Geographical Techniques Questions and Answers

Answer: A

A pie diagram is used to show the proportion of different land uses in an area, since each sector shows a share of the total.

A wind rose shows the direction and frequency of winds, a line graph shows change over time, and a flow chart shows the stages of a process, so none of them shows proportions of land use.

Answer: B

The mean, median and mode coincide if the distribution of values is normal, as the normal curve is symmetrical and has a single peak at the centre.

In a negatively or positively skewed distribution the three measures differ, and the Poisson distribution is skewed unless its mean is large, so only the normal one fits.

Answer: A

The contour interval followed in a Survey of India toposheet on the scale of 1:50,000 is 20 metres.

Intervals of 50, 100 and 150 metres are too coarse for this scale and suit smaller-scale maps.

Answer: C

The correct matching is GPS base with global location, pantograph with reduction and enlargement, planimeter with distance and area and stereoscope with three-dimensional vision, that is iii, iv, i, ii.

The other options mismatch the instruments, such as giving the stereoscope global location or the planimeter reduction and enlargement.

Answer: B

The most appropriate sampling technique for representing the heterogeneous population of a region is stratified random sampling, where the population is divided into homogeneous strata and a random sample is taken from each.

Cluster sampling suits groups that are similar to each other, systematic sampling spreads units at a fixed interval and purposive sampling relies on judgement, so they do not secure the representation of every different group.