Quiz about Round 2

Question 1

Which curves provide evidence for the existence of dark matter?

Accepted Answer

Rotation curves

Answer

Elliptical curves

Answer

Spiral curves

Answer

Gravitational curves

Question 2

What is one hypothesized particle that dark matter could be composed of?

Accepted Answer

Axions

Answer

Photons

Answer

Electrons

Answer

Protons

Question 3

Which of the following is a property of dark matter?

Accepted Answer

Does not interact with light

Answer

Emits electromagnetic radiation

Answer

Visible to telescopes

Answer

Found only in black holes

Question 4

Which term describes the bending of light by massive objects, suggesting dark matter's presence?

Accepted Answer

Lensing

Answer

Redshift

Answer

Diffraction

Answer

Refraction

Question 5

Which of these searches for signals from dark matter annihilation?

Accepted Answer

Fermi Telescope

Answer

Large Hadron Collider

Answer

LUX Experiment

Answer

Hubble Telescope

Question 6

Why is dark matter difficult to detect?

Accepted Answer

It has no electromagnetic interaction

Answer

It is far from galaxies

Answer

It is too massive to measure

Answer

It decays quickly

Question 7

How does dark matter help galaxies maintain their structure?

Accepted Answer

Provides extra gravitational pull

Answer

Absorbs electromagnetic radiation

Answer

Emits cosmic rays

Answer

Reduces gravitational effects

Question 8

The study of dark matter can help in understanding:

Accepted Answer

The fate of the universe

Answer

Planetary motion

Answer

Evolution of stars

Answer

Solar system dynamics

Question 9

Which force does dark matter influence most in galaxies?

Accepted Answer

Gravitational

Answer

Electromagnetic

Answer

Nuclear

Answer

Weak force

Question 10

What is the Schwarzschild radius?

Accepted Answer

The radius of a black hole's event horizon

Answer

The distance from a black hole where light cannot escape

Answer

) The distance from the black hole to its accretion disk

Answer

The radius of the black hole's singularity

Question 11

Which scientist first predicted the existence of black holes?

Accepted Answer

Karl Schwarzschild

Answer

Albert Einstein

Answer

Stephen Hawking

Answer

John Wheeler

Question 12

What is the event horizon of a black hole?

Accepted Answer

The boundary beyond which nothing can escape

Answer

The core of a black hole

Answer

The region where matter begins to spin rapidly

Answer

1. The outer edge of the accretion disk

Question 13

What is a singularity in the context of a black hole?

Accepted Answer

The infinitely dense core of a black hole

Answer

The point at the event horizon where gravity is strongest

Answer

The point at the event horizon where gravity is strongest

Answer

The center of the black hole's accretion disk

Question 14

What do we call the radiation that is theorized to be emitted by black holes?

Accepted Answer

Hawking radiation

Answer

Gamma radiation

Answer

X-ray radiation

Answer

Electromagnetic radiation

Question 15

In what way does a black hole affect time for an observer near its event horizon?

Accepted Answer

Time slows down

Answer

Time speeds up

Answer

Time stays constant

Answer

Time reverses

Question 16

What is the name of the boundary around a rotating black hole beyond which particles cannot remain in a stable orbit?

Accepted Answer

Ergosphere

Answer

Photon sphere

Answer

Event horizon

Answer

Accretion disk

Question 17

What is the most accurate description of a black hole's event horizon?

Accepted Answer

An invisible sphere

Answer

A solid surface

Answer

A brightly glowing edge

Answer

A large planetary body

Question 18

How is the mass of a black hole typically measured?

Accepted Answer

By its gravitational pull on nearby stars

Answer

By its brightness

Answer

By its size

Answer

By its temperature

Question 19

What is the primary method astronomers use to detect black holes?

Accepted Answer

Detecting gravitational waves

Answer

Observing visible light emitted by the black hole

Answer

Measuring radio waves from the black hole

Answer

Observing the behavior of nearby matter

Question 20

What term describes the process by which a black hole pulls in and consumes matter?

Accepted Answer

Accretion

Answer

Sublimation

Answer

Diffusion

Answer

Radiation

Question 21

Choose from below

Accepted Answer

The Lorentz factor, which accounts for time dilation

Answer

The speed of light in a vacuum

Answer

The distance travelled

Answer

The acceleration of the moving object

Question 22

What happens to the information that falls into a black hole according to the information paradox?

Accepted Answer

It is lost forever

Answer

It is destroyed

Answer

It is stored in the singularity

Answer

It remains at the event horizon

Question 23

Which type of black hole is formed by the collapse of a massive star?

Accepted Answer

Stellar black hole

Answer

Supermassive black hole

Answer

Primordial black hole

Answer

Micro black hole

Question 24

What is the effect of a black hole's gravity on light passing near it?

Accepted Answer

Light is bent

Answer

Light is absorbed

Answer

Light is amplified

Answer

Light is unaffected

Question 25

Which of these is not a type of black hole?

Accepted Answer

Quasar

Answer

Stellar

Answer

Supermassive

Answer

Intermediate

Question 26

What is the focus of direct dark matter detection experiments?

Accepted Answer

Interactions with ordinary matter

Answer

Measuring annihilation products

Answer

Studying electromagnetic waves

Answer

Observing gravitational waves

Question 27

How are supermassive black holes at the centers of galaxies detected?

Accepted Answer

By the intense light from accreting material

Answer

By their strong magnetic fields

Answer

By the size of their event horizon

Answer

By their X-ray emissions

Question 28

What is the term for the path a particle takes as it approaches a black hole but escapes its gravity?

Accepted Answer

Hyperbolic trajectory

Answer

Event horizon

Answer

Accretion disk

Answer

Photon sphere

Question 29

What happens to the light emitted from an object as it approaches the event horizon of a black hole?

Accepted Answer

It redshifts

Answer

It blueshifts

Answer

It becomes brighter

Answer

It remains unchanged

Question 30

What is the Penrose process in relation to black holes?

Accepted Answer

A process to extract energy from a rotating black hole

Answer

A method to measure a black hole's mass

Answer

The formation of a black hole's event horizon

Answer

1. The collapse of a star into a black hole

Question 31

How does the concept of frame dragging relate to black holes?

Accepted Answer

It explains the twisting of spacetime around a rotating black hole

Answer

It describes the bending of light around a black hole

Answer

It refers to the time dilation effects near a black hole

Answer

1. It denotes the increase in gravitational force near a black hole

Question 32

Which phenomenon occurs when two black holes merge?

Accepted Answer

The creation of a larger black hole

Answer

An explosion of matter

Answer

The destruction of both black holes

Answer

1. The formation of a neutron star

Question 33

What determines the Hawking radiation temperature of a black hole?

Accepted Answer

Its mass

Answer

Its charge

Answer

Its spin

Answer

Its age

Question 34

Which of the following phenomena is associated with the extreme gravitational pull of black holes?

Accepted Answer

Tidal forces

Answer

Doppler Effect

Answer

Redshift

Answer

Blue shift

Question 35

What is the significance of the Kerr metric in black hole theory?

Accepted Answer

It describes a rotating black hole

Answer

It describes a non-rotating black hole

Answer

It determines the temperature of a black hole

Answer

It measures the gravitational pull of a black hole

Question 36

What phenomenon occurs when a black hole's tidal forces stretch and compress an object?

Accepted Answer

Spaghettification

Answer

Frame dragging

Answer

Time dilation

Answer

Redshift

Question 37

Which force primarily governs the formation of black holes?

Accepted Answer

Gravitational force

Answer

Electromagnetic force

Answer

Strong nuclear force

Answer

Weak nuclear force

Question 38

What is the main implication of the information paradox in black hole physics?

Accepted Answer

Information that falls into a black hole may be lost forever

Answer

Black holes can grow infinitely large

Answer

) Black holes can emit gravitational waves

Answer

Black holes can merge to form larger black holes

Question 39

What is the ergosphere of a rotating black hole?

Accepted Answer

The region outside the event horizon where objects cannot remain in place

Answer

The singularity at the center of the black hole

Answer

The outer edge of the accretion disk

Answer

1. The boundary within which light cannot escape

Question 40

Which mathematical tool is often used to describe the geometry of spacetime around black holes?

Accepted Answer

Differential geometry

Answer

Euclidean geometry

Answer

Linear algebra

Answer

Matrix Theory

Question 41

What is a ring singularity, and in which type of black hole is it found?

Accepted Answer

A ring-shaped singularity found in rotating black holes

Answer

A point-like singularity found in non-rotating black holes

Answer

A linear singularity found in binary black holes

Answer

1. A spherical singularity found in supermassive black holes

Question 42

How is the event horizon area of a black hole related to its entropy?

Accepted Answer

) The event horizon area is proportional to the black hole's entropy

Answer

The event horizon area is inversely proportional to the black hole's entropy

Answer

The event horizon area is unrelated to the black hole's entropy

Answer

The event horizon area is equal to the black hole's entropy

Question 43

Which term describes the hypothetical tunnels connecting two different points in spacetime, sometimes associated with black holes?

Accepted Answer

Wormholes

Answer

Time loops

Answer

Cosmic strings

Answer

Gravitational bridges

Question 44

How does Hawking radiation theoretically affect the mass of a black hole over time?

Accepted Answer

It causes the black hole to lose mass

Answer

It increases the black hole's mass

Answer

It has no effect on the black hole's mass

Answer

It stabilizes the black hole's mass

Question 45

Which of the following statements correctly describes time dilation?

Accepted Answer

Time passes slower for a moving observer relative to a stationary one

Answer

time passes faster for a moving observer relative to a stationary one.

Answer

Time is independent of an object's speed.

Answer

Time dilation only occurs in strong gravitational fields.

Question 46

In special relativity, what happens to time for an observer moving at close to the speed of light relative to a stationary observer?

Accepted Answer

Time passes slower for the moving observer.

Answer

Time passes at the same rate for both observers.

Answer

Time passes faster for the moving observer.

Answer

Time stops completely for the moving observer.

Question 47

What does gravitational time dilation predict about time near a massive object like a planet or black hole?

Accepted Answer

Time passes slower the closer you are to the massive object.

Answer

Time passes faster the closer you are to the massive object.

Answer

Time does not change based on gravity.

Answer

Time stops completely at the surface of a massive object.

Question 48

What was the result of the Hafele-Keating experiment (1971)?

Accepted Answer

Clocks on planes ran slower compared to those on Earth due to both velocity and gravity.

Answer

Clocks on planes experienced no difference compared to clocks on Earth.

Answer

Clocks on planes ran faster compared to those on Earth.

Answer

Clocks on planes showed no correlation with the time on Earth.

Question 49

Which of the following technologies must account for time dilation to function accurately?

Accepted Answer

GPS satellites

Answer

Telephones

Answer

Microwaves

Answer

Household clocks

Question 50

What is the no-hair theorem in black hole physics?

Accepted Answer

Black holes are characterized only by mass, charge, and angular momentum

Answer

Black holes cannot lose mass

Answer

Black holes do not emit any radiation

Answer

Black holes have no magnetic fields

Question 51

In the twin paradox, the twin who travels at near-light speed will:

Accepted Answer

Age slower than the twin who stays on Earth.

Answer

Age faster than the twin who stays on Earth.

Answer

Have the same age as the twin who stays on Earth.

Answer

Be unaffected by time dilation.

Question 52

Which equation is used to calculate time dilation due to relative motion in special relativity?

Accepted Answer

Question 53

What happens to time as an object approaches the event horizon of a black hole?

Accepted Answer

Time appears to freeze from the perspective of an external observer

Answer

Time speeds up.

Answer

Time stops completely for the object

Answer

Time passes faster the closer the object gets to the event horizon

Question 54

According to special relativity, which of the following will cause the greatest time dilation effect?

Accepted Answer

A spaceship travelling at 90% the speed of light.

Answer

A car moving at 50 km/h.

Answer

A jet flying at 1,000 km/h

Answer

A satellite in orbit around Earth.

Question 55

Approaching the event horizon of a black hole, what would you see looking back?

Accepted Answer

Rest of the universe speed up drastically.

Answer

Rest of the universe get drastically slower.

Answer

Time seems to pass normally for others.

Answer

<ol><li>Nothing</li></ol>

Question 56

Why do GPS satellites need to account for time dilation effects?

Accepted Answer

Both special and general relativistic time dilation effects occur.

Answer

They are in motion relative to Earth, experiencing special relativity time dilation.

Answer

They are farther from Earth's gravitational field, experiencing weaker gravity, leading to general relativity time dilation

Answer

Time dilation does not affect GPS satellites.

Question 57

Which of the following is true according to the theory of special relativity?

Accepted Answer

Events that are simultaneous in one reference frame may not be simultaneous in another moving reference frame.

Answer

Events that are simultaneous in one reference frame are also simultaneous in another.

Answer

Time is independent of the observer's motion.

Answer

Time dilation does not affect simultaneity.

Question 58

Which of the following objects experiences the least gravitational time dilation effect?

Accepted Answer

An astronaut in orbit around the Moon.

Answer

A person standing on Earth.

Answer

A satellite orbiting Earth at 500 km altitude.

Answer

A spaceship near a supermassive black hole.

Question 59

In the twin paradox, why does the twin who travels at a high speed age slower than the one who stays on Earth?

Accepted Answer

The travelling twin experiences time dilation due to high velocity.

Answer

The travelling twin experiences more gravity.

Answer

The travelling twin accelerates to high speed, which causes time dilation.

Answer

The travelling twin is exposed to more radiation.

Question 60

Which of the following would you expect to experience the least time dilation effect in everyday life?

Accepted Answer

A person sitting in a parked car.

Answer

A person flying in a commercial airoplane.

Answer

A person in low orbit around the Earth.

Answer

A person moving at 99% the speed of light.

Question 61

What does length contraction in special relativity refer to?

Accepted Answer

Moving objects appear shorter along the direction of motion

Answer

Objects appear longer in motion

Answer

Moving objects appear shorter in all directions

Answer

Moving objects expand in the direction of motion

Question 62

The second postulate of special relativity states that the __________ is constant for all observers, regardless of their motion relative to the source.

Accepted Answer

Speed of light

Answer

Gravitational force

Answer

Passage of time

Answer

Mass of objects

Question 63

If a spaceship travels at near-light speed, how would communication with Earth appear to work from the spaceship's perspective?

Accepted Answer

Signals from Earth would appear to be delayed.

Answer

Signals from Earth would be received more quickly

Answer

No signals would be received.

Answer

Signals from Earth would be received instantaneously.

Question 64

Who proposed the theories of special and general relativity, which form the basis for understanding time dilation?

Accepted Answer

Albert Einstein

Answer

Isaac Newton

Answer

Galileo Galilei

Answer

Nikola Tesla

Round 2

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