What is meant by BM 224 in grid square 4485?

1. It is Bench Mark, cut on a rock wall or a building showing the height of that mark above sea level is 224 m
2. It is Benchmark, 224 m above sea level
3. The height of the point where it is written
4. It is the height of the sand dune above sea level

What does the number 158 in the grid square 2189 indicate?

1. A spot height of 158 m
2. Height of the surveyed tree above sea level is 158 m
3. A prominent survey point shown as surveyed tree at the height of 158 m above sea level
4. Surveyors mark is 158

In grid square 6827, the double dotted line means

1. A road in the forest
2. A clearing made in the forest to prevent spread of fire called fire line.
3. An unmetalled road to cross the forest
4. Clearing the forest for farming purpose

Which drainage pattern is seen in grid square 3893?

1. Radial
2. Dendritic
3. Trellised
4. Intermittent