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__________ material is made of black polythene having a thickness of about. 50 mm to 1 mm.

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__________ material is made of black polythene having a thickness of about. 50 mm to 1 mm.

(a) Brick

(b) Stone

(c) Plastic sheet

(d) Cement concrete

I had been asked this question in a job interview.

This key question is from Dampness in chapter Damp Proofing, Water Proofing and Termite Proofing of Construction & Building Materials

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Right choice is (c) Plastic sheet

Explanation: The plastic sheets are made of black polythene having a thickness of about 0.50 mm to 1 mm with usual width of wall and it is available in roll length of 30 metres. This treatment is relatively cheap but it is not permanent.

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