Tag: the universe

Quizzes (16) Questions (28)

Questions Related to the universe

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

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

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

Multiple choice physics the universe types of galaxies galaxies constellations

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

  1. the Oort cloud

  2. the Kuiper belt

  3. Saturn's ring

  4. Halley's comet

  5. the red shift of distant galaxies
Reveal answer Fill a bubble to check yourself
E Correct answer
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 .

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

Cosmic or galactic year is :

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

Multiple choice physics the universe types of galaxies galaxies constellations

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

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

  2. $250\ km/s$ 

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

  4. $2.5\ km/s$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.