Tag: space exploration

Questions Related to space exploration

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

Show answer
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$

Show answer
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

Show answer
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

Show answer
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. 

The largest planet in the solar system is _______.

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

  1. Saturn

  2. Jupiter

  3. Mars

  4. Earth

Show answer
Correct Option: B
Explanation:

The largest planet in the solar system is Jupiter. Radius is 71492km.

Ans: Jupiter

The soil in planet Mars appears to be red in colour 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. iron oxide

  2. cuprous oxide

  3. aluminium oxide

  4. silicon dioxide

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Correct Option: A
Explanation:

The soil in planet Mars appears to be red in colour due to the presence of iron oxide.

Ans: Iron oxide

Red planet:Mars; hottest planet:_______.

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

  1. Saturn

  2. Venus

  3. Mercury

  4. Jupiter

Show answer
Correct Option: B
Explanation:

Ans: Venus