What percent of opacity means that the exhaust is so dark that it ...

[lidoalex]

What percent of opacity means that the exhaust is so dark that it completely blocks light from a beam projected through the exhaust smoke?
 
  A) 0 B) 50 C) 100 D) 25

Question 2

The diesel particulate filter in the exhaust system is used to trap ________.
 
  A) Rust from inside the exhaust system B) Fine sand particles
  C) CO2 particles D) Soot

[cclemon1]

Answer to Question 1

C

Answer to Question 2

D

[lidoalex]

Thanks for the timely response, appreciate it

[meow1234]

Wow, this really help