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 name of the technique used to measure the rotation period of stars?

  1. Astrometry

  2. Photometry

  3. Spectroscopy

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

Photometry is the technique used to measure the rotation period of stars.

Multiple choice

What is the name of the technique used to measure the activity level of stars?

  1. Astrometry

  2. Photometry

  3. Spectroscopy

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

Photometry is the technique used to measure the activity level of stars.

Multiple choice

What is the name of the technique used to measure the binarity of stars?

  1. Astrometry

  2. Photometry

  3. Spectroscopy

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

Astrometry is the technique used to measure the binarity of stars.

Multiple choice

What was the primary focus of M.K. Vainu Bappu's research on planetary nebulae?

  1. Their chemical composition

  2. Their physical properties

  3. Their relationship to stars

  4. Their astrological significance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

M.K. Vainu Bappu's research on planetary nebulae focused on their physical properties, such as their temperature, density, and expansion velocities.

Multiple choice

What was the primary focus of Subrahmanyan Chandrasekhar's research on extragalactic nebulae?

  1. Their chemical composition

  2. Their physical properties

  3. Their relationship to stars

  4. Their astrological significance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Subrahmanyan Chandrasekhar's research on extragalactic nebulae focused on their physical properties, such as their mass, luminosity, and structure.

Multiple choice

What was the primary focus of Harish-Chandra's research on the Magellanic Clouds?

  1. Their chemical composition

  2. Their physical properties

  3. Their relationship to stars

  4. Their astrological significance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Harish-Chandra's research on the Magellanic Clouds focused on their physical properties, such as their mass, luminosity, and structure.

Multiple choice

What is the primary observational technique used by Indian astronomers to study dark energy?

  1. Gravitational lensing

  2. Supernovae observations

  3. Cosmic microwave background measurements

  4. Galaxy redshift surveys
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Indian astronomers primarily employ galaxy redshift surveys to measure the expansion history of the universe and infer the properties of dark energy.

Multiple choice

What is the name of the supermassive black hole at the center of our galaxy, the Milky Way?

  1. Cygnus X-1

  2. Sagittarius A*

  3. M87*

  4. V404 Cygni
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sagittarius A* is the name of the supermassive black hole at the center of our galaxy, the Milky Way.

Multiple choice

What is the primary mechanism responsible for the formation of White Dwarfs?

  1. Nuclear Fusion

  2. Gravitational Collapse

  3. Supernova Explosion

  4. Planetary Nebula Formation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White Dwarfs are formed when stars of low to intermediate mass exhaust their nuclear fuel and undergo gravitational collapse, leading to the expulsion of their outer layers.

Multiple choice

What is the typical mass range of a White Dwarf?

  1. 0.1 - 1.4 Solar Masses

  2. 1.4 - 3 Solar Masses

  3. 3 - 8 Solar Masses

  4. 8 - 15 Solar Masses
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

White Dwarfs typically have masses ranging from 0.1 to 1.4 Solar Masses, which is the Chandrasekhar Limit, beyond which they undergo further collapse to form Neutron Stars or Black Holes.

Multiple choice

What is the typical size of a White Dwarf?

  1. Similar to Earth

  2. Similar to Jupiter

  3. Similar to Sun

  4. Smaller than Earth
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

White Dwarfs are incredibly dense, with masses comparable to the Sun but compressed into a volume similar to Earth or even smaller.

Multiple choice

What is the primary energy source of a White Dwarf?

  1. Nuclear Fusion

  2. Gravitational Energy

  3. Thermal Radiation

  4. Magnetic Field Energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

White Dwarfs primarily emit energy through thermal radiation, as they have exhausted their nuclear fuel and rely on their residual heat to sustain their luminosity.

Multiple choice

What is the phenomenon observed when a White Dwarf accretes material from a companion star?

  1. Novae

  2. Supernovae

  3. Neutron Star Collisions

  4. Black Hole Formation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a White Dwarf accretes material from a companion star, it can undergo a sudden outburst, known as a Nova. This occurs due to the release of energy as the accreted material undergoes nuclear fusion on the surface of the White Dwarf.

Multiple choice

What is the term used to describe a binary system consisting of a White Dwarf and a Red Giant?

  1. Cataclysmic Variable

  2. Novae System

  3. Symbiotic Binary

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

A binary system consisting of a White Dwarf and a Red Giant is known as a Cataclysmic Variable. These systems are characterized by periodic outbursts due to the transfer of mass from the Red Giant to the White Dwarf.

Multiple choice

What is the name of the first discovered White Dwarf?

  1. Sirius B

  2. Procyon B

  3. 40 Eridani B

  4. Groombridge 1830
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The first discovered White Dwarf was Sirius B, the companion star to the brightest star in the night sky, Sirius. It was identified as a White Dwarf in 1862 by the American astronomer Alvan Graham Clark.