GED Science Test #5 3 — Questions and Answers
Question 1: Which of these correctly describes the relationship between wavelength and frequency for electromagnetic waves?
- As wavelength increases, frequency decreases (Correct answer)
- As wavelength increases, frequency increases
- Wavelength and frequency are unrelated
- Both increase together at the same rate
Correct answer: As wavelength increases, frequency decreases
For electromagnetic waves traveling at a constant speed (speed of light), wavelength and frequency are inversely proportional: c = λf. Longer wavelengths mean lower frequencies.
Question 2: In genetics, a trait that is hidden when a dominant trait is present is called:
- Recessive (Correct answer)
- Codominant
- Polygenic
- Epistatic
Correct answer: Recessive
A recessive trait is only expressed when an organism has two copies of the recessive allele (homozygous recessive). When paired with a dominant allele, the dominant trait is expressed.
Question 3: Earth's revolution around the sun takes approximately:
- 365.25 days (Correct answer)
- 24 hours
- 28 days
- 687 days
Correct answer: 365.25 days
Earth completes one revolution (orbit) around the sun in approximately 365.25 days — one year. The extra 0.25 days accumulate, which is why we have a leap year every 4 years.
Question 4: A scientist graphs her experimental data and the result is a straight line with a positive slope. This indicates:
- A direct (positive) linear relationship between the variables (Correct answer)
- An inverse relationship between the variables
- No relationship between the variables
- A cause-and-effect relationship has been proven
Correct answer: A direct (positive) linear relationship between the variables
A straight line with a positive slope shows a direct linear relationship — as one variable increases, the other also increases proportionally. Correlation does not prove causation.
Question 5: Which process describes the movement of water molecules from an area of high concentration to an area of low concentration through a semi-permeable membrane?
- Osmosis (Correct answer)
- Diffusion
- Active transport
- Endocytosis
Correct answer: Osmosis
Osmosis specifically describes the diffusion of water molecules across a semi-permeable membrane. Regular diffusion refers to the movement of any substance from high to low concentration.
Question 6: The atomic number of an element equals:
- The number of protons in the nucleus (Correct answer)
- The number of neutrons in the nucleus
- The total mass of the atom
- The number of electrons in the outer shell
Correct answer: The number of protons in the nucleus
The atomic number is the number of protons in the nucleus, which defines the element. For a neutral atom, the number of protons equals the number of electrons.
GED Science Test #5 3
Which of these correctly describes the relationship between wavelength and frequency for electromagnetic waves?