GED Updated GED-Science Exam Questions and Answers by dhruv

The amount of carbon dioxide in the atmosphere is increasing, therefore contributing to the phenomenon called the greenhouse effect. The end result is an increase in average temperatures worldwide.

A decrease in global warming could result if we reduced the consumption of materials that give off carbon dioxide when burned.

To reduce global warming, what should be used LESS?

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?

In the diagram below, the shaded parts show how much water each boat displaces as it floats. Boat B weighs more than boat A, since it has more people aboard. Boat B displaces more water than does boat A. For floating to happen, the weight of the water displaced has to be equal to the weight of the floating boat.

-- Exhibit --

In the diagram below, the shaded parts show how much water each boat displaces as it floats. Boat B weighs more than boat A, since it has more people aboard. Boat B displaces more water than does boat A. For floating to happen, the weight of the water displaced has to be equal to the weight of the floating boat.

-- Exhibit --

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Flood waters do not have to be very deep to float a car. In fact, only two feet of water, about knee high, will float the average car.

Which statement BEST explains why a car floats in such a small amount of water?

Beginnings of new time spans are characterized by major changes in life-forms. Which time would represent the beginning of a new time period (in millions of years ago)?