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Quasars MCQs with Answers
What are quasars primarily composed of?
A) Hydrogen
B) Helium
C) Carbon
D) Plasma
Quasars emit radiation across which part of the electromagnetic spectrum?
A) Radio waves
B) Infrared
C) X-rays
D) All of the above
What is the primary characteristic of quasars?
A) Rapid rotation
B) Supermassive black holes
C) High surface temperature
D) Solar flares
Which term describes the apparent brightness of a quasar?
A) Absolute magnitude
B) Luminosity
C) Apparent magnitude
D) Flux
Quasars are often found at the centers of:
A) Spiral galaxies
B) Elliptical galaxies
C) Irregular galaxies
D) Dwarf galaxies
What is the approximate size of a typical quasar?
A) Few kilometers
B) Few million kilometers
C) Few light-years
D) Few million light-years
Which process powers the luminosity of quasars?
A) Nuclear fusion
B) Gravitational collapse
C) Accretion of matter onto supermassive black holes
D) Stellar evolution
What is the spectral feature that indicates the presence of a quasar?
A) Lyman series
B) Balmer series
C) Paschen series
D) Brackett series
Quasars were first identified as unusual objects with high:
A) Luminosity
B) Temperature
C) Redshift
D) Mass
What is the dominant color of light emitted by quasars?
A) Red
B) Blue
C) Green
D) Yellow
Quasars are believed to have been more common in the:
A) Early universe
B) Middle ages
C) Recent past
D) Future
The enormous energy output of quasars is attributed to:
A) Nuclear fusion
B) Gravitational potential energy
C) Electromagnetic radiation
D) Hawking radiation
What is the phenomenon that causes quasars to appear extremely bright?
A) Gravitational lensing
B) Time dilation
C) Relativistic beaming
D) Superluminal motion
Quasars were first discovered in the early:
A) 1950s
B) 1960s
C) 1970s
D) 1980s
What is the process by which quasars emit powerful jets of radiation?
A) Gravitational collapse
B) Accretion disk formation
C) Black hole evaporation
D) Relativistic jets
Quasars are among the most distant objects observed in the universe due to their:
A) Large size
B) High luminosity
C) Low redshift
D) Lack of proper motion
The energy source of quasars was finally identified as:
A) Supernovae
B) Accretion disks around supermassive black holes
C) Pulsars
D) White dwarfs
Which emission line is commonly observed in the spectra of quasars?
A) H-alpha
B) H-beta
C) Lyman-alpha
D) Paschen-alpha
Quasars are believed to play a crucial role in the process of:
A) Stellar formation
B) Galaxy formation and evolution
C) Planetary formation
D) Dark matter distribution
The term “quasar” is derived from:
A) Quasi-stellar radio source
B) Quasar-star hybrid
C) Quasi-stellar astronomical object
D) Quantum star
Quasars were initially mistaken for:
A) Supernovae
B) Planets
C) Stars
D) Comets
The intense gravity of quasars can bend light, a phenomenon known as:
A) Gravitational collapse
B) Gravitational redshift
C) Gravitational lensing
D) Gravitational wave emission
What type of radiation is emitted from the accretion disk surrounding a supermassive black hole in a quasar?
A) Gamma rays
B) X-rays
C) Ultraviolet
D) Infrared
Quasars are known to exhibit what property, making them appear brighter from certain angles?
A) Gravitational lensing
B) Superluminal motion
C) Relativistic beaming
D) Doppler effect
What is the estimated mass of supermassive black holes found in quasars?
A) Thousands of solar masses
B) Millions to billions of solar masses
C) Trillions of solar masses
D) Hundreds of billions of solar masses
Quasars are thought to be powered by:
A) Nuclear fusion
B) Electromagnetic fields
C) Gravitational collapse
D) Accretion disks
Quasars were first identified as point-like sources of:
A) Radio waves
B) X-rays
C) Infrared radiation
D) Visible light
What type of galaxies are quasars often found in?
A) Spiral galaxies
B) Elliptical galaxies
C) Irregular galaxies
D) Dwarf galaxies
Quasars are powered by the release of gravitational energy from:
A) Neutron stars
B) Black holes
C) Red giants
D) White dwarfs
What is the primary source of the enormous energy output of quasars?
A) Nuclear fusion reactions
B) Stellar collisions
C) Gravitational potential energy
D) Solar flares
Quasars can emit more energy than:
A) A galaxy
B) A star
C) A supernova
D) All of the above
The discovery of quasars helped establish the link between:
A) Stellar evolution and galactic formation
B) Galaxy clusters and dark matter
C) Black holes and active galactic nuclei
D) Supernovae and planetary nebulae
Quasars are believed to be one of the most luminous objects in the:
A) Milky Way galaxy
B) Universe
C) Local Group of galaxies
D) Solar System
What is the primary mechanism by which quasars emit radiation?
A) Nuclear fusion
B) Gravitational collapse
C) Accretion of matter onto supermassive black holes
D) Stellar fusion
Quasars can emit jets of particles traveling at velocities close to the speed of:
A) Sound
B) Light
C) Gravity
D) Wind
What is the redshift of most distant known quasars?
A) 0.1
B) 1.0
C) 2.0
D) 3.0
Quasars were initially detected as radio sources with no known:
A) Visible counterparts
B) X-ray counterparts
C) Infrared counterparts
D) Ultraviolet counterparts
What is the primary factor determining the variability of quasars?
A) Rotation
B) Accretion disk structure
C) Black hole mass
D) Brightness
The energy emitted by a quasar is primarily generated by:
A) Nuclear fusion
B) Frictional heating
C) Gravitational compression
D) Magnetic fields
The study of quasars has provided insights into the early history of the:
A) Universe
B) Solar System
C) Milky Way
D) Galaxy
Quasars can be observed at large cosmological distances due to their:
A) High luminosity
B) Low mass
C) Low luminosity
D) Proximity to Earth
The energy released by a quasar is generated by the process of:
A) Fusion
B) Fission
C) Accretion
D) Diffusion
Quasars were initially discovered through observations in which part of the electromagnetic spectrum?
A) Infrared
B) Radio
C) Visible
D) X-ray
Quasars emit large amounts of energy over a wide range of wavelengths, making them:
A) Point sources
B) Broadband sources
C) Point-like sources
D) Single-wavelength sources
What feature distinguishes quasars from normal galaxies?
A) Presence of a supermassive black hole
B) Lack of stars
C) Lack of interstellar gas
D) Presence of dark matter
Quasars are known to exhibit strong:
A) Magnetic fields
B) Stellar winds
C) Supernovae
D) Cosmic rays
Quasars exhibit strong redshifts due to:
A) Doppler effect
B) Gravitational lensing
C) Time dilation
D) Gravitational redshift
The radiation emitted by quasars is believed to originate from the:
A) Event horizon
B) Accretion disk
C) Photosphere
D) Corona
The intense radiation emitted by quasars can ionize:
A) Interstellar gas
B) Dark matter
C) Stellar winds
D) Planetary atmospheres
Quasars are believed to have been much more common in the:
A) Recent universe
B) Early universe
C) Middle ages
D) Modern era
