Unit 5 - Practice Quiz

A flood is characterized by an excess of water that submerges land that is usually dry. The other options describe drought, earthquake, and forest fire respectively.

A seismograph is the scientific instrument used to detect and record earthquakes. A barometer measures air pressure, a thermometer measures temperature, and an anemometer measures wind speed.

An industrial chemical spill is caused by human activity or error, making it a man-made disaster. The other options are natural disasters caused by geological or meteorological phenomena.

NDRF stands for National Disaster Response Force. It is a specialized force constituted for the purpose of special response to a threatening disaster situation or disaster.

Cyclones are rotating storm systems characterized by a low-pressure center. Air spirals inward towards this center, creating strong winds and rain.

A drought is a natural disaster characterized by a lack of precipitation over an extended period, resulting in a water shortage.

Molten rock is called magma when it is beneath the Earth's surface. When it erupts from a volcano, it is called lava.

A train derailment is a disaster related to a mode of transportation. The other options are structural, technical, or natural/man-made environmental disasters.

The media plays a crucial role in disaster management by spreading awareness, issuing warnings, and providing updates to the public, which helps in reducing panic and facilitating response.

A landslide is the movement of rock and soil down a slope. An avalanche specifically refers to the rapid flow of snow down a slope.

A pandemic is a type of biological disaster defined as an epidemic of an infectious disease that has spread across a very large region, such as multiple continents or worldwide.

The Prime Minister of India is the ex-officio chairperson of the National Disaster Management Authority (NDMA), which is the apex body for disaster management in the country.

An avalanche is specifically defined as a mass of snow, ice, and rocks falling rapidly down a mountainside. A landslide involves soil and rock but not typically snow and ice.

The main and most severe hazard from a nuclear disaster, such as a meltdown at a power plant, is the release of radioactive materials into the environment, which can cause long-term health effects.

NGO stands for Non-Governmental Organization. These are non-profit, voluntary citizens' groups that play a vital role in disaster relief, rehabilitation, and preparedness.

Tropical cyclones are known by different names in different parts of the world. They are called hurricanes in the Atlantic/Northeast Pacific, typhoons in the Northwest Pacific, and cyclones in the South Pacific and Indian Ocean.

The disaster management cycle typically begins with Mitigation, which involves taking steps to reduce or eliminate the impact of a disaster before it occurs. This is followed by preparedness, response, and recovery.

The Bhopal Gas Tragedy was a catastrophic industrial accident involving the leak of toxic methyl isocyanate (MIC) gas, making it a prime example of a chemical disaster.

Mock drills are exercises that simulate a disaster scenario to test response plans and train personnel. They are a key component of the disaster preparedness phase, which happens before a disaster strikes.

The local government and community are the first responders in any disaster situation. They are on the ground and can provide immediate help before state or national agencies can mobilize and arrive.

Base isolation and damper systems are engineering techniques designed to decouple a structure from the ground's shaking motion, absorbing and dissipating seismic energy. Unreinforced masonry is extremely brittle and performs poorly in earthquakes. Increasing building height without proper engineering can be more dangerous. While open spaces are crucial for post-disaster evacuation, preventing building collapse in the first place is the most effective way to reduce casualties.

Structural approaches involve physical constructions like levees, dams, and channel modifications. A non-structural approach, such as land-use zoning, aims to reduce risk by keeping people and property away from the hazard zone, rather than trying to control the hazard itself.

Chlorine gas is about 2.5 times denser than air, meaning it will accumulate in low-lying areas. Therefore, seeking higher ground is the correct immediate action. Going to the basement would be extremely dangerous. Sealing doors and windows prevents the gas from entering the sheltered space.

The NDMA is the apex body for Disaster Management in India. Its primary mandate is proactive, focusing on policy-making, prevention, mitigation, and preparedness. While it coordinates response, the actual ground operations are carried out by specific forces (like NDRF) and state/district authorities. NDMA's key role is to create the framework within which these agencies operate.

A storm surge is an abnormal rise in sea level generated by a storm, over and above the predicted astronomical tides. This massive volume of water, pushed by powerful winds, can cause widespread coastal inundation, leading to immense destruction and a high number of fatalities, often more than the wind itself.

Local NGOs often possess 'last-mile connectivity.' Their staff and volunteers are from the community, giving them invaluable local knowledge, existing relationships, and a level of trust that allows them to mobilize and deliver aid more quickly and effectively in the critical initial hours before larger, formal aid arrives.

While the cause is a meteorological drought (lack of rainfall), the described impact—depleted surface water (reservoirs) and groundwater—is the definition of a hydrological drought. Agricultural drought refers specifically to a lack of soil moisture for crops, and socio-economic drought refers to when water scarcity starts affecting people's health, well-being, and economic activity.

The thyroid gland naturally absorbs iodine to function. In a nuclear accident, radioactive iodine (I-131) can be released. If inhaled or ingested, the thyroid will absorb it, increasing the risk of thyroid cancer. Taking stable (non-radioactive) potassium iodide (KI) saturates the thyroid, preventing it from taking up the radioactive version. It is specific to iodine and does not protect against other radioactive elements.

Slopes are stable due to a balance of forces. The material at the bottom (the 'toe') of a slope provides crucial support for the material above it. Excavating or cutting into the toe removes this support, over-steepening the slope and making it much more susceptible to failure under its own weight or when triggered by rainfall or an earthquake.

This is a key distinction in managing biological disasters. Isolation separates sick people with a contagious disease from people who are not sick. Quarantine separates and restricts the movement of people who were exposed to a contagious disease to see if they become sick. It is a precautionary measure for those who are not yet confirmed to be ill.

The most crucial role of the media during a disaster is to be a reliable conduit of information from official sources to the public. Spreading rumors and unverified information, even with good intentions, can create 'infodemics' that cause panic, lead to wrong actions (like evacuating in the wrong direction), and undermine the credibility of official rescue agencies. Accuracy and verification are paramount.

A lahar is a destructive mudflow or debris flow made up of a slurry of pyroclastic material, rocky debris, and water. The loose volcanic ash and debris deposited on the volcano's slopes during the eruption can be easily remobilized by heavy rainfall, creating fast-moving, concrete-like flows that can travel for many kilometers and bury entire towns long after the eruption is over.

The 'Golden Hour' refers to the first hour after a traumatic injury. It is widely believed that a victim's chances of survival are greatest if they receive definitive medical care within this period. This principle guides the entire emergency response system, emphasizing rapid assessment, stabilization, and transport to a suitable medical facility.

CBOs excel at leveraging local knowledge and mobilizing the community. Creating risk maps (Participatory Rural Appraisal), planning routes, and conducting drills are low-cost, high-impact activities that build community resilience and capacity. Large engineering projects and advanced equipment are typically beyond the scope and expertise of a CBO and are the responsibility of government agencies.

This is a key concept in seismology. Magnitude (like Richter or Moment Magnitude) is a single, objective value that quantifies the total energy released by an earthquake at its hypocenter. Intensity (like MMI) is a subjective measure that describes the effects of the shaking at a particular place, based on observed damage and human reactions. An earthquake has only one magnitude but can have many different intensity values at different locations.

The Disaster Management Act, 2005, mandates a hierarchical structure. The DDMA, headed by the District Collector/Magistrate, is the primary body for planning, coordinating, and implementing disaster management at the district level. The SDMA and NDMA step in when the scale of the disaster exceeds the capacity of the district and state, respectively. The NDRF is a specialized response force, not a coordinating authority.

The key difference is in the predictability based on observable phenomena. Cyclones (hurricanes/typhoons) are large atmospheric systems that can be tracked from their formation over the ocean, allowing for several days of warning. Earthquakes result from a sudden release of stress along faults deep underground, and currently, there are no scientifically proven methods to predict their exact time, place, and magnitude with any degree of accuracy.

Slab avalanches are the most dangerous type. They occur when a cohesive layer of snow (the slab) sits on top of a weaker layer. The combination of a steep slope (30-45° is the prime angle), a weak underlying layer (like an icy crust or hoarfrost), and a new load (heavy snow) creates the perfect instability for the entire slab to fracture and slide at once.

An outbreak is a sudden increase in cases in a specific location. An epidemic is when a disease spreads rapidly among a large number of people in a given population or region. A pandemic is an epidemic that has spread over several countries or continents, affecting a large number of people worldwide. The global spread is the defining characteristic of a pandemic.

This is an example of ecosystem-based disaster risk reduction. Mangroves and wetlands act as natural buffers; they can absorb and dissipate the energy of storm surges and slow down floodwaters, thereby reducing the impact of the hazard. This is a mitigation measure because it aims to lessen the severity of the disaster's effects on the city.

P-waves travel faster than S-waves. The further an observer is from the epicenter, the greater the time difference between the arrival of the non-destructive P-wave and the destructive S-wave. The EEW system uses this from the first few seismic stations to rapidly estimate the distance to the epicenter and predict the arrival time of the S-waves at other locations, not the final magnitude or depth, which take longer to calculate.

While the NDMA, chaired by the Prime Minister, is the apex body for laying down policies, plans, and guidelines, the NEC is the executive arm responsible for implementation. Its core function is to coordinate and monitor the execution of the NDMA's directives and the National Plan across various ministries and agencies, making it the key operational body.

The key is the behavior of the gas. The initial cloud is dense and ground-hugging due to its low temperature and moisture absorption. Therefore, seeking high ground (Option C) or staying put (Option B) could be fatal as the cloud moves. Going into a basement (Option A) is the worst action as the dense gas would displace air there. The standard and safest procedure for any moving toxic cloud is to evacuate by moving crosswind (perpendicular to the wind direction) to get out of its path as quickly as possible.

A cyclone's winds rotate counter-clockwise in the Northern Hemisphere. In the right-front quadrant (relative to its direction of motion), the wind direction aligns with the storm's forward movement. This adds the storm's own speed to its rotational wind speed, resulting in the highest net wind velocities and the most powerful storm surge. The left-front quadrant experiences a subtractive effect.

Syndromic surveillance focuses on monitoring non-specific health indicators, such as clusters of symptoms (e.g., fever, respiratory distress) reported in emergency rooms or pharmacy sales of specific medications. Its main advantage is speed. It can flag a potential outbreak hours or days before laboratory tests can confirm the specific pathogen, which is critical for a rapid public health response in a bioterrorism scenario.

The earthquake will severely destabilize slopes and trigger numerous landslides. Many of these landslides can block rivers, forming 'landslide dams'. These dams are unstable and can fail catastrophically during the heavy rainfall of the next monsoon season, releasing a massive volume of water and debris downstream. This is a latent (hidden or delayed) threat that requires monitoring and planning far beyond the immediate earthquake response phase, unlike aftershocks or liquefaction which are immediate secondary effects.

The progression typically starts with a deficit in precipitation (Meteorological Drought). This quickly impacts soil moisture, affecting crops (Agricultural Drought). Prolonged meteorological drought leads to reduced streamflow and depleted reservoirs/groundwater (Hydrological Drought). Finally, the combined effects of crop failure, water scarcity, and reduced industrial output lead to widespread Socio-economic Drought.

There is a clear demarcation. The IMD's mandate is meteorological; it forecasts the cause (heavy rainfall, cyclones). The CWC's mandate is hydrological; it uses IMD's rainfall data, along with river flow data, to model and forecast the effect (rise in river water levels and subsequent inundation). CWC is the nodal agency for riverine flood forecasting in India.

The INES scale is logarithmic. Level 1 (Anomaly) is a deviation from normal operation. Level 2 (Incident) involves significant failures in safety provisions or an event leading to worker doses exceeding annual limits, with significant on-site contamination. Level 3 (Serious Incident) involves a near-accident scenario or severe contamination/acute health effects in workers. Level 4 involves a minor off-site release. The described scenario, with a significant safety failure but contained on-site impact and no overexposure, fits the criteria for a Level 2 Incident.

The core failure at Bhopal, from a modern preparedness perspective, was the lack of robust, tested, and legally mandated emergency plans for both inside the factory (On-Site) and the surrounding community (Off-Site). The DM Act, 2005, and associated rules heavily emphasize this aspect of mitigation and preparedness, requiring industries to create and share these plans with district authorities. This was glaringly absent in 1984, leading to a complete breakdown in community warning and response.

This highlights a critical difference in risk management. A PDC is a primary eruptive hazard; the warning is the eruption itself. However, lahars are a secondary hazard. Thick volcanic ash deposited on slopes can be remobilized by heavy rain months or even years later, creating a sudden and deadly mudflow with no new volcanic activity to act as a warning. This makes long-term monitoring and risk communication for lahars exceptionally challenging.

In the critical first hours before external help can arrive, the CBO's strength lies in its 'social capital'. They have an intimate knowledge of the community: who is most vulnerable, what local resources (people, tools, safe spaces) are available, and trusted communication channels. This allows for a much faster initial response and more accurate damage assessment than external agencies can achieve initially.

While GLOFs are rapid (unlike option C), can occur in summer, and can be triggered by various factors (not just earthquakes), their most unique characteristic is the immense volume of water, debris, and sediment released from the breach of a moraine dam. This hyperconcentrated flow has incredible erosive power, capable of completely changing the river's path, destroying infrastructure far downstream, and making pre-defined flood hazard zones unreliable.

Unified Command is a cornerstone of the Incident Command System (ICS). It is designed for multi-jurisdictional or multi-agency incidents. Instead of a single Incident Commander, it allows the leaders of the key responding agencies (e.g., police for security, fire for hazmat/suppression, EMS for medical) to co-locate and jointly determine overall objectives, strategies, and resource allocation, ensuring a coordinated, non-conflicting response.

While reporting is essential, the media's most vital function during the response phase is as a public information conduit. Providing accurate, life-saving information (e.g., 'boil water before drinking,' 'this bridge is out,' 'shelter is available at X location') can have a direct impact on the well-being of the affected population. A key part of this responsibility is to verify information before broadcasting and to actively debunk rumors and misinformation that can cause panic or harm.

Conventional radar shows precipitation intensity and location (reflectivity). Doppler radar, by using the Doppler effect, can also measure the velocity of targets (raindrops, ice particles) moving relative to the radar. This provides a detailed picture of the wind field inside the storm, allowing meteorologists to detect rotation, identify features like mesovortices, and better estimate the cyclone's intensity and potential for tornadoes, which is crucial for specific warnings.

Unlike floods or earthquakes that require immediate, large-scale search and rescue under the Ministry of Home Affairs, drought is a slow-onset disaster. The response is not about physical rescue but about mitigating its impact on agriculture and livelihoods. Therefore, the primary responsibility is with the Ministry of Agriculture, and the strategy emphasizes proactive measures like contingency crop planning, water conservation, employment generation schemes (like MGNREGA), and financial relief, rather than reactive emergency response.

A 'dry-slab avalanche' is the most dangerous type. It requires a specific recipe: 1) a weak, persistent basal layer of snow (like sugary, non-cohesive depth hoar) that acts as a failure plane. 2) A thick, cohesive slab of new snow on top that can propagate a fracture. 3) A slope angle steep enough to slide (30-45 degrees is prime). 4) A trigger, which can be a skier or, in this case, the added weight and stress from wind-deposited snow (wind loading). This combination creates a high-stakes situation where a huge area of the snowpack can slide at once.

The greatest challenge is the initial ambiguity. An outbreak of a disease like anthrax or plague could be natural or deliberate. The clinical symptoms in patients are the same. Authorities must act as detectives, analyzing the pattern of the outbreak. Clues pointing to a deliberate act include: a point-source outbreak in an area where the disease is not endemic (unusual geography), affecting a group of previously healthy adults with no common travel history (atypical demographics), or the presence of a strain with unusual antibiotic resistance.

This is a classic seismological proof. S-waves (shear waves) are a type of mechanical wave that can only propagate through solid materials; they cannot travel through liquids or gases. The fact that a 'shadow zone' exists from 104° to 180° from the epicenter, where no direct S-waves are received, demonstrates that there is a liquid layer deep within the Earth that is blocking their path. This layer is the outer core.