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