- 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) Visible light
B) Gamma rays
C) X-rays
D) Radio waves
- 3. What is the process by which interstellar dust grains align themselves with magnetic fields?
A) Radiative torque alignment
B) Microwave heating
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) Dark nebula
C) H II region
D) Reflection nebula
- 5. What is the most abundant element in the interstellar medium?
A) Hydrogen
B) Helium
C) Oxygen
D) Carbon
- 6. What color do reflection nebulae appear to be?
A) Yellow
B) Green
C) Red
D) Blue
- 7. 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
- 8. What is believed to be a major reservoir of carbon in the interstellar medium?
A) Carbon dioxide (CO2)
B) Carbon monoxide (CO)
C) Methane (CH4)
D) Polycyclic aromatic hydrocarbons (PAHs)
- 9. What is the main component of interstellar dust grains?
A) Diamonds
B) Platinum
C) Gold
D) Silicates
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