Free Astronomy and Space MCQs with Answers

191. 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.

192. 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.

193. 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.

194. 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.

195. 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.

196. 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.

197. 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.

198. 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.

199. 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.

200. 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.