CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
A location with standard time UTC−8 is:
A. 8 hours ahead of UTC
B. 8 hours behind UTC
C. 8 minutes behind UTC
D. On 8° W longitude exactly
Correct Answer: B
UTC−8 means local standard time is 8 hours behind UTC.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
For most everyday geographical time-zone calculations, UTC+5 means a place is:
A. 5 hours behind UTC
B. 5 hours ahead of UTC
C. 5 days ahead
D. At 5° E
Correct Answer: B
A positive UTC offset means local standard time is ahead of UTC by that amount.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
GMT is historically associated with mean solar time at:
A. 180°
B. 90° E
C. Greenwich
D. Equator
Correct Answer: C
Greenwich Mean Time is historically based on the Greenwich meridian.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
UTC is derived from International Atomic Time (TAI) and adjusted to remain related to:
A. Latitude
B. Earth's rotation
C. Earth's revolution only
D. Magnetic north
Correct Answer: B
UTC is derived from TAI with leap-second adjustments used to maintain relation with time based on Earth's rotation.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
Modern UTC is computed using data from:
A. Only sundials
B. Atomic clocks and international time laboratories
C. Ocean tides only
D. Weather stations only
Correct Answer: B
BIPM computes UTC from international clock and time-transfer data contributed by many laboratories and atomic clocks.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
UTC is primarily used as:
A. An international reference time scale
B. A latitude reference
C. A climatic index
D. A calendar month
Correct Answer: A
UTC is the international reference time scale used to coordinate civil time and technical systems worldwide.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
UTC stands for:
A. Universal Time Clock
B. Coordinated Universal Time
C. United Time Code
D. Central Universal Time
Correct Answer: B
UTC is the abbreviation for Coordinated Universal Time.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
If two cities have a local solar-time difference of 3 hours, their longitude difference is:
A. 30°
B. 45°
C. 60°
D. 75°
Correct Answer: B
3 hours × 15° = 45°.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
A place at 52°30′ E is ahead of Greenwich by approximately:
A. 2 h 30 min
B. 3 h 30 min
C. 4 h 30 min
D. 5 h 30 min
Correct Answer: B
52.5° × 4 minutes = 210 minutes = 3 hours 30 minutes.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
A place is 2 hours 20 minutes ahead of Greenwich in local solar time. Its longitude is approximately:
A. 30° E
B. 35° E
C. 40° E
D. 45° E
Correct Answer: B
2 h 20 min = 140 minutes. At 4 minutes per degree, 140 ÷ 4 = 35° E.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
If local noon occurs 20 minutes earlier than at Greenwich, the place is approximately:
A. 5° E
B. 5° W
C. 10° E
D. 10° W
Correct Answer: B
20 minutes ÷ 4 minutes per degree = 5°. Earlier time indicates west longitude.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
A longitude difference of 22.5° corresponds to:
A. 30 minutes
B. 1 hour
C. 1 hour 30 minutes
D. 2 hours
Correct Answer: C
22.5° ÷ 15° = 1.5 hours = 1 hour 30 minutes.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
A longitude difference of 7.5° corresponds to a time difference of:
A. 15 minutes
B. 30 minutes
C. 45 minutes
D. 1 hour
Correct Answer: B
15° equals 1 hour, so 7.5° equals 30 minutes.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
At 150° W, local solar time is how much behind Greenwich?
A. 8 hours
B. 9 hours
C. 10 hours
D. 12 hours
Correct Answer: C
150° ÷ 15° = 10 hours behind Greenwich.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
At 120° E, local solar time is how much ahead of Greenwich?
A. 6 hours
B. 8 hours
C. 10 hours
D. 12 hours
Correct Answer: B
120° ÷ 15° = 8 hours ahead.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
The local time at 45° E is 9:00 am. What is the local time at 15° W?
A. 5:00 am
B. 7:00 am
C. 11:00 am
D. 1:00 pm
Correct Answer: A
The difference is 60°. The western place is 4 hours earlier: 9:00 am − 4 hours = 5:00 am.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
The time difference between 90° E and 30° E is:
A. 2 hours
B. 4 hours
C. 6 hours
D. 8 hours
Correct Answer: B
The longitude difference is 60°; 60° ÷ 15° = 4 hours.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
If the local time at 75° W is 7:00 am, the time at Greenwich is:
A. 2:00 am
B. 7:00 am
C. 12:00 noon
D. 5:00 pm
Correct Answer: C
75° W is 5 hours behind Greenwich; add 5 hours to get 12:00 noon at Greenwich.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
If it is 8:00 pm at Greenwich, the local solar time at 60° E is:
A. Midnight
B. 4:00 pm
C. 10:00 pm
D. 2:00 am same date
Correct Answer: A
60° E is 4 hours ahead; 8:00 pm + 4 hours = midnight.
CSS - PMS - CCE - PCS - Geography
Time Zones and International Date Line
If it is 6:00 am at 45° E, the local solar time at Greenwich is:
A. 3:00 am
B. 6:00 am
C. 9:00 am
D. 12:00 noon
Correct Answer: A
45° E is 3 hours ahead of Greenwich, so Greenwich is 3:00 am.