Fire and Epidemics Minimization and Management

Sometimes fire can catch house, shed, industry and forest which is called firing. This note provides us with an information about methods of minimizing and managing fire and epidemics.

Summary

Sometimes fire can catch house, shed, industry and forest which is called firing. This note provides us with an information about methods of minimizing and managing fire and epidemics.

Things to Remember

  • Sometimes fire can catch house, shed, industry and forest which is called firing.
  • Firing can be considered as man-made disaster however it can occur naturally in some cases.
  • Only purchase appliances and electrical devices that bear the label of a testing laboratory.
  • Check electrical wiring in your home. Fix frayed extension cords, exposed wires, or loose plugs.
  • Some diseases are transmitted faster and have negative effect on the existence of human beings. The outbreak of such disease is called epidemics.
  • Information about causes, symptoms and prevention should be provided to all.

MCQs

No MCQs found.

Subjective Questions

Q1:

Find the cube of 6 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>cube of 6</p> <p>= 6<sup>3</sup></p> <p>= 6&times;6&times;6</p> <p>= 216</p>

Q2:

Find the cube of 16


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Cube of 16</p> <p>= 16<sup>3</sup></p> <p>=16 &times;16 &times;16</p> <p>= 4096</p>

Q3:

State true or false:

  1. Cube of any odd number is even.
  2. A perfect cube doesn't end with two zeros.
  3. If the square of a number ends with 5, then its  cube ends with 8.
  4. There is no perfect cube which ends with 8.
  5. The cube of a two digit number may be a three digits numbers.
  6. The cube of a single  digits numbers may be a single digits number.

Type: Very_short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>False</li> <li>True</li> <li>True</li> <li>False</li> <li>False</li> <li>True</li> </ol>

Q4:

Find the cube root of 125


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>cube root of 125</p> <p>=\(\sqrt[3]{125}\)</p> <p>=\(\sqrt[3]{5&times;5&times;5}\)</p> <p>=\(\sqrt[3]{5^3}\)</p> <p>= 5</p> <table><tbody><tr><td>5</td> <td>125</td> </tr><tr><td>5</td> <td>25</td> </tr><tr><td></td> <td>5</td> </tr></tbody></table><p></p>

Q5:

Find the cube of 20


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Cube of 20</p> <p>= 20<sup>3</sup></p> <p>= 20 &times; 20 &times; 20</p> <p>= 8000</p> <p></p>

Q6:

Find the cube of the following number:

35


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Soln: Cube of 35=(35)<sup>3</sup></p> <p> =35&times;35&times;35</p> <p> =42875</p>

Q7:

Find the cube of 400


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Cube of 400</p> <p>= 400<sup>3</sup></p> <p>= 400&times;400&times;400</p> <p>= 64000000</p>

Q8:

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

81


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width=""><tbody><tr><td>3</td> <td>81</td> </tr><tr><td>3</td> <td>27</td> </tr><tr><td>3</td> <td>9</td> </tr><tr><td></td> <td>3</td> </tr></tbody></table><p>81 = 3&times;3&times;3 =3<sup>3</sup></p> <p>&there4; The required number is 3.</p>

Q9:

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

 182


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table><tbody><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>128 = 2<sup>3</sup>&times;2<sup>3</sup>&times;2</p> <p>&there4;The required number is 2.</p>

Q10:

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

 135


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table><tbody><tr><td>3</td> <td>135</td> </tr><tr><td>3</td> <td>45</td> </tr><tr><td>3</td> <td>15</td> </tr><tr><td></td> <td>5</td> </tr></tbody></table><p>135 = 3<sup>3</sup>&times; 5</p> <p>&there4;The required number is 5.</p>

Q11:

Find the cube root of 1331


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Cube root of 1331</p> <p>= \(\sqrt{1331}\)</p> <p>= \(\sqrt[3]{11 &times;11 &times;11}\)</p> <p>= 11</p> <table><tbody><tr><td>11</td> <td>1331</td> </tr><tr><td>11</td> <td>121</td> </tr><tr><td></td> <td>11</td> </tr></tbody></table><p></p>

Q12:

Find the smallest number by which the number must be multiplied to obtain a perfect cube.

243


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="33"><tbody><tr><td>3</td> <td>243</td> </tr><tr><td>3</td> <td>81</td> </tr><tr><td>3</td> <td>27</td> </tr><tr><td>3</td> <td>9</td> </tr><tr><td></td> <td>3</td> </tr></tbody></table><p>243 = 3<sup>3</sup>&times; 3<sup>2</sup></p> <p>&there4;The required number is 3.</p>

Q13:

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

192

 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table><tbody><tr><td>2</td> <td>192</td> </tr><tr><td>2</td> <td>96</td> </tr><tr><td>2</td> <td>48</td> </tr><tr><td>2</td> <td>24</td> </tr><tr><td>2</td> <td>12</td> </tr><tr><td>2</td> <td>6</td> </tr><tr><td></td> <td>3</td> </tr></tbody></table><p>192 = 2<sup>3</sup>&times;2<sup>3</sup>&times;3</p> <p>&there4;The required number is 3.</p> <p></p>

Q14:

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

625


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table><tbody><tr><td>5</td> <td>625</td> </tr><tr><td>5</td> <td>125</td> </tr><tr><td>5</td> <td>25</td> </tr><tr><td></td> <td>5</td> </tr></tbody></table><p>325 = 5<sup>3</sup>&times;5</p> <p>&there4;The required number is 5.</p>

Q15:

Find the smallest number by which  the  number must be multiplied to obtain a perfect cube.

675


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table><tbody><tr><td>3</td> <td>675</td> </tr><tr><td>3</td> <td>225</td> </tr><tr><td>3</td> <td>75</td> </tr><tr><td>5</td> <td>25</td> </tr><tr><td></td> <td>5</td> </tr></tbody></table><p>675 = 3<sup>3</sup>&times;5<sup>2</sup></p> <p>&there4;The required number is 5.</p>

Q16:

Find the cube root of 4096.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="110"><tbody><tr><td>2</td> <td>4096</td> </tr><tr><td>2</td> <td>2048</td> </tr><tr><td>2</td> <td>1024</td> </tr><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>= \(\sqrt{2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2&times;2}\)</p> <p>= \(\sqrt[3]{2^3&times;2^3&times;2^3&times;2^3}\)</p> <p>=2 &times; 2 &times; 2 &times; 2</p> <p>= 16</p>

Q17:

Find the cube root of 2744.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="96"><tbody><tr><td>2</td> <td>2744</td> </tr><tr><td>2</td> <td>1372</td> </tr><tr><td>2</td> <td>686</td> </tr><tr><td>7</td> <td>343</td> </tr><tr><td>7</td> <td>49</td> </tr><tr><td></td> <td>7</td> </tr></tbody></table><p></p> <p>= \(\sqrt[3]{2&times;2&times;2&times;7&times;7&times;7}\)</p> <p>= \(\sqrt[3]{2^3&times;7^3}\)</p> <p>= 2 &times; 7</p> <p>= 14</p> <p>&there4; The Cube root of 2744 is 14.</p>

Q18:

Find the cube root of 3375.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="64"><tbody><tr><td>3</td> <td>3375</td> </tr><tr><td>3</td> <td>1125</td> </tr><tr><td>3</td> <td>375</td> </tr><tr><td>5</td> <td>125</td> </tr><tr><td>5</td> <td>25</td> </tr><tr><td></td> <td>5</td> </tr></tbody></table><p></p> <p>= \(\sqrt[3]{3&times;3&times;3&times;5&times;5&times;5}\)</p> <p>= \(\sqrt[3]{3^3&times;5^3}\)</p> <p>= 3 &times; 5</p> <p>= 15</p> <p>&there4; The Cube root of 3375 is 15.</p>

Q19:

Find the cube root of 10648.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="90"><tbody><tr><td>2</td> <td>10648</td> </tr><tr><td>2</td> <td>5324</td> </tr><tr><td>2</td> <td>2662</td> </tr><tr><td>11</td> <td>331</td> </tr><tr><td>11</td> <td>121</td> </tr><tr><td></td> <td>11</td> </tr></tbody></table><p>= \(\sqrt[3]{2&times;2&times;2&times;11&times;11&times;11}\)</p> <p>= \(\sqrt[3]{2^3&times;11^3}\)</p> <p>= 2 &times; 11</p> <p>= 22</p> <p>&there4; Cube root of 10648 is 22.</p>

Q20:

Simplify: \(\sqrt[3]{216}\) ÷ \(\sqrt[3]{64}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="58"><tbody><tr><td>2</td> <td>216</td> </tr><tr><td>2</td> <td>108</td> </tr><tr><td>2</td> <td>54</td> </tr><tr><td>3</td> <td>27</td> </tr><tr><td>3</td> <td>9</td> </tr><tr><td></td> <td>3</td> </tr></tbody></table><p></p> <table width="84"><tbody><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></p> <p>\(\sqrt[3]{\frac{2&times;2&times;2&times;3&times;3&times;3}{2&times;2&times;2&times;2&times;2&times;2}}\)</p> <p>= \(\sqrt[3]{\frac{3^3}{2^3}}\)</p> <p>= \(\frac{3}{2}\)</p> <p></p> <p></p>

Q21:

Simplify: \(\sqrt[3]{8}\) + \(\sqrt[3]{27}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <table width="39"><tbody><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></p> <table width="51"><tbody><tr><td>3</td> <td>27</td> </tr><tr><td>3</td> <td>9</td> </tr><tr><td></td> <td>3</td> </tr></tbody></table><p>= \(\sqrt[3]{2&times;2&times;2}\) + \(\sqrt[3]{3&times;3&times;3}\)</p> <p>=\(\sqrt[3]{2^3}\) + \(\sqrt[3]{3^3}\)</p> <p>= 2 + 3</p> <p>= 5</p>

Q22:

Simplify:

\(\sqrt[3]{27}\) × \(\sqrt[3]{-27}\).


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\sqrt[3]{3&times;3&times;3}\)&times; \(\sqrt[3]{-3&times;-3&times;-3}\)</p> <p>= \(\sqrt[3]{3^3}\)&times; \(\sqrt[3]{(-3^3}\))</p> <p>= 3&times;(-3)</p> <p>= -9</p>

Q23:

Simplify: \(\sqrt[3]{8}\) + \(\frac{1}{\sqrt[3]{8}}\)


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>\(\sqrt[3]{2&times;2&times;2}\) + \(\frac{1}{\sqrt[3]{2&times;2&times;2}}\)</p> <p>= \(\sqrt[3]{2^3}\) + \(\frac{1}{\sqrt[3]{2^3}}\)</p> <p>= 2 + \(\frac{1}{2}\)</p> <p>= \(\frac{2&times;2 +1&times;2}{2}\)</p> <p>= \(\frac{5}{2}\)</p>

Q24:

Simplify: \(\sqrt[3]{8}\) - \(\frac{1}{\sqrt[3]{27}}\).


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>= \(\sqrt[3]{3&times;3&times;3}\) - \(\frac{1}{\sqrt[3]{3&times;3&times;3}}\)</p> <p>= 3 - \(\frac{1}{3}\)</p> <p>= \(\frac{3&times;3-1&times;1}{3}\)</p> <p>= \(\frac{9-1}{3}\)</p> <p>= \(\frac{8}{3}\)</p>

Q25:

Find the cube root of 400.


Type: Long Difficulty: Easy

Show/Hide Answer
Answer: <p>Solution:</p> <p>Cube root of 400</p> <p>= (400)<sup>3</sup></p> <p>= 400 &times; 400 &times; 400</p> <p>= 64,000,000</p> <p>&there4; Cube root of 400 is 64,000,000.</p>

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Fire and Epidemics Minimization and Management

Fire and Epidemics Minimization and Management

fire management
fire management

Fire Minimization and Management

Sometimes the fire can catch house, shed, industry and forest which is called firing. Forest firing can be very destructive. Firing can be considered as man-made disaster however it can occur naturally in some cases. Following are the precaution for firing:

  1. Avoid smoking in bed, or when drowsy or medicated.
  2. Keep matches and lighters up high, away from children.
  3. Make sure your home heating source is clean and in working order. Especially cooking gas.
  4. Use portable heaters in well-ventilated rooms only.
  5. Check electrical wiring in your home. Fix frayed extension cords, exposed wires, or loose plugs.
  6. Only purchase appliances and electrical devices that bear the label of a testing laboratory.
  7. Store combustible materials in open areas away from heat sources.
  8. Place rags used to apply household chemicals in metal containers with tight-fitting lids.
  9. Get out as quickly as and as safely as possible during firing.
  10. Try to use a fire extinguisher on a fire if available.
  11. Call fire brigade immediately.
  12. Rescue the victim.

Epidemics management
Epidemics management

Epidemics Minimization and Management

Some diseases are transmitted faster and have the negative effect on the existence of human beings. The outbreak of such disease is called epidemics. Following are the methods to control and manage the epidemics:

  1. The awareness programme should be conducted through various media.
  2. The environment should be kept clean.
  3. Many programmes related to health should be conducted in rural areas.
  4. Water resources should be kept clean.
  5. The victim should be provided with the medication needed for the epidemics.
  6. Information about causes, symptoms and prevention should be provided to all.

Lesson

Environmental Degradation and its Conservation

Subject

Science

Grade

Grade 8

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