Q. Which among the following is the only Western entrance to the highlands of Ladakh?
Answer: Zoji La
Notes: Banihal is an important pass connecting the hill areas of Jammu to the Kashmir Valley. The Jawahar Tunnel (named after Pandit Jawaharlal Nehru), inaugurated in December 1956, was constructed for round-the-year surface transport. 
Zoji La lies between the valley of Kashmir and the Kargil district, and is the only Western entrance to the highlands of Ladakh. Rohtang Pass in Himachal Pradesh, India.
Mohan Pass is the principal pass in the Shiwalik Hills, the southernmost and geologically youngest foothills running parallel to the main Himalayas in Sikkim.
Kora La at 4,594 meters elevation on the Nepal-Tibet border at the upper end of Mustang. The Kali Gandaki Gorge transects the main Himalaya and Transhimalayan ranges. Kora La is the lowest pass through both ranges between K2 and Everest, but some 300 metres higher than Nathula and Jelepla passes further east between Sikkim and Tibet.
Aghill Pass: Situated to the north of K2 in the Karakoram at an elevation of 5000 meters, joins Ladakh with the Xinjiang Province of China. Bara-Lacha: Bara-lacha la also known as Bara-lacha Pass is located in the Zanskar range connecting Lahaul district in Himachal Pradesh to Ladakh in Jammu and Kashmir, situated along the Leh-Manali highway.
Bomdi-La: It connects Arunachal Pradesh with Lhasa, the capital of Tibet.
Chang-La:
The Changla Pass or Chang La Pass (el. 5,360 m is located in Ladakh, India. It is the third highest motorable road in the world.
Debsa Pass: Debsa Pass is a 5,360-metre (17,590 ft) high mountain pass in the Himalaya mountains between the Kullu and Spiti Districts of Himachal Pradesh.
Dihang-Debang: Situated in the state of Arunachal Pradesh at an elevation of about 4000 feet this pass connects Arunachal Pradesh with Mandalay (Myanmar). The Dihang-Debang Biosphere reserve is located around this area.