Tag: planets and stars

Questions Related to planets and stars

Out of the following, which planet will take the most time to make 1 revolution around the Sun?

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Mercury

  2. Earth

  3. Jupiter

  4. Saturn

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Correct Option: D
Explanation:

The time period of revolution depends on the radius of the orbit. Greater the radius, greater is the period. Since Saturn is the farthest planet from the sun, its radius is the greatest and so is the time period.

Mars appears red due to the presence of ________ .

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Carbon oxide

  2. Nitrogen oxide

  3. Iron oxide

  4. Methane

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Correct Option: C
Explanation:

Reddish color of the Mars is due to the presence of "ferric" iron in the from of Red hematite $({ Fe } _{ 2 }{ O } _{ 3 })$ which is the oxide of iron.

_____ and ___ are the only planets without moons.

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Mercury,Venus

  2. Mars,Venus

  3. Jupiter,Saturn

  4. Earth,Mercury

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Correct Option: A
Explanation:

Planet                              Moons(Number)                                        

Mercury                              0
Venus                                 0
Earth                                   1
Mars                                   2
Jupiter                                67
Saturn                                 62
Uranus                                27 
Neptune                              14
Pluto                                    5

Only Venus and Mercury does not have any moon.

The following planet is considered as Earths-twin

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Mars

  2. Venus

  3. Mercury

  4. Saturn

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Correct Option: B
Explanation:

Venus is called Earth's twin because Venus and Earth are almost the same size, have about the same mass (they weigh about the same), and have a very similar composition (are made of the same material). They are also neighboring planets. However, Venus and Earth are also very different. Venus has an atmosphere that is about 100 times thicker than Earth's and has surface temperatures that are extremely hot. Venus does not have life or water oceans like Earth does. Venus also rotates backwards compared to Earth and the other planets.

Early astronomers were confused because the following planets sometimes reverse their direction:

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Mars

  2. Jupiter

  3. Saturn

  4. All of the above

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Correct Option: D

If earth suddenly stops rotating, then the weight of an object of mass $m$ at equator will [$\omega$ is angular speed of earth and $R$ is its radius ] :

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Decrease by $m\omega^2R$

  2. Increase by $  m\omega^2R$

  3. Decrease by $m\omega R^2$

  4. Increase by $  m\omega R^2$

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Correct Option: B
Explanation:
Weight when the earth rotates is
$m{g}^{\prime}=mg-mR{\omega}^{2}$
When $\omega=0$
The weight will increase by $mR{\omega}^{2}$

If you were asked to carry a 10 kg mass piece on each of the planets, select the planets in order, from the one where you would find it lightest to the one where it would be the heaviest

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Mercury-Venus-Earth-Mars-Jupiter

  2. Jupiter-Mars-Earth-Venus-Mercury

  3. Mercury-Mars-Venus-Earth-Jupiter

  4. Mars-Mercury-Venus-Earth-Jupiter

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Correct Option: A

Which of these pair of planets not have the satellites?

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Earth, mars

  2. Mars, Jupiter

  3. Uranus, neptune

  4. Mercury, venus

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Correct Option: D

The farthest planet in the solar system. 

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. Uranus

  2. Neptune

  3. Jupitor

  4. None of the above

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Correct Option: B
Explanation:

Neptune is the farthest planet in the solar system. 

In which part of the sky can you find Venus if it is visible as an evening star ? 

evs - i our earth and our solar system solar system and sun planets and stars planets sunita's experience in space space exploration

  1. eastern

  2. western

  3. northern

  4. southern 

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Correct Option: B
Explanation:

Venus can be seen in the western sky after sunset and is called the evening star.