sample questions part 2

SCIENCE IN SOCIETY
Sample questions for 3rd term exam
2nd part

5. This is a view of the sky on the 10th of February (don’t matter which year -every year is the same-) from a place 40º N
a. At which time has been taken this view? (give GMT time and local time). Remember that February is winter time.
b. On which date can be seen this very view at 00.00 hours (GMT)



6. Answer these questions related with the calculation of our local meridian line.
a. If sunrise happens in....................... and sunset in ............., the Sun at noon will be in the direction of ...................

b. If Sun is rising in the sky after sunrise and goes down before sunset, at ....................... it is at its maximum height.

c. Is for that that at noon the shadow of any vertical object is …………..

d. Taking into account the answers to questions b to c, explain how can we obtain the North-South direction (the meridian of the place)

7. You are in front of a sundial at 14 hours in your watch, but the sundial marks 12 minutes to noon. Explain why. Is it summertime or wintertime?


8. What is special about Greenwich meridian? What is the difference with other meridians? Are they natural differences or artificial?


9. What is the time zone of Spain?


10. What does it mean the acronym GMT applied to time?


11. How long is a day in the Earth? Is every day of the year equal to any other in duration? Why?


12. Define a year. How many days does it have?


13. How many days does a sidereal year have in the Earth? How long is a sidereal day?


14. A soldier in his training course is left in an unknown place in the desert. He wants to know where he is and with the aid of a stick he draws the local meridian line and in addition he calculates that the Sun height at solar noon is 83º. His watch shows GMT time and he realizes that at local solar noon his watch marks 11:24 hours. It is the 12th of May and the solar declination of the day is 18º and the equation of time -4 minutes.
a. What is the Longitude of the place he is
b. What is the latitude of the place? Is it East or West from Greenwich meridian?