Free Astronomy and Space MCQs with Answers

171. 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.

172. 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.

173. 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.

174. In which type of solar eclipse the Sun's center is covered by the moon, leaving its edges uncovered?

• A. Partial Solar Eclipse
• B. Total Solar Eclipse
• C. Annular Solar Eclipse
• D. None of the above

Explanation: An annular eclipse occurs when the Moon passes centrally in front of the Sun but appears too small to cover it completely, leaving a bright ring around its edge. In a total eclipse, the Sun's visible disk is fully covered.

175. Almost identical eclipses occur after 18 years and 11 days. This cycle is known as__________?

• A. Partial Eclipse cycle
• B. Total Eclipse Cycle
• C. Saros Cycle
• D. None of the above

Explanation: The Saros cycle is approximately 18 years, 11 days and 8 hours, after which similar Sun, Moon and Earth geometry produces a closely related eclipse. The extra hours shift the eclipse path geographically.

176. Day and night are the results of__________?

• A. Earth rotation around its axis
• B. Earth revolution
• C. Earth rotation accompanied with its revolution.
• D. None of these

Explanation: Earth's rotation makes different regions face toward or away from the Sun, producing the regular cycle of day and night. Revolution around the Sun mainly causes the yearly seasons.

177. How many longitudes are there in Globe?

• A. 90
• B. 180
• C. 270
• D. 360Physics

Explanation: The globe is divided into 360 degrees of longitude, with each meridian representing a line of longitude. The 180-degree east and 180-degree west designations meet at the same opposite meridian.

178. Which Planet is known as Watery Planet?

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

Explanation: Earth is called the Watery Planet because about 71% of its surface is covered by oceans and other water bodies. The other listed planets have much less surface water.

179. Vernal equinox of northern hemisphere in March marks season of __________ ?

• A. Spring
• B. Summer
• C. Winter
• D. Autumn

Explanation: The March vernal equinox marks the beginning of spring in the Northern Hemisphere. It occurs when day and night are approximately equal in length.

180. The light of distant stars is affected by __________ ?

• A. The earth's atmosphere
• B. Interstellar dust
• C. both A and B
• D. None of these

Explanation: Starlight can be scattered and absorbed by Earth’s atmosphere and weakened or reddened by interstellar dust. Therefore, both listed factors can affect light from distant stars.