Astronomy – Solar System and Planets GK MCQs With Answer & Explanation in English

1. The only planet that shows phases is:?

  1. Earth
  2. Venus
  3. Jupiter
  4. Saturn

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Answer: Venus

Through a small telescope, it is possible to see Venus undergo phases, just like the Moon. This occurs because, from our point of view on Earth, we see only the parts of Venus that are illuminated by sunlight at any given time. However, unlike the Moon, Venus is usually brighter to our view in its crescent phase than in its full phase.

2. Who discovered the rings of Saturn?

  1. Galileo
  2. Newton
  3. Edmund Halley
  4. Einstein

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Answer: Galileo

Galileo Galilei was the first to observe the rings of Saturn in 1610 using his telescope. He called them Saturn’s ears.

3. Titan is the largest moon of:?

  1. Uranus
  2. Jupiter
  3. Saturn
  4. Earth

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Answer:  Saturn

Titan is the moon of Saturn. It is the largest moon of Saturn and the second-largest natural satellite in the solar system.

4. Which among the following comets is seen every 75-76 years?

  1. Halley’s Comet
  2. Holme’s Comet
  3. Donati’s Comet
  4. Orion

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Answer:  Halley’s Comet

Halley’s Comet is one of the most famous comets. It is a “periodic” comet. It returns to Earth’s vicinity about every 75 years, and this makes it possible for a human to see it twice in his or her lifetime. The last time it was here was in 1986, and it is projected to return in 2061.

5. On which of the following the weight of a person will be minimum?

  1. Venus
  2. Mars
  3. Moon
  4. Mercury

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Answer: Moon

100 kg on Earth is equivalent to 16.6 kg on the Moon and 37.8 kg on Mercury.

6. Heliopose is the theoretical boundary beyond which ____:

  1. Light from Sun cannot reach
  2. Heat from Sun cannot reach
  3. Solarwinds cannot reach
  4. No existence of Solar system

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Answer: Solarwinds cannot reach

Heliopose is the theoretical boundary beyond which SolarWinds cannot reach. The heliosphere is the vast, bubble-like region of space which surrounds and is created by the Sun.

7. Which among the following planets in the Solar System has the fastest rotation?

  1. Mercury
  2. Venus
  3. Mars
  4. Jupiter

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Answer: Jupiter

Jupiter is the planet that has the fastest rotation. It has an orbital period of 12 years. It is the fifth planet from the sun.

8. Which among the following is not a dwarf planet?

  1. Ceres
  2. Pluto
  3. Neptune
  4. Eris

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Answer: Neptune

A dwarf planet is defined as a celestial body revolving around a star with enough mass to have hydrostatic equilibrium but not enough mass to clear its path around the parent star. Examples of dwarf planets include Ceres, Pluto, Eris, Haumea, etc. Neptune, on the other hand, is a full-fledged planet.

9. New Horizons’ spacecraft was launched by NASA to study which of the following planets?

  1. Mars
  2. Pluto
  3. Jupiter
  4. Mercury

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Answer: Pluto

The New Horizons was launched from Cape Canaveral Air Force Station to study the surface of Pluto. It was the fastest man-made object ever launched from Earth.

10. What is the rank of Earth in the Solar system in terms of mean Radius?

  1. 1st
  2. 3rd
  3. 5th
  4. 7th

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Answer: 5th

The rank of Earth in terms of mean radius is 5th. Jupiter, Saturn, and Uranus are the top 3 with on the basis of mean radius.

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