Welcome to the Quasars MCQs with Answers. In this post, we are sharing Quasars Multiple Choice Questions and Answers in Astronomy section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Quasars online MCQs Test.
What is a quasar?
a) A type of star
b) A type of galaxy
c) A supermassive black hole at the center of a galaxy
d) A nebula
How are quasars typically observed?
a) In the infrared spectrum
b) In the ultraviolet spectrum
c) In the radio spectrum
d) In the X-ray spectrum
What is the primary energy source for a quasar?
a) Fusion of hydrogen
b) Accretion of matter onto a supermassive black hole
c) Chemical reactions in the galaxy
d) Stellar collisions
Which characteristic is commonly associated with quasars?
a) High luminosity
b) Low redshift
c) Absence of emission lines
d) Low variability
What is the approximate distance of the most distant quasars known?
a) 1 billion light-years
b) 2 billion light-years
c) 10 billion light-years
d) 13 billion light-years
What was the initial term used to describe quasars when they were first discovered?
a) Radio stars
b) Stellar radio sources
c) Cosmic explosions
d) Galactic nuclei
Which of the following best describes the size of a quasar’s emitting region?
a) Comparable to the size of the Solar System
b) Comparable to the size of the Milky Way Galaxy
c) Comparable to the size of a large star
d) Comparable to the size of a galaxy
What type of galaxy is often associated with the presence of a quasar?
a) Elliptical Galaxy
b) Irregular Galaxy
c) Spiral Galaxy
d) Lenticular Galaxy
What type of radiation is most intense in a quasar?
a) Gamma-ray
b) Radio waves
c) Visible light
d) X-rays
Which astronomer is credited with the discovery of quasars?
a) Edwin Hubble
b) Fritz Zwicky
c) Maarten Schmidt
d) Carl Sagan
What phenomenon causes the observed redshift in quasars?
a) Doppler effect
b) Gravitational lensing
c) Cosmic expansion
d) Stellar motion
What is a key feature used to identify a quasar in optical observations?
a) A very small angular size
b) A very bright and steady point source
c) A highly variable brightness
d) A specific emission line pattern
Which type of quasar is characterized by strong emission lines in its spectrum?
a) Radio-quiet Quasars
b) Radio-loud Quasars
c) Narrow-line Seyfert 1 Quasars
d) Broad-line Seyfert 1 Quasars
What is the typical luminosity range for quasars?
a) 10^10 to 10^12 solar luminosities
b) 10^7 to 10^9 solar luminosities
c) 10^13 to 10^15 solar luminosities
d) 10^5 to 10^7 solar luminosities
Which of the following objects is a quasar?
a) 3C 273
b) Messier 87
c) Andromeda Galaxy
d) Cygnus X-1
How do quasars typically vary in brightness?
a) Rapidly and significantly
b) Slowly and consistently
c) Not at all
d) Only during specific seasons
What is one reason quasars are important for cosmology?
a) They help measure the expansion rate of the Universe
b) They indicate the presence of dark matter
c) They are used to study stellar evolution
d) They provide clues about planetary formation
Which element is typically found in high abundance in the spectra of quasars?
a) Hydrogen
b) Helium
c) Carbon
d) Iron
What is the typical redshift range for quasars?
a) 0.1 to 0.5
b) 1.0 to 2.0
c) 3.0 to 5.0
d) 6.0 to 8.0
Which of the following best describes the variability of quasars over time?
a) Stable and constant
b) Highly variable with periods of rapid change
c) Seasonal fluctuations
d) Long-term gradual changes
What do we call the jets of high-energy particles emitted by some quasars?
a) Plasma Streams
b) Relativistic Jets
c) Gamma-ray Bursts
d) Neutron Streams
Which of the following best describes a radio-loud quasar?
a) A quasar with strong radio emissions
b) A quasar with weak or no radio emissions
c) A quasar emitting primarily in X-rays
d) A quasar with high optical brightness
What is one reason quasars are difficult to study?
a) They are too dim to observe directly
b) Their extreme distance makes observations challenging
c) They do not emit detectable radiation
d) They are often obscured by nearby galaxies
How does the luminosity of a quasar compare to that of an entire galaxy?
a) Less than an entire galaxy
b) Approximately the same as an entire galaxy
c) Greater than an entire galaxy
d) Not comparable
What discovery led to the identification of quasars as distant active galactic nuclei?
a) Their optical spectra
b) Their radio emission characteristics
c) Their X-ray emissions
d) Their infrared signatures
Which galaxy type is most commonly associated with the presence of quasars?
a) Elliptical Galaxies
b) Spiral Galaxies
c) Irregular Galaxies
d) Lenticular Galaxies
What do the broad emission lines in a quasar spectrum indicate?
a) High velocity of gas in the accretion disk
b) Low temperature of the emitting region
c) Absence of surrounding matter
d) Stability of the quasar
Which physical process is primarily responsible for the high-energy emissions of quasars?
a) Nuclear fusion
b) Gravitational potential energy release
c) Chemical reactions
d) Stellar wind interactions
What type of black hole is typically found at the center of a quasar?
a) Stellar-mass Black Hole
b) Intermediate-mass Black Hole
c) Supermassive Black Hole
d) Primordial Black Hole
What characteristic helps distinguish quasars from other active galactic nuclei (AGN)?
a) Their higher luminosity
b) Their lower redshift
c) Their smaller size
d) Their absence of emission lines
How do astronomers measure the distance of quasars from Earth?
a) By observing their redshift
b) By measuring their luminosity
c) By studying their optical spectra
d) By analyzing their radio emissions
What is the primary component of the accretion disk surrounding a quasar’s black hole?
a) Gas and dust
b) Dark matter
c) Stars
d) Neutron matter
Which term refers to a quasar’s rapid change in brightness?
a) Variability
b) Stability
c) Flux
d) Luminosity
What does the term “blazar” refer to?
a) A type of quasar with highly variable emission
b) A type of supernova
c) A type of radio galaxy
d) A type of pulsar
What is one key observational feature of quasars in the radio spectrum?
a) High flux density
b) Absence of emission lines
c) Low variability
d) Low luminosity
Which type of emission lines are broad in quasars?
a) Forbidden lines
b) Narrow lines
c) Broad lines
d) Absorption lines
What is one reason for the variability in a quasar’s light output?
a) Changes in the accretion rate of matter
b) Changes in the surrounding dark matter
c) Variations in the cosmic microwave background
d) Variations in the Earth’s atmosphere
Which type of galaxy often hosts a quasar?
a) A young galaxy
b) A mature galaxy
c) A galaxy with active star formation
d) A galaxy with a dormant nucleus
What is one major challenge in studying quasars?
a) Their rapid variability
b) Their low luminosity
c) Their proximity
d) Their stable brightness
What is the impact of a quasar’s jets on its host galaxy?
a) They can induce star formation
b) They can inhibit star formation
c) They have no impact
d) They can lead to galaxy mergers
Which wavelength range is used to study the relativistic jets of quasars?
a) Gamma-ray
b) Radio
c) Visible
d) Infrared
Which of the following is an example of a famous quasar?
a) 3C 273
b) Messier 87
c) Andromeda
d) Cygnus X-1
What effect does the extreme gravitational field of a quasar have on its surrounding environment?
a) It accelerates particles to near-light speeds
b) It slows down all surrounding matter
c) It causes matter to evaporate
d) It induces stellar collisions
Which observational tool is essential for studying the high-energy emissions of quasars?
a) Optical telescopes
b) Radio telescopes
c) X-ray telescopes
d) Infrared telescopes
What can studying quasars tell us about the early Universe?
a) The formation of galaxies and supermassive black holes
b) The composition of the cosmic microwave background
c) The age of distant stars
d) The presence of dark energy
Which characteristic of quasars helps astronomers estimate their mass?
a) The width of their emission lines
b) Their color
c) Their distance from Earth
d) Their radio emission strength
What phenomenon often accompanies quasar activity?
a) Supernovae
b) Gamma-ray bursts
c) High-energy particle jets
d) Stellar formation
What is a primary reason for the discovery of quasars in the early 1960s?
a) Unusual radio sources
b) Stellar parallax measurements
c) Galactic motion studies
d) Stellar brightness fluctuations
What type of galaxy is most likely to host a quasar at its center?
a) A young, actively forming galaxy
b) An elliptical galaxy with a large central bulge
c) A spiral galaxy with a high star density
d) A galaxy undergoing active mergers
What is the primary reason for the intense luminosity of quasars?
a) High rates of nuclear fusion
b) Gravitational energy from matter falling into the black hole
c) Chemical reactions in the accretion disk
d) Stellar collisions in the surrounding galaxy
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