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