C. Fill in the Blanks
1. The instrument used to measure the intensity of an earthquake is called the __________.
2. The land surface directly above the focus is called the __________.
3. A volcano that is unlikely to erupt ever again is called __________.
4. A huge sea‑wave formed by an under‑sea disturbance is called a __________.
5. Raised embankments built to prevent floods are called __________.
6. Flood water often causes diseases like __________ and cholera.
7. Excessive cutting of __________ reduces rainfall and causes drought.
8. One method to avoid drought is __________ (planting trees).
9. Organizations like the __________ Society give medical relief during calamities.
10. The government promotes __________ systems to alert people about calamities early.
D. Short Answer Questions (2–3 sentences).
1. Explain why tectonic plates cause earthquakes.
2. Describe the difference between active, dormant and extinct volcanoes.
3. How can planting trees along river banks help control floods?
4. What role do NGOs like WHO and UNICEF play during natural calamities?
5. Why is rainwater harvesting useful during times of drought?
E. Long Answer Questions (about a short paragraph each).
1. Describe the causes and effects of earthquakes, and explain one major earthquake example (e.g. Bhuj 2001 or Turkey‑Syria 2023).
2. Explain how tsunamis form and discuss their impact on coastal regions.
3. Discuss three key methods to control floods and how each helps reduce damage.
4. Analyse the causes of drought in states like Rajasthan and Gujarat, and how afforestation can mitigate it.
5. Discuss the importance of preparedness and describe measures to deal with natural calamities, including the roles of government and NGOs.
Class 5 Science Natural Calamities Worksheet – Answer Key
A. Multiple Choice Questions
1. B) Focus
2. C) Intensity
3. C) Active
4. B) Under‑sea earthquake
5. C) Typhoon
6. B) Alluvial soil
7. A) Afforestation
8. B) Rainwater harvesting
9. A) Less rainfall
10. C) UNICEF
B. True / False
1. False (Epicentre is directly above the focus on surface)
2. False (3 Richter scale is minor, causes little damage)
3. True
4. True
5. True
6. False (Dam failure can cause severe floods)
7. False (Drought occurs due to lack of rainfall)
8. True
9. True
10. False (NGOs provide relief for all disasters)
C. Fill in the Blanks
1. Seismograph
2. Epicentre
3. Extinct
4. Tsunami
5. Levees or Bunds
6. Dysentery
7. Trees or Forests
8. Afforestation
9. Red Cross
10. Early warning
D. Short Answer Questions
1. Tectonic plates move and grind against each other causing vibrations in the earth’s crust known as earthquakes.
2. Active volcanoes erupt regularly; dormant have not erupted recently but may; extinct will not erupt again.
3. Trees reduce soil erosion and slow down water flow, helping prevent floods.
4. NGOs provide emergency relief, medical aid, food, and shelter during disasters.
5. Rainwater harvesting collects and stores rainwater, increasing water availability during drought.
E. Long Answer Questions
1. Earthquakes occur due to sudden movement along faults. Effects include ground shaking, damage to buildings, loss of life. Example: 2001 Bhuj earthquake caused massive destruction in Gujarat.
2. Tsunamis form due to underwater earthquakes or volcanic eruptions causing large waves that flood coastal areas, damaging lives and property.
3. Flood control methods: afforestation (reduces runoff), levees/bunds (prevent overflow), and check-dams (slow water flow).
4. Causes of drought: low rainfall, deforestation, high temperatures. Afforestation helps by improving rainfall and reducing soil erosion.
5. Preparedness includes early warning systems, building cyclone shelters, educating people, and NGOs/government coordinating relief and rehabilitation.
