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41
The stones obtained by blasting are used as
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Answer: Option D
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42
Which of the following stresses is used for identifying the quality of structural steel?
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Answer: Option B
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43
Sea sand used in structures causes
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Answer: Option D
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44
Cross cut saw is used for
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Answer: Option B
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45
Wrought iron contains carbon upto
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Answer: Option A
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46
Which of the following sedimentary rocks changes into quartzite by metamorphic action?
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Answer: Option A
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47
Non acid-resistant asbestos is:
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Answer: Option B
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48
Bitumen completely dissolves in
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Answer: Option D
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49
For the manufacture of Portland cement, the proportions of raw materials used, are
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Answer: Option A
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50
Galvanising means covering iron with a thin coat of
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Answer: Option B
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