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