DAY-5 CLASS-7 SOCIAL L-2 QUIZZ

What is the main focus of the learning material titled "Our Changing Earth: Action of Rivers"?

• The remarkable landforms sculpted by rivers from source to sea

• The history of mountain formation

• The types of plants found near rivers

• The climate changes in river valleys

Which natural feature is highlighted as shaping landforms from source to sea in the material?

• Rivers

• Oceans

• Deserts

• Glaciers

Imagine you are planning a field trip to study upper course landforms. What features would you expect to observe in a region with both V-shaped valleys and spectacular waterfalls, and why?

• Flat plains and sand dunes, because they are common in upper course regions.

• Steep-sided valleys and vertical drops, because fast-flowing rivers cut through rock and create these features.

• Wide river deltas and marshes, because rivers slow down and deposit sediment.

• Coral reefs and atolls, because they form in upper course river regions.

What is the main process that leads to the formation of meanders in a river's middle course?

• Water flows faster on the inner bend, eroding the bank and creating a straight path.

• Water flows faster on the outer bend, eroding the bank, while slower inner flow deposits sediment, creating a curved path.

• Water flows at the same speed on both bends, causing no change in the river path.

• Water only deposits sediment on the outer bend, making the river wider.

What causes the river to cut a new, straighter channel during the formation of an oxbow lake?

• A flood event

• A drought

• Earthquake activity

• Human intervention

Why does the old meander bend become separated from the main river to form an oxbow lake?

• Sediment seals off the old meander bend

• The river dries up completely

• The river freezes over

• Animals build a dam

Kanwar Lake in Bihar is an example of which type of lake?

• Oxbow lake

• Crater lake

• Glacial lake

• Artificial lake

How are floodplains formed in the lower course of a river?

• When rivers overflow their banks during floods, depositing nutrient-rich silt across the valley floor

• When rivers erode mountains and create deep valleys

• When glaciers melt and carve out new river channels

• When wind blows sand into large dunes along the riverbanks

Which of the following best describes the characteristics of floodplains?

• Extremely flat and fertile land with layered alluvial soil, often supporting intensive agriculture

• Rocky and steep land with little vegetation

• Dry and sandy land with sparse plant life

• Hilly terrain with many waterfalls

Which region is given as an example of a floodplain in the learning material?

• The Sahara Desert

• The Indo-Gangetic Plain

• The Amazon Rainforest

• The Rocky Mountains