Disaster and Disaster Management

A disaster is a serious disruption of the functioning of a community or a society involving widespread human, material, economic or environmental losses. This note provides an information on disasters.

Summary

A disaster is a serious disruption of the functioning of a community or a society involving widespread human, material, economic or environmental losses. This note provides an information on disasters.

Things to Remember

  • A disaster is a serious disruption of the functioning of a community or a society involving widespread human, material, economic or environmental losses.
  • Natural disaster is the disaster which occurs naturally.
  • Disaster caused by humans is called man made disaster. Desertification, chemical disaster, machinery destruction, transport accidents etc are man made disaster.
  • According to the cause of disaster, we can control or prevent disaster.

MCQs

No MCQs found.

Subjective Questions

Q1:

Find the squares roots of 4


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Square of 4</p> <p>= 4<sup>2</sup></p> <p>= 4&times;4</p> <p>= 16</p>

Q2:

Find the squares roots of 10

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Square of 10</p> <p>= 10<sup>2</sup></p> <p>= 10&times;10</p> <p>= 100</p>

Q3:

Solve: \(\sqrt{1+3}\)


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\sqrt{1+3}\)</p> <p>= \(\sqrt{4}\)</p> <p>= \(\sqrt{2&times;2}\)</p> <p>= 2</p>

Q4:

Solve: \(\sqrt{1+3+5}\)

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\sqrt{1+3+5}\)</p> <p>= \(\sqrt{9}\)</p> <p>=\(\sqrt{3&times;3}\)</p> <p>= 3</p>

Q5:

Solve: \(\sqrt{1+3+5+7.....+99}\)

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\sqrt{1+3+5+7.....+99}\)</p> <p>= \(\frac{99+1}{2}\)</p> <p>= \(\frac{100}{2}\)</p> <p>= 50</p>

Q6:

Solve: \(\sqrt{1+3+5+7}\)

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\sqrt{1+3+5+7}\)</p> <p>= \(\sqrt{16}\)</p> <p>=\(\sqrt{4&times;4}\)</p> <p>= 4</p>

Q7:

Solve: (0.2)2


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>(0.2)<sup>2</sup></p> <p>= (0.2)&times;(0.2)</p> <p>= 0.04</p>

Q8:

Solve: (0.01)2


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>(0.01)<sup>2</sup></p> <p>= (0.01)&times;(0.01)</p> <p>=0.0001</p>

Q9:

Solve: (-3)2


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>(-3)<sup>2</sup></p> <p>= (-3)&times;(-3)</p> <p>=9</p>

Q10:

Solve: Square root of 81


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Square root of 81</p> <p>=\(\sqrt{81}\)</p> <p>=\(\sqrt{9&times;9}\)</p> <p>=9</p>

Q11:

Find the square root of 256


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>square root of 256</p> <p>= \(\sqrt{256}\)</p> <p>= \(\sqrt{2 &times; 2 &times;2 &times;2 &times;2&times; 2 &times;2&times; 2}\)</p> <p>= \(\sqrt{2^2&times; 2^2 &times;2^2 &times;2^2}\)</p> <p>= 2 &times; 2 &times; 2 &times;2</p> <p>= 16</p>

Q12:

Find the square root of 676


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>square root of 676</p> <p>=\(\sqrt{676}\)</p> <p>= \(\sqrt{2&times;2&times;13&times;13}\)</p> <p>= 2&times; 13</p> <p>= 26</p>

Q13:

Simplify: \(\sqrt{2^2×3^2}\)


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:<br>\(\sqrt{2^2&times;3^2}\)</p> <p>= 2 &times; 3</p> <p>= 6</p>

Q14:

Simplify: \(\sqrt{12}\)


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\sqrt{12}\)</p> <p>= \(\sqrt{2&times;2&times;3}\)</p> <p>= 2\(\sqrt{3}\)</p>

Q15:

Simplify:  \(\sqrt{25x^6 ×4y^2}\)


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>= \(\sqrt{25x^6 &times;4y^2}\)</p> <p>= \(\sqrt{5&times;5&times;(x^3)^2&times;2&times;2&times;y^2}\)</p> <p>= 5<sup></sup>&times; x<sup>3</sup>&times; 2<sup></sup>&times; y</p> <p>= 10x<sup>3</sup>y</p> <p></p>

Q16:

Find the square root of \(\frac{144}{400}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>square root of \(\frac{144}{400}\)</p> <p>= \(\sqrt\frac{144}{400}\)</p> <p>= \(\sqrt\frac{12&times;12}{20&times;20}\)</p> <p>= \(\frac{12}{20}\)</p> <p>=\(\frac{3}{5}\)</p>

Q17:

Find the square root of \(\frac{ 324}{625}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>square root of \(\frac{324}{625}\)</p> <p>= \(\sqrt\frac{324}{625}\)</p> <p>= \(\sqrt\frac{18&times;18}{25&times;25}\)</p> <p>= \(\sqrt\frac{18}{25}\)</p>

Q18:

 Find the square root of 1764.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="104"><tbody><tr><td>2</td> <td>1764</td> <td></td> </tr><tr><td>2</td> <td>882</td> <td></td> </tr><tr><td>3</td> <td>441</td> <td></td> </tr><tr><td>3</td> <td>147</td> <td></td> </tr><tr><td>7</td> <td>49</td> <td></td> </tr><tr><td></td> <td>7</td> <td></td> </tr></tbody></table><p>\(\sqrt{1764}\)</p> <p>= \(\sqrt{2&times;2&times;3&times;3&times;7&times;7}\)</p> <p>= 2&times; 3&times; 7</p> <p>= 42</p>

Q19:

Find the square root of 576.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="54"><tbody><tr><td>2</td> <td>576</td> </tr><tr><td>2</td> <td>288</td> </tr><tr><td>2</td> <td>144</td> </tr><tr><td>2</td> <td>72</td> </tr><tr><td>2</td> <td>36</td> </tr><tr><td>2</td> <td>18</td> </tr><tr><td>2</td> <td>9</td> </tr><tr><td></td> <td>3</td> </tr></tbody></table><p>\(\sqrt{576}\)</p> <p>= \(\sqrt{2&times;2&times;2&times;2&times;2&times;2&times;3&times;3}\)</p> <p>= 2&times;2&times;2&times;3</p> <p>= 24</p>

Q20:

Find the square root of \(\frac{64}{144}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>square root of \(\frac{64}{144}\)</p> <p>= \(\sqrt{\frac{64}{144}}\)</p> <p>= \(\sqrt{\frac{2&times;2&times;2&times;2&times;2&times;2}{2&times;2&times;2&times;2&times;3&times;3}}\)</p> <p>= \(\sqrt{\frac{2&times;2}{3&times;3}}\)</p> <p>= \(\frac{2}{3}\)</p>

Q21:

Find the square root of \(\frac{441}{1764}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>square root of \(\frac{441}{1764}\)</p> <p>= \(\sqrt{\frac{441}{1764}}\)</p> <p>= \(\sqrt{\frac{3&times;3&times;7&times;7}{2&times;2&times;3&times;3&times;7&times;7}}\)</p> <p>= \(\sqrt{\frac{1}{2&times;2}}\)</p> <p>= \(\sqrt{\frac{1^2}{2^2}}\)</p> <p>= \(\frac{1}{2}\)</p>

Q22:

Find the square root of \(\frac{400}{441}\).


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Square root of \(\frac{400}{441}\)</p> <p>= \(\sqrt{\frac{400}{441}}\)</p> <p>= \(\sqrt{\frac{2&times;2&times;2&times;2&times;5&times;5}{3&times;3&times;7&times;7}}\)</p> <p>= \(\sqrt{\frac{2^2&times;2^2&times;5^2}{3^2&times;7^2}}\)</p> <p>= \(\frac{2&times;2&times;5}{3&times;7}\)</p> <p>= \(\frac{20}{21}\)</p> <p></p>

Q23:

 Find the smallest number by which the number must be divided to obtain a perfect square.

512


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>512</p> <table width="82"><tbody><tr><td>2</td> <td>512</td> </tr><tr><td>2</td> <td>256</td> </tr><tr><td>2</td> <td>128</td> </tr><tr><td>2</td> <td>64</td> </tr><tr><td>2</td> <td>32</td> </tr><tr><td>2</td> <td>16</td> </tr><tr><td>2</td> <td>8</td> </tr><tr><td>2</td> <td>4</td> </tr><tr><td></td> <td>2</td> </tr></tbody></table><p>512 = 2<sup>2</sup>&times; 2<sup>2</sup>&times;2<sup>2</sup>&times;2<sup>2</sup>&times;2</p> <p>&there4; The required number is 2.</p>

Q24:

Find the square root of 6561.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Square root of 6561</p> <p>= \(\sqrt{6561}\)</p> <p>= \(\sqrt{3&times;3&times;3&times;3&times;3&times;3&times;3&times;3}\)</p> <p>= \(\sqrt{3^2&times; 3^2&times;3^2&times;3^2}\)</p> <p>= 3 &times; 3 &times; 3 &times; 3</p> <p>= 81</p>

Q25:

Find the square root of 4096.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Square root of 4096</p> <p>= \(\sqrt{4096}\)</p> <p>= \(\sqrt{2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2}\)</p> <p>= \(\sqrt{2^2&times;2^2&times;2^2&times;2^2&times;2^2&times;2^2}\)</p> <p>= 2&times;2&times;2&times;2&times;2&times;2</p> <p>= 64</p> <p>&there4; The square root of 4096 = 64.</p>

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Disaster and Disaster Management

Disaster and Disaster Management

 

Natural disaster
Natural disaster

A disaster is a serious disruption of the functioning of a community or a society involving widespread human, material, economic or environmental losses and impacts, which exceeds the ability of the affected community or society to cope using its own resources. There are two types of disaster. They are:

  1. Natural disaster: Natural disaster is the disaster which occurs naturally. Landslide, volcano, flood, hurricane, lightning, tsunami etc. are the examples of a natural disaster.
  2. Man-made disaster: Disaster caused by humans are the man-made disaster. Desertification, chemical disaster, machinery destruction, transport accidents etc are the man-made disaster.

Causes of disaster

A natural disaster is a disaster caused by nature, such as floods, volcanic eruptions, earthquakes, tsunamis, avalanches, lahars (volcanic mudslides), landslides, industrialization sinkholes, blizzards, drought, hailstorms, heat waves, hurricanes, tropical storms, typhoons, Ice Ages, tornadoes, and wildfires. Urbanization, industrialization, unscientific development, unscientific cultivation are the main causes of the disaster.

Disaster Management

There are various causes of the disaster. According to the cause of the disaster, we can control or prevent such disaster. Following are the methods to manage disaster:

  1. Pre-plan for the natural disaster.
  2. Rescuing the victims of natural disaster.
  3. Helping and rehabilitating the victim of the disaster.

 

Lesson

Environmental Degradation and its Conservation

Subject

Science

Grade

Grade 8

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