GED Science Test #7 3

Question 1

Which of the following is NOT a function of the human skeletal system?

Accepted Answer

Producing insulin

Answer

Insulin is produced by the pancreas, not the skeletal system. The skeletal system supports the body, protects organs (e.g., ribs protect lungs), and stores minerals like calcium.

Question 2

An isotope differs from the standard atom of the same element by having:

Accepted Answer

A different number of neutrons

Answer

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. For example, carbon-12 and carbon-14 are both carbon but have different neutron counts.

Question 3

Ocean water near the equator is warmer than ocean water near the poles. This difference drives:

Accepted Answer

Ocean currents that redistribute heat globally

Answer

Temperature differences in ocean water drive thermohaline circulation (ocean currents). Warm water flows toward the poles and cold water flows toward the equator, redistributing heat around the planet.

Question 4

A student measures a table and gets 152.4 cm. A second measurement gives 152.6 cm. These measurements are:

Accepted Answer

Precise but accuracy depends on the true value

Answer

Precision refers to how close repeated measurements are to each other. These measurements are close (152.4 and 152.6 cm), so they are precise. Whether they are accurate depends on the actual length of the table.

Question 5

In a nuclear fission reaction:

Accepted Answer

A heavy nucleus splits into smaller nuclei, releasing energy

Answer

Nuclear fission involves splitting a heavy nucleus (like uranium-235) into smaller fragments, releasing large amounts of energy. This is the principle behind nuclear power plants and atomic bombs.

GED Practice Test

GED Practice Test

GED Science Test #7 3