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CBSE
(ABHI'S HOBBY PAGE)
THE EARTH IN OUR SOLAR SYSTEM
(Ans) All objects-sun,planets,moons and millions of bright objects seen during the
night which belong to the universe are called celestial bodies.
(Ans) The sun and the nine planets make up the family of the sun or solar system.
(Ans) Due to the presence of water on the earth it appears blue from the space.
Therefore it is called a blue planet.
(Ans) The moon takes 27days and 8 hours to complete one revolution around the earth.It
takes exactly the same time to complete one rotation on its axis.Therefore we see only one
side of the moon.
(Ans) Venus and Uranus rotate from east to west.
(Ans) Mercury takes less time in completing one revolution than the earth because it is
nearer to the sun.
2 Distinguish between:
(1)A Star and a planet
(Ans)
A
Star
A Planet
(1)A star has its own
light.
(1)A planet doesn't has its own light
(2)A star doesn't rotate
.
(2)A planet rotates
(3)A star doesn't revolve
.
(3)A planet revolves
(4)A star is
gaseous
(4)A planet is solid
(2)A planet and a satellite
(Ans)
A
Planet
A
Satellite
(a) A planet goes round the
sun
(1)A satellite goes round a
planet
(b) A planet is
big
(2) A satellite is small .
III Referring to Fig.1,make out correct pairs from the following two columns :
(a)The planet closest to
sun
(a)Mercury
(b)The biggest planet of the solar
system
(b)Jupiter
(c)The planet farthest from the
sun
(c)Pluto
(d)The planet identical to the earth in
size and
make-up
(d)Venus
(e)The star nearest to the
earth
(e)Sun
(f)The celestial body closest to the
earth
(f)Moon
IV Describe the composition of the solar system.
(Ans)The sun,the nine planets along with their satellites make up the solar system.
These nine planets are Mercury, Venus, Earth, Mars, Jupiter, Satrun, Uranus, Neptune and
Pluto. All these planets have 49 satellites.
(V) Why is the Earth a unique planet in the Solar System?
(Ans)Earth is a unique planet because there is water, air and life is possible here.
