The plastics made from cellulose resin are as clear as glass are tough and stron

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Question
The plastics made from cellulose resin
Options
A. are as clear as glass
B. are tough and strong
C. possess excellent electrical properties
D. All the above.

Correct Answer

All the above.

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5. For the manufacture of Portland cement, the proportions of raw materials used, are
Options
A. lime 63% ; silica 22% ; other ingredients 15%
B. lime 22% ; silica 63% ; other ingredients 15%
C. silica 40% ; lime 40% ; other ingredients 20%
D. silica 70% ; lime 20% ; other ingredients 10%.

6. Pick up the correct statement from the following:
Options
A. For thin structures subjected to wetting and drying, the water cement ratio should be 0.45
B. For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55
C. For thin structures which remain continuously under water, the water-cement ratio by weight should be 0.55
D. For massive concrete structures which remain continuously under water, the water cement ratio by weight should be 0.65
E. All the above.

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