The main source of usable water on the Earth is

(1) Oceans

(2) Rivers

(3) Underground water

(4) Precipitation

Which of the following rivers lies in a rift valley?

(1) Luni

(2) Chambal

(3) Sone

(4) Tapti

What is meant by Isthmus?

(1) Mouth of a river where it joins the sea

(2) Narrow strip of water dividing two landmasses

(3) Narrow strip of land dividing two oceans

(4) Narrow strip of land connecting two large areas of land

Natural embankments found on upper valley sides are-known as

(1) high banks

(2) levees

(3) bunds

(4) ridge

Volcanoes are scattered

(1) all over the world

(2) only along the coasts

(3) on the islands

(4) mainly along young fold mountains

Which of the following minerals are required for smelting iron ore?

(1) Limestone and gypsum

(2) Manganese and limestone

(3) Limestone and coal

(4) Gypsum and coal

One of the following is not the result of underground water action

(1) Stalactites

(2) Stalagmites

(3) Sinkholes

(4) Fiords

The inner-most layer of the earth is known as

(1) Lithosphere

(2) Mesosphere

(3) Asthenosphere

(4) Barysphere

The temperature of water at the bottom of a large waterfall is higher than that of the water at the top. because

(1) the falling water absorbs heat from the Sun.

(2) the water at the bottom has greater potential energy

(3) the kinetic energy of the falling water is converted into heat.

(4) rocks on the bed of the river give out heat

Which one of the following is an igneous rock?

(1) Sandstone

(2) Shale

(3) Quartzite

(4) Granite

The greatest erosive power of a river is associated with

(1) gorges

(2) meanders

(3) inter-locking spurs

(4) V-shaped valley