geomorphology & earth landforms section 7 MCQ Questions & Answers Detailed Explanation

Answer: (a)

Answer: (b)

Answer: (d)

A great circle, also known as an orthodrome or Riemannian circle, of a sphere, is the intersection of the sphere and a plane that passes through the centre point of the sphere, as opposed to a general circle of a sphere where the plane is not required to pass through the centre.

The equator is the circle that is equidistant from the North Pole and the South Pole. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere. Of the parallels or circles of latitude, it is the longest, and the only ‘great circle’ (in that it is a circle on the surface of the earth, centred on the centre of the earth). All the other parallels are smaller and centred only on the earth’s axis.

Answer: (b)

The Vindhyan system of rocks is important for the production of precious stones and building materials. The system derives its name from the Vindhyan hills where its rocks are prominently exposed.

It forms a dividing line between the Ganga Plain and the Deccan. The main rocks of the Vindhyan system are coarse, medium and fine-textured sandstones, shales and limestones. The Vindhyan system of rocks bear out precious stones, ornamental stones, diamonds, building materials, and raw materials for cement, lime, glass and chemical industries

Answer: (d)

Answer: (b)

Epicenter is the point on the Earth’s surface that is directly above the hypocenter or focus, the point where an earthquake or underground explosion originates. Epicentral distance is used in calculating seismic magnitudes developed by Richter and Gutenberg.