Question 1. According to the paragraph, what is dark matter thought to be made of?
A) Ordinary matter
B) Electromagnetic radiation
C) Undiscovered subatomic particles
D) A form of energy known as dark energy
Question 2. According to the paragraph, what is the primary evidence for the existence of dark matter?
A) Direct observations of dark matter particles
B) Calculations showing that many galaxies would behave differently without unseen matter
C) Observations of the cosmic microwave background
D) Modifications of the standard laws of general relativity
Question 3. According to the paragraph, which of the following is NOT true about dark matter?
A) It appears to interact with the electromagnetic field
B) It constitutes 85% of the total mass
C) It is composed of weakly interacting massive particles
D) It is composed of baryonic matter
Question 4. The author mentions all of the following EXCEPT
A) Dark matter constitutes 85% of the total mass
B) Dark energy and dark matter constitute 95% of the total mass-energy content
C) Dark matter is composed of baryonic matter
D) The scientific community generally accepts dark matter's existence
Question 5. Which of the following can be inferred from the paragraph about dark matter?
A) Dark matter can be directly observed.
B) Dark matter has been discovered through experiments.
C) Dark matter is a form of energy.
D) Dark matter interacts only through gravity.