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Interstellar Medium ISM
The quiz on Interstellar Medium (ISM) is a comprehensive 50-question assessment designed to evaluate a wide range of concepts. It is structured into three sections: multiple-choice questions, fill-in-the-blank questions, and true/false questions. Here’s a breakdown:
1 / 50
Transitions between different rotational / vibrational /bending energy levels lead to emission – typically atradio wavelengths. Stretching of the molecular bondsleads to the absorption features in the near infrared.
2 / 50
Stars form in the dense regions of molecular clouds.
3 / 50
Reflection nebulae are primarily caused by ionized hydrogen gas.
4 / 50
21-cm radiation is produced by molecular hydrogen (H₂).
5 / 50
Emission nebulae appear blue because of the scattering of blue light.
6 / 50
The ISM is completely empty and contains no dust.
7 / 50
The distance modulus formula allows astronomers to determine the ______ to stars.
8 / 50
Interstellar reddening is caused by the scattering of ______ light more than red light.
9 / 50
Dark nebulae are regions in the ISM that obscure ______ from stars behind them.
10 / 50
The ISM consists of gas, dust, and ______ fields.
11 / 50
In astronomy, the term ______ refers to the process where starlight is dimmed as it passes through the ISM.
12 / 50
The most common elements in the ISM are hydrogen and ______.
13 / 50
The cumulative effect of scattering and absorption by dust in the ISM is called ______.
14 / 50
The coronal gas in the ISM has a temperature of around ______ K.
15 / 50
_____ are large clouds of gas and dust where stars are born.
16 / 50
A reflection nebula appears blue because it scatters ______ light more effectively.
17 / 50
The ISM affects starlight through two main processes: ______ and ______.
18 / 50
Molecular clouds typically have temperatures of around ______ K.
19 / 50
The wavelength of radiation produced by neutral hydrogen in the ISM is ______ cm.
20 / 50
The most common molecule in molecular clouds is ______.
21 / 50
Which of the following is true about interstellar molecules?
22 / 50
What process allows us to estimate the distance to stars using their apparent and absolute magnitudes?
23 / 50
How does interstellar reddening affect our view of distant stars?
24 / 50
Which type of cloud is the coolest in temperature?
25 / 50
The ISM contains which of the following?
26 / 50
How is interstellar dust most effectively observed?
27 / 50
What is a ‘Giant Molecular Cloud’ (GMC)
28 / 50
Where do molecular clouds tend to survive?
29 / 50
How are the interstellar absorption lines formed?
30 / 50
What is the dominant element in coronal gas?
31 / 50
What type of ISM is observed using UV light?
32 / 50
What is the primary source of coronal gas in the ISM?
33 / 50
Which part of the ISM produces strong X-ray emissions?
34 / 50
What type of nebula appears dark in front of a brighter background?
35 / 50
The ISM plays a role in star formation primarily in:
36 / 50
Which of the following is NOT a characteristic of reflection nebulae?
37 / 50
What happens to blue light as it passes through an interstellar cloud?
38 / 50
Which radiation passes through interstellar dust clouds without being affected?
39 / 50
Which type of scattering is responsible for the blue color of the sky?
40 / 50
What causes dark nebulae to appear dark?
41 / 50
Which of the following molecules is the most common in molecular clouds?
42 / 50
The ISM between stars is mostly composed of:
43 / 50
What is the significance of the 21-cm line in astronomy?
44 / 50
In an emission nebula, what causes the gas to glow?
45 / 50
What type of nebula is created when dust scatters starlight?
46 / 50
What is the temperature range of molecular clouds in the ISM?
47 / 50
What type of radiation allows us to study neutral hydrogen in the ISM?
48 / 50
Which phenomenon explains why distant stars appear redder?
49 / 50
What is the main element that constitutes about 70% of the ISM’s mass?
50 / 50
What is the primary component of the Interstellar Medium?
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