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