GED Science 3

Question 1

During which type of nuclear reaction is energy released by combining light atomic nuclei?

Accepted Answer

Nuclear fusion

Answer

Nuclear fusion releases energy by combining (fusing) light nuclei like hydrogen into heavier nuclei like helium. This is the process that powers stars including our Sun.

Question 2

What is the relationship between wavelength and frequency of an electromagnetic wave?

Accepted Answer

They are inversely proportional — as wavelength increases, frequency decreases

Answer

All electromagnetic waves travel at the speed of light (c). Since c = λf, wavelength (λ) and frequency (f) are inversely proportional — longer wavelength means lower frequency.

Question 3

Which describes what happens when a substance changes from liquid to gas without going through the boiling point?

Accepted Answer

Evaporation

Answer

Evaporation is the process by which molecules at the surface of a liquid escape into the gas phase below the boiling point. This occurs because some surface molecules have enough energy to overcome intermolecular forces.

Question 4

In an electric circuit, what is the relationship between voltage (V), current (I), and resistance (R) according to Ohm's Law?

Accepted Answer

V = IR

Answer

Ohm's Law states V = IR: Voltage equals Current times Resistance. This means higher resistance reduces current for a given voltage.

Question 5

Which of the following correctly identifies a balanced chemical equation?

Accepted Answer

2H₂ + O₂ → 2H₂O

Answer

In 2H₂ + O₂ → 2H₂O: Left side has 4H + 2O, right side has 4H + 2O. Atoms are balanced on both sides.

GED Practice Test

GED Practice Test

GED Science 3