Welcome to the Stellar Classification MCQs with Answers. In this post, we are sharing Stellar Classification Multiple Choice Questions and Answers in Astronomy section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Stellar Classification online MCQs Test.
What is the primary basis for the classification of stars?
a) Temperature and color
b) Size and distance
c) Age and luminosity
d) Mass and composition
Which stellar classification system uses letters to denote different spectral types?
a) Hertzsprung-Russell diagram
b) Morgan-Keenan system
c) Messier catalog
d) Schwarzschild classification
What spectral type is associated with the hottest stars?
a) O
b) B
c) A
d) G
Which of the following stars has the coolest surface temperature?
a) K-dwarf
b) A-supergiant
c) F-main sequence
d) O-dwarf
What spectral class is our Sun classified as?
a) G
b) K
c) M
d) F
Which spectral type corresponds to stars with the highest luminosity?
a) M
b) K
c) O
d) B
In stellar classification, what does the letter “M” represent?
a) Main sequence stars
b) White dwarfs
c) Red giants
d) Supergiants
What is the main feature that distinguishes a main sequence star from a giant or supergiant?
a) Surface temperature
b) Luminosity
c) Spectral lines
d) Color
Which spectral type is characterized by strong hydrogen absorption lines?
a) O
b) B
c) A
d) G
What type of stars are classified as “supergiants”?
a) K and M
b) O and B
c) A and F
d) G and K
Which stellar classification is based on the star’s emission lines and not its absorption lines?
a) B
b) O
c) M
d) Wolf-Rayet
What is the classification of a star with a surface temperature of about 5,000 K?
a) A
b) B
c) G
d) M
Which spectral type is associated with blue stars?
a) O
b) K
c) M
d) F
What does the term “luminosity class” indicate in stellar classification?
a) The star’s distance
b) The star’s surface temperature
c) The star’s size and brightness
d) The star’s age
Which stellar class includes stars that are typically over 1,000 times as luminous as the Sun?
a) Red giants
b) White dwarfs
c) Main sequence stars
d) Supergiants
What characteristic feature is used to classify stars as type “B”?
a) Strong helium lines
b) Strong hydrogen lines
c) Weak hydrogen lines
d) Strong metal lines
In the spectral classification of stars, which type is most commonly found on the main sequence?
a) G
b) M
c) O
d) A
Which spectral type includes the coolest stars in terms of surface temperature?
a) O
b) B
c) A
d) M
What does the spectral type “K” generally signify about a star?
a) Intermediate temperature and orange color
b) High temperature and blue color
c) Low temperature and red color
d) High temperature and white color
Which stellar classification involves the use of the Hertzsprung-Russell diagram?
a) Color and luminosity
b) Mass and size
c) Distance and brightness
d) Age and chemical composition
What is the spectral type of a star with strong sodium lines in its spectrum?
a) K
b) M
c) G
d) B
Which spectral type is characterized by the absence of hydrogen lines but strong metal lines?
a) O
b) B
c) A
d) M
What does the spectral type “A” generally indicate about a star’s surface temperature?
a) Hot and blue
b) Cool and red
c) Warm and white
d) Intermediate and orange
What does the luminosity class “IV” indicate about a star?
a) A red giant
b) A supergiant
c) A subgiant
d) A main sequence star
Which type of star is most likely to have a spectrum showing strong lines of both hydrogen and helium?
a) Main sequence star
b) Red giant
c) White dwarf
d) Supergiant
In the Morgan-Keenan system, what does a “dwarf” refer to?
a) Main sequence stars
b) Supergiants
c) Giants
d) White dwarfs
What characteristic does a star of spectral type “B” typically have?
a) Strong absorption lines of hydrogen
b) Strong absorption lines of helium
c) Strong absorption lines of metals
d) Strong emission lines
Which of the following spectral classes includes stars with the highest surface temperatures?
a) O
b) B
c) A
d) F
What does the spectral type “M” generally signify about a star’s color?
a) Blue
b) Yellow
c) Orange to red
d) White
Which spectral type is associated with stars that show strong lines of ionized calcium?
a) G
b) K
c) M
d) B
In stellar classification, what does the “G” spectral type indicate?
a) Stars with intermediate temperatures and yellow color
b) Stars with high temperatures and blue color
c) Stars with low temperatures and red color
d) Stars with very high temperatures and white color
Which type of star is most likely to be found in the main sequence category with a spectral type of “A”?
a) Blue giant
b) Red giant
c) White dwarf
d) Yellow dwarf
What does the presence of strong metal lines in a star’s spectrum indicate?
a) A young star
b) A red giant star
c) An older star
d) A blue supergiant
Which stellar classification involves analyzing the star’s emission lines?
a) Main sequence stars
b) White dwarfs
c) Wolf-Rayet stars
d) Red giants
What does the luminosity class “III” indicate about a star’s classification?
a) A supergiant
b) A giant
c) A main sequence star
d) A white dwarf
Which spectral type is characterized by strong hydrogen and helium lines but no metal lines?
a) O
b) A
c) B
d) M
What does the term “dwarf” signify in the context of stellar classification?
a) Main sequence stars
b) Supergiants
c) Giants
d) White dwarfs
Which of the following is the correct sequence of spectral types from hottest to coolest?
a) O, B, A, F, G, K, M
b) M, K, G, F, A, B, O
c) A, F, G, K, M, B, O
d) B, O, A, F, G, K, M
What characteristic feature distinguishes Wolf-Rayet stars from other types?
a) Strong hydrogen lines
b) Strong helium lines
c) Absence of hydrogen lines
d) Weak metal lines
Which spectral type of star would likely show strong molecular bands in its spectrum?
a) O
b) B
c) M
d) A
In stellar classification, what does a “blue supergiant” refer to?
a) A very hot and luminous star
b) A cool and dim star
c) A medium temperature and luminosity star
d) A red and cool star
Which spectral type is characterized by stars that have strong calcium lines?
a) K
b) M
c) A
d) B
What does the Hertzsprung-Russell diagram plot?
a) Stellar brightness vs. distance
b) Stellar temperature vs. luminosity
c) Stellar mass vs. age
d) Stellar composition vs. size
Which spectral type is associated with stars exhibiting prominent metal lines?
a) O
b) A
c) B
d) M
Which spectral type includes stars that are often red giants or supergiants?
a) G
b) M
c) K
d) B
What is the classification of stars that have a spectral type “G”?
a) Red and cool
b) Yellow and intermediate temperature
c) Blue and very hot
d) White and hot
Which type of stars are most commonly found in the “main sequence” category?
a) White dwarfs
b) Supergiants
c) Red giants
d) Yellow dwarfs
What does the spectral type “B” indicate about a star’s color and temperature?
a) Blue and hot
b) Red and cool
c) Yellow and warm
d) White and intermediate temperature
Which classification system is used to describe the size of stars in addition to their spectral type?
a) Hertzsprung-Russell diagram
b) Morgan-Keenan system
c) Messier catalog
d) LaPlace system
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