An examination of longitudinal geography. The section focuses on the mathematical calculation of angular distances, spatial relationship with time zones, and the navigation properties of great circles.
The time at Cairo is 2 hours ahead of Greenwich. Hence, it is located at-
Correct Answer:
(B) 30° E longitude
Cairo (Egypt) is located at 30° 3’N latitudes and 31° 14’ E longitude. Time of Cairo is 2 hours ahead of Greenwich. Therefore, its position approximately falls near the 30° East longitude. The Earth being spherical in shape rotates on its axis by 360° in 24 hours. Therefore, its movement for 1° of longitude takes the time of 4 minutes. So, it can be easily calculated that in 120 minutes ( 2 hours) angle for longitude will be 30° , Therefore, option (b) should be the correct answer.
Ques: 2
When it is noon along 82° 30’ E longitude along what degree of longitude it will be 6.30 a.m.?
Correct Answer:
(C) At 0° East or West
When there is midday at 82°30' E longitude then 6.30 in the morning means there is the difference of 5:30 hrs in a time. As in one hour, change in longitude is 15° therefore 82°30' difference in 5:30 hours are 82° 30' – 82° 30' = 0° latitude.
Ques: 3
If the difference of longitudes for the two places is 90°, the time interval between these places will be –
Correct Answer:
(B) 6 hr
Generally, 1° longitude is equal to a difference of 4 minutes. 90° longitude means 90 × 4 = 360 minutes or 6 hours. Hence, (b) is the correct answer.
Ques: 4
Which one of the following longitudes along with the Prime Meridian forms a great circle on the globe.
Correct Answer:
(D)
180°
The Prime Meridian is the Zero degree line of longitude that passes near London. The Prime Meridian was accepted as Zero degrees longitude at an International conference in 1884. It is also known as Greenwich meridian. Just opposite to 0° longitude there is an Imaginary line located at about 180° E or W, as International Date Line which forms great Circle with Prime meridian along the Globe.
Ques: 5
Which one of the following has geographical position of 0° latitude and 0° longitude?
Correct Answer:
(A) In the South Atlantic Ocean
Null Island is a name for the area around the point where the prime meridian and the equator cross, located in the Gulf of Guinea (South Atlantic Ocean) off the west African coast. It has geographical position of 0° latitude and 0° longitude