Q3.

Which of the following terms is used to describe the pollutants that originate from identifiable sources, such as factories or vehicles?

Q4.

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusion(s) logically follow(s) from the statements.

Statements:
I. All books are pencils.
II. All pencils are cardboards. 
III. All cardboards are notebooks.

Conclusions:
I. Some notebooks are pencils.
II. Some cardboards are books.
III. Some notebooks are books.

Q5.

Which term is used to describe the closeness of the measured value to the standard or true value?