Latest MCQs on Universe for Competitive Exams

121. Which planet is known for its blue color due to methane in its atmosphere?
A) Uranus
B) Neptune
C) Saturn
D) Jupiter
Correct Answer: B) Neptune
Explanation: Methane in Neptune’s atmosphere gives it a blue hue.

122. What is the name of the first artificial object to reach interstellar space?
A) Voyager 1
B) Pioneer 10
C) New Horizons
D) Voyager 2
Correct Answer: A) Voyager 1
Explanation: Voyager 1 entered interstellar space in 2012.

123. Which planet is the farthest from the Sun in our solar system?
A) Uranus
B) Neptune
C) Pluto
D) Saturn
Correct Answer: B) Neptune
Explanation: Neptune is the most distant planet since Pluto’s reclassification.

124. What is the name of the process by which planets form from dust and gas in a protoplanetary disk?
A) Accretion
B) Fission
C) Fusion
D) Sublimation
Correct Answer: A) Accretion
Explanation: Accretion is the process of growth by accumulation of dust and gas.

125. Which planet has the greatest number of rings?
A) Saturn
B) Jupiter
C) Uranus
D) Neptune
Correct Answer: A) Saturn
Explanation: Saturn has the most extensive ring system.

126. What is the name of the first mission to land humans on the Moon?
A) Apollo 8
B) Apollo 11
C) Apollo 13
D) Apollo 17
Correct Answer: B) Apollo 11
Explanation: Apollo 11 landed the first humans on the Moon in 1969.

127. Which planet has the smallest mass?
A) Mercury
B) Mars
C) Venus
D) Earth
Correct Answer: A) Mercury
Explanation: Mercury is the smallest and least massive planet.

128. What is the name of the first spacecraft to orbit another planet?
A) Mariner 9
B) Viking 1
C) Pioneer 10
D) Voyager 1
Correct Answer: A) Mariner 9
Explanation: Mariner 9 orbited Mars in 1971.

129. Which planet is known for its bright white clouds of sulfuric acid?
A) Venus
B) Earth
C) Mars
D) Jupiter
Correct Answer: A) Venus
Explanation: Venus’s clouds are composed mainly of sulfuric acid.