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