Physics ยท Science General

Astronomy and Cosmology

4,450 Questions

This topic provides questions on astronomy, cosmology, and the physical universe. It covers subjects like the Hubble sequence, constellations, dark matter, and stellar evolution. These questions help build a strong foundation for general science exam sections.

Galaxies and clustersConstellations and starsStellar evolutionSpace observatories

Astronomy and Cosmology Questions

Multiple choice

What is the approximate lifespan of a White Dwarf?

  1. Billions of years

  2. Trillions of years

  3. Quadrillions of years

  4. Quintillions of years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White Dwarfs have extremely long lifespans, estimated to be in the trillions of years, as they gradually cool down and fade over time.

Multiple choice

What is the most common type of floater?

  1. Mouches volantes

  2. Asteroid hyalosis

  3. Synchysis scintillans

  4. Weiss ring
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mouches volantes are the most common type of floater. They are small, dark spots or lines that appear in your vision. They are caused by tiny particles that float in the vitreous humor, the gel-like substance that fills the back of your eye.

Multiple choice

What is the name of the classification system developed by Meghnad Saha for emission nebulae?

  1. Hubble Sequence

  2. Yerkes Classification System

  3. Saha Classification System

  4. Morgan-Keenan Classification System
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Meghnad Saha developed the Saha Classification System for emission nebulae, which categorizes them based on their excitation mechanisms and spectral characteristics.

Multiple choice

What is the primary criterion used in the Hubble Sequence for classifying galaxies?

  1. Apparent Magnitude

  2. Spectral Type

  3. Morphological Appearance

  4. Redshift
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Hubble Sequence classifies galaxies based on their morphological appearance, such as elliptical, spiral, and irregular galaxies.

Multiple choice

What is the primary criterion used in the Yerkes Classification System for classifying nebulae?

  1. Apparent Magnitude

  2. Spectral Type

  3. Morphological Appearance

  4. Redshift
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Yerkes Classification System classifies nebulae based on their spectral type, which indicates the presence of specific elements and ionization levels.

Multiple choice

What is the name of the classification system developed by Harinder Singh Ahluwalia for planetary nebulae?

  1. Hubble Sequence

  2. Yerkes Classification System

  3. Saha Classification System

  4. Ahluwalia Classification System
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Harinder Singh Ahluwalia developed the Ahluwalia Classification System for planetary nebulae, which categorizes them based on their morphological characteristics and ionization levels.

Multiple choice

What is the primary criterion used in the Morgan-Keenan Classification System for classifying stars?

  1. Apparent Magnitude

  2. Spectral Type

  3. Morphological Appearance

  4. Redshift
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Morgan-Keenan Classification System classifies stars based on their spectral type, which indicates the presence of specific elements and ionization levels.

Multiple choice

What is the name of the classification system developed by Meghnad Saha for galaxies?

  1. Hubble Sequence

  2. Yerkes Classification System

  3. Saha Classification System

  4. Morgan-Keenan Classification System
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Meghnad Saha developed the Saha Classification System for galaxies, which categorizes them based on their morphological characteristics and spectral properties.

Multiple choice

Which constellation is known for its distinctive "W" shape?

  1. Cassiopeia

  2. Gemini

  3. Ursa Major

  4. Orion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cassiopeia is a constellation in the northern hemisphere known for its distinctive "W" or "M" shape.

Multiple choice

What is the name of the brightest star in the night sky?

  1. Sirius

  2. Vega

  3. Polaris

  4. Betelgeuse
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sirius, also known as the "Dog Star," is the brightest star in the night sky as seen from Earth.

Multiple choice

Which constellation is home to the famous "Big Dipper" asterism?

  1. Ursa Major

  2. Ursa Minor

  3. Draco

  4. Cepheus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ursa Major, also known as the "Great Bear," is home to the "Big Dipper," a prominent asterism that resembles a ladle or a dipper.

Multiple choice

What is the name of the closest star system to our solar system?

  1. Alpha Centauri

  2. Proxima Centauri

  3. Barnard's Star

  4. Wolf 359
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Proxima Centauri, part of the Alpha Centauri system, is the closest star system to our solar system, located just 4.2 light-years away.

Multiple choice

Which constellation is known for its distinctive belt of three bright stars?

  1. Orion

  2. Taurus

  3. Gemini

  4. Leo
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Orion is a prominent constellation known for its belt of three bright stars, Alnitak, Alnilam, and Mintaka, which are often referred to as "Orion's Belt."

Multiple choice

What is the name of the largest constellation in the night sky?

  1. Hydra

  2. Ursa Major

  3. Virgo

  4. Centaurus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydra is the largest constellation in the night sky, covering an area of over 1300 square degrees.

Multiple choice

Which constellation is home to the "North Star," Polaris?

  1. Ursa Major

  2. Ursa Minor

  3. Draco

  4. Cepheus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ursa Minor, also known as the "Little Bear," is home to Polaris, the "North Star," which is currently the closest star to the Earth's North Pole.