Plastics

Plastics is a synthetic polymer. They can be designed in any shape by applying heat or pressure. This note provides information on types, uses, and effects of plastics.

Summary

Plastics is a synthetic polymer. They can be designed in any shape by applying heat or pressure. This note provides information on types, uses, and effects of plastics.

Things to Remember

  • Plastics is a synthetic polymer. They can be designed in any shape by applying heat or pressure.
  • There are two types of plastics. They are thermosetting plastics and thermoplastics.
  • Plastics is used as a good insulator of electric wire.
  • Plastics is used to make different types of vehicles, make pipeline fitting, water tank, gags, thermal and electrical insulator, etc.
  • Plastics  is use even in fans and wings of plane.

MCQs

No MCQs found.

Subjective Questions

Q1:

Construct a quadrilateral PQRS in which PQ = 4.2 cm, QR = 6.5 cm, RS = 8 cm, SP = 5.3 cm and SQ = 7.4 cm. Take a point Z on PQ produced such that area of \(\triangle\)PSZ = area of quadrilateral PQRS.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/116.png" alt="figure" width="246" height="190"></p> <p></p> <p></p> <p>Construct:</p> <p>Quadrilateral PQRS and \(\triangle\)PSZ</p> <p>Results:</p> <p>Area of quadrilteral PQRS = Areaof \(\triangle\)PSZ where;</p> <p>PQ = 4.2 cm, QR = 6.5 cm, RS = 8 cm, SP = 5.3 cm, SQ = 7.4 cm.</p>

Q2:

Construct a quadrilaeral in which PQ = QR = 5.1 cm, PS = RS = 6.2 cm and QS = 5.6 cm. Consttruct a triangle equal in area to the quadrilateral.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/210.png" alt="figure" width="250" height="168"></p> <p></p> <p></p> <p>To construct:</p> <p>Quadrilateral PQRS and \(\\triangle\)PST</p> <p>Result:</p> <p>Area of quadrilateral PQRS = Area of \(\triangle\)PST</p> <p>where, PQ = QR = 5.1 cm, PS = RS = 6.2 cm and QS= 5.6 cm.</p>

Q3:

Construct a parallelogram ABCD in which AB = 6 cm, BC = 4 cm and \(\angle\)BAD = 60° then construct a triangle AEF equal in area to the parallelogram having a side AE = 7.5 cm.\triangle\)AEF = 7.5 cm.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/33.png" alt="figure" width="250" height="199"></p> <p></p> <p></p> <p>To construct:</p> <p>parallelogram ABCD and \(\triangle\)AEF</p> <p>Result:</p> <p>Area of pallelogram ABCD = Area of \(\triangle\)AEF</p> <p>where, AB = 6 cm, BC = 4 cm, \(\angle\)BAD = 60&deg; and one side of \(\triangle\)AEF = 7.5 cm.</p>

Q4:

Construct a quadrilateral ABCD in which AB = BC = 5.6 cm, CD = AD = 4.9 cm and \(\angle\)BAD = 60°, construct a triangle equal in area of quadrilateral ABCD.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/46.png" alt="figure" width="250" height="163"></p> <p></p> <p></p> <p>To construct:</p> <p>quadrilateral ABCD and \(\triangle\)ABE</p> <p>Result:</p> <p>Area of quadrilateral ABCD = Area of \(\triangle\)ABE</p> <p>where,AB = BC = 5.6 cm, CD = AD = 4.9 cm and \(\angle\)BAD = 60&deg;.</p>

Q5:

Construct a quadrilateral ABCD where AB = 4.2 cm, BC = 4.8 cm, CD = 5.4 cm, DA = 5.8 cm and diagonal BD = 5.8 cm construct the triangle equal in area to the quadrilateral ABCD.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/57.png" alt="figure" width="250" height="163"></p> <p></p> <p></p> <p>Construct:</p> <p>quadrilateral ABCD and \(\triangle\)ADE</p> <p>Results:</p> <p>Area of quadrilateral ABCD = Area of \(\triangle\)ADE</p> <p>where, Ab = 4.2 cm, BC = 4.8 cm, CD = 5.4 cm, DA = 5.8 cm.</p>

Q6:

Construct a quadrilateral ABCD in which AB = 5 cm, diagoals AC = 6.6 cm and BD = 8 cm respectively. Construct the rectangle ASTU equal in area of the quadrilateral ABCD.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/68.png" alt="figure" width="250" height="172"></p> <p></p> <p></p> <p>To construct:</p> <p>quadrilateral ABCD and rectangle ASTU</p> <p>Result:</p> <p>area of quadrilateral ABCD = Area of rectangle ASTU</p> <p>where, AC = 6.6 cm, BD = 8 cm, AB = 5 cm.</p>

Q7:

Construct quadrilateral PQRS in which PQ = QR = 5.9 cm, RS = Ps = 6.1 cm and \(\angle\)QPS = 75°. Construct a triangle PST equal in area to the quadrilateral.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/74.png" alt="figure" width="250" height="170"></p> <p></p> <p></p> <p>To construct:</p> <p>quadrilateral PQRS = \(\triangle\)PST</p> <p>Results:</p> <p>Area of quadrilateral PQRS = Area of (\triangle\)PST</p> <p>where,PQ = QR = 5.9 cm, RS = Ps = 6.1 cm and \(\angle\)QPS = 75&deg;.</p>

Q8:

Construct  quadrilateral ABCD in which AB = 8 cm, BC = 3.5 cm, CD = 7 cm, DA = 6 cm and \(\angle\)BAD = 60°. Also construct a triangle equal in area to the quadrilateral.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/85.png" alt="figure" width="250" height="165"></p> <p></p> <p></p> <p>To construct:</p> <p>quadrilateral ABCD = \(\triangle\)ADE</p> <p>Results:</p> <p>Area of quadrilateral ABCD = Area of \(\triangle\)ADE</p> <p>where,AB = 8 cm, BC = 3.5 cm, CD = 7 cm, DA = 6 cm and \(\angle\)BAD = 60&deg;.</p>

Q9:

Costruct a triangle ABC in which a = 7.8 cm, b = 7.2 cm and c = 6.3 ccm then construct a parallelogram DBEF equal in area to \(\triangle\)ABC having \(\angle\)DBC = 75°.

  




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/95.png" alt="figure" width="250" height="213"></p> <p></p> <p>To construct:</p> <p>\(\angle\)ABC and parallelogram BEFD</p> <p>Results:</p> <p>Area of \(\triangle\)ABC = Area of parallelogram BEFD</p> <p>where a = 7.8 cm, b = 7.2 cm, c = 6.3 cm and an angle of parallelogram \(\angle\)DBC = 75&deg;.</p>

Q10:

Construct a triangle PQR in which PQ = 6 cm, QR = 7 cm and RP = 4 cm. Construct a rectangle equal in area to the triangle.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p></p> <p><img src="/uploads/106.png" alt="figure" width="250" height="176"></p> <p></p> <p>To construct:</p> <p>\(\triangle\)PQR and rectangle ARCB</p> <p>Results:</p> <p>Area of \(\triangle\)PQR = Area of rectangle ARCB</p> <p>in whichPQ = 6 cm, QR = 7 cm and RP = 4 cm.</p>

Q11:

Construct a \(triangle\)ABC in which AB = 4.5 cm, BC = 6.5 cm nd \(\angle\)C = 60°. Also construct another \(\triangle\)DBC which is equal in area to the \(\triangle\)ABC such that DB = 8 cm.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/117.png" alt="figure" width="250" height="193"></p> <p></p> <p>To construct:</p> <p>\(\triangle\)ABC and \(\triangle\)DBC</p> <p>Results:</p> <p>Area of \(\triangle\)ABC = Area of \(\triangle\)DBC</p> <p>where, AB = 4.5 cm, BC = 6.5 cm, \(\angle\)C = 60&deg;, DB = 8 cm.</p>

Q12:

Construct a \(\triangle\)ABC in which a = 7.8 cm, b = 7.2 cm and c = 6.3 cm then construct a parallelogram equal in area to \(\triangle\)ABC having an angle of parallelogram 75°.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/123.png" alt="figure" width="250" height="231"></p> <p></p> <p>Construct:</p> <p>\(\triangle\)ABC and parallelogram PCQR</p> <p>Resuts:</p> <p>Area of \(\triangle\)ABC = Area of parllelogram PCQR</p> <p>where, a = 7.8 cm, b = 7.2 cm, c = 6.3 cm and \(\angle\)RPC = 75&deg;.</p>

Q13:

Construct a triangle PQR in which PQ = 7.5 cm, QR = 6.8 cm and RP = 6 cm then construct a parallelogram TQSU equal in area to \(\triangle\)PQR having a side TQ = 6.4 cm.





 


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/145.png" alt="figure" width="250" height="185"></p> <p></p> <p>To construct:</p> <p>\(\triangle\)PQR and parallelogram TQSU</p> <p>Results:</p> <p>Area of \(\triangle\)PQR = Area pf parallelogram TSQU</p> <p>in whichPQ = 7.5 cm, QR = 6.8 cm and RP = 6 cm and TQ = 6.4 cm.</p>

Q14:

Construct a \(\triangle\)ABC in which a = 5 cm, b = 4.8 cm and c = 6.8 cm. Construct the parallelogram equal in area to \(\triangle\)ABC having an angle of the parallelogram is 45°.




Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p><img src="/uploads/132.png" alt="figure" width="250" height="169"></p> <p></p> <p>Construct:</p> <p>\(\triangle\)ABC and parallelogram PBQR</p> <p>Results:</p> <p>Area of \(\triangle\)ABC = Area of parallelogram PBQR</p> <p>where,a = 5 cm, b = 4.8 cm and c = 6.8 cm and \(\angle\) RPB = 45&deg;.</p>

Q15:

Construct a parallelogram PQRS in which PQ = 5 cm, diagonal PR = 6 cm and diagonal QS = 8 cm. Construct a triangle PSA whose area is equal to the area of parallelogram PQRS.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <figure class="inline-left" style="width: 250px;"><img src="/uploads/155.png" alt="figure" width="250" height="334"><figcaption>figure</figcaption></figure><p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p><br>Result:</p> <p>Area of parallelogram PQRS = Area of \(\triangle\)PSA</p> <p>where, QS = 8 cm, PR = 6 cm and PQ = 5 cm.</p>

Q16:

Construct a triangle ABC having sides AB = 4 cm, BC = 6.8 cm and CA = 6.5 cm then construct a rectangle equal in area to \(\triangle\)ABC.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <figure class="inline-left" style="width: 250px;"><img src="/uploads/162.png" alt="figure" width="250" height="232"><figcaption>figure</figcaption></figure><p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p>Results:</p> <p>Area of \(\triangle\)ABC = Area of rectngle BDEF</p> <p>where AB = 4 cm, BC = 6.8 cm and CA = 6.5 cm.</p>

Q17:

Construct a quadrilateral having AB = 5.2 cm, BC = 5 cm, CD = 4.2 cm, Ad = 4 cm and \(\angle\)ABC = 60°. Construct \(\triangle\)ADE whose area is equal to the quadrilateral ABCD.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <figure class="inline-left" style="width: 250px;"><img src="/uploads/172.png" alt="figure" width="250" height="121"><figcaption>figure</figcaption></figure><p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p>Results:</p> <p>Area of quadrilateral ABCD = Area of \(\triangle\) ADE</p> <p>where, AB = 5.2 cm, BC = 5 cm, CD = 4.2 cm, AD = 4 cm and \(\angle\)ABC = 60&deg;.</p>

Q18:

Construct a quadrilateral PQRS in which PQ = 5 cm, QR = 5.5 cm, RS = 5.5 cm, RP = 7 cm and \(\angle\)PRS = 30°. Now, construct a \(\triangle\)QRT whose area is equal to the area of the quadrilateral PQRS.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <figure class="inline-left" style="width: 250px;"><img src="/uploads/183.png" alt="figure" width="250" height="184"><figcaption>figure</figcaption></figure><p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p>Results:</p> <p>Area of quadrilateral PQRS = Area of \(\triangle\)QRT</p>

Q19:

Construct a quadrilateral ABCd having Ab = 6 cm, Bc = 5.5 cm, AC = 6.5 cm, CD = 8 cm and AD = 7 cm. Construct a \(\triangle\)ABE equal in area to the quadrilateral ABCD.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <figure class="inline-left" style="width: 250px;"><img src="/uploads/191.png" alt="figure" width="250" height="180"><figcaption>figure</figcaption></figure><p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p></p> <p>Results:</p> <p>Area of rectangle ABCD = Area of \(\triangle\)ABE</p>

Videos

Constructions
Constructing Triangles
Constructing a Parallelogram
Plastics

Plastics

Plastics is a synthetic polymer. They can be designed in any shape by applying heat or pressure.

Types of plastics

  1. Thermosetting plastics:

    The plastics that does not become soft on heating and cannot be remolded into desired shapes is called thermosetting plastic. It is hard and strong. It becomes harder when heated but it does not melt. It is generally resistant to heat. That is why they are used as heat bearing insulator. It is used in electric switches, plugs, handles of pressure cooker and tea kettle, radio and TV cabinets, etc Bakelite, Melamine, etc are some examples of it.

    source:www.intercosmo.net
    source:www.intercosmo.net

  2. Thermoplastics:

    The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. It is usually elastic and soft. It can be given any shape when they are heated again and again.It means they can be remolded second time for different purpose. They are used in making ropes, bucket, pipe, etc. The main types if thermoplastics are polythene, Polyvinyl Chloride(PVC) and polystyrene.

Properties of plastics

  • Plastics are lighter than metals, wood and stone.So, the articles of plastic can be easily carried.
  • It does not corrode in air and water.
  • It is not affected by acids and other chemicals.
  • It is usually hard and transparent.
  • It can be made in various colors.

Uses

  • It is a bad conductor of heat and electricity. So, it is used as a good insulator of electric wires.
  • It is also used for making different types of vehicles.
  • It is also used to make pipeline fitting, water tanks, water bags, etc.
  • They can be used as thermal and electrical insulators.
  • It is airproof, waterproof and non reactive. So, it is used for packing purpose as well.
  • It is light and easy to use.So, it is used even in fans and wings ofplane. Light things causereduction in the consumption of oil.

Demerits

  • It is non biodegradable.
  • It causes soil, water and air pollution.
  • Some plastic catch fire easily and when burnt they produce poisonous gases and smoke.
  • It cannot be seen as good as stone or wood.

Lesson

Materials Used In Daily Life

Subject

Science

Grade

Grade 10

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