Ch.2 Motions of the Earth

Chp 2. MOTIONS OF THE EARTH

 

1. What’s the solution ?

Amit wants to take his granny to Australia which is in the southern hemisphere. But she cannot bear very cold weather. When should they make this trip ?

Ans. (a) Amit’s granny cannot bear cold weather. Hence, she should visit Australia during summer. (b) Australia is situated in the southern hemisphere. It experiences summer season during the period of 23rd September to 22nd March. (c) Considering this, they should make the trip to Australia anytime between October to mid-March.

 2. Use your brain power!

(i) How many rotations does the earth complete during one revolution around the sun?

 Ans: The earth completes one rotation in 1 day. It takes 365 days and 6 hours i.e., 1/4 day to complete one revolution. This means, during one revolution around the sun, the earth performs 365 and 1/4 rotations.

 (ii) It is sunrise at Itanagar in Arunachal Pradesh. Write the names of the following cities in the order in which the sun will rise there. Mumbai (Maharashtra), Kolkata (West Bengal), Bhopal (Madhya Pradesh), Nagpur (Maharashtra).

Ans: The earth rotates from west to east. The sunrise is observed earlier in the eastern states and gradually it is seen by western states of India. The order in which the sun will rise in the given cities is: Itanagar (Arunachal Pradesh), Kolkata (West Bengal), Nagpur (Maharashtra), Bhopal (Madhya Pradesh) and Mumbai (Maharashtra)

3.Fill in the blanks

(You must write the answers for this question on your own)

4. What is meant by each of the following terms?

 (i) Full moon (ii) New moon (iii) Lunar month (iv) Tithi

 Ans: (i) Full moon: When a complete and round moon is seen in the sky, it is called as full moon.

 (ii) New moon: When the moon is not at all visible in the sky from the earth, it is called as new moon.

 (iii) Lunar month: The duration of 28 to 30 days between a new moon to the next new moon is called a lunar month.

 (iv) Tithi: Every day of the lunar month is called as tithi.

5. Answer the following questions.

(i) What is the equator?
 Ans: (i) An imaginary circle around the surface of the earth, exactly in between the north and south poles is called the equator.

(ii) What are the two parts of the earth made by the equator ?

Ans: The two parts of the earth made by the equator are: (a) Northern hemisphere (b) Southern hemisphere

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