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