Answer: Option B. -> 7500 kms
Answer: (b)
Length of coastline of India including the coastlines of Andaman and Nicobar Islands in the Bay of Bengal and Lakshadweep Islands in the Arabian Sea is 7517 km.
Length of Coastline of Indian mainland is 6100 km. Coastline of Indian mainland is surrounded by Arabian Sea in the west, Bay of Bengal in the east, and Indian Ocean in the south.
The long coastline of India is dotted with several major ports such as Kandla, Mumbai, Navasheva, Mangalore, Cochin, Chennai, Tuticorin, Vishakhapatnam, and Paradip.

Answer: Option B. -> Cretaceous Vulcanicity
Answer: (b)
Deccan traps are formed by the vast outpouring of basic lava from many linear fissures developed in the earth’s crust.
This outpouring was of the quiet type and hence did not create any volcanic domes. It just spread across the surface. This outpouring was in many active stages followed by periods of quiescence.
This outpouring took place around 65 million years ago when India was near present placed Madagascar and during its movement towards the north, it passed over Reunion Hotspot.
Presently this hotspot is dormant in nature. This outpouring lasted for 5million years approx according to the latest study.

Answer: Option D. -> Dhrian
Answer: (d)In Thar desert the shifting sand dunes are locally known as Dhrian.

Answer: Option D. -> Coromandel Coast
Answer: (d)

Answer: Option C. -> None of the above
Answer: (c)

Answer: Option A. -> Gibbon
Answer: (a)
The Hoolock Gibbon, the only ape species in India, is found in Assam, Arunachal Pradesh and Bhutan only. The Hoollongapar Gibbon Sanctuary, formerly known as the Gibbon Wildlife Sanctuary or Hollongapar Reserve Forest, is an isolated protected area of evergreen forest located in Assam, India.
The sanctuary was officially constituted and renamed in 1997. On 30 July 1997, in the notification, the sanctuary was constituted under the civil district of Jorhat and named it the "Gibbon Wildlife Sanctuary" after the only apes found in India: the hoolock gibbons (genus Hoolock).
It is the only sanctuary in India named after a gibbon due to its distinction for containing the densest gibbon populations in Assam.

Answer: Option A. -> Arunachal Pradesh
Answer: (a)

Answer: Option A. -> Tripura
Answer: (a)

Answer: Option B. -> 2 and 3
Answer: (b)

Answer: Option B. -> Igneous and metamorphic rocks
Answer: (b)
The Peninsular region is divided into the two parts by westward flowing Narmada river :
the Central Highlands and
the Deccan Plateau.
The Central Highlands make the northern part of the peninsular block. These highlands are made up of hard igneous and metamorphic rocks.