Free Astronomy and Space MCQs with Answers

41. 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.

42. 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.

43. 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.

44. ___________ is a star at the center of the solar system?

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

Explanation: The Sun is a star whose gravity holds the planets and other bodies in the solar system in orbit. It lies at the system’s centre.

45. The outermost layer of the sun is called __________?

• A. Coach
• B. Core
• C. Corona
• D. Comma

Explanation: The corona is the Sun’s extremely hot, thin outer atmosphere, extending millions of kilometres into space. It is especially visible during a total solar eclipse.

46. The sun is _________times bigger than the Earth.

• A. 105
• B. 107
• C. 109
• D. 111

Explanation: The Sun’s diameter is about 109 times Earth’s diameter, although its volume is roughly 1.3 million Earths. These questions usually use “times bigger” to mean diameter.

47. Comets revolves around?

• A. The sun
• B. The Moon
• C. The Earth
• D. Venus

Explanation: Comets are icy bodies that orbit the Sun, usually on highly elongated paths. Their tails become visible when solar heating releases gas and dust near the Sun.

48. The outermost layer of the Earth is called ____________?

• A. Crust
• B. Mental
• C. Core
• D. None of these

Explanation: The crust is Earth’s thin, rigid outermost layer, lying above the mantle and core. “Mental” is a misspelling of mantle, which is beneath the crust rather than at the surface.

49. The Planet of the solar system which has Maximum number of moons is___________?

• A. Jupiter
• B. Venus
• C. Saturn
• D. Uranus

Explanation: Saturn currently has the greatest number of confirmed moons in the solar system. Moon counts can change as new small satellites are discovered, but Saturn remains the expected answer here.

50. which human made object to venture into interstellar space?

• A. Apollo 1
• B. Sputnik
• C. Apollo II
• D. Voyager 1

Explanation: Voyager 1 crossed the heliopause and entered interstellar space in 2012, making it the first human-made object to do so. Apollo missions and Sputnik remained within the solar system.