Pulp and Paper Multiple Choice Questions on “Chemical Analysis of Paper”.
1. The value of mineral residue left after the complete combustion of organic material represents the latex.
a) True
b) False
Answer: b
Clarification: The value of mineral residue left after the complete combustion of organic material represents the ash content.
2. Ash content is a measure of filler content in papers containing clay, and CaCO3.
a) True
b) False
Answer: a
Clarification: Ash content’s a measure of filler content in papers containing clay, CaCO3, or TiO2 fillers and soda content in brown papers.
3. _________ with energy dispersive x-ray analysis (E.D.A.X.) is a very useful tool for qualitative and semi-quantitative analysis of elements.
a) Scattering electron microscopy
b) Scattering ion microscopy
c) Scanning electron microscopy
d) Scanning ion microscopy
Answer: c
Clarification: Scanning electron microscopy (S.E.M.) with energy dispersive x-ray analysis (E.D.A.X.) is a very important tool for qualitative and semi-quantitative analysis of elements with atomic no. of 13 or higher aluminium on the surface of paper.
4. _________ is very important for looking at element distributions upon the surface or through the thickness of paper if cross-sections are made.
a) Scattering electron microscopy
b) Scattering ion microscopy
c) Scanning electron microscopy
d) Scanning ion microscopy
Answer: c
Clarification: Selecting electron microscopy(S.E.M.) is very useful for looking at element distributions on the surface or through the thickness of paper if cross-sections are made.
5. Elements are bombarded with electron and they give off X-rays at frequencies which are measured in energy units of electron volts. What is the name of the process?
a) Scanning ion microscopy
b) Scattering ion microscopy
c) Scattering electron microscopy
d) Scanning electron microscopy
Answer: d
Clarification: Elements are bombarded with electron and they release X-rays at frequencies which are measured in energy units of electron volts. With proper calibration, the no. of X-ray’s released show the relative amount of that material.
6. The determination of Na, Ca, Cu, Fe, and Mg content of pulp and paper is done by _________
a) Atomic absorption microscopy
b) Electronic absorption microscopy
c) Ionic absorption microscopy
d) Electronic adsorption microscopy
Answer: b
Clarification: The determination of Na, Ca, Cu, Fe, and Mg content of pulp and paper by atomic absorption spectroscopy.
7. The adhesive on top of the coating does not alter the spectrum except to attenuate the signal, since the adhesive contains only light elements. The coated sheet contains these elements in addition to _________
a) Zinc and chloride
b) Zinc and hydrochloride
c) Zinc silicate and hydrochloride
d) Magnesium and chloride
Answer: a
Clarification: The coated sheet contains these elements in addition to Zn and Cl (possibly from a zinc oxide filler.) The adhesive on top of the coating does not alter the spectrum except to attenuate the signal, since the adhesive contains only light elements and absorbs some of the electrons before they can reach other elements beneath them.
8. _________ method has numerous important widespread applications to scale residues, corrosion products, and sludge analysis. The method is simple, fast, and reliable.
a) Scattering electron microscopy
b) Scattering ion microscopy
c) Scanning electron microscopy
d) Scanning ion microscopy
Answer: c
Clarification: Scanning electron microscopy method has numerous important widespread applications to scale residues, corrosion products, and sludge analysis. The method is simple, fast, and reliable.
9. The use of various types of _________ is becoming increasingly important in paper in order to increase its strength and to increase the retention of fines, fillers, and other materials.
a) Lignin
b) Pulpwood
c) Starch
d) Gum
Answer: c
Clarification: The use of various types of starch is becoming increasingly important in paper in order to increase its strength and to increase the retention of fines, fillers, and other materials. In the latter case, cationic starches are commonly used.
10. _________ may be measured qualitatively by an iodine solution or quantitatively by HCl extraction followed by colorimetric determination with iodine.
a) Lignin
b) Pulpwood
c) Starch
d) Gum
Answer: c
Clarification: Starch may be measured qualitatively by an iodine solution or quantitatively by HCl extraction followed by colorimetric determination with iodine.
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