GED Science Test #7 3 — Questions and Answers
Question 1: Which of the following is NOT a function of the human skeletal system?
- Producing insulin (Correct answer)
- Providing structural support
- Protecting internal organs
- Storing calcium minerals
Correct answer: Producing insulin
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:
- A different number of neutrons (Correct answer)
- A different number of protons
- A different number of electrons
- A different atomic number
Correct answer: A different number of neutrons
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:
- Ocean currents that redistribute heat globally (Correct answer)
- An increase in precipitation at the poles
- Reduced evaporation near the equator
- Tidal patterns across all oceans
Correct answer: Ocean currents that redistribute heat globally
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:
- Precise but accuracy depends on the true value (Correct answer)
- Accurate but not precise
- Both accurate and precise
- Neither accurate nor precise
Correct answer: Precise but accuracy depends on the true value
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:
- A heavy nucleus splits into smaller nuclei, releasing energy (Correct answer)
- Two light nuclei combine to form a heavier nucleus
- Electrons are released from excited atoms
- Protons are converted into neutrons
Correct answer: A heavy nucleus splits into smaller nuclei, releasing energy
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.
Question 6: Which process moves substances against a concentration gradient and requires energy?
- Active transport (Correct answer)
- Osmosis
- Diffusion
- Filtration
Correct answer: Active transport
Active transport requires ATP (energy) to move substances from areas of low concentration to high concentration — against the gradient. Diffusion and osmosis are passive processes that require no energy.
GED Science Test #7 3
Which of the following is NOT a function of the human skeletal system?