All Free Everyday Science MCQs with Answers

101. What is the distance of the star Proxima Centauri from the planet Earth ________?

• A. 4.2 light years
• B. 3.2 light years
• C. 2.4 light years
• D. 1.5 light years

Explanation: Proxima Centauri is the nearest known star to the Sun after the Sun itself, at about 4.24 light-years from Earth. Therefore, 4.2 light-years is the appropriate rounded value.

102. Which is the Coldest Planet ?

• A. Earth
• B. Venus
• C. Mercury
• D. Uranus

Explanation: Uranus has the lowest recorded atmospheric temperature among the planets, reaching about −224°C. Although Neptune is farther from the Sun, Uranus has colder measured upper-atmosphere temperatures.

103. The distance between Earth and Sun is greatest during ____________?

• A. Apehelion
• B. Astronomical
• C. Lopsided
• D. Astronomi

Explanation: Aphelion is the point in Earth’s elliptical orbit at which Earth is farthest from the Sun, occurring in early July. Perihelion is the opposite point, when Earth is nearest the Sun.

104. Nearest star to the sun is: ___________?

• A. Proxima Centauri
• B. Alpha Scorpius
• C. Beta Orionis
• D. Vegetal

Explanation: Proxima Centauri is the nearest known star to the Sun, at about 4.24 light-years away. Alpha Scorpii and Beta Orionis are much more distant stars.

105. A solar eclipse occurs when _________?

• A. Venus between Earth and sun
• B. Moon is between Earth and sun
• C. Sun is between Earth and moon
• D. Moon is between Earth and Neptune

Explanation: A solar eclipse occurs when the Moon passes between the Sun and Earth and casts its shadow on Earth. The alignment must occur near a new moon.

106. _______ is the average distance between the Earth and the sun ?

• A. Moon unit
• B. Light unit
• C. Astronomical unit
• D. Solar unit

Explanation: An astronomical unit, or AU, is the mean Earth-Sun distance, approximately 149.6 million kilometres. The other units listed are not standard astronomical distance units.

107. The correct age of solar system is approximately __________?

• A. 4.3 Billion years
• B. 4.4 Billion years
• C. 4.5 Billion years
• D. None of these

Explanation: The solar system formed about 4.6 billion years ago, commonly rounded to approximately 4.5 billion years in general science questions. Thus 4.5 billion years is the closest listed choice.

108. The distance between the earth and the sun is smallest in the month of _________?

• A. February
• B. January
• C. December
• D. April

Explanation: Earth is closest to the Sun at perihelion, which occurs in early January, despite the Northern Hemisphere experiencing winter then. Seasons result mainly from Earth's axial tilt, not changing distance from the Sun.

109. What is the name of newsly discovered galaxy which may be the earliest and most distant galaxy ever discovered in April 2022?

• A. HD1
• B. GN-z11
• C. Milky way
• D. None of these

Explanation: HD1 was reported in April 2022 as a candidate for the most distant and earliest known galaxy, with light dating to roughly 330 million years after the Big Bang. GN-z11 was an earlier record-holder but was not the newly reported April 2022 candidate.

110. The second largest moon "titan" is belongs to which planet?

• A. Uranus
• B. Venus
• C. Saturn
• D. Mercury

Explanation: Titan is Saturn's largest moon and the second-largest moon in the Solar System after Jupiter's Ganymede. Its thick atmosphere makes it especially notable among moons.