Answer: A

Explanation:

The western coastal plains are examples of submerged coastal plains. Due to being submerged, the western coastal plain is only a narrow strip and provides natural conditions for the development of ports and harbours. Hence, option (a) is the correct answer.

Answer: C

Explanation:

The Kosi is a precipitous river whose source is north of Mount Everest in Tibet, from where its main stream, the Arun, originates. This is called the sorrow of Bihar. It has been notorious for changing its course. Hence, statement 1 is correct.

In Nepal, after crossing the Central Himalayas, it is joined by Son and Kosi from the west and Tamur Kosi from the east. It joins the Arun river to form Saptakosi. This river brings huge amount of sediment from the upper areas of the mountains and deposits it in the plains. Due to this, the path of the river gets blocked and as a result the river changes its course. Hence, statement 2 is correct.

Answer: C

Explanation:

The Tropic of Cancer runs from east-west through the middle of India. The southern part of the country, south of the Tropic of Cancer, is tropical. The northern part of the country, which is north of the Tropic of Cancer, is subtropical, which is why India experiences both tropical and subtropical climates. Hence, statement 1 is correct.

The latitudinal extension of India is from about 8º4'N to 37º6'N, the longitudinal extent is from about 68º7'E to 97º25'E, which is about 30 degrees from north to south and from west to east. Hence, statement 2 is correct.

Answer: B

Explanation:

The boundary separating one drainage basin from another is called a watershed or watershed. On the basis of the size of the watershed area, Indian drainage basins have been divided into three parts – major river basins, medium river basins and minor river basins. Hence, statement 1 is incorrect.

Major river basins with a drainage area of more than 20,000 square kilometres. It includes 14 river basins, such as Ganga, Brahmaputra, Krishna, Tapi, Narmada, Mahi, Pennar, Sabarmati, Barak etc. Medium river basins whose drainage area is 2,000 to 20,000 square kilometers.

It has 44 river basins, such as Kalindi, Periyar, Meghna etc. Small river basins, whose drainage area is less than 2,000 square kilometers. It includes many rivers flowing in areas of low rainfall. Hence, statement 2 is incorrect and statement 3 is correct.

Answer: C

Explanation:

The northern and north-eastern ranges include the Himalayan mountains and the north-eastern hills. There are many parallel mountain ranges in the Himalayas. The major ranges in it are the Greater Himalayas, Trans Himalayan ranges, Central Himalayas and Shivaliks. In the north-western part of India, these Himalayan ranges extend from north-west to south-east direction. Hence, statement 1 is correct.

In the Darjeeling and Sikkim regions these ranges extend in the east-west direction while in Arunachal Pradesh they rotate from south-west to north-west. These hills spread in north-south direction in Nagaland, Mizoram and Manipur. The Great Himalayan Range, also known as the Central Axial Range, has an east-west length of approximately 2,500 kilometers and a north-to-south width of 160 to 400 kilometers. Hence, statement 2 is correct.