All Free Everyday Science MCQs with Answers

41. The moon rotates on its axis in how many days?

• A. 14.8 days
• B. 17.5 days
• C. 29.7 days
• D. 27.3 days

Explanation: The Moon takes about 27.3 days to rotate once on its axis, equal to its sidereal orbital period around Earth. This synchronous rotation causes nearly the same lunar face to remain directed toward Earth.

42. How many countries are signatories of NASA's Artemis Accords as of May 2024?

• A. 29
• B. 30
• C. 40
• D. None of These

Explanation: The Artemis Accords reached 40 signatory countries in May 2024, setting shared principles for peaceful and sustainable exploration of the Moon, Mars and beyond. The figure is a count of countries, not a count of NASA missions.

43. The moon's surface is constantly bombarded by?

• A. Comets
• B. UV light
• C. Meteoroids
• D. All of the above

Explanation: Meteoroids continually strike the Moon and form many of its craters because the Moon has no substantial atmosphere to burn them up. UV light reaches the surface, but comets do not constantly bombard it, so “all of the above” is not suitable.

44. The moon's surface is also covered with a layer of fine dust called?

• A. Gegolith
• B. Megolith
• C. Regolith
• D. None of the above

Explanation: Regolith is the loose, powdery layer of dust and broken rock covering the Moon’s surface, produced mainly by countless meteorite impacts.

45. Which planets rotate in the opposite direction of the other planets?

• A. Saturn and Jupiter
• B. Jupiter and Neptune
• C. Saturn, Jupiter and Mercury
• D. Venus and Uranus Chemistry

Explanation: Venus and Uranus have retrograde rotation, meaning they spin opposite to the usual direction of planetary rotation. The word “Chemistry” after option d is an editing error, not part of the answer.

46. Terrestrial planets in solar system are made of____________?

• A. Metal
• B. Rock
• C. Both A and B
• D. None of the above

Explanation: Terrestrial planets have solid surfaces and are composed mainly of silicate rock with metallic cores. Therefore, both rock and metal are present.

47. Which four planets are also called the terrestrial planets?

• A. Inner planets (Mercury, Venus, Earth, and Mars)
• B. Outer planets (Jupiter, Saturn, Uranus, and Neptune)
• C. Inner planets (Mercury, Venus) and outer planets (Uranus, Neptune)
• D. Inner planets (Earth, Mars) and outer planets (Jupiter, Saturn)Astronomy

Explanation: The terrestrial planets are the four inner planets, Mercury, Venus, Earth and Mars. They are rocky and relatively small compared with the outer planets.

48. The sun has a __________ year solar cycle during which its activity increases and decreases.

• A. 10
• B. 11
• C. 12
• D. 13

Explanation: Sunspot activity rises and falls in an approximately 11-year cycle, with periods of solar maximum and solar minimum. This cycle affects solar flares and space weather.

49. The sun's atmosphere is divided into following three parts:-

• A. the photosphere, the leutosphere , and the corona
• B. the photosphere, the chromosphere, and the scislophere
• C. the photosphere, the chromosphere, and the corona
• D. None of the above

Explanation: The commonly identified visible layers of the Sun’s atmosphere are the photosphere, chromosphere and corona. The photosphere is the apparent surface, while the corona is the outermost layer.

50. The sun's surface is called ___________?

• A. Cromosphere
• B. Leutosphere
• C. Thermosphere
• D. Photosphere

Explanation: The photosphere is the bright visible surface from which most of the Sun’s light appears to come. The chromosphere and corona lie above it.