Answer the following questions about time zones and location: a) Explain time gain/loss when traveling west of Greenwich. b) Is Mumbai's sunrise earlier than Greenwich? East or West longitude? c) Does

here are the answers to the questions:

4. Choose the correct answers—

• a) A traveller will have the feeling of loss/gain in his time, if he moves to the west of Greenwich as per the GMT.
  • The correct answer is $\boxed{\text{gain}}$. When moving west from Greenwich, you move to earlier time zones, so you gain time (the clock goes back).
• b) Mumbai has early sunrise than Greenwich therefore Mumbai is located at the east/west longitude.
  • The correct answer is $\boxed{\text{east}}$. Places to the east of the Prime Meridian experience sunrise earlier.
• c) Time in each longitude to the east of the Prime Meridian goes ahead/back by four minutes.
  • The correct answer is $\boxed{\text{ahead}}$. For every $1^\circ$ of longitude to the east, time moves ahead by 4 minutes.
• d) The east longitude of $83^\circ 20'/90^\circ/82^\circ 30'$ is accepted as the Indian Standard longitude.
  • The correct answer is $\boxed{82^\circ 30'}$. This is the standard meridian for Indian Standard Time (IST).
• e) The common watch that we wear runs according to the local time/Greenwich Mean Time/Indian Standard Time.
  • The correct answer is $\boxed{\text{local time}}$. Our watches typically show the local time of our current location.

5. Write down the differences between—

• a) Latitudes and Longitudes:
  • Latitudes are imaginary horizontal lines that run parallel to the Equator, measuring distance north or south. They range from $0^\circ$ to $90^\circ$ N/S.
  • Longitudes are imaginary vertical lines (meridians) that run from the North Pole to the South Pole, measuring distance east or west of the Prime Meridian. They range from $0^\circ$ to $180^\circ$ E/W.
• b) Local Time and Standard Time:
  • Local Time is the time of a specific place determined by the apparent position of the sun at that meridian. It varies from place to place.
  • Standard Time is the uniform time adopted for a country or a region, based on the central meridian of that area. It helps avoid confusion caused by varying local times.

6. Solve the following problem—

• a) When it is 7 hrs in Greenwich (as per the GMT), then in a particular place, it is 12 noon. Find out the longitude of that place.