Pulp & Paper Questions and Answers – Molecular Weight of Polymers

This set of Pulp and Paper Multiple Choice Questions and Answers (MCQs) focuses on “Molecular Weight of Polymers”.

1. __________ consist of individual polymers with varying molecular weights. The properties of the polymers depend on the distribution of molecular weights.
a) Monodisperse
b) Polydispersity
c) Cellulose chain
d) Synthetic polymer
View Answer

Answer: a
Explanation: Synthetic polymers consist of individual polymers with different molecular weights. The properties of the polymers depend not only on the average molecular weight but on the distribution of molecular weights as well.

2. Several methods utilized to characterize polymers give average molecular weights that depend on the molecular weight distribution as well as the number average molecular weight.
a) True
b) False
View Answer

Answer: a
Explanation: Most of the methods are utilized to characterize polymers give average molecular weights that depend on the molecular weight distribution as well as the number average molecular weight.

3. A __________ depicted as Mn, Let Ni equal the number of the molecules or moles or other calculated of number of molecules with mass M, or a calculated of mass such as D.P.
a) Number average molecular weight
b) Number mean molecular weight
c) Number median molecular weight
d) Number mode molecular weight
View Answer

Answer: a
Explanation: The 1st is a simple average where each molecule contributes equally to the average a number average molecular weight depicted as Mn. Let Ni equal the number of the molecular or moles or other measure of number of molecular with mass M, or a measure of mass such as D.P.
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4. A number average molecular weight is obtained by methods that solely depend on the colligative properties of polymer solutions.
a) True
b) False
View Answer

Answer: a
Explanation: A number average molecular weight is extracted by methods which solely depend on the colligative properties of polymer solutions.

5. One such method is vapour phase __________ that indirectly measures vapor pressures of polymer solutions.
a) Symmetry
b) Osometry
c) Isentropic
d) Adiabatic
View Answer

Answer: b
Explanation: Such methods are limited to low molecular weight polymers several thousand grams per mole or less. This method has the drawback that it does not represent the behaviour of polymer mixtures very well. Vapor phase osmometry indirectly measures vapour pressures of polymer solutions.
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6. The __________ is always higher than the number average molecular weight, except for the special case when they are equal if all of the polymers have the exact same molecular weight.
a) Weight average molecular weight
b) Weight average cation weight
c) Weight average anion weight
d) Weight average quinon weight
View Answer

Answer: a
Explanation: The weight average molecular weight is always greater than the number average molecular weight, except for the special case when they are equal if all of the polymers have the exact same molecular weight example a monodisperse sample, the ratio is then greater than one.

7. What is the name of the hidden part?
a) Number average molecular weight
b) Weight average
c) Monodisperse
d) Polydispersity
View Answer

Answer: a
Explanation: The number average molecular weight is the total weight of the sample divided by the number of molecules in the sample. It could be calculated by the above formula for the react.
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8. What is the name of the hidden part?

_________= (ΣNi x ΣMi) / (ΣNi)

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a) Number average molecular weight
b) Weight average
c) Monodisperse
d) Polydispersity
View Answer

Answer: a
Explanation: Then number average molecular weight is the total weight of the sample divided by the number of molecules in the sample. It could be calculated by the above formula for a particular react.

9. What is the name of the hidden part?

________= (ΣNi x ΣDPi) / (ΣNi)

a) Number average molecular weight
b) Weight average
c) Monodisperse
d) Polydispersity
View Answer

Answer: b
Explanation: A weight average molecular weight is determined by light scattering methods but is limited to relatively great molecular weights.

10. What is the name of the hidden part?

_________ = (ΣNi x ΣDP2i) / (ΣNi x DPi)

a) Number average molecular weight
b) Weight average
c) Monodisperse
d) Polydispersity
View Answer

Answer: b
Explanation: A weight average molecular weight is calculated by light scattering methods but is limited to relatively great molecular weights.

Sanfoundry Global Education & Learning Series – Pulp and Paper.
To practice all areas of Pulp and Paper, 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]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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