Tag: galaxies

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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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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&nbsp;<span>galaxy</span>

  3. Cartwheel&nbsp;<span>galaxy</span>

  4. Sunflower&nbsp;<span>galaxy</span>
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</span>
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 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.

Multiple choice physics sky vision types of galaxies galaxies constellations

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 $= 9.5 \times 10 ^ { 15 } \mathrm { m }$ 

  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 $3 \times 10 ^ { 37 } \mathrm { kg }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using the formula for orbital velocity v = sqrt(GM/r), where r is the radius (half the diameter) and v is the speed, we can solve for M. Given diameter = 15 light years (r = 7.5 light years), v = 200,000 m/s, and the constants, the calculation yields approximately 4.3 x 10^37 kg.