All Free Everyday Science MCQs with Answers

201. Lunar eclipse occurs on__________?

• A. New Moon
• B. Full Moon
• C. Half Moon
• D. Quarter Moon

Explanation: A lunar eclipse occurs when Earth comes between the Sun and Moon, placing the Moon in Earth's shadow. This alignment is possible only at or near the full-moon phase.

202. When Pluto was cast out from the list of Planets?

• A. September 24, 2006
• B. April 28, 2004
• C. January 26, 2006
• D. August 24, 2006Educational Resources

Explanation: The International Astronomical Union reclassified Pluto as a dwarf planet on 24 August 2006. It did not meet the requirement of clearing its orbital neighbourhood.

203. Which Planet is Called Great Red Spot?

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

Explanation: Jupiter has the Great Red Spot, a gigantic long-lived storm in its atmosphere. Mars is reddish in colour, but it does not have the Great Red Spot.

204. Which is the hottest planet in our Solar system?

• A. Venus
• B. Neptune
• C. Mars
• D. None of these

Explanation: Venus is the hottest planet because its dense carbon-dioxide atmosphere produces an intense runaway greenhouse effect. Although Mercury is closer to the Sun, it cannot retain heat as effectively.

205. Which one is Natural Satellite?

• A. Sun
• B. Moon
• C. Venus
• D. Mercury

Explanation: A natural satellite is a naturally occurring body that orbits a planet or another larger body; the Moon orbits Earth. The Sun is a star, while Venus and Mercury are planets.

206. Summer solstice means__________?

• A. longest day
• B. longest night
• C. smallest day
• D. none of these

Explanation: At a location's summer solstice, that hemisphere is tilted most toward the Sun, producing its longest daylight period and shortest night. In Pakistan and other Northern Hemisphere countries, this occurs around June 21.

207. Winter Solstice means____________?

• A. longest night
• B. longest day
• C. smallest night
• D. smallest day

Explanation: At a location's winter solstice, that hemisphere is tilted farthest from the Sun, giving it the shortest day and longest night. In the Northern Hemisphere, it occurs around December 21.

208. The Sun produces most of its energy by_____________?

• A. Nuclear fusion
• B. nuclear fission
• C. Burning hydrogen
• D. None of these

Explanation: The Sun's core produces energy through nuclear fusion, mainly joining hydrogen nuclei to form helium and releasing energy. This is not ordinary burning or nuclear fission.

209. Primary cosmic rays are composed largely of very fast__________?

• A. Protons
• B. Neutrons
• C. Electrons
• D. Gamma rays

Explanation: Primary cosmic rays consist largely of extremely fast protons, with smaller amounts of heavier atomic nuclei and electrons. Gamma rays are electromagnetic radiation rather than the main composition of primary cosmic rays.

210. The time taken by Sun to revolve around the center of our galaxy is___________?

• A. 150 million years
• B. 250 million years
• C. 300 millon years
• D. 350 millon years

Explanation: The Solar System takes roughly 225 to 250 million years to complete one orbit around the centre of the Milky Way, commonly called a galactic year. Therefore, 250 million years is the closest option.