The Himalayan Rivers

Correct answer: A. River continuing to cut its old course during mountain uplift

An antecedent river keeps its course even after uplift. Exam tip: connect it with Himalayan gorges.

Correct answer: B. They help provide water to the river throughout the year

Flow remains stable because water comes from both snowmelt and rainfall. Exam tip: remember the two water sources.

Correct answer: C. Vertical erosion on steep slopes

The upper course has steep slope and the river cuts downward. Exam tip: connect gorges with vertical erosion.

Correct answer: A. Their upper source region is linked with the Himalayas

River system classification is understood through source and upper course. Exam tip: focus on source region.

Correct answer: B. Jhelum Chenab Ravi Beas Sutlej

Jhelum Chenab Ravi Beas and Sutlej belong to the Indus system. Exam tip: remember them with the Punjab region.

Correct answer: C. Relation with the north western Himalayan region

Direct answer: C, relation with the north-western Himalayan region. Ladakh lies in India's far north-west, in the high Himalayan and trans-Himalayan region. The Indus is the major river associated with this area and flows through Ladakh before continuing westward. This shows that India's drainage is not limited to the Ganga-Brahmaputra system; the north-west also belongs to the Indus drainage system. A is wrong because the Indus is not identified by the Ganga delta. B is wrong because Ladakh is not part of the southern plateau. D is wrong because Ladakh is far from the eastern coastal plain. Memory cue: map link—Ladakh in the north-west, Indus in the north-west.

Correct answer: D. Devprayag

At Devprayag Bhagirathi and Alaknanda meet and are called Ganga. Exam tip: connect Devprayag with the naming of Ganga.

Correct answer: A. Both source stream and naming confluence are understood

Bhagirathi rises from Gangotri and gets the name Ganga at Devprayag. Exam tip: remember both source and confluence.

Correct answer: A. Change from strong upper erosion to slower plain flow

After Haridwar slope decreases and deposition becomes more likely. Exam tip: connect slope with river work.

Correct answer: B. It joins Ganga at Prayagraj

Yamuna joins the main Ganga channel so it is a tributary. Exam tip: understand tributary and distributary difference.

Correct answer: C. Different confluences show different river relations

Ganga Yamuna meet at Prayagraj and Bhagirathi Alaknanda meet at Devprayag. Exam tip: do not confuse confluence sites.

Correct answer: B. They are northern Himalayan tributaries of Ganga

These rivers bring water and sediment from the Himalayas to the Ganga plain. Exam tip: treat them as northern tributaries.

Correct answer: A. River bed becoming shallow due to heavy sediment

Heavy sediment can change the channel course and increase floods. Exam tip: connect Kosi with Bihar floods.

Correct answer: C. It joins Ganga from the southern highland side

The Son joins the Ganga system from the south. Exam tip: keep northern and southern tributaries separate.

Correct answer: A. Chambal joins Yamuna and Yamuna joins Ganga

Chambal is linked to the Ganga system through Yamuna not directly. Exam tip: understand indirect links.

Correct answer: C. Tsangpo Dihang Brahmaputra Jamuna

Brahmaputra is called Tsangpo in Tibet Dihang in Arunachal and Jamuna in Bangladesh. Exam tip: remember names with route.

Correct answer: B. High discharge heavy sediment and gentle plain slope

In Assam Brahmaputra forms a wide and flood prone channel. Exam tip: consider water sediment and slope together.

Correct answer: C. Sediment deposition and channel splitting at the mouth

Deposition in a delta can divide the main channel into distributaries. Exam tip: study delta and distributary together.

Correct answer: A. It is linked with delta deposits and mangrove area

Sundarbans is the famous mangrove region of the Ganga Brahmaputra delta. Exam tip: connect it with delta.

Correct answer: D. Deposition of alluvial sediments

Indus Ganga and Brahmaputra systems deposited sediments over a long time. Exam tip: connect plain formation with deposition.

Correct answer: A. Position of older and newer alluvial deposits

Direct answer: A, the position and age of older and newer alluvial deposits. Bhangar is the older alluvium of the northern plains. It generally lies on slightly higher terraces and is less frequently renewed by floods. Khadar is newer alluvium deposited in active floodplains; fresh silt may be added during floods, making it comparatively young and often fertile. Thus the difference is geomorphic and concerns the age, position and flood relationship of deposits. B is wrong because sea-wave height does not classify these inland alluvial surfaces. C is wrong because glacier thickness is not the basis of the distinction. D is wrong because volcanic ash heat is unrelated. Memory cue: Bhangar is old and higher; Khadar is new and nearer active floods.

Correct answer: A. Because fresh alluvial deposits are continually laid down during floods

Khadar is the newer alluvium found in river floodplains. During floods, rivers deposit fresh layers of silt, sand and other sediments, so Khadar is renewed repeatedly. In contrast, Bhangar is older alluvium, usually lying above the flood level and therefore not receiving fresh deposits regularly. Exam tip: remember Khadar as new floodplain alluvium and Bhangar as old alluvium.

Correct answer: C. Slope and velocity change

Erosion may dominate upstream and deposition downstream. Exam tip: connect slope with river work.

Correct answer: B. Gentle gradient, slower flow, lateral erosion and deposition

In the Ganga plain, the gentle gradient makes the river flow relatively slowly. It erodes laterally along the outer bank of a bend and deposits sediment along the inner bank. Together, these processes produce meanders. Steep gradients and vertical erosion are more typical of a river’s upper, mountainous course. Exam tip: associate meanders in plains with lateral erosion and deposition.

Correct answer: A. A large catchment can collect more water and increase flood risk

The direct answer is A: a large catchment can collect more water and increase flood risk. A catchment or drainage basin is the area from which precipitation and streamflow drain toward one river system. A Himalayan river with a large basin may receive water from rainfall, snowmelt, glaciers, and many tributaries. If heavy rain occurs over a wide area, many tributaries can send water into the main channel at the same time. The total discharge may then rise greatly, especially when the channel or floodplain cannot contain it. Option A is correct because it connects basin size with greater possible water collection and flood risk; it does not mean flooding occurs automatically every time. Option B is wrong because a larger catchment generally supplies more water, not necessarily dryness. Option C is wrong because a catchment remains a land drainage area and does not turn a river into a marine river. Option D is wrong because a basin does not become a glacier; a glacier is a mass of moving ice. Other factors, such as rainfall intensity, snowmelt, slope, land use, and drainage, also affect floods. Memory cue: bigger basin plus heavy rain plus many tributaries can mean greater flood discharge.