NCERT 6th Class (CBSE) Social Science: Maps and Map Reading

Question: What are the main limitations of glob?

Answer: A glob has the following limitations:

1. It is difficult to carry a globe.
2. The space on the globe is limited and details cannot be show on it.
3. A globe cannot be made for a part of the earth.
4. Details of the geographic features cannot be shown properly.
5. It is not only difficult to make a big size globe but also to handle it.

Question: What are the advantages of a mariner’s compass?

Answer: A magnetic compass is also used to find the north. The needle of the magnetic compass always points towards north-south direction. This compass is also called mariner’s compass and it is used by mariner’s to find direction while sailing.

Question: Describe the different methods of showing scale on a map.

Answer: The different methods of showing scale on a map are:

1. By a statement: In this method the scale is given in words, such as one cm is to two km or 1 cm = 2 km. In this statement, 1 cm is the map distance and 2 km is the corresponding ground distance. This is a quick method of using the scale for showing distances.
2. By a Numerical Fraction: It is the method also called as represent active fraction or R.F. In this method, the ratio between the map distance is give as a fraction. The numerator is always one. R.F = Map distance/Ground distance.
3. By a Graphic or Linear Scale: In this method the map distance is shown with the help of a straight line. The line is divided into parts called primary division. The first primary division is further subdivided into secondary divisions.