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