QUESTION: 137

An animal population can increase or decrease because of food scarcity or other changes in a habitat. The graph below shows changes in a rabbit population over a 10-year period.
According to the graph,

during which period of time were the numbers of rabbits leaving the population and joining the population about the same?

between 02 years
between 24 years
between 45 years
between 57 years
between 810 years

Answer(s): E

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QUESTION: 138

The gear combination shown below is an example of a simple machine.
The shaft on the large gear can rotate at a certain speed.

How fast will the small gear rotate?

faster than the large gear
slower than the large gear
the same rate as the large gear
the small gear will not rotate
at first faster, then slower

Answer(s): A

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QUESTION: 139

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?

a piece of window glass held up to the Sun
several mirrors, each reflecting light to the same spot
a piece of waxed paper covering a dark circle
several pieces of white plastic arranged in a circle
a bright flashlight shining at a 45-degree angle to the paper

Answer(s): B

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QUESTION: 140

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?

Grease decreases the speed of the axle.
Grease increases friction.
Grease is hot and adds heat.
Grease makes the bearings stick to the axle.
Grease decreases friction.

Answer(s): E

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QUESTION: 137

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QUESTION: 140