All Free Everyday Science MCQs with Answers

191. Water has been discovered on which potentially habitable super-Earth ?

• A. K2-14d
• B. K2-15c
• C. K2-13a
• D. K2-18b

Explanation: K2-18b is a potentially habitable super-Earth whose atmosphere has been studied for water vapour and other gases. The similar-looking K2 catalogue names in the other options are the usual distractors.

192. The Saturn rings discovered by___________?

• A. Newton
• B. Robert Brown
• C. Galileo
• D. None of these

Explanation: Galileo first observed Saturn's rings through a telescope in 1610, although his telescope was not powerful enough for him to understand their true nature. Newton and Robert Brown were not the discoverers of the rings.

193. The Planet which revolves slowly around the Sun is__________?

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

Explanation: Neptune takes about 165 Earth years to complete one orbit, the longest orbital period among the eight planets. Its great distance from the Sun makes its revolution slow compared with the other options.

194. The "Rising" of the "evening star" indicates the direction of the____________?

• A. South Pole
• B. East
• C. West
• D. North

Explanation: Venus is called the evening star when it appears after sunset, and it is then seen in the western sky. The eastern appearance of Venus is called the morning star.

195. Ring planet is Saturn; least dense and 2nd largest planet is_________?

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

Explanation: Saturn is the second-largest planet after Jupiter and has the lowest average density of all the planets, even less than water. Its extensive ring system is another identifying feature.

196. The matter of our sun is in ________ state?

• A. Liquid
• B. Gas
• C. Solid
• D. Plasma

Explanation: The Sun is mostly ionised hydrogen and helium, in which atoms have lost electrons. This electrically charged state of matter is called plasma, rather than an ordinary gas.

197. Which of the following branch of Physics deals with the internal structure of earth?

• A. Biophysics
• B. Geophysics
• C. Plasma physics
• D. Atomic physics

Explanation: Geophysics applies physics to Earth, including its interior, rocks, gravity, magnetic field, and seismic activity. Biophysics studies living systems, while plasma and atomic physics concern different physical scales.

198. What is the date when day and night are equal?

• A. March 21 and December 24
• B. January 14 and September 23
• C. March 20 and September 23
• D. January 14 and June 22Chemistry

Explanation: Day and night are approximately equal at the two equinoxes, occurring around 20 March and 23 September. The exact calendar date can vary slightly from year to year, but option c gives the standard dates.

199. Science which deals with the position and movement of heavenly bodies ?

• A. Astrophysics
• B. Astronomy
• C. Astrology
• D. Astronautics

Explanation: Astronomy studies the positions, motions and physical properties of celestial bodies. Astrology claims that celestial positions influence human affairs, while astronautics concerns space travel.

200. How many times the sun is bigger than the size of the earth?

• A. 69 times
• B. 89 times
• C. 99 times
• D. 109 times

Explanation: The Sun’s diameter is about 109 times Earth’s diameter, which is the comparison intended by these options. By volume, however, about 1.3 million Earths could fit inside the Sun.