Physics · Science General

Astronomy and Cosmology

4,498 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 evs - i our earth and our solar system asteroids, comets, and meteors and meteorites other objects in solar system asteroids, comets and meteors
The bright streaks of light seen occasionally in the sky are ________.

  1. planets

  2. satellites

  3. meteors

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

Meteors are small objects that sometimes enter the Earth"s atmosphere. However, due to the high speed of the meteor friction is created between its surface and Earth"s atmosphere causing it to heat up. Thus it glows and evaporates quickly and appears for a very short period of time as a bright streak of light.

Multiple choice evs - i our earth and our solar system asteroids, comets, and meteors and meteorites other objects in solar system asteroids, comets and meteors

Shooting stars are actually not meteors.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Despite its name, shooting stars are not actually stars. Shooting star is either a piece of a small rock or dust from space that heats up when is enters the Earth's atmosphere. Shooting stars are basically meteors.

Multiple choice evs our solar system asteroids, comets, and meteors and meteorites other objects in solar system asteroids, comets and meteors

Why tail of comets is formed ,when it comes closer to sun ?

  1. Ice presents in the comets gets vapourised

  2. When is comes closer to sun ,vapour converts in to ice

  3. Dust particle in the comets gets heated

  4. Water present in comets gets cooled
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The tail of comets so formed, When comets come closer to the sun, because the sun's heat vaporizes some of the comets' material, releasing dust particles that were trapped in the ice.

The correct option is A.

Multiple choice geography night sky types of galaxies galaxies constellations

Which of the following constellation contains the Pole Star?

  1. Ursa Major

  2. Ursa Minor

  3. Pleides

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

Ursa Minor is located at the north celestial pole and contains the famous Little Dipper asterism, with Polaris, the North Star, located at the end of the dipper handle.

Multiple choice physics the universe types of galaxies galaxies constellations
Fill in the blank:
A vast collection of billions of stars is called a _______.

  1. universe

  2. galaxy

  3. constellation

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Galaxy is a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
Earth is is Milky way galaxy.
Multiple choice physics the universe types of galaxies galaxies constellations

Community or collection of stars is called:

  1. solar system

  2. galaxy

  3. planet

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

The solar system is the planetary system, where we live. It consists of the Sun and its planets, including the Earth.

A galaxy is a collection of millions of stars which are bound together to form a specific shape.
Planet is a body which revolves around a star. For eg:- The earth is a planet of the Sun which is a star.
Milky Way is the name of our galaxy. The sun and the earth are in the Milky Way.

Multiple choice physics the universe types of galaxies galaxies constellations

Milky Way is moving in local group of galaxies with a speed of:

  1. $300 \ light\ years \ {s}^{-1}$
  2. $300\ light\ years\ {hr}^{-1}$
  3. $300\ km$ ${s}^{-1}$
  4. $300m$ ${s}^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$Milky \ Way$ moves through space within the cluster of galaxies it is a member of. This cluster, in turn, moves through space towards yet another larger cluster of galaxies off in the direction of the constellation $Virgo$. This speed is approximately $300 km/s.$
Multiple choice physics the universe types of galaxies galaxies constellations

The total mass of all stars in Milky Way galaxy is about:

  1. $2\times {10}^{41}\ kg$
  2. $2\times {10}^{31}\ kg$
  3. $2\times {10}^{21}\ kg$
  4. $2\times {10}^{11}\ kg$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Total mass of stars in the Milky Way galaxy is about $1.9 \times 10^{41}\ kg$ 
or $=2 \times 10^{41}\ kg$.