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Pulsars MCQs with Answers

Pulsars MCQs

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

Answer
b) A rapidly rotating neutron 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

Answer
b) By their radio pulses

Who first discovered pulsars?
a) Albert Einstein
b) Jocelyn Bell Burnell and Antony Hewish
c) Edwin Hubble
d) Carl Sagan

Answer
b) Jocelyn Bell Burnell and Antony Hewish

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

Answer
b) The star’s rotation

What is the typical rotation period of a pulsar?
a) 1 second
b) 1 minute
c) 1 hour
d) 1 day

Answer
a) 1 second

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

Answer
b) Neutron star

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

Answer
b) Its rotation period

Which part of a pulsar’s electromagnetic spectrum is most commonly observed?
a) Infrared
b) X-ray
c) Radio
d) Visible light

Answer
c) Radio

What happens to a pulsar’s pulse period over time?
a) It decreases
b) It increases
c) It remains constant
d) It fluctuates randomly

Answer
b) It increases

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

Answer
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

Answer
c) Binary 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

Answer
a) About the size of Earth

What is the primary component of a pulsar’s surface?
a) Hydrogen
b) Helium
c) Neutron matter
d) Iron

Answer
c) Neutron matter

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

Answer
b) The rotation is slowing down over time

Which type of pulsar is associated with X-ray emissions?
a) Millisecond pulsar
b) Binary pulsar
c) Radio pulsar
d) Young pulsar

Answer
b) Binary pulsar

How is the magnetic field of a pulsar oriented relative to its rotation axis?
a) Perpendicular
b) Parallel
c) Random
d) Aligned

Answer
a) Perpendicular

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

Answer
a) Pulsar timing

Which type of pulsar is known for its extreme rotational speed?
a) Radio pulsar
b) Young pulsar
c) Millisecond pulsar
d) Binary pulsar

Answer
c) Millisecond 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

Answer
a) The collapse of a supernova remnant

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

Answer
c) Millisecond 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

Answer
b) It makes them appear at regular intervals

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

Answer
a) A stream of particles emitted from the pulsar’s magnetic poles

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

Answer
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

Answer
a) Measuring the intervals between pulses to study pulsar properties

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

Answer
b) 10^12 to 10^14 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

Answer
c) Young pulsar

What type of radiation do pulsars primarily emit?
a) Gamma rays
b) Visible light
c) Radio waves
d) Ultraviolet light

Answer
c) Radio waves

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

Answer
a) It causes gravitational lensing

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

Answer
a) Crab Pulsar

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

Answer
a) Accretion of matter from a companion star

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

Answer
a) A lighthouse 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

Answer
b) It causes the radiation to become polarized

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

Answer
c) Radio surveys of the sky

What type of pulsar is known for emitting X-rays?
a) Radio pulsar
b) Millisecond pulsar
c) X-ray pulsar
d) Gamma-ray pulsar

Answer
c) X-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

Answer
a) 1 to 10 million 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

Answer
c) Radio waves

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

Answer
c) Their pulse periods are highly regular

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

Answer
c) By focusing radiation into beams

Which type of pulsar is characterized by extremely rapid rotation?
a) Binary pulsar
b) Millisecond pulsar
c) Young pulsar
d) Magnetar

Answer
b) Millisecond pulsar

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

Answer
a) To detect gravitational waves

What physical process leads to a pulsar’s extreme density?
a) Neutron degeneracy pressure
b) Gravitational collapse
c) Magnetic field compression
d) Stellar fusion

Answer
b) Gravitational collapse

Which astronomical tool is best suited for observing pulsars?
a) Radio telescope
b) Optical telescope
c) X-ray telescope
d) Gamma-ray telescope

Answer
a) Radio telescope

What type of star is a pulsar’s core primarily composed of?
a) Hydrogen
b) Helium
c) Neutron
d) Iron

Answer
c) Neutron

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

Answer
a) Their highly regular pulse periods

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

Answer
a) A sudden change in a pulsar’s rotation rate

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