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