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Quasars MCQs with Answers

Quasars MCQs

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

Answer
c) A supermassive black hole at the center of a galaxy

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

Answer
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

Answer
b) Accretion of matter onto a supermassive black hole

Which characteristic is commonly associated with quasars?
a) High luminosity
b) Low redshift
c) Absence of emission lines
d) Low variability

Answer
a) High luminosity

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

Answer
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

Answer
b) Stellar radio sources

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

Answer
a) Comparable to the size of the Solar System

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

Answer
a) Elliptical Galaxy

What type of radiation is most intense in a quasar?
a) Gamma-ray
b) Radio waves
c) Visible light
d) X-rays

Answer
d) X-rays

Which astronomer is credited with the discovery of quasars?
a) Edwin Hubble
b) Fritz Zwicky
c) Maarten Schmidt
d) Carl Sagan

Answer
c) Maarten Schmidt

What phenomenon causes the observed redshift in quasars?
a) Doppler effect
b) Gravitational lensing
c) Cosmic expansion
d) Stellar motion

Answer
c) Cosmic expansion

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

Answer
c) A highly variable brightness

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

Answer
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

Answer
a) 10^10 to 10^12 solar luminosities

Which of the following objects is a quasar?
a) 3C 273
b) Messier 87
c) Andromeda Galaxy
d) Cygnus X-1

Answer
a) 3C 273

How do quasars typically vary in brightness?
a) Rapidly and significantly
b) Slowly and consistently
c) Not at all
d) Only during specific seasons

Answer
a) Rapidly and significantly

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

Answer
a) They help measure the expansion rate of the Universe

Which element is typically found in high abundance in the spectra of quasars?
a) Hydrogen
b) Helium
c) Carbon
d) Iron

Answer
a) Hydrogen

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

Answer
b) 1.0 to 2.0

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

Answer
b) Highly variable with periods of rapid change

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

Answer
b) Relativistic Jets

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

Answer
a) A quasar with strong radio emissions

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

Answer
b) Their extreme distance makes observations challenging

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

Answer
c) Greater than an entire galaxy

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

Answer
a) Their optical spectra

Which galaxy type is most commonly associated with the presence of quasars?
a) Elliptical Galaxies
b) Spiral Galaxies
c) Irregular Galaxies
d) Lenticular Galaxies

Answer
a) Elliptical 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

Answer
a) High velocity of gas in the accretion disk

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

Answer
b) Gravitational potential energy release

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

Answer
c) Supermassive 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

Answer
a) Their higher luminosity

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

Answer
a) By observing their redshift

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

Answer
a) Gas and dust

Which term refers to a quasar’s rapid change in brightness?
a) Variability
b) Stability
c) Flux
d) Luminosity

Answer
a) Variability

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

Answer
a) A type of quasar with highly variable emission

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

Answer
a) High flux density

Which type of emission lines are broad in quasars?
a) Forbidden lines
b) Narrow lines
c) Broad lines
d) Absorption lines

Answer
c) Broad 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

Answer
a) Changes in the accretion rate of matter

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

Answer
b) A mature galaxy

What is one major challenge in studying quasars?
a) Their rapid variability
b) Their low luminosity
c) Their proximity
d) Their stable brightness

Answer
a) Their rapid variability

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

Answer
b) They can inhibit star formation

Which wavelength range is used to study the relativistic jets of quasars?
a) Gamma-ray
b) Radio
c) Visible
d) Infrared

Answer
b) Radio

Which of the following is an example of a famous quasar?
a) 3C 273
b) Messier 87
c) Andromeda
d) Cygnus X-1

Answer
a) 3C 273

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

Answer
a) It accelerates particles to near-light speeds

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

Answer
c) X-ray 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

Answer
a) The formation of galaxies and supermassive black holes

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

Answer
a) The width of their emission lines

What phenomenon often accompanies quasar activity?
a) Supernovae
b) Gamma-ray bursts
c) High-energy particle jets
d) Stellar formation

Answer
c) High-energy particle jets

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

Answer
a) Unusual radio sources

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

Answer
b) An elliptical galaxy with a large central bulge

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

Answer
b) Gravitational energy from matter falling into the black hole

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