Physics · General Awareness

Astrophysics and Cosmology

1,746 Questions

Delve into the mysteries of the universe with questions on black holes, gravitational waves, and spacetime concepts. Topics include the event horizon, the LIGO experiment, and mathematical techniques used in Twistor Theory. These advanced physics concepts are frequently tested in science optional papers.

Black hole physicsGravitational waves and lensingGeneral relativity principlesElectromagnetic spectrum regionsCosmological phenomena

Astrophysics and Cosmology Questions

Multiple choice

What is a black hole made from?

  1. dead stars

  2. stars that are to bright

  3. the sun

  4. the moon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stellar-mass black holes are formed from the remnants of dead, massive stars that have collapsed.

Multiple choice

What do the letters SMBH stand for?

  1. Super Massive Black Hole

  2. Severe Micro Black Hole

  3. Shake My Boy's Hand

  4. Super Man's Bald Head
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

SMBH is the standard scientific acronym for Supermassive Black Hole.

Multiple choice physics gravitational fields representing a gravitational field gravitational field circular motion and gravitation

The speed at which the gravitational field propagates is

  1. Equal to the speed of light in vacuum

  2. Less than the speed of light in vacuum

  3. More than the speed of light in vacuum

  4. Either less or more than the speed of light in

    vacuum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The speed of gravitational waves in the general theory of relativity is equal to the speed of light in vacuum.

Multiple choice physics gravitational fields representing a gravitational field gravitational field circular motion and gravitation

A gravitational field is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The gravitational field is the actually the force experimented by a unit mass due to a body of mass M.
  • So when a unit mass is kept at a distance 'r' from mass 'M' then it experiences a force which is equal to $\dfrac{GM}{r^2}$[as m=1],which is nothing but the gravitational field of mass M.
  • Its units are $\dfrac{N}{kg}$
  • Hence the above statement is true.
Multiple choice

What is a black hole?

  1. A region of spacetime where gravity is so strong that nothing, not even light, can escape

  2. A region of spacetime where gravity is so weak that nothing, not even light, can escape

  3. A region of spacetime where gravity is so strong that light can escape but nothing else can

  4. A region of spacetime where gravity is so weak that light can escape but nothing else can
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape.

Multiple choice

What is the Chandrasekhar limit?

  1. The maximum mass a white dwarf can have before it collapses into a neutron star

  2. The maximum mass a neutron star can have before it collapses into a black hole

  3. The maximum mass a black hole can have before it evaporates

  4. The maximum mass a star can have before it explodes as a supernova
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Chandrasekhar limit is the maximum mass a white dwarf can have before it collapses under its own gravity and becomes a neutron star.