Chemical Process Calculation Questions and Answers – Signifiant Figures

This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Signifiant Figures”.

1. The given numbers are shown with their significant figures respectively. Find out the wrong one option?
a) 26.24 and 4
b) 24000. and 5
c) 0.000460 and 3
d) 28000.0 and 5

Explanation: Zero after a decimal point counts in significant figure.

2. The theoretical production rate of a chemical is 1µg/(mL)(min.). What is the actual production rate of the chemical in lb mol/ (day)(ft3) with an efficiency of 98%?
a) 0.0880
b) 0.0800
c) 0.0449
d) 0.529

Explanation: 1 lb mole = 454 g mole and 1 L = 3.531×10-2 ft3.

3. Standard form of 2145.67 is
a) 2.14*103
b) 2.14567*103
c) 0.214*104
d) None of the mentioned

Explanation: 21456.7 = 2.14567*103.

4. Correctly rounded, the quotient 5.000 g / 50.0 mL is
a) 0.10 g/mL
b) 0.1 g/mL
c) 0.100 g/mL
d) 0.1000 g/mL

Explanation: The measurement with the least number of significant digits determines the number of significant digits in the quotient.

5. Correctly rounded, the product 3.000 cm × 30.0 cm is
a) 9.0 x 101 cm2
b) 9.000 x 101 cm2
c) 9 x 101 cm2
d) 9.00 x 101 cm2

Explanation: The measurement with the least number of significant digits determines the number of significant digits in the quotient.
Note: Join free Sanfoundry classes at Telegram or Youtube

6. Number of digits that are reasonably sure, called significant figures.
Above given definition is
a) Correct
b) Incorrect
c) Probably correct
d) None of the mentioned

Explanation: Number of digits that are reasonably sure, called significant figures.

7. 0.009046879855, round off the number to three significant figures
a) 0.0905
b) 0.0904
c) 0.09046
d) 0.09035

Explanation: In such situation we round up the last digit from 4 up to 5.

8. How many significant numbers are there in 420?
a) 1
b) 2
c) 3
d) 0

Explanation: Zero does not count in significant number here.

9. Using the proper number of significant figures 6 X 6 equals to
a) 3
b) 4
c) 36
d) 40

Explanation: Significant figure in 40 is only one that is same as 6.

10. How many significant figures are there in 0.002000?
a) 1
b) 2
c) 3
d) 4

Explanation: Zero after the point counts.

Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]