Class 9 Exam > Class 9 Notes > Social Studies (SST) Class 9 > Unit Test: Drainage
Unit Test: Drainage | Social Studies (SST) Class 9 PDF Download
Time: 1 hour
M.M. 30
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each.
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question numbers 12 & 13 carry 5 marks each.
Q1. Which of the following is the largest drainage basin in the world? (1 Mark)
(a) Ganga
(b) Amazon
(c) Indus
(d) Brahmaputra
Q2. Which river is known as the ‘Dakshin Ganga’ ? (1 Mark)
(a) Krishna
(b) Godavari
(c) Kaveri
(d) Mahanadi
Q3. Which lake is the largest freshwater lake in India? (1 Mark)
(a) Dal
(b) Wular
(c) Chilika
(d) Sambhar
Q4. Which Peninsular river flows through a rift valley? (1 Mark)
(a) Mahanadi
(b) Narmada
(c) Godavari
(d) Krishna
Q5. What is the name of the world’s largest riverine island formed by the Brahmaputra? (1 Mark)
(a) Majuli
(b) Sundarban
(c) Loktak
(d) Dhuadhar
Q6. What is a water divide? Give an example. (2 Marks)
Q7. Why does the Brahmaputra carry less silt in Tibet compared to India? (2 Marks)
Q8. State two economic benefits of rivers. (2 Marks)
Q9. Describe the key features of the Indus River System. (3 Marks)
Q10. Compare the Himalayan and Peninsular rivers in terms of their flow and origin. (3 Marks)
Q11. Explain the formation of the Sundarban Delta. (3 Marks)
Q12. Discuss the characteristics and significance of the Godavari Basin. (5 Marks)
Q13. Analyze the role of lakes in India’s economy and tourism. (5 Marks)
The document Unit Test: Drainage | Social Studies (SST) Class 9 is a part of the Class 9 Course Social Studies (SST) Class 9.
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FAQs on Unit Test: Drainage - Social Studies (SST) Class 9
| 1. What is the importance of drainage in agricultural practices? |  |
Ans. Drainage plays a crucial role in agriculture as it helps in removing excess water from the soil. This is important because waterlogged fields can lead to root rot, reduced oxygen availability for plants, and hindered growth. Proper drainage systems enhance soil aeration, promote healthy root development, and improve crop yields by ensuring that plants receive the right amount of water.
| 2. What are the different types of drainage systems used in agriculture? | |
Ans. There are several types of drainage systems used in agriculture, including surface drainage, subsurface drainage, and controlled drainage. Surface drainage involves the removal of excess water from the land surface through ditches or channels. Subsurface drainage uses pipes installed below the soil surface to remove excess water. Controlled drainage allows farmers to manage water levels in the soil, maintaining optimal moisture conditions for crops.
| 3. How does poor drainage affect crop production? | |
Ans. Poor drainage can severely affect crop production by leading to waterlogged soils, which can result in anaerobic conditions that suffocate plant roots. This can cause stunted growth, lower yields, and increased susceptibility to diseases. Additionally, it can lead to nutrient leaching, where essential nutrients are washed away from the root zone, further degrading soil fertility.
| 4. What factors should be considered when designing a drainage system? | |
Ans. When designing a drainage system, several factors must be considered, including soil type, topography, climate, and the specific crops being grown. Soil types with different drainage characteristics will require tailored approaches. The slope of the land affects water flow, while climate determines the amount of rainfall and evaporation rates. Additionally, the drainage system should be designed to prevent erosion and maintain soil health.
| 5. What are the environmental impacts of drainage systems? | |
Ans. While drainage systems are essential for agricultural productivity, they can have environmental impacts, such as altering natural water flow patterns and affecting local ecosystems. For example, excessive drainage can lead to reduced wetland areas, impacting biodiversity. Additionally, if not managed properly, drainage can contribute to water quality issues, such as increased sediment and nutrient runoff into nearby water bodies.
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