Class 8 Exam > Class 8 Notes > NCERT Solutions - Earthquakes, Disaster Management, Class 8
Earthquakes, Disaster Management, Class 8 NCERT Solutions PDF Download
NCERT TEXTBOOK QUESTIONS SOLVED
Earthquakes
Q.1. What is a seismograph? Where is it usually kept in your city? If you live in a village, can you find out where the nearest seismograph is kept?
Ans. Aseismo graph is aninstrument that records waves caused during an earthquake. It is usually kept at geological centres.
Q.2. How would you prevent bleeding from a wound on the arm?
Ans. To prevent bleeding from a wound, one should apply pressure with cotton and bandage.
Q.3. What precautions should one take when one enters a building that has cracked or collapsed because of an earthquake?
Ans. When one enters a building collapsed after an earthquake, one should keep away from walls, beware of aftershocks and save survivors quickly.
Q.8. Are there Ham Radio Operators in your village or area? Find out more about Ham Radio.
Ans. Amateur radio, often called ham radio, is both a hobby and a service in which participants, called “hams,” use various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self-training. Amateur radio operators enjoy personal (and often worldwide) wireless communications with each other and are able to support their communities with emergency and disaster communications if necessary, while increasing their personal knowledge of electronics and radio theory. An estimated six million people throughout the world are regularly involved with amateur radio.
FAQs on Earthquakes, Disaster Management, Class 8 NCERT Solutions
| 1. What is an earthquake and how does it occur? |  |
Ans. An earthquake is a sudden shaking or trembling of the Earth's surface caused by the movement of tectonic plates beneath the Earth's crust. The Earth's crust is made up of several large and small plates that are constantly moving. When these plates collide, slide past each other, or separate, it generates a release of energy in the form of seismic waves, resulting in an earthquake.
| 2. What are the primary effects of an earthquake? | |
Ans. The primary effects of an earthquake include ground shaking, surface rupture, and the formation of fissures and cracks in the Earth's surface. These can lead to the collapse of buildings, infrastructure damage, landslides, and tsunamis in coastal areas. The intensity of the shaking and the resulting damage depends on factors such as the magnitude of the earthquake, the distance from the epicenter, and the local geology.
| 3. How can we measure the intensity of an earthquake? | |
Ans. The intensity of an earthquake is measured using a seismograph, which records the seismic waves produced by the earthquake. The most commonly used scale for measuring earthquake intensity is the Richter scale. The Richter scale assigns a numerical value to the magnitude of the earthquake, which represents the amount of energy released. The higher the magnitude, the more severe the earthquake.
| 4. How can we stay safe during an earthquake? | |
Ans. To stay safe during an earthquake, it is important to follow certain precautions. These include finding a safe place indoors away from windows, heavy furniture, and objects that may fall, such as bookshelves or hanging fixtures. It is recommended to "Drop, Cover, and Hold On" during the shaking. This means dropping to the ground, taking cover under a sturdy piece of furniture, and holding on until the shaking stops. It is also important to have an emergency plan in place, know the location of emergency exits, and be aware of evacuation routes.
| 5. How can disaster management help in minimizing the impact of earthquakes? | |
Ans. Disaster management plays a crucial role in minimizing the impact of earthquakes. It involves various measures such as preparedness, response, recovery, and mitigation. By conducting earthquake drills and creating awareness among the public, disaster management helps in preparing individuals and communities to respond effectively during an earthquake. It also focuses on developing and implementing building codes and regulations that ensure the construction of earthquake-resistant structures. Additionally, disaster management involves post-earthquake activities like providing immediate relief, reconstruction, and rehabilitation to affected areas, thus reducing the long-term impact of earthquakes.
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