General Science

1.

1 point

Sounds travels fastest through

air.

steel.

water.

a vacuum.

2.

1 point

In order to use water on board ship for boilers, the water must first be

refined.

aerated.

distilled.

chlorinated.

3.

1 point

The most abundant metal in a free state in the Earth's crust is

copper.

iron.

aluminum.

nitrogen.

4.

1 point

An object will most effectively absorb the sun's rays if it is

rough, and dark in color.

polished, and light in color.

rough, and light in color.

polished, and dark in color.

5.

1 point

The most effective farming method for returning minerals to the soil is

contour plowing.

furrowing.

crop rotation.

strip farming.

6.

1 point

An example of a lever is

the crowbar.

the escalator.

the wedge.

the saw.

7.

1 point

A lunar eclipse occurs when the

earth casts its shadow on the sun.

earth casts its shadow on the moon.

sun casts its shadow on the moon.

moon casts its shadow on the earth.

8.

1 point

The part of the body that would suffer the most from a diet deficient in calcium is the

stomach.

skin.

pancreas.

skeleton.

9.

1 point

Which of the following is found in greatest quantities in automobile exhaust gases?

sulfur dioxide

carbon monoxide

sulfur trioxide

water

10.

1 point

Which common electrical device contains an electric magnet?

toaster

telephone

flatiron

lamp

11.

1 point

In a vacuum, radio waves and visible light waves must have the same

wavelength.

frequency.

speed.

intensity.

12.

1 point

The most accurate description of the earth's atmosphere is that it consists

entirely of ozone, nitrogen, and water vapor.

of a mixture of gases, liquid droplets, and minute solid particles.

of gases which cannot be compressed.

mostly of oxygen, argon, carbon dioxide, and water vapor.

13.

1 point

Object A with a mass of 2 kilograms and object B with a mass of 4 kilograms are dropped simultaneously from rest near the surface of the earth. Neglecting air resistance, at the end of 3 seconds, what is the ratio of the speed of object A to the speed of object B?

2:1

1:1

1:2

1:4

14.

1 point

In June, a weather station in a New England city reports a falling barometer and winds coming out of the southeast. The best weather forecast is probably

fair and warmer.

rain and warmer.

rain and colder.

fair and colder.

15.

1 point

Which substance can be removed from water by filtration?

sand

alcohol

ink

sugar

16.

1 point

As a balloon rises, the gas within it

solidifies.

condenses.

freezes.

expands.

17.

1 point

The best estimate of the age of the earth comes from the study of

radioactive material.

the salt content of the oceans.

the thickness of sedimentary rock.

the rate of erosion of the land.

18.

1 point

The presence of coal deposits in Alaska shows that, at one time, Alaska

was covered with ice.

had a tropical climate.

was connected to Europe.

was connected to Asia.

19.

1 point

When an airplane is in flight, the air pressure on the top surface of the wing is

the same as on the bottom surface.

less than on the bottom surface.

more or less than on the bottom surface, depending on the shape of the wing.

slightly more than on the bottom surface.

20.

1 point

In the human eye, which structure is like the film in a camera?

pupil

cornea

retina

lens

21.

1 point

When water is taken apart by electricity, what two substances are formed?

hydrogen and nitrogen

carbon and oxygen

hydrogen and oxygen

oxygen and nitrogen

22.

1 point

Compounds are created when

two or more molecules are combined.

a molecule decomposes.

atoms of two or more like elements are combined.

atoms of two or more different elements are combined.

23.

1 point

The three elements found most commonly in commercial fertilizers are

nitrogen, phosphorous, potassium.

magnesium, iron, calcium.

calcium, phosphorous, iron.

phosphorous, nitrogen, sulfur.

24.

1 point

Two non-porous rocks seem to lose the same weight when a string is attached to each and they are submerged in water. These two rocks must have the same

volume.

weight in water.

weight in air.

chemical and physical properties.

25.

1 point

The thermos bottle is most similar in principle to

radiant heaters.

the freezing unit in an electric refrigerator.

storm windows.

solar heating systems.