Tag: galaxies

Questions Related to galaxies

Galaxies are categorized on basis of their shape which includes:

physics the universe types of galaxies galaxies constellations

  1. spiral shape galaxies

  2. elliptical galaxies

  3. irregular galaxies

  4. all of above

Show answer
Correct Option: D
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 $D$

Identify which of the following is not true according to the Big Bang Theory?

physics the universe types of galaxies galaxies constellations

  1. Our universe is spreading out over time.

  2. As energy cooled down over time, particles were able to form matter.

  3. Our universe is becoming more compact over time.

  4. All energy was confined in some point from which the explosion occurred.

  5. Energy began to spread out a long time ago.

Show answer
Correct Option: C
Explanation:

According to the Big Bang Theory, the universe started as energy concentrated at a single point, and spread out with time and cooled as it did to form matter from the energy that is possessed, creating lighter particles initially and forming heavier elements and molecules later. The age of the universe is around 13.82 billion years, which is the time there has been for the universe spreading.

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

physics the universe types of galaxies galaxies constellations

  1. 2 billion

  2. 100 billion

  3. 10000 billion

  4. 1000000 billion

Show answer
Correct Option: B
Explanation:
Besides our own galaxy, there are about 100 billion other galaxies scattered all over the universe.
Its a fact.

State whether true or false:

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

physics the universe types of galaxies galaxies constellations

  1. True

  2. False

Show answer
Correct Option: A
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.

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

physics the universe types of galaxies galaxies constellations

  1. Milky way galaxy

  2. Andromeda galaxy

  3. Cartwheel galaxy

  4. Sunflower galaxy

Show answer
Correct Option: A
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.

Fill in the blank:

Milky Way is a __________.

physics the universe types of galaxies galaxies constellations

  1. spiral galaxy

  2. irregular galaxy

  3. elliptical galaxy

  4. quasar

Show answer
Correct Option: A
Explanation:
When looked from top or bottom, Milky Way looks in spiral shape. Hence correct option is A.

State whether true or false:

Our solar system belongs to Seyfert galaxy. 

physics the universe types of galaxies galaxies constellations

  1. True

  2. False

Show answer
Correct Option: B
Explanation:
The Milky Way is the galaxy that contains our solar system.

Fill in the blank:

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

physics the universe types of galaxies galaxies constellations

  1. galaxies

  2. nebula

  3. plutons

  4. stellar

Show answer
Correct Option: A
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.

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

geography night sky types of galaxies galaxies constellations

  1. $Constellation$

  2. $Saptrishi$

  3. $Planet$

  4. $Satellite$

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Correct Option: A

Astronomers have observed a small massive object at the centre of our Milky Way galaxy. A ringof material orbits this massive object; the ring has a diameter of about 15 light years and an orbital  speed of 200$\mathrm { km } / \mathrm { s }$ . What is the mass of the massive object at the centre of the minky  Way? Given $G = 6.67 \times 10 ^ { - 11 } \mathrm { Nm } ^ { 2 } \mathrm { kg } ^ { 2 }$ and 1 light year $= 9.5 \times 10 ^ { 15 } \mathrm { m }$ 

physics sky vision types of galaxies galaxies constellations

  1. Approximately $8.1 \times 10 ^ { 37 } \mathrm { kg }$

  2. approximately $4.3 \times 10 ^ { 37 } \mathrm { kg }$

  3. Approximately $6 \times 10 ^ { 37 } \mathrm { kg }$

  4. approximately $3 \times 10 ^ { 37 } \mathrm { kg }$

Show answer
Correct Option: B