Question Answers For All Chapters – General Science Class 7
Disaster Management-Solutions
Exercise
1. Find the odd one out.
(a) Famine, earthquake, cloudburst, railway accident.
→ Railway accident (It is a man-made disaster, others are natural).
(b) Drought, heavy rains, storm, tsunami.
→ Drought (Others involve water, drought is due to lack of water).
(c) Lava, hot mud, ash, locusts.
→ Locusts (Others are related to volcanic eruptions, locusts are insects).
(d) Washing away of crops, attack of pests on crops, volcano, singeing of crops.
→ Volcano (Others are related to agriculture, volcano is a geological event).
2. What are the remedial measures for the following calamities?
(a) Famine
- Store food and water properly.
- Practice water conservation and plant more trees.
(b) Lightning strike
- Stay indoors, avoid trees and open fields during a thunderstorm.
- Do not use electrical appliances or metal objects.
(c) Storm
- Stay in a safe shelter and avoid outdoor activities.
- Listen to weather updates and follow government warnings.
(d) Cloudburst
- Avoid low-lying areas and move to higher ground.
- Strengthen drainage systems to prevent flooding.
3. True or False? Give reasons for your answer.
(a) Information about a forthcoming storm is to be kept secret.
→ False – People must be informed to take safety measures.
(b) You should not swim when there is lightning in the sky.
→ True – Water conducts electricity, so swimming can be dangerous.
(c) It is possible to prevent the eruption of a volcano.
→ False – Volcanoes are natural events and cannot be stopped.
(d) Heavy rains result in famine.
→ False – Heavy rains can cause floods, but famine occurs due to drought and food shortage.
4. Write answers to the following questions in your own words.
(a) What is a tsunami? What gives rise to a tsunami?
→ A tsunami is a huge ocean wave caused by an underwater earthquake, volcanic eruption, or landslide.
(b) What is a cloudburst?
→ A cloudburst is sudden and very heavy rainfall in a small area, caused by rapid condensation of water vapor in clouds.
(c) Explain the effects of a volcano.
- Lava, hot gases, and ash destroy forests and buildings.
- Air pollution increases, and new landforms like mountains can be created.
(d) What are the measures to prevent loss of life due to lightning?
- Avoid open fields, trees, and water bodies during a thunderstorm.
- Stay indoors and do not use mobile phones or electrical appliances.
5. What measures have been taken to deal with calamities such as floods and landslides under the disaster management program in Maharashtra?
- Construction of small dams and percolation tanks to control water flow.
- Afforestation (planting trees) to prevent soil erosion and landslides.
- Early warning systems for floods and landslides.
6. With reference to disaster management, what are the things in your house that you will check?
- Emergency first-aid kit and food supplies.
- Availability of flashlights, batteries, and drinking water.
- Strength and safety of electrical wiring and gas connections.
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