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 physics the universe types of galaxies galaxies constellations

Fill in the blank:

If $V$ is the velocity of a receding galaxy and $R$ is the distance of the galaxy from the Earth. Then the relation between $V$ and $R$ is _______ .

  1. $V \propto \displaystyle\frac{1}{R}$
  2. $V \propto {R}^{2}$
  3. $V \propto R$
  4. $V \propto \displaystyle\frac{1}{{R}^{2}}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As per Hubble Expansion Law, $H=\displaystyle \frac{V}{R}$,

where $H$ is Hubble constant. 
So, $V \propto R$.

Multiple choice physics the universe types of galaxies galaxies constellations

The distance between the galaxy Andromeda and Earth is ________ light years.

  1. $2 \times {10}^{6}$
  2. $3 \times {10}^{8}$
  3. $22 \times {10}^{16}$
  4. $12 \times {10}^{8}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Distance between galaxy Andromeda and Earth is $2\times { 10 }^{ 6 }$

Ans : $2\times { 10 }^{ 6 }$
 

Multiple choice physics the universe types of galaxies galaxies constellations

Galaxies are categorized on basis of their shape which includes:

  1. spiral shape galaxies

  2. elliptical galaxies

  3. irregular galaxies

  4. all of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Galaxies are innumerous in the earth and are described by various shape which include irregular shape, spiral shape, eliptical shape and barred. 

Answer is $D$

Multiple choice physics the universe types of galaxies galaxies constellations

Besides our own galaxy there are about ______ other galaxies scattered all over the universe.

  1. 2 billion

  2. 100 billion

  3. 10000 billion

  4. 1000000 billion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Besides our own galaxy, there are about 100 billion other galaxies scattered all over the universe.
Its a fact.
Multiple choice physics the universe types of galaxies galaxies constellations

State whether true or false:

Milky Way is a family of stars, with dust and hydrogen, to which our Sun belongs.

  1. True

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

A galaxy is vast collection of stars, dust and hydrogen gas. The solar system, our own Sun and its family or its family of planets belongs to a particular galaxy known as the Milky Way. In this way, our Sun and its family members constitute a small fraction of the galaxy.
Hence, the statement is true.

Multiple choice physics the universe types of galaxies galaxies constellations

The spiral and disc shaped galaxy in which, our solar system is located is named -

  1. Milky way galaxy

  2. Andromeda galaxy

  3. Cartwheel galaxy

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

Our solar system is a part of the Milky way galaxy which is one of the numerous galaxies in the universe. Its name "milky" is derived from its appearance as a dim glowing band arching across the night sky in which the naked eye cannot distinguish individual stars.

Multiple choice physics the universe types of galaxies galaxies constellations

Fill in the blank:

The billions of stars which occur in the form of groups or clusters are commonly called _______ .

  1. galaxies

  2. nebula

  3. plutons

  4. <span class="st">stellar
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction is galaxy.
The galaxy of which the solar system is a part; the Milky Way.
Multiple choice

Why do variable stars pulsate in brightness?

  1. Gain in mass

  2. Expansion & contraction of the outer layers

  3. Constant contraction

  4. Movement at a fixed rate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Variable stars, such as Cepheid variables, pulsate because of the periodic expansion and contraction of their outer layers, which is driven by changes in opacity and temperature.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

All images from Hubble are ___________________,in which its cameras incorporate a variety of filters each sensitive to specific wavelengths of light.

  1. advanced diffracted

  2. monochromatic grayscale

  3. Lucky Cam

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All images from Hubble are monochromatic gray scale, in which its cameras incorporate a variety of filters each sensitive to specific wavelengths of light.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

The GHRS was a spectrograph designed to operate in the ___________.

  1. infrared

  2. ultraviolet

  3. visible

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The GHRS was a spectrograph designed to operate in ultraviolet light. It was installed on the Hubble Space Telescope during its original constructing and it was launched into space as a part of the space telescope abroad the space shuttle on April 24,1990.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Hubble's four main instruments observe in the near

  1. ultraviolet range

  2. infrared range.

  3. red wavelength range

  4. yellow wavelength range
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

The instruments of hubble that analyses light from the universe such as cameras, spectrographs and inter ferometers helps in observing the near UV (ultraviolet range) to IR (infrared range).

Multiple choice geography night sky types of galaxies galaxies constellations

A group of stars that appear to form a pattern in the sky is known as a _____. 

  1. $Constellation$
  2. $Saptrishi$
  3. $Planet$
  4. $Satellite$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A constellation is a group of stars that appear to form a recognizable pattern or shape in the night sky as viewed from Earth.