Tag: the universe

Questions Related to the universe

The Milky Way Galaxy has 

physics the universe types of galaxies galaxies constellations

  1. elliptical shape

  2. spiral shape

  3. irregular shape

  4. none of these

Show answer
Correct Option: B
Explanation:

Milky Way is spiral in shape.

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

  1. universe

  2. galaxy

  3. constellation

  4. none of the above

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Correct Option: B
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.

According to best estimates today, how old is the universe ?

physics the universe types of galaxies galaxies constellations

  1. between ten and twenty thousand years.

  2. between ten and twenty million years.

  3. between ten and twenty billion years.

  4. between ten and twenty trillion years.

  5. between ten and twenty quadrillion years.

Show answer
Correct Option: C
Explanation:

The age of universe is approximately 13.82 billion years. It is the time that has passes since the Big Bang that started the building of matter, time and space itself. Time had no existence before the Big Bang.
Hence correct answer is option C.

Which of the following provides clear evidence that the universe is expanding ?

physics the universe types of galaxies galaxies constellations

  1. the Oort cloud

  2. the Kuiper belt

  3. Saturn's ring

  4. Halley's comet

  5. the red shift of distant galaxies

Show answer
Correct Option: E
Explanation:

The spectrum of light coming from galaxies have spectral lines of hydrogen ,sodium etc. We compare the spectral lines obtained from galaxy to the spectral lines obtained in laboratory of the same element .If the spectral lines of galaxy are shifted towards the red end of the spectrum (red shift) it means the galaxy is going away from earth . This implies that universe is expanding .This is one of the applications of Doppler's effect .

Community or collection of stars is called:

physics the universe types of galaxies galaxies constellations

  1. solar system

  2. galaxy

  3. planet

  4. milky way

Show answer
Correct Option: B
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.

The galaxies are usually classified on the basis of their:

physics the universe types of galaxies galaxies constellations

  1. Mass

  2. Size

  3. Shape

  4. Any one of the above

Show answer
Correct Option: C
Explanation:

Galaxies are defined on the basis of their shape.

A family of stars is called a

physics the universe types of galaxies galaxies constellations

  1. galaxy

  2. solar system

  3. universe

  4. whirling havens

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Correct Option: A
Explanation:

The family of a star is called a galaxy.

Cosmic or galactic year is :

physics the universe types of galaxies galaxies constellations

  1. year in which a comet arrives.

  2. period taken by Earth to revolve around the Sun.

  3. year in which total solar eclipse occurs.

  4. period of Sun's revolution around galactic centre.

Show answer
Correct Option: D
Explanation:

The galactic year, also known as a cosmic year, is the duration of time required for the solar system to orbit once around the center of the Milky Way galaxy. The length of one orbit range from 225 to 250 million terrestrial years.
The solar system is traveling at an average speed of 828,000 km/h or 514,000 mph within its trajectory around the galactic center, which is about one 1300th of the speed of light speed at which an object could circumnavigate the Earth's equator in 2 minutes and 54 seconds.

Fill in the blank:

Stars in a galaxy are held together by ______.

physics the universe types of galaxies galaxies constellations

  1. light

  2. gravity

  3. radiation

  4. satellites

Show answer
Correct Option: B
Explanation:
A galaxy is a large assembly of stars, gas, and dust, held together by the force of gravity.

Solar system revolves around the Milky Way galaxy with the speed of:

physics the universe types of galaxies galaxies constellations

  1. $2.5$ $\text{light years} / s$

  2. $250\ km/s$ 

  3. $250\ \text{light years} / s$

  4. $2.5\ km/s$

Show answer
Correct Option: B
Explanation:
The Solar System is travelling at an average speed of $250\ km/s$ on its trajectory around the galactic center.
The Earth belongs to Milky Way galaxy.