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

Which drainage pattern is seen in grid square 4085 and 4086?

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

Which drainage pattern is seen in grid square 3893?

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

The blue line in the main river indicates

1. A perennial
2. A thin perennial Nala
3. A thin water channel
4. A stream