- 1. What is the interstellar medium (ISM) primarily composed of?
A) Rock formations
B) Plasma
C) Liquid water
D) Gas and dust
- 2. Which type of electromagnetic radiation is most commonly used to observe the interstellar medium?
A) Radio waves
B) X-rays
C) Visible light
D) Gamma rays
- 3. What is the process by which interstellar dust grains align themselves with magnetic fields?
A) Ionization imbalance
B) Heat conduction
C) Microwave heating
D) Radiative torque alignment
- 4. What term is used to describe regions in the ISM that contain a higher density of gas and dust?
A) Reflection nebulae
B) H II regions
C) Molecular clouds
D) Supernova remnants
- 5. What is the most abundant element in the interstellar medium?
A) Hydrogen
B) Helium
C) Oxygen
D) Carbon
- 6. What is the main component of interstellar dust grains?
A) Diamonds
B) Silicates
C) Gold
D) Platinum
- 7. What is believed to be a major reservoir of carbon in the interstellar medium?
A) Carbon dioxide (CO2)
B) Carbon monoxide (CO)
C) Polycyclic aromatic hydrocarbons (PAHs)
D) Methane (CH4)
- 8. What color do reflection nebulae appear to be?
A) Green
B) Red
C) Blue
D) Yellow
- 9. What type of gas cloud emits its own light due to ionizing radiation from nearby hot stars?
A) H II region
B) Supernova remnant
C) Reflection nebula
D) Dark nebula
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