Chapter 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?
2. Use your brain power!
(a) How many rotations does the earth complete during one revolution around the sun?
(b) 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).
3. Fill in the blanks.
(a) The motion of the earth around itself is called _________________.
(b) The motion of the earth around the sun is called _________________.
(c) The rotation of the earth gives rise to _________________.
4. What is meant by each of the following terms ?
(a) Full moon
(b) New moon
(c) Lunar month
5. Answer the following questions.
(a) What is the equator?
(b) What are the two parts of the earth made by the equator?
6. Activity Find the names of the various ‘tithis’ using a calendar which shows them.
7. Can you tell?
(1) What is the name given to the changing shapes of the moon that we see?
(2) What are the names of the days on which we see a round moon and on which we see no moon at all?
8. Fill in the blanks:
1. The turning of an object around itself is called _________________.
2. The imaginary line around which an object rotates is called its _________________.
3. The imaginary circle at the centre of the Earth is called the _________________.
4. The two equal parts the equator makes of the earth are called the _________________and the _________________.
5. The period of time that the earth takes to complete one rotation is called a ___________.
6. A day has two parts, _________________ and _________________.
7. For the purpose of measuring time, we divide the whole day into 24 parts, each of which is called an _________________.
8. The period of time the earth takes to complete one revolution around the sun is called _________________.
9. There are about _________________ and _________________in a year.
10. A leap year and it has _________________ days instead of _________________ days and February has _________________ days instead of 28 days.
11. In the northern hemisphere, between _________________, the days are longer than the nights.
12. In the period from _________________, the days are longer than the nights in the southern hemisphere.
13. In India, _________________, _________________ and _________________ seasons are considered to be the main seasons.
14. We also divide the year into six seasons, namely, _________________, _________________, _________________, _________________, _________________ and _________________.
15. The cycle of six seasons is called the _________________.
16. The moon revolves around the _________________ and the earth revolves around the _________________.
17. The different shapes of the moon that we see are called the _________________ of the moon.
18. The fortnight from new moon to full moon is called the _________________ moon.
19. The fortnight ending on a full moon is that of the _________________ moon.
20. The waxing moon is called _________________ Paksha.
21. The fortnight from full moon to new moon is called the _________________ moon.
22. The fortnight that ends on a new moon is that of the _________________ moon.
23. The waning moon is called _________________ Paksha.
24. The period from one new moon to the next is called the _________________.
25. Every day of the lunar month is called a _________________.
26. The _________________ of the earth gives rise to day and night.
27. The _________________ of the earth and the inclination of its axis give rise to the cycle of seasons.
28. The revolution of the moon around the earth gives rise to the _________________ of the moon.
29. A _________________ month has about 28 to 30 days.
30. The period of the waxing moon and the waning moon together is called the _________________ month.
9. Answer the following questions:
1. Explain the terms:
b) axis of rotation
2. What is a leap year?
3. What is rituchakra? Name the seasons of the rituchakra.
4. When is it summer in the northern hemisphere?
5. When is it summer in the southern hemisphere?
6. Distinguish between:
a) rotation and revolution of the earth.
b) waxing and waning moon
For PDF click on the link.