Welcome to the Pulsars MCQs with Answers. In this post, we are sharing Pulsars Multiple Choice Questions and Answers in Astronomy section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Pulsars online MCQs Test.
What is a pulsar?
a) A type of black hole
b) A rapidly rotating neutron star
c) A dying star
d) A newly formed star
How are pulsars detected?
a) By their gravitational waves
b) By their radio pulses
c) By their X-ray emissions
d) By their visible light
Who first discovered pulsars?
a) Albert Einstein
b) Jocelyn Bell Burnell and Antony Hewish
c) Edwin Hubble
d) Carl Sagan
What causes the pulsing effect of a pulsar?
a) The star’s magnetic field
b) The star’s rotation
c) The star’s temperature fluctuations
d) The star’s gravitational field
What is the typical rotation period of a pulsar?
a) 1 second
b) 1 minute
c) 1 hour
d) 1 day
What type of star remains after a supernova explosion if it is not massive enough to become a black hole?
a) White dwarf
b) Neutron star
c) Red giant
d) Brown dwarf
What feature distinguishes a millisecond pulsar from other pulsars?
a) Its magnetic field strength
b) Its rotation period
c) Its size
d) Its location in a galaxy
Which part of a pulsar’s electromagnetic spectrum is most commonly observed?
a) Infrared
b) X-ray
c) Radio
d) Visible light
What happens to a pulsar’s pulse period over time?
a) It decreases
b) It increases
c) It remains constant
d) It fluctuates randomly
What is the primary mechanism that produces the pulsar’s emitted pulses?
a) Magnetic field alignment
b) Matter accretion
c) Relativistic jets
d) Rotation and magnetic field interactions
What type of pulsar is known to have a companion star?
a) Radio pulsar
b) Millisecond pulsar
c) Binary pulsar
d) X-ray pulsar
What is the typical size of a neutron star?
a) About the size of Earth
b) About the size of a city
c) About the size of a small moon
d) About the size of the Sun
What is the primary component of a pulsar’s surface?
a) Hydrogen
b) Helium
c) Neutron matter
d) Iron
What do the pulsed signals of a pulsar often indicate about the pulsar’s rotation?
a) The rotation is perfectly uniform
b) The rotation is slowing down over time
c) The rotation is accelerating
d) The rotation is completely random
Which type of pulsar is associated with X-ray emissions?
a) Millisecond pulsar
b) Binary pulsar
c) Radio pulsar
d) Young pulsar
How is the magnetic field of a pulsar oriented relative to its rotation axis?
a) Perpendicular
b) Parallel
c) Random
d) Aligned
What phenomenon is often used to test theories of general relativity using pulsars?
a) Pulsar timing
b) Pulsar brightness variations
c) Pulsar position shifts
d) Pulsar pulse width changes
Which type of pulsar is known for its extreme rotational speed?
a) Radio pulsar
b) Young pulsar
c) Millisecond pulsar
d) Binary pulsar
What is the main reason for a pulsar’s high density?
a) The collapse of a supernova remnant
b) Accretion of surrounding matter
c) Magnetic field compression
d) Chemical reactions
Which type of pulsar is often found in close binary systems with a companion star?
a) Neutron star pulsar
b) X-ray pulsar
c) Millisecond pulsar
d) Radio pulsar
How does a pulsar’s rotation affect the timing of its pulses?
a) It makes them vary randomly
b) It makes them appear at regular intervals
c) It makes them disappear completely
d) It causes them to change wavelength
What is a “pulsar wind”?
a) A stream of particles emitted from the pulsar’s magnetic poles
b) A magnetic field generated by the pulsar
c) A gas cloud surrounding the pulsar
d) A type of stellar wind from a nearby star
Which of the following is a famous pulsar known for its regular pulses?
a) Crab Pulsar
b) Vela Pulsar
c) PSR B1919+21
d) All of the above
What does the term “pulsar timing” refer to?
a) Measuring the intervals between pulses to study pulsar properties
b) Determining the exact location of a pulsar
c) Timing the pulse of X-ray emissions
d) Measuring the brightness of a pulsar over time
What is the typical magnetic field strength of a pulsar?
a) 10^8 to 10^11 Gauss
b) 10^12 to 10^14 Gauss
c) 10^15 to 10^17 Gauss
d) 10^18 to 10^20 Gauss
Which type of pulsar is often studied to understand the structure of neutron stars?
a) Binary pulsar
b) Millisecond pulsar
c) Young pulsar
d) Radio pulsar
What type of radiation do pulsars primarily emit?
a) Gamma rays
b) Visible light
c) Radio waves
d) Ultraviolet light
What effect does the intense gravity of a pulsar have on its surrounding space?
a) It causes gravitational lensing
b) It creates a supernova remnant
c) It influences nearby star formation
d) It forms a neutron star binary
What is one of the most famous pulsars associated with a supernova remnant?
a) Crab Pulsar
b) PSR B0531+21
c) Vela Pulsar
d) PSR J0437-4715
What type of interaction often leads to the formation of a millisecond pulsar?
a) Accretion of matter from a companion star
b) Supernova explosion
c) Stellar collision
d) Black hole merger
Which phenomenon is observed when a pulsar’s emission is pulsed?
a) A lighthouse effect
b) A Doppler effect
c) A gravitational wave
d) A redshift effect
How does a pulsar’s magnetic field affect its emitted radiation?
a) It accelerates particles to high energies
b) It causes the radiation to become polarized
c) It absorbs the radiation
d) It alters the radiation’s wavelength
What type of system often results in the discovery of binary pulsars?
a) High-energy X-ray binaries
b) Low-mass star systems
c) Radio surveys of the sky
d) Optical telescopic surveys
What type of pulsar is known for emitting X-rays?
a) Radio pulsar
b) Millisecond pulsar
c) X-ray pulsar
d) Gamma-ray pulsar
What is the typical age range of a young pulsar?
a) 1 to 10 million years
b) 100 to 500 million years
c) 1 to 5 billion years
d) Over 10 billion years
Which component of a pulsar’s emission is commonly used to map its magnetosphere?
a) X-rays
b) Optical light
c) Radio waves
d) Gamma rays
What is one reason pulsars are useful in testing theories of relativity?
a) Their strong magnetic fields affect space-time
b) They orbit very close to other neutron stars
c) Their pulse periods are highly regular
d) Their size is large relative to their mass
How does the emission from a pulsar’s magnetic poles create pulses?
a) By aligning with the rotation axis
b) By generating high-frequency radiation
c) By focusing radiation into beams
d) By creating a shadow effect
Which type of pulsar is characterized by extremely rapid rotation?
a) Binary pulsar
b) Millisecond pulsar
c) Young pulsar
d) Magnetar
What is the significance of studying pulsar timing arrays?
a) To detect gravitational waves
b) To map dark matter distribution
c) To observe star formation
d) To measure cosmic microwave background fluctuations
What physical process leads to a pulsar’s extreme density?
a) Neutron degeneracy pressure
b) Gravitational collapse
c) Magnetic field compression
d) Stellar fusion
Which astronomical tool is best suited for observing pulsars?
a) Radio telescope
b) Optical telescope
c) X-ray telescope
d) Gamma-ray telescope
What type of star is a pulsar’s core primarily composed of?
a) Hydrogen
b) Helium
c) Neutron
d) Iron
What is one of the key features of pulsars that makes them useful for studying the interstellar medium?
a) Their highly regular pulse periods
b) Their variable luminosity
c) Their high temperatures
d) Their proximity to Earth
What is a “pulsar glitch”?
a) A sudden change in a pulsar’s rotation rate
b) A brief interruption in the pulsar’s emission
c) A distortion in the pulsar’s magnetic field
d) An anomaly in pulsar’s X-ray emission
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