hazardous vapor is greater than that of air.

Answer: E

Question No: 74

All types of plant life anchor the soil and absorb much water and, thus, may lessen the effects of flooding at certain times of the year.

Which of the following would reduce flooding conditions?

  1. a large amount of rainfall in a short period of time

  2. the accumulation of snow during the winter

  3. planting more trees upstream

  4. building parking lots on farm land

  5. the construction of more bridges

Answer: C

Question No: 75

On a sunny day, a magnifying glass can concentrate sunlight to the point where the light can cause paper to burn.

Which of the following materials would be the best substitute for a magnifying glass?

  1. a piece of window glass held up to the Sun

  2. several mirrors, each reflecting light to the same spot

  3. a piece of waxed paper covering a dark circle

  4. several pieces of white plastic arranged in a circle

  5. a bright flashlight shining at a 45-degree angle to the paper

Answer: B

Question No: 76

Wheat is the staple cereal for most of the world. Flour is made from the kernel of the wheat plant. The kernels are first separated from the plant stem and then broken apart by the milling process. The husk, the outer layer unusable for most purposes, is removed.

The wheat kernel (whole grain) has three main parts: germ, bran, and endosperm. The germ is especially rich in vitamin E, niacin, and riboflavin. The bran, a protective coating around the kernel, is also a rich source of nutrients and fiber. The endosperm, making up 83% of the kernel, is the soft inside portion containing starch and proteins.

Although the enrichment of white flour restores some of the lost nutrients, there are some vitamins and minerals that are lost in the refining process and not replaced. A valuable source of fiber is also lost.

Ling reads an article that states that many people don’t get enough fiber in their daily diet. Which type of bread would be the best to recommend to Ling?

  1. whole wheat bread

  2. unenriched white bread

  3. enriched white bread

  4. sourdough bread

  5. French bread

Answer: A

Question No: 77

The battery of an automobile produces electricity from a chemical reaction. This electricity leaves the battery from a post called a terminal and is used in starting the engine.

Sometimes a crusty deposit forms on the terminals, preventing the engine from starting. Simply cleaning off the deposit often restores the battery to operable condition.

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Which effect does the deposit have on the battery terminals?

  1. conducts electricity

  2. improves spark plug firing

  3. causes hazardous sparks

  4. does not conduct electricity

  5. is caused by hard water

Answer: D

Question No: 78

Two students are testing the effect of light intensity on photosynthesis. They place a green aquarium plant inside a clear glass container of pond water and turn on a floodlight located three feet away. Bubbles of oxygen soon come from the plant. Then, the students move the floodlight a foot closer to the glass and leave it for ten minutes.


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Which of the following statements represents the BEST prediction about the aquarium and its contents?

  1. The bubbles decrease in size.

  2. The rate of bubbling increases.

  3. The bubbles come from the upper parts of the plants.

  4. The bubbles come from the lower parts of the plants.

  5. The plant is floating on the surface of the water.

Answer: B

Question No: 79

– 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 quot;cutquot; 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 quot;fingerprintquot; band patterns for six

individuals-a missing child and five young people who have the missing child’s physical characteristics.

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– Exhibit –

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

  1. Child 1

  2. Child 2

  3. Child 3

  4. Child 4

  5. Child 5

Answer: C

Question No: 80

– Exhibit-

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– Exhibit –

Nancy and Sophia are studying weather in science class. Nancy tells Sophia that warm air ismore dense than cold air.

Which of the following statements proves that Nancy’s belief is false?

  1. A cold air mass can push a warm air mass upward.

  2. A warm air mass cannot form clouds.

  3. Cool, dry air can move around warm, moist air.

  4. Cold, dry air pushes clouds past a front.

  5. Precipitation forms where cold and warm air masses meet.

Answer: A

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