GED Science Test #9 3

Question 1

Which statement best describes the difference between a food chain and a food web?

Accepted Answer

A food chain shows one path of energy flow, while a food web shows multiple interconnected paths

Answer

A food chain shows a linear sequence of who eats whom. A food web is more realistic — it shows the complex, interconnected feeding relationships among many organisms in an ecosystem.

Question 2

The element with atomic number 6 is carbon. How many electrons does a neutral carbon atom have?

Accepted Answer

6

Answer

A neutral atom has the same number of electrons as protons. Since carbon has an atomic number of 6 (6 protons), it also has 6 electrons in its neutral state.

Question 3

Scientists have found similar fossilized organisms on continents that are now separated by oceans. This evidence supports the theory of:

Accepted Answer

Continental drift (plate tectonics)

Answer

Matching fossils on separated continents provide evidence that those landmasses were once connected. This supports the theory of continental drift, showing that today's continents were once part of a single supercontinent (Pangaea).

Question 4

Which type of electromagnetic radiation has the highest frequency?

Accepted Answer

Gamma rays

Answer

The electromagnetic spectrum, ordered from lowest to highest frequency: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays. Gamma rays have the highest frequency and most energy.

Question 5

When a ball is thrown upward, at the highest point, the ball's:

Accepted Answer

Velocity is zero but acceleration due to gravity continues downward

Answer

At the highest point, the ball momentarily stops (velocity = 0), but gravity (9.8 m/s² downward) still acts on it. This is why the ball then falls back down — gravity never stops pulling.

GED Practice Test

GED Practice Test

GED Science Test #9 3