- 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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