Engineering Chemistry MCQs

By: Prof. Fazal Rehman Shamil

Engineering Chemistry MCQs

Solved MCQs engineering Chemistry.

The Corrosion of metals at the joints is minimized by joining dissimilar metals with adhesives due to which of the following?

(A).  The Metals are always covered with the adhesives

(B).  The Adhesive always act as the lubricator at the joints

(C).  The direct contact of metal to metal is avoided

(D).  Adhesives prevent exposure to an environment

(E). None of these

Multiple Choice Question Answer:  c

The Adhesives joints are leak-proof for which of the following?

(A).  Solids only

(B).   Both liquids and gases

(C).  Gases only

(D). Liquids only

(E). None of these

Multiple Choice Question Answer:  b

Joining labels to plastic cans or bottles is not possible if we do not use the adhesives.

(A).  False

(B).  True

(E). None of these

Multiple Choice Question Answer:  b

If the strength of the adhesive joint is which of the following then the mechanical joint is obtained by welding or riveting?

(A).  Less

(B).  More

(C).  Equals to

(D).  Very less

(E). None of these

Multiple Choice Question Answer:  a

Which of the following is the bond energy of a metallic bond?

(A).   100-350 kJ/mol

(B).  60 kJ/mol

(C).  20 kJ/mol

(D).  600-1200 kJ/mol

(E). None of these

Multiple Choice Question Answer:  a

Not an example of thermosetting synthetic resins is _______

(A).  Epoxy

(B).  Acrylic polyester

(C). Silicones

(D).  Cellulose derivatives

(E). None of these

Multiple Choice Question Answer:  d

The adhesive that is prone to brittle failure is ______

(A).   PF resin

(B). Acrylic polyester

(C).  UF resin

(D).  Epoxy

(E). None of these

Multiple Choice Question Answer:  a

which of the following are the epoxy resins that are the products of epichlorohydrin and bisphenol?

(A).  Free radical

(B).  Addition

(C).   Condensation

(D).  Ion-exchange

(E). None of these

Multiple Choice Question Answer:  c

On increasing the temperature, what will happen to the strength of the adhesive?

(A).  Remain same

(B).  Increases

(C).  First increases then decrease

(D).  Decreases

(E). None of these

Multiple Choice Question Answer:  d

We use the Epoxies in a wide diversity of applications due to their strength, durability, and great versatility.

(A).  False

(B).  True

(E). None of these

Multiple Choice Question Answer:  b

We use _________ as the curtain-wall sealants

(A).  Silicones

(B).  Polyurethane

(C).  Polyvinyls

(D).  Cellulose derivatives

(E). None of these

Multiple Choice Question Answer:  a

The Emulsion adhesives are based on which of the following?

(A).  Polyurethane

(B).  Polyvinyl acetate

(C).  Urea-formaldehyde

(D).  Collodion

(E). None of these

Multiple Choice Question Answer:  b

The Collodion is a mixture of cellulose nitrate with which of the following?

(A).  Carboxylic acid

(B).  Ketone

(C). Alcohol

(D).  Phenol

(E). None of these

Multiple Choice Question Answer:  c

What are The substances that are capable of uniting two other materials together by adhering strongly to the surface of both called?

(A).  Organic conducting polymers

(B).  Adhesives

(C). Biodegradable polymers

(D).  Composites

(E). None of these

Multiple Choice Question Answer:  b

The incorrect statement from the following is _____?

(A).  Two surfaces are instantly, economically, and easily joined to one another by the adhesives

(B).  The Bonding that is done by the adhesives gives smoother finished surfaces

(C).  The Adhesives bonding always require less after-finishing

(D).  The process of applying the adhesives requires very much highly specialized workers or the high heat

(E). None of these

Multiple Choice Question Answer:  d

 

Prof. Fazal Rehman Shamil