- 1. What is the interstellar medium (ISM) primarily composed of?
A) Liquid water
B) Gas and dust
C) Plasma
D) Rock formations
- 2. Which type of electromagnetic radiation is most commonly used to observe the interstellar medium?
A) Gamma rays
B) Radio waves
C) Visible light
D) X-rays
- 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 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) Oxygen
B) Hydrogen
C) Carbon
D) Helium
- 6. What color do reflection nebulae appear to be?
A) Green
B) Yellow
C) Blue
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) Reflection nebulae
C) Supernova remnants
D) H II regions
- 8. What is believed to be a major reservoir of carbon in the interstellar medium?
A) Methane (CH4)
B) Carbon dioxide (CO2)
C) Polycyclic aromatic hydrocarbons (PAHs)
D) Carbon monoxide (CO)
- 9. What is the main component of interstellar dust grains?
A) Gold
B) Silicates
C) Diamonds
D) Platinum
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