1. Which of the following is/are true of world time zones? 1. The world is divided into thirty time zones 2. All time zones of the world are described in term of the number of hours difference between the standard meridian of that zone and the Greenwich Meridian 3. All countries have more than one time zone 4. The time for all places east of Greenwich is designated slow - and time for all places left of Greenwich is designated fast

2. When it is 12.00 noon at Delhi (77° 10'E) - people at another place on earth take their 6 o'clock morning tea. The longitude of that place is:[CDS 2001]

3. Which of the following are true regarding the crust of the earth? 1. It is the outer thin layer with a total thickness of about 100 km 2. It forms around 0.5 percent of the earth's volume 3. The outer covering of the crust is of sedimentary material 4. The lower layer of the crust consists of basaltic and ultra-basic rocks

4. Which one of the following is not the effect of the revolution of the Earth. [IAS 2003]

5. Albedo is defined as:

6. The Sun shines vertically on the equator:

7. If a solar eclipse occurs when the moon is quite far from the earth - the eclipse would be likely to be :

8. The distance of the equator from either of the poles is :

9. A person sets off from Alaska on a Tuesday and reaches New Zealand the next day which will be :

10. If the earth's direction of rotation is reversed - what would be the IST when it is noon at the International Date Line? [IAS 1997]

11. Which one of the following cities does not have the same clock time as that of the other three cities at any given instant? [IAS 2007]

12. The core of the Earth is made up of: [IAS 2003]

13. Consider a specific point on the surface of the earth (say Delhi). The temperature at a given time of day (say 12.00 Noon) will in general be higher in summer than in winter. This is because: [IAS 1993]

14. Which part of the earth's surface receives the highest amount of insolation?

15. In the earliest days when life originated on earth - the atmosphere contained : [UDC 1993]

16. The permanent tilt of the earth's axis and the revolution of the earth in its orbit together cause: 1. deflection of winds and ocean currents 2. differences in time between places on different meridians 3. varying length of day and night at different times of the year 4. changes in the altitude of the mid-day sun at different times of the year

17. Which of the following pairs is not correctly matched? [NDA 1993]

18. Owing to the equatorial bulge and the polar flattening - the polar radius of the earth falls short of the equatorial radius by about: [NDA 1991]

19. All the watches of a country are set according to :

20. The revelations of a satellite photograph of the earth are as follows: 1. the Southern hemisphere bulges slightly more than the Northern hemisphere 2. it is slightly pear shaped ellipsoid of rotation 3. the polar axis of the earth is slightly shorter than the equatorial axis 4. the equatorial circumference is about 40 - 000km Which of the above statements are correct ?

21. Days and nights are caused by : 1. rotation of the earth on its axis 2. revolution of the earth around the sun 3. inclination of the earth's axis

22. Who among the following was first to measure the circumference of the Earth? [NDA 2008]

23. Which one of the following is the correct sequence of the given Continents in the decreasing order of their percentage of Earth's land? [IAS 2005]

24. What is the correct sequence of the following in the context of the age of the earth since its origin? 1. Cenozoic 2. Mesozoic 3. Palaeozoic 4. Protozoic

25. The distance between the earth and the sun is smallest in the month of: