Welcome to the Hubble’s Law MCQs with Answers. In this post, we are sharing Hubble’s Law Multiple Choice Questions and Answers in Astronomy section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Hubble’s Law online MCQs Test.
What does Hubble’s Law describe?
a) The rotation of galaxies
b) The expansion of the universe
c) The formation of stars
d) The motion of planets
Hubble’s Law states that the speed at which a galaxy moves away is proportional to its:
a) Mass
b) Distance from Earth
c) Size
d) Brightness
What is the unit for Hubble’s constant (H₀)?
a) Kilometers per second
b) Kilometers per second per megaparsec
c) Light-years per second
d) Parsecs per second
The relationship described by Hubble’s Law suggests that the universe is:
a) Contracting
b) Expanding
c) Static
d) Rotating
Which observation led to the formulation of Hubble’s Law?
a) The cosmic microwave background
b) Redshift in distant galaxies
c) The movement of stars
d) The formation of black holes
What does the slope of the line in a Hubble’s Law graph represent?
a) The speed of light
b) Hubble’s constant (H₀)
c) The mass of the universe
d) The gravitational pull of galaxies
If a galaxy is twice as far from Earth as another galaxy, according to Hubble’s Law, how will their recession velocities compare?
a) The farther galaxy will move twice as fast
b) The closer galaxy will move faster
c) Both will move at the same speed
d) The farther galaxy will move half as fast
Hubble’s Law provides evidence for which cosmological model?
a) The Steady State Theory
b) The Big Bang Theory
c) The Oscillating Universe Theory
d) The Multiverse Theory
What is the approximate value of Hubble’s constant (H₀) as determined by recent measurements?
a) 50 km/s/Mpc
b) 70 km/s/Mpc
c) 90 km/s/Mpc
d) 100 km/s/Mpc
What happens to the value of Hubble’s constant as the universe expands?
a) It remains constant
b) It decreases over time
c) It increases over time
d) It fluctuates randomly
Which galaxy’s recession speed can be calculated using Hubble’s Law?
a) The Andromeda Galaxy
b) The Milky Way Galaxy
c) A distant galaxy millions of light-years away
d) A dwarf galaxy orbiting the Milky Way
What is a major implication of Hubble’s Law regarding the early universe?
a) It was static and unchanging
b) It was much smaller and denser
c) It contained fewer galaxies
d) It had no expansion at all
Hubble’s Law relates the redshift of a galaxy to its:
a) Brightness
b) Composition
c) Recession velocity
d) Age
How does Hubble’s Law support the concept of an expanding universe?
a) It shows galaxies moving toward each other
b) It shows that farther galaxies move away faster
c) It explains the spiral shape of galaxies
d) It confirms the existence of dark matter
Which type of shift is used to measure the velocity of galaxies in Hubble’s Law?
a) Blueshift
b) Doppler shift
c) Redshift
d) Gravitational shift
What kind of galaxies did Hubble observe to form the basis of his law?
a) Nearby galaxies
b) Distant galaxies
c) Galactic clusters
d) Spiral galaxies only
According to Hubble’s Law, the greater the redshift, the:
a) Slower the galaxy is receding
b) Faster the galaxy is receding
c) More massive the galaxy is
d) Closer the galaxy is to Earth
What does Hubble’s Law suggest about the universe’s expansion rate in the past?
a) It was faster
b) It was slower
c) It has always been constant
d) It expanded at random rates
How is Hubble’s constant (H₀) related to the age of the universe?
a) The higher the constant, the younger the universe
b) The lower the constant, the younger the universe
c) The constant does not affect the age of the universe
d) The constant determines the size of the universe, not its age
Who was the first to propose the relationship between distance and velocity of galaxies, now known as Hubble’s Law?
a) Edwin Hubble
b) Albert Einstein
c) Georges Lemaître
d) Isaac Newton
Hubble’s Law provides a method for estimating the:
a) Mass of a galaxy
b) Age of the universe
c) Temperature of stars
d) Orbital speed of planets
Which type of galaxy violates Hubble’s Law because it is moving toward the Milky Way?
a) Andromeda
b) Triangulum
c) Sombrero
d) Whirlpool
How is the concept of “look-back time” related to Hubble’s Law?
a) It describes the time light from distant galaxies takes to reach Earth
b) It measures the current distance of galaxies
c) It explains the rotation speed of galaxies
d) It refers to the time galaxies start contracting
What did Hubble use to measure the distances to galaxies, forming the basis of his law?
a) Cepheid variable stars
b) White dwarfs
c) Supernovae
d) Black holes
Hubble’s Law is consistent with which cosmological principle?
a) The universe has a center
b) The universe is homogeneous and isotropic
c) The universe has a flat geometry
d) The universe is dominated by dark energy
What effect does the expansion of the universe, as described by Hubble’s Law, have on distant galaxies?
a) They move closer to the Milky Way
b) They remain stationary
c) They move away from each other
d) They collide with each other
Which type of distance is used in Hubble’s Law to relate the velocity of galaxies?
a) Parallax distance
b) Angular distance
c) Proper distance
d) Luminosity distance
Hubble’s Law supports the observation that the universe is expanding at an accelerating rate due to:
a) Dark matter
b) Dark energy
c) Black holes
d) Neutron stars
How does Hubble’s Law help calculate the approximate age of the universe?
a) By measuring the rotational speed of galaxies
b) By measuring the speed at which galaxies are moving away
c) By counting the number of galaxies
d) By analyzing the chemical composition of stars
Which mathematical formula represents Hubble’s Law?
a) v = H₀d
b) v = d / H₀
c) v = H₀²d
d) v = H₀/d
Which discovery of Hubble’s supports the concept of an expanding universe?
a) The blue shift of galaxies
b) The redshift of galaxies
c) The existence of exoplanets
d) The discovery of black holes
In Hubble’s Law, what does the recession velocity (v) of a galaxy depend on?
a) Its age
b) Its distance from Earth
c) Its luminosity
d) Its star formation rate
Hubble’s Law suggests that more distant galaxies move away from us:
a) At the same speed as closer galaxies
b) Slower than closer galaxies
c) Faster than closer galaxies
d) Not at all
What does Hubble’s constant represent in the study of the universe?
a) The temperature of space
b) The rate of expansion of the universe
c) The age of stars
d) The size of galaxies
What is the primary observational evidence for Hubble’s Law?
a) Brightness variations in galaxies
b) Redshift of distant galaxies
c) Formation of new stars
d) Evolution of black holes
Which phenomenon provides an exception to Hubble’s Law, showing galaxies moving toward each other?
a) Galactic collisions
b) Gravitational waves
c) Interstellar wind
d) Cosmic microwave background
In which year was Hubble’s Law first formulated?
a) 1920
b) 1929
c) 1940
d) 1965
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