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