Question

Which is the longest tributary of the Indus?
1. Ravi
2. Beas
3. Chenab
4. Jhelum

Answer 1

Hint: If a river flows into a second river, then a tributary of the second river is the first river. A water body that flows into another body of water is a tributary.River Indus is an excellent trans- Himalayan river in Asia. It covers a large area in South Asia.

Complete answer:
The drainage area of Indus river is about 1165000 square km. It lies in the foothills and ranges of the Hindu Kush, Himalayas, and Karakoram Range. It also lies in the semi-arid plains of Pakistan. 

About 58 cubic miles is the river's annual flow. The river's name is derived from a Sanskrit name from Tibet. In the ancient Vedas, the mention of the river is seen. This river rises from the autonomous region of China near Lake Mapam in southwestern Tibet. It crosses the southwest boundary of Kashmir and flows about 200 miles North West.

The river Shigar joins the river Indus near the banks of Skardu in Baltistan. The river Indus gets most of its tributes from the eastern Punjab plain. The river becomes larger after it receives the water from Punjab, and during the flood season, it is complete.

1. Ravi: The Budhil and Nai or Dhona join the major tributaries of the Ravi River 64 kilometers (40 mi) downstream from its source. Thus, this option is incorrect.

2. Beas: The Beas River flows south through the Kullu Valley, receiving tributaries from flanking mountains, and then turns west to flow into the Kangra Valley past Mandi. Thus, this option is incorrect.

3. Jhelum: The Jhelum river is an Indus River tributary and has a total length of approximately 725 kilometres (450 mi). But, this is not the largest tributary of river Indus. Thus, this option is incorrect.

4. The Chenab River is the largest tributary of the river Indus. It has a total length of about 605 miles (974 km), and it also feeds irrigation canals. The Chenab empties into the River Sutlej.

Thus, option 3. Chenab is the correct answer.
Note:
1.The Indus, also referred to as the Sindhu, It originates from a glacier in the Tibetan area near Bokhar Chu at an altitude of 4,164 m in the Kailash Mountain range.
2. It is known in Tibet as 'Singi Khamban, or the mouth of the Lion. It passes through Ladakh and Baltistan after flowing in the northwest direction between the Ladakh and Zaskar ranges.
3. In Jammu and Kashmir, it cuts through the Ladakh range, creating a spectacular gorge near Gilgit. Near Chillar in the Dardistan zone, it enters Pakistan.