Latest MCQs on Universe for Competitive Exams

101. Which planet has the most massive ring system?
A) Saturn
B) Jupiter
C) Uranus
D) Neptune
Correct Answer: A) Saturn
Explanation: Saturn’s rings are the most extensive and massive.

102. What is the name of the first human to walk on the Moon?
A) Yuri Gagarin
B) Neil Armstrong
C) Buzz Aldrin
D) Alan Shepard
Correct Answer: B) Neil Armstrong
Explanation: Neil Armstrong was the first person to walk on the Moon in 1969.

103. Which planet is the hottest in the solar system?
A) Mercury
B) Venus
C) Mars
D) Earth
Correct Answer: B) Venus
Explanation: Venus has a thick atmosphere that traps heat, making it the hottest planet.

104. What is the name of the galaxy closest to the Milky Way?
A) Triangulum
B) Andromeda
C) Whirlpool
D) Sombrero
Correct Answer: B) Andromeda
Explanation: The Andromeda Galaxy is the closest spiral galaxy to the Milky Way.

105. Which planet has the longest day (rotation period) in the solar system?
A) Venus
B) Mercury
C) Mars
D) Jupiter
Correct Answer: A) Venus
Explanation: Venus takes about 243 Earth days to complete one rotation.

106. What is the name of the first spacecraft to fly by Pluto?
A) Voyager 2
B) New Horizons
C) Pioneer 10
D) Cassini
Correct Answer: B) New Horizons
Explanation: New Horizons flew by Pluto in 2015.

107. Which planet has the greatest axial tilt, causing extreme seasonal variations?
A) Uranus
B) Neptune
C) Saturn
D) Venus
Correct Answer: A) Uranus
Explanation: Uranus is tilted at about 98 degrees.

108. What is the most abundant element in the universe?
A) Oxygen
B) Carbon
C) Hydrogen
D) Helium
Correct Answer: C) Hydrogen
Explanation: Hydrogen makes up about 75% of the universe’s elemental mass.

109. Which planet is known for its Great Red Spot, a giant storm?
A) Mars
B) Jupiter
C) Saturn
D) Neptune
Correct Answer: B) Jupiter
Explanation: Jupiter’s Great Red Spot is a massive, persistent storm.

110. What is the name of the process by which stars generate energy in their cores?
A) Nuclear Fission
B) Nuclear Fusion
C) Radioactive Decay
D) Chemical Reaction
Correct Answer: B) Nuclear Fusion
Explanation: Stars fuse hydrogen into helium, releasing energy.