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(ii) With reference to the average the distance of the, , sun, State:, , (a) The serial number of the planet earth., , Ans. The serial number of planet earth is 3., , (b) The average distance of the earth from the sun., , Ans. The average distance of the earth from the sun is, 147.33 * 10° Km, , (c) The time in which sunlight reaches the earth., , Ans. Sunlight takes 8 minutes to reach the earth.

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(ill) (a) Name the natural satellite of the earth., , Ans. Moon is the natural satellite of the earth., , (0) in how many days does the satellite complete one, revolution around the earth,, , Ans. Moon is the satellite of the earth. It completes, ‘one revolution in 27 1/3 days., , (¢) in how many days does the satellite rotates around, its onin axis., , Ans. Moon takes 27 days to rotate on its own axis., (d) How does the gravity of this satellite compare with, the earth,, , Ans. The gravitational pull of the moon is one-sixth, that of the earth., , (@) State the maximum temperature on the dayside, and minimum temperature on the night side, , of this satelite., , Ans On the dayside of the moon, the temp. could be as high, as 10°C, and on the night side of the moon the temp. could, , be as low as 50° C

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(iv) What do you understand by the following terms?, (a) New moon, , Ans. After the completion of one revolution around the, earth the moon comes in between the sun and the, earth and is not visible at that time, hence we see, darkness, this is called the new moon day. It is formed, before the crescent., , () Full moon., , Ans. When the earth comes in between the moon and, the sun, the moon appears to be full with bright light,, this is called full moon day. It appears on the, , fifteenth day of the new moon day. 3

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(v) (a) Define solar system., , Ans. The sun along with the eight planets and their, moons constitute the solar system., , (b) Name all the planets in the solar system in the, order of their distance from the sun., , Ans. Following are the names of the planets as per, their distance from the sun:, , 1. Mercury 2. Venus 3. Earth 4. Mars 5. Jupiter 6., Saturn 7. Uranus 8. Neptune, , Earlier Pluto was the ninth planet, which is now said to, , vanish from the solar system.

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(vi) (a) How many moons mars have?, Ans. Mars has 2 moons., (b) Write the names of these moons., , Ans. Photos and Deimos are the two moons of Mars. 5