Astronomy/Astrophysics/Cosmology Practice Questions

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

Our Sun will end its life by becoming

a white dwarf

......... have the most energetic photons

gamma rays

A massive star undergoes spectacular explosion during its evolution because

its iron core becomes unstable

A neutron star is

left behind after a supernova explosion.

The cosmic microwave background radiation is

leftover radiation from the original Big Bang that has since had its wavelength tremendously redshifted by the expansion of the universe.

Among protons, electrons, neutrons and neutrinos, the most massive are

protons

......... have the longest wavelength

radio waves

The dominant force acting between protons and neutrons in an iron atom is

strong force

The cosmic background radiation is

the electromagnetic remnants of the Big Bang

Light Year is the unit of

Distance

Approximately, there are ....... number of galaxies in our Universe.

200 Billion

The distance from the center of our Galaxy to the Sun is

25,000 ly

What is the first exoplanet planet discovered around a Solar type star?

51 Pegasi b

Which is closest galaxy to the Milky Way Galaxy?

Andromeda

At what time in the history of the Universe were all four fundamental forces of Nature unified?

During the Big Bang and shortly after.

How spacetime warps as a single entity is the finding of....

General Theory of Relativity

As predicted by the General theory of Relativity, which of the waves were recently detected by observation?

Gravitational waves

The force that was first to split from the others was

Gravity

The interstellar medium constitutes the highest composition of

Hydrogen

What are the three fundamental results of Special Theory of Relativity

Length contraction, Time dilation, Mass increment

What significant event occurred at about 300,000 years after the Big Bang?

Matter and radiation separated.

The Nearest star from Earth is

Proxima Centauri

The main components of the thin disk of our Galaxy are:

central bulge, central black hole and spiral arms.

The weak force is responsible for

certain radioactive decays such as the decay of a neutron into a proton, electron and antineutrino

The dimensions of the thin disk of our Galaxy are:

diameter 100,000 ly and thickness 2,000 ly.

Positron is the anti-particle of

electron

The strong force is responsible for

holding protons and neutrons together inside nuclei.

In cosmology, the inflationary epoch is called

the time when the Universe expanded very rapidly


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