- 1. What is the interstellar medium (ISM) primarily composed of?
A) Plasma
B) Rock formations
C) Liquid water
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) Microwave heating
B) Radiative torque alignment
C) Ionization imbalance
D) Heat conduction
- 4. What color do reflection nebulae appear to be?
A) Red
B) Green
C) Yellow
D) Blue
- 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) Reflection nebulae
D) Molecular clouds
- 6. What is the most abundant element in the interstellar medium?
A) Carbon
B) Oxygen
C) Hydrogen
D) Helium
- 7. What type of gas cloud emits its own light due to ionizing radiation from nearby hot stars?
A) Dark nebula
B) Reflection nebula
C) Supernova remnant
D) H II region
- 8. What is the main component of interstellar dust grains?
A) Diamonds
B) Silicates
C) Platinum
D) Gold
- 9. 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)
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