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Astronomy

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Solar System

easy2019Assistant Director FIA (BS-17) 2019
AstronomyFPSC

The bodyguard of the Earth is ___ that saves the Earth from many comets and asteroids.

A
Jupiter
B
Saturn
C
Uranus
D
None of these
Explanation and memory cue

Jupiter is often called the 'bodyguard' of Earth because its strong gravity attracts or deflects many comets and asteroids, reducing the number that might impact Earth. This protective role is well recognized in astronomy.

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Light year

easy2019Assistant Director FIA (BS-17) 2019
AstronomyFPSC

1 light year = ?

A
9.5 x 10 km
B
9.5 x 10⁹ km
C
9.5 x 10¹² km
D
None of these
Explanation and memory cue

A light year is the distance that light travels in one year, which is approximately 9.5 x 10¹² kilometers. This matches option C, making it the correct answer.

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Planets visibility

easy2019Assistant Director FIA (BS-17) 2019
AstronomyFPSC

The number of planets visible to us without using a telescope is:

A
3
B
4
C
5
D
None of these
Explanation and memory cue

There are five planets visible to the naked eye without a telescope: Mercury, Venus, Mars, Jupiter, and Saturn. Therefore, the correct answer is 5, which corresponds to option C.

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