1. Name the only planet which has land, air and water? Ans: Earth
2. What is the earth shaped like?
Ans: Geoid (slightly flattened in the extreme north and south)
3. What is the spherical model of the earth called?
4. Which imaginary line divides the earth into the Northern Hemisphere and Southern Hemisphere?
5. What are the imaginary lines parallel to the equator going east-west direction called?
6. What are the set of lines running from the north pole to south pole called?
7. Which longitude is called the Prime Meridian?
Ans: Greenwich Line
8. How long is Indian Standard Time ahead of Greenwich Time?
Ans: 5 hours and 30 minutes
9. Which longitude is called the International Date Line?
Ans: 180 Degree
10. What are latitudes and longitude together useful for?
Ans: Locating places on the earth
11. In which atmosphere does the Tropic of Cancer lie?
Ans: In the Northern Hemisphere
12. What do we call the movement of the earth around the sun?
13. Which of these causes day and night – rotation or revolution?
14. What is the reason for the day and night not being equal throughout the year?
Ans: Inclination of the earth’s axis
15. Which are the two days in an year when day and night are almost equal?
Ans: Marth 21 and September 23
16. What is the chief reason for the change of seasons?
Ans: Revolution of the Earth
17. Who put forward the theory that the sun is motionless and earth rotated on its axis?
18. How old is the earth?
Ans: About 3500 million years
19. What is the elliptical path along which the earth moves around the sun called?
20. When it is winter in Europe, what season is it in Australia?
21. Which is the longest day in the Northern hemisphere?
Ans: June 21