7th Geography Term 3 Unit 3 Book Back Solutions

Samacheer Kalvi 7th Geography Term 3 Unit 3 Social Book Back Question and Answers:

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Geography – Term 3 Unit 3

Natural Hazards – Understanding of Disaster Management in Practice

I. Choose the correct answer:

1. _________ is a event which causes enormous physical damage to property, loss of life and change in the environment.
(a) Hazard
(b) Disaster
(c) Recovery
(d) Mitigation
Answer: (a) and (b)

2. Activities that reduce the effects of disaster
(a) Preparation
(b) Response
(c) Mitigation
(d) Recovery
Answer: (c) Mitigation

3. A sudden movement (or) trembling of the earth’s crust is called an _________
(a) Tsunami
(b) Earthquake
(c) Fire
(d) Cyclone
Answer: (b) Earthquake

4. A sudden overflow of water in a large amount caused due to heavy rainfall is called _________
(a) Flood
(b) Cyclone
(c) Drought
(d) Seasons
Answer: (a) Flood

5. Road accidents can be avoided by permitting the persons who have is _________ allowed to drive vehicle
(a) Ration card
(b) License
(c) permission
(d) Documents
Answer: (b) License

II. Fill in the blanks:

A hazard is a ______ event that can causes harm or damage to human and his property
Activities taken during a disaster is called ______
Displacement of water can produce one or more huge destructive waves known as ______
In case of fire accidents call the nearby police station or the no ______ for the fire service.
Disaster management refers to ______ of lives and property during a natural or man-made disaster.

Answer:

dangerous
Disaster management
Tsunami
101
conservation

III. Match the following:

Earthquake	–	Gigantic waves
Cyclone	–	Creak / Fault
Tsunami	–	Uneven rainfall
Industrial accident	–	Eye of the storm
Drought	–	Carelessness

Answer:

Earthquake	–	Creak / Fault
Cyclone	–	Eye of the storm
Tsunami	–	Gigantic waves
Industrial accident	–	Carelessness
Drought	–	Uneven rainfall

IV. Consider the following statement and tick the appropriate answer:

1. Assertion (A): In the modern world we can’t live happing everyday.
Reason (R): Due to pollution and environmental degradation we are undergoing natural hazard and Disaster.
(a) A and R are correct and A explains R
(b) A and R are correct but A does not explain R
(c) A is not correct but R is correct
(d) Both A and R are in correct
Answer: (b) A and R are correct but A does not explain R

2. Assertion (A): Sudden movement (or) trembling of the earth’s crust is called an Earthquake.
Reason (R): Movement of the tectonic plates, mass wasting, surface fault all leads to earthquake
(a) A and R are correct and A explains R
(b) A and R are correct but A does not explain R
(c) A is in correct but R is correct
(d) Both A and R are in correct
Answer: (b) A and R are correct but A does not explain R

V. Answer the following briefly:

1. Define Hazard.
Answer:
A hazard is a dangerous phenomenon, substance, human activity or condition that may cause loss of life, injury, health impacts, property damage, loss of livelihoods, services, social and economic disruption or environmental damage.

2. What is disaster?
Answer:
A disaster can be generally defined as “A serious disruption in the society causing widespread material, economic, social or environmental losses which exceed the ability of the affected society to cope using its own resources”.

3. What are the six concepts of Disaster management cycle?
Answer:
Preparation, Mitigation, Preparedness, Response, Recovery and Development are the six Disaster management cycles.

4. Name any two agency which involves in warring system in Tamil Nadu.
Answer:

TNSDMA
DDMA
SDRF

5. Waite about any three effects of flood.’
Answer:
Effects:

Loss of life and property,
Displacement of people and
Spread of contagious diseases such as cholera and Malaria etc.,

6. Give any four Rail safety tips.
Answer:

Stay alert. Trains can come from either direction at any time,
Never sit on the edge of the Station Platform,
Cross the tracks safely.

7. Name any four different industry which goes under industrial disaster frequently.
Answer:
Defense, Energy, Food and Mining.

VI. Distinguish between:

1. Earthquake and Tsunami.
Answer:

S. No	Earthquake	Tsunami
1.	A sudden movement or trembling of the earth’s crust is called as earthquake.	Huge destructive waves resulting in dis placement of water.
2.	It is caused due to movement of tectonic plates, mass wasting land slides, surface fault, etc.	It is caused due to under water earthquake.
3.	Its after math leads to loss of property, damage to buildings and loss of life.	It causes flooding and disrupts transportation power communication and water supply.

2. Flood and cyclone.
Answer:

S.No	Flood	Cyclone
1.	Sudden overflow of water in a large amount due to heavy rainfall, cyclone, melting of snow, Tsunami or cloud/ dam burst.	A low pressure area which is encircled by high pressure wind is called a cyclone.
2.	It causes loss of life and property and leads to spread of diseases such as cholera, malaria.	Effects include heavy rain strong wind, landfall leading to damage of life and properly.

3. Hazard and disaster
Answer:

S.No	Hazard	Disaster
1.	A dangerous phenomenon, substance, human activity or condition that may cause loss of life, injury, health impacts, social and economic disruption.	A disaster can be generally defined as “A serious disruption in the society causing widespread material, economic, social or environmental losses which exceed the ability of the affected society to cope using its own resources”.
2.	Hazards are geophysical and biological.	Disasters are Natural and man made.