All Free Everyday Science MCQs with Answers

111. Which planet of our solar system is name after a female?

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

Explanation: Venus is named after Venus, the Roman goddess of love and beauty. The other listed planets are named after male gods or figures.

112. The winter solstice in the southern Hemisphere occurs on __________?

• A. 22 December
• B. 23 September
• C. 21 June
• D. 22 March

Explanation: The Southern Hemisphere's winter begins around 21 June, when the Southern Hemisphere is tilted away from the Sun. This is the June or southern winter solstice.

113. The Summer solstice in the Northern Hemisphere happens on: __________?

• A. 21 July
• B. 22 December
• C. 22 March
• D. 21 June

Explanation: Around 21 June, the Northern Hemisphere is tilted toward the Sun, producing its longest day and the summer solstice. The exact date can vary slightly by year.

114. Selenology is the study of __________?

• A. Stars
• B. Galaxy
• C. Moon
• D. Planets.

Explanation: Selenology is the scientific study of the Moon, including its surface, composition, origin and geological history. Stellar science is astronomy, while the study of planets is planetary science.

115. What divides the Earth into the Northern and the Southern Hemispheres?

• A. Axis of rotation
• B. Equator
• C. North Pole
• D. South Pole

Explanation: The equator is an imaginary circle halfway between the poles and divides Earth into the Northern and Southern Hemispheres. Earth’s axis is the line around which it rotates, not the dividing circle.

116. Nearest star to sun is: __________?

• A. Proxima Centurai
• B. Alpha Scorpii
• C. Beta Orionis
• D. Vega

Explanation: Proxima Centauri is the nearest known star to the Sun, at about 4.24 light-years away. It is part of the Alpha Centauri star system, but it is closer than Alpha Centauri A or B.

117. The source of the Sun's energy is the process of ____________?

• A. Photoelectric emission
• B. Nuclear fission
• C. Nuclear fusion
• D. Thermionic emission

Explanation: In the Sun's core, hydrogen nuclei combine to form helium through nuclear fusion, releasing energy because a small amount of mass is converted into energy. Fission instead splits heavy nuclei and does not power the Sun.

118. The value of acceleration due to gravity is minimum on which of these planets?

• A. Mars
• B. Jupiter
• C. Mercury
• D. Neptune

Explanation: Mercury has the lowest surface gravity among these planets, about 3.7 m/s², narrowly below Mars. Jupiter and Neptune are much more massive and have stronger gravity.

119. An astronaut sees the colour of the sky as: _________?

• A. Blue
• B. White
• C. Red
• D. Black

Explanation: An astronaut in space sees a black sky because there is no atmosphere to scatter sunlight into different directions. Earth’s sky appears blue because atmospheric molecules scatter blue light more strongly.

120. Recently, scientists observed the merger of giant 'blackholes' billions of light-years away from the Earth. What is the significance of this observation?

• A. 'Higgs boson particles' were detected.
• B. Gravitational waves' were detected.
• C. Possibility of inter-galactic space travel through 'wormhole' was confirmed.
• D. It enabled the scientists to understand 'singularity'.

Explanation: Merging black holes disturb spacetime and produce gravitational waves that can be detected on Earth. This observation did not confirm wormholes or directly detect Higgs bosons.