The study of Natural Hazards in Environmental Geosciences focuses on understanding the causes, impacts, and distribution of these events, as well as strategies for risk assessment and disaster mitigation. A sound understanding of natural hazard processes is essential for building environmental resilience and managing disaster risks, key areas in UGC-NET/JRF, SLET, ARS, GATE, and other competitive examinations.
Use this curated MCQ bank to test your conceptual understanding, identify weak areas, and sharpen your exam readiness.
Syllabus outline
- Definition and classification of natural hazards (e.g. earthquakes, volcanoes, landslides, floods, hurricanes, tsunamis).
- Historical examples and impacts of major natural disasters.
- Tectonic plate movements and faulting processes.
- Seismic waves, magnitude, and intensity scales.
- Earthquake monitoring and early warning systems.
- Volcanic processes and types of eruptions.
- Volcanic hazards (e.g. lava flows, pyroclastic flows, ashfall, and volcanic gases).
- Volcano monitoring and risk assessment.
- Types of landslides and their triggers (e.g. heavy rainfall, seismic activity).
- Landslide risk assessment and mitigation strategies.
- Causes of floods and flood forecasting.
- Floodplain mapping and flood risk management.
- Formation and characteristics of tropical cyclones and hurricanes.
- Storm surge, wind damage, and coastal impacts.
- Causes of tsunamis and their propagation.
- Coastal hazard assessment and early warning systems.
- Study of climate-related hazards, such as droughts, heatwaves, and extreme weather events.
- Impact of climate change on natural hazards.
- Techniques for assessing the vulnerability and risk of natural hazards.
- Strategies for mitigating the impacts of natural disasters.
Quick Study Guide
Quantitative analysis of natural hazards evaluates the mechanical, thermodynamic, and fluid dynamic principles governing catastrophic lithospheric, geomorphological, and atmospheric events.
- Seismic Mechanics and Lithospheric Rupture: Earthquakes release accumulated tectonic strain energy along faults via the elastic rebound theory. The rupture originates at the subsurface focus (hypocenter) and propagates to the surface epicentre. Magnitude is calculated via the Moment Magnitude Scale using fault slip area and rock rigidity, whereas shaking intensity is qualitatively assessed. Severe ground shaking in water-saturated, unconsolidated sediments triggers liquefaction, neutralising shear strength and turning soil into a fluid-like mass.
- Volcanic Hazards and Magmatic Rheology: Eruptive styles are dictated by magmatic viscosity and volatile gas fractions. High-silica felsic magmas trap volatiles, causing explosive eruptions that produce pyroclastic flows (high-velocity density currents of superheated gas and rock fragments) and lahars (volcanic mudflows). Low-silica mafic magmas yield effusive, low-viscosity lava flows. Eruptive intensity is quantified logarithmically on the Volcanic Explosivity Index.
- Mass Wasting and Slope Dynamics: Downslope mass movement under gravity is evaluated using the Factor of Safety, the ratio of resisting shear strength (friction and cohesion) to driving shear stress. Elevated pore water pressure from intense rainfall reduces frictional resistance between mineral grains and increases slope mass, decreasing the Factor of Safety to trigger landslides, slumps, or debris flows.
- Fluvial Flooding and Catchment Hydrographs: Fluvial flooding occurs when channel discharge exceeds bankfull capacity. Hydrographic responses track lag time—the interval between peak precipitation and peak runoff. Decreased soil infiltration capacity accelerates overland flow, which shortens lag time and elevates peak discharge to cause flash floods.
- Tsunami Kinematics and Coastal Shoaling: Tsunamis are long-period, high-velocity waves generated by vertical seafloor displacement during subduction earthquakes. In deep water, they possess immense wavelengths and low amplitudes. Upon entering shallow coastal waters, they undergo shoaling: seafloor friction decreases wave velocity, compressing the wavelength and drastically elevating wave height before coastal impact.
Test Your Knowledge
This quiz contains 25 concept-based MCQs on “Environmental Geosciences – Natural Hazards“. Each question has a single correct/most appropriate answer.
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1. Which is not an ideal solution for tackling water shortages?
a) Controlling water pollution
b) Controlling population growth
c) Conserving water in irrigation
d) Drilling a large number of deep-bore wells
2. Which is an example of a climatological disaster?
a) Landslide
b) Tsunami
c) Drought
d) Earthquake
3. Among which of the following Hazards and Disasters are classified?
a) Chemical and Physical
b) Natural and Synthetic
c) Natural and Anthropogenic
d) Cultural and Social
4. Which of the following is NOT always a natural disaster?
a) Volcano
b) Earthquake
c) Tropical cyclones
d) Floods
5. Mock drills are an important part of disaster mitigation because:
a) They are an integral part of corporate social responsibility (CSR).
b) They are mandatory requirements of the environmental management system of an organisation.
c) They help improve response preparedness and identify the scopes of improvement in the disaster management plan.
d) Pollution control boards mandate it, and industries are obligated to comply.
6. Which flood is characterised by unplanned development and improper solid waste management practices?
a) Arial/Meteorological
b) Flash
c) Urban
d) Coastal
7. Which of the following can reduce evaporation and increase infiltration?
a) Contour trenches
b) Crop Rotation and intercropping
c) Siltation
d) Mulching
8. What is the first step towards planning an efficient disaster mitigation plan?
a) Risk Assessment
b) Emergency Response
c) Hazard Identification
d) Rescue and Relief operations
9. Volcanoes are generally found where
a) Tectonic plates pull apart or come together
b) Island pulls apart or is coming together
c) Earth’s crust pulls apart or is coming together
d) Intraplate pull apart or are coming together
10. Which condition is not directly linked with drought conditions?
a) Not having adequate soil cover
b) Not having enough topsoil and a hardpan
c) Slow runoff and increased infiltration into the soil
d) Less rainfall than normal and poor distribution of rainfall
11. Which is not an example of a rapid-onset disaster?
a) Cyclone
b) Drought
c) Earthquake
d) Tsunami
12. The expected losses due to any unexpected event can be termed as:
a) Vulnerability
b) Accident
c) Risk
d) Disaster
13. IWRM addresses the “three E’s”:
a) Ecosystem Management, Environmental Impact and Social Equity
b) Evaluation of Resources, Economic efficiency, Environmental sustainability
c) Economic efficiency, Environmental impact assessment and Social Equity
d) Economic efficiency, Environmental Sustainability and Social Equity
14. Which is not necessarily a mandatory requirement for forest fires?
a) Source of ignition
b) Fuel
c) Air (oxygen)
d) Human interference
15. Which of the following natural resources is productive?
a) Uranium
b) Fossil Fuel
c) Soil
d) Coal
16. If the wind speed is increased by double, then the energy will increase by about
a) 414x
b) 4x
c) 2x
d) 8x
17. In which direction did tropical cyclones blow in the northern hemisphere?
a) Clockwise direction
b) Anticlockwise direction
c) Straight forward
d) In any direction
18. To increase the rotational speed, a low-speed shaft needs to be connected with a high-speed shaft with the help of:
a) Generator
b) Gearbox
c) Nacelle
d) Powered rotor
19. Which rainwater harvesting method can be adopted by individual house owners?
a) Creation of new water bodies
b) Construction of recharge trenches
c) On-channel storage of water
d) Roof-top rainwater harvesting
20. The tropical cyclones are not likely to occur near the equator because of negligible:
a) Coriolis force
b) Depression force
c) Centripetal force
d) Centrifugal force
21. Tropical cyclones spin in different directions based on their:
a) Both Velocity and Energy
b) Velocity
c) Energy
d) Location (northern/southern)
22. Which of the following statements is false about sustainable forest management?
a) Most of the northern countries have large capacities in terms of financial and human resources to manage forests.
b) Most southern countries have socio-economic equity with low financial and human resources to manage forests.
c) Forests of northern countries are less complex, often smaller, fragmented and have lower biodiversity.
d) Forests of southern countries are extended and complex forests with high biodiversity.
23. Which of the following is correct about the Coriolis force?
a) If it were not for the Earth’s rotation, global winds would blow in straight north-south lines.
b) The Coriolis force affects only the large-scale movement of air in the atmosphere.
c) The Coriolis effect is caused by the rotation of the Earth and the pressure difference between 2 points.
d) Winds are deflected to the right in the Southern hemisphere.
24. Which disaster is because of an earthquake beneath the oceanic crust?
a) Tsunami
b) Drought
c) Forest fire
d) Cyclone
25. The point on the earth’s surface above the hypocentre of the earthquake is called:
a) Focus
b) Hypercentre
c) Epicentre
d) Endocentre
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References
- Edward A. Keller (2022). Introduction to Environmental Geology, Pearson, 5th Edition.
- Sharma, P. D. (2017). Environmental Biology and Toxicology, Rastogi Publications, 3rd Edition.
- De, Anil Kumar and De, Arnab Kumar (2024). Environmental Chemistry, New Age International, 11th Edition.
- Odum, Eugene P., and Barrett, Gary W. (2004). Fundamentals of Ecology, Thomson Brooks/Cole, 5th Edition.
- Singh, J.S., Gupta, S.R., Singh, S.P. & Singh, R. (2026). Ecology, Environmental Science and Conservation, S Chand Publishing, 2nd Edition.
- Erach Bharucha (2017). Environmental Studies, Universities Press, 4th Edition.
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