Himalayas in the north-eastern part of India is known as _________.
A. Himadri
B. Purvanchal
C. Himachal
D. Shiwaliks

Hint: It is made up of sandstone, i.e. sedimentary rocks. The range is covered with thick forests consisting of parallel ranges and valleys. The hills are convex to the west.

Complete Answer:
Option A - Himadri’ is also referred as the Great Himalayas or the Higher Himalayas in the northernmost part of the Himalaya range acting as the backbone and the longest belt. The range has a height of 20,000 feet covering the northern portion of India and the entire Nepal. Thus, it is not the correct answer.
Option B – Purvanchal is also known as the Eastern Himalayas with an area of 94,800 square kilometers extended in the north eastern states such as Nagaland, Manipur, Tripura, Mizoram etc. The hills of this also extends to the border of India and Myanmar. So, it is the appropriate answer.
Option C – Himachal’ is well known as the Lesser Himalayas or the Lower Himalayas with a height of 12000 to 15000 feet. The range extends its arms from southeast of Pakistan through the states of Jammu and Kashmir, Himachal Pradesh, western Uttar Pradesh and Nepal. So, it is not the correct answer.
Option D - Shiwalik’ is also known as the Outer Himalayas extending from west to northwest in the state of Sikkim through Nepal and into northern Pakistan with a height of 3000 to 4000 feet. The name ‘Shiwalik’ means ‘belonging to God Shiva’. Thus, it is not the correct answer.

Therefore, the correct answer is Option B.

Note: The major hills of Purvanchal are:
- Dafla Hills
- Abor Hills
- Mishmi Hills
- Patkai Bum Hills
- Naga Hills
- Manipur Hills
- Mizo Hills
- Tripura Hills
- Mikir Hills
- Garo Hills
- Khasi Hills
- Jaintia Hills