Physics · General Awareness

Astrophysics and Cosmology

1,697 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 general knowledge science & technology

A black hole is an invisible, highly dense celestial body with gravity strong enough to keep light from escaping. It is called a black hole because

  1. black holes were named after their discoverer, Richard Black.

  2. it is a big, dark hole in space.

  3. it only attracts black objects.

  4. it always appears dark, since no light can leave it.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A black hole appears dark because its gravitational field is so intense that nothing, including light, can escape from within the event horizon. Since no light can leave the region, it cannot be observed directly - we only detect it through its effects on nearby matter and radiation. Option A is false (black holes are not named after a person), option B is metaphorically incorrect (it's not literally a hole), and option C is nonsensical (black holes attract all matter regardless of color).

Multiple choice general knowledge science & technology

When are the black holes expected to form ?

  1. SuperNova

  2. Death of a Planet

  3. Both A & B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Black holes form when massive stars undergo gravitational collapse, typically triggered by supernova explosions. During a supernova, the core of a massive star collapses inward under its own gravity, forming a region of spacetime with gravity so strong that nothing can escape. Option A correctly identifies supernovae as the primary formation mechanism.

Multiple choice general knowledge science & technology

What are the tunnels that allow rapid travel through Space and Time ?

  1. Black Hole

  2. Time Hole

  3. Big Bang

  4. Wormhole
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A wormhole is a hypothetical tunnel connecting two points in spacetime, theoretically allowing rapid travel between them. Black holes are regions of extreme gravity where nothing escapes, not tunnels. Time holes and Big Bang are not valid tunnel concepts - Big Bang was the universe's expansion event.

Multiple choice general knowledge science & technology

The known closest black hole to Earth is

  1. Cygnus Y-1

  2. Cygnus X-1

  3. Cygnus Y-2

  4. Cygnus X-2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cygnus X-1, located about 6,070 light-years away in the constellation Cygnus, is one of the first and most famous confirmed black holes. It was discovered in 1964 and was the first strong candidate for a black hole. The other options (Cygnus Y-1, Y-2, X-2) are not recognized astronomical objects.

Multiple choice general knowledge science & technology

How far is the nearest black hole?

  1. 1600 Light years from Earth

  2. 1500 Light Years from Earth

  3. 1700 Light Years from Earth

  4. 1400 Light years from Earth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nearest known black hole to Earth is Gaia BH1, located approximately 1,600 light-years away. This was discovered in 2022, making it the closest confirmed black hole to our solar system.

Multiple choice

Directions: Arrange the sentences A, B, C and D to form a logical sequence between sentences 1 and 6.

  1. According to Einstein, gravitation is an inherent property of space-time. A. Now the path of a ray of light must be just as obedient to the laws of geometry as is any other path. B. The planets, for instance, move in the way they do because they are pursuing the easiest path through the space-time continuum that surrounds them. C. Accordingly a ray of light passing through what we call a gravitational field must follow the path appropriate to that field. D. It is not that they are acted on by a force; the path they follow is the natural 'straight line' path in a region governed by that particular kind of non-Euclidean geometry.
  2. This means, in practice, that a ray of light from a distant star, passing near the sun will be deflected, and the star will appear displaced in the sky.

  1. CABD

  2. BDAC

  3. ACDB

  4. CDBA
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sequence BDAC logically develops Einstein's concept: B explains that planets follow natural paths in space-time, D clarifies these are not forced but geometric 'straight lines' in non-Euclidean space, A applies this same principle to light rays, and C concludes that light must therefore bend in gravitational fields. This progression from planetary motion to the behavior of light directly supports the final sentence (6) about star displacement, creating a coherent explanation of gravitational lensing.

Multiple choice

Directions: Fill in the blanks.

One of the many ________ ______ proved to be near a black hole.

  1. galaxies, was

  2. galaxey, were

  3. galaxies, were

  4. galaxy, was
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In 'one of the [plural noun]' constructions, the subject is 'one,' which is singular. The verb must agree with 'one,' not with the plural noun. Therefore, 'One of the many galaxies was proved' is correct with the singular verb 'was.' The relative clause 'that proved to be near a black hole' describes which galaxy.

Multiple choice

Black holes grow in size by

Directions: Read the following passage and answer the question that follows.

When a star burns through the last of its fuel, it may find itself collapsing. For smaller stars, up to about three times Sun’s mass, the new core will be a neutron star or a white dwarf. But, when a larger star collapses, it continues to fall in on itself to create a stellar black hole.
Black holes formed by the collapse of individual stars are (relatively) small, but incredibly dense. Such an object packs three times or more than the mass of the sun into a city- size range. This leads to a crazy amount of gravitational force, pulling on objects around it. Black holes consume the dust and gas from the galaxy around them, growing in size.
The Milky Way is said to contain a few hundred million stellar black holes.

  1. star burning out

  2. collapsing star

  3. gravitational force pulling the objects around it

  4. collapse of individual stars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Options (1), (2) and (4) are the causes of creation of a black hole, whereas option (3) expresses the reason for their growing in size. Thus, it is the correct answer.

Multiple choice

Black Hole is

  1. That portion of a planet which does not receive sunlight

  2. An object in space whose gravity is so great that nothing can escape from it

  3. An asteroid which is completely opaque & does not let any light pass through it

  4. The portion of the earth from where full solar eclipse is observed
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A Black Hole is a region in space where gravity is so extremely strong that nothing, not even light, can escape from it once past the event horizon. This occurs when a massive star collapses to an extremely dense point called a singularity. The other options describe different astronomical phenomena.

Multiple choice

Which of the following fields is B.S.Chandrasekhar related to?

  1. Astronomy

  2. Elementary particles

  3. Theory of black holes

  4. Theory of numbers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

B.S. Chandrasekhar's full name was Subrahmanyan Chandrasekhar, and he was a theoretical physicist renowned for his work on the theory of black holes and stellar evolution. He won the Nobel Prize in Physics in 1983 for his theoretical studies of the physical processes of importance to the structure and evolution of stars.

Multiple choice

Directions: Three sentences are given below and you have to identify which sentence is a fact and which is an opinion.

I When a black hole and a star are close, high-energy light is produced. II Scientists think that the smallest black hole is as small as just one atom. III The black hole in the center of our galaxy has a mass more than 1 million Suns together.

  1. I - opinion; II - opinion; III - fact

  2. I - opinion; II - fact; III - fact

  3. I - fact; II - fact; III - opinion

  4. I - fact; II - opinion; III - fact

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A fact is a statement that is true and can be proven. A fact is true and correct no matter what. An opinion, however, is a statement that holds an element of belief; it tells how someone feels. An opinion is not always true and cannot be proven. Statement I and III are facts that can be proven whereas in statement II word ‘think’ suggests that it is an opinion.