All Free Everyday Science MCQs with Answers

171. Who discovered that the earth was not the center of the universe?

• A. Aristotle
• B. Nicolaus Copernicus
• C. Sir Isac Newton
• D. None

Explanation: Nicolaus Copernicus proposed the heliocentric model, placing the Sun rather than Earth at the centre of the planetary system. Aristotle supported the older Earth-centred view.

172. Sunsets on Mars are _________?

• A. Red
• B. Blue
• C. Yellow
• D. Orange

Explanation: Mars usually has blue sunsets because fine dust in its atmosphere scatters red light away from the setting Sun and allows bluish light to dominate near the Sun. This is opposite to the familiar reddish sunsets on Earth.

173. Only planet whose day is longer than its year is__________?

• A. Mercury
• B. Neptune
• C. Venus
• D. None of These

Explanation: Venus rotates so slowly that one rotation takes about 243 Earth days, whereas its orbit around the Sun takes about 225 days. Thus its sidereal day is longer than its year.

174. What is the name of the Active asteroid discovered near Jupiter?

• A. 2019 Jup1036
• B. 2019 JR10A
• C. 2019 LD2
• D. 2019 AA1

Explanation: 2019 LD2 is an active asteroid found near Jupiter's orbit. It attracted attention because it showed comet-like activity despite being classified as an asteroid.

175. An active asteroid is discovered near ________ Orbit for the first time in billion years.

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

Explanation: The reported active asteroid was discovered near Jupiter's orbit. Jupiter is the largest planet and has a broad region of small bodies associated with its orbital neighbourhood.

176. Sagittarius-A, the Blackhole at the centre of the Milky Way Galaxy is at a distance of_________?

• A. 25500 Lightyears
• B. 24500 Lightyears
• C. 23640 Lightyears
• D. 25640 Lightyears Physics

Explanation: Sagittarius A* lies roughly 26,000 light-years from Earth, and 25,640 light-years is the closest option. Modern estimates commonly give a value near 26,700 light-years.

177. The Renaissance scientist who explained how planets moved around the sun was

• A. Kepler
• B. Rebelais
• C. Francis Bacorr
• D. Gutenber

Explanation: Kepler used observations to formulate the three laws of planetary motion, showing that planets move in elliptical orbits around the Sun. His work refined the Sun-centred model of the Solar System.

178. The Proportion of Hydrogen to Helium in the Sun is________?

• A. 3:2
• B. 3:1
• C. 1:1
• D. 3:4Physics

Explanation: The Sun contains roughly three parts hydrogen to one part helium by mass, reflecting its composition as a hydrogen-fusing star. The item's option line is slightly garbled, but option b gives the standard approximate ratio.

179. Jupiter, Saturn, Uranus and Neptune are called_________?

• A. Jovian planets
• B. Terrestrial Planets
• C. Both A & B
• D. None of these

Explanation: Jupiter, Saturn, Uranus and Neptune are the four outer giant planets, commonly called Jovian planets. Terrestrial planets are the smaller rocky inner planets.

180. Mercury, Venus, Earth and Mars are called___________?

• A. Dwarf Planet
• B. Gaseous Planets
• C. Terrestrial Planets
• D. Both A & B

Explanation: Mercury, Venus, Earth and Mars have solid rocky surfaces, so they are called terrestrial planets. Dwarf planets are a separate classification based on their orbit and gravitational status.