Applications of Remote Sensing Questions and Answers

Answer: A

The rock that shows a light tone is Marble.

Tone on an aerial photograph or image depends on how much light the surface reflects. Marble, made of white or pale calcite and dolomite, reflects strongly and appears light in tone.

Basalt and dolerite are dark, fine to medium-grained mafic rocks rich in pyroxene and iron oxides, so they appear in dark tones. Magnetite quartzite (banded iron formation) contains abundant dark magnetite and also gives a dark tone.

Answer: C

Dendritic drainage appears on both sedimentary and igneous rocks.

Dendritic, tree-like drainage develops where the bedrock offers uniform resistance to erosion in all directions, so streams branch at random with no structural control. That happens on horizontally bedded sedimentary rocks and on massive igneous rocks such as granite, as well as on unconsolidated sediments.

So it is not confined to sedimentary rocks or to igneous rocks alone, and 'neither' is wrong. What the pattern indicates is homogeneity, not a particular rock type; trellis or rectangular patterns are the ones that point to structure such as folds or joints.