Latest MCQs on Universe for Competitive Exams

111. Which planet is the densest in the solar system?
A) Earth
B) Jupiter
C) Mercury
D) Venus
Correct Answer: A) Earth
Explanation: Earth is the densest planet in the solar system.

112. What is the name of the first woman to travel into space?
A) Sally Ride
B) Valentina Tereshkova
C) Mae Jemison
D) Kalpana Chawla
Correct Answer: B) Valentina Tereshkova
Explanation: Valentina Tereshkova was the first woman in space in 1963.

113. Which planet has the shortest day in the solar system?
A) Jupiter
B) Saturn
C) Mars
D) Earth
Correct Answer: A) Jupiter
Explanation: Jupiter completes one rotation in about 10 hours.

114. What is the name of the region between Mars and Jupiter where many asteroids are found?
A) Kuiper Belt
B) Asteroid Belt
C) Oort Cloud
D) Van Allen Belt
Correct Answer: B) Asteroid Belt
Explanation: The Asteroid Belt lies between Mars and Jupiter.

115. Which planet is known as Earth’s “twin” due to its similar size and mass?
A) Mars
B) Venus
C) Mercury
D) Jupiter
Correct Answer: B) Venus
Explanation: Venus is similar in size, mass, and composition to Earth.

116. What is the name of the first American astronaut to orbit the Earth?
A) Neil Armstrong
B) John Glenn
C) Alan Shepard
D) Buzz Aldrin
Correct Answer: B) John Glenn
Explanation: John Glenn orbited Earth in 1962.

117. Which planet has the coldest average temperature in the solar system?
A) Uranus
B) Neptune
C) Saturn
D) Mars
Correct Answer: A) Uranus
Explanation: Uranus has the lowest average temperature.

118. What is the name of the process by which a star explodes at the end of its life cycle?
A) Nova
B) Supernova
C) Nebula
D) Quasar
Correct Answer: B) Supernova
Explanation: A supernova is a powerful explosion marking the end of a massive star’s life.

119. Which planet has the most circular orbit?
A) Venus
B) Earth
C) Mars
D) Jupiter
Correct Answer: A) Venus
Explanation: Venus has the least eccentric (most circular) orbit.

120. What is the name of the first reusable spacecraft?
A) Apollo
B) Space Shuttle
C) Soyuz
D) Gemini
Correct Answer: B) Space Shuttle
Explanation: The Space Shuttle was the first reusable spacecraft.