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Showing posts with label noise pollution. Show all posts
Showing posts with label noise pollution. Show all posts

Wednesday 1 July 2015

The percentage of carbon in cast iron is

Post 197

Question 93 The percentage of carbon in cast iron is:
A) 6 to 8
B) 3 to 5
C) 0.1 to 0.25
D) 0.5 to 1.5
Answer: 3 to 5


Question 94 The unit of noise pollution (level) is
A) decibel
B) decimal
C) ppm
D) None of These
Answer: decibel
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