Unit 3 - PHCP

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Chapter 3

Chemistry - Unit 3

Change No.3: Paints, Varnishes, Insulators, Polymers, Adhesives & Lubricants

(Q.1 to Q.95 – 1 Mark, Q.96 to Q.103 – 2 Marks)

1. Which of the following is not a constituent of Paint ? *

1 Mark

Pigment

Thinners

Antiskinning agents

Alcohol

2. Which of the following pigment gives white colour to the paint?*

1 Mark

Chroming oxide

Ferric oxide

Zinc oxide

Brown umber

3. The function of pigment is -------------*

1 Mark

reduces the fluidity of paint

Provides opacity to the paint

improve the drying quality of paint

prevent gelling and skinning of the paint film

4. The constituent which increases the random arrangement of pigment particles in paint are --------------*

1 Mark

thinners

pigments

fillers /Extenders

driers

5. The constituent which reduces the fluidity of paint is ------------*

1 Mark

antiskinning agent

driers

fillers /extenders

thinner

6. An example of bad thermal insulator is *

1 Mark

potassium

paper

cork

wool

7. Handles of saucepans and other cooking utensils are made up of -------------*

1 Mark

thermal conductors

thermal insulators

shares of heat

insulators of electricity

8. An example of conductor of heat is --------*

1 Mark

Paper

Cloth

Air

Aluminium

9. The insulation ability thermal insulator with the presence of moisture would *

1 Mark

Increase

decrease

remain unaffected

none of above

10. Glasswool is good insulator because it has *

1 Mark

free electrons

atoms colliding frequency

porous body

low density

11. Thermal conductivity of glasswool varies from sample to sample because of variation in *

1 Mark

composition

density

porosity

All of above

12. Which plastic material contains strong cross linking in their molecular structure?*

1 Mark

Thermoplastic materials

Thermosetting materials

Both a & b

None of above

13. Which of the following is an example of thermoplastic material?*

1 Mark

Epoxy resin

Nylon 6,6

Teflon

Bakelite

14. The polymers cannot be recycled*

1 Mark

Thermoplasts

Thermosets

Elastomers

All poymers

15. Name polymer among the polymers which do not soften on heating.*

1 Mark

Bakelite

Polythene

Polystyrene

PVC

16. Name the polymers occur naturally*

1 Mark

Starch and nylon

starch and cellulose

proteins and nylon

proteins and PVC

17. Which is used in the formation of epoxy resin ? *

1 Mark

phenol

Bisphenol

formaldehyde

Ethylene

18. Polyvinyl chloride is prepared from the monomer ____________*

1 Mark

Ethyl chloride

Formaldehyde

Vinyl Chloride

Ethylene

19. The example of linear polymer is ---------------*

1 Mark

polystyrene

Nylon 66

Epoxy resin

Bakelite

20. The monomer of vinyl chloride contains -----------------*

1 Mark

single bond

double bond

triple bond

None of above

21. Epoxy resin is prepared from ------------------*

1 Mark

cpicholrohydrin and bisphenol

epichlorohydrin and phenol

bisphenol and phenol

epichlorohydrin and formaldehyde

22. The thermosetting synthetic adhesive is ----------------*

1 Mark

starch

phenol formaldehyde resin

asphalt

shellac resin

23. In adhesive bonding, which one of the following is the term used for the parts that are joined -----------------*

1 Mark

adherend

adherent

adhesive

infinitum

24. The polymer which can be used as synthetic adhesive is ---------------*

1 Mark

Neoprene

Buna-S

Epoxy resin

polystyrene

25. The purpose of fabrication is ----------------------*

1 Mark

to reduce friction

to reduce wear

reduce commotion

all of above

26. Which one is not a example of solid lubricant?*

1 Mark

Graphite lubricant

Molybdenum disulphide lubricant

Polytertrafluoroethylene lubricant

Multigame Lubricant

27. Apart from reducing frication and wear, the secondary purpose (s) of Lubricate is /are -------------*

1 Mark

heat dissipation

reducing corrosion

both (a) and (b)

none of these

28. For rocket and submarine the Lubricant use is -------------------------*

1 Mark

animal oil

vegetable oil

Mineral oil

synthetic oil

29. The type of lubricant use for cutting tools is ------------------*

1 Mark

solid lubricant

liquid lubricant

Semisolid lubricant

all of above

30. Solid Lubicant is used for ------------------*

1 Mark

cutting tool

steam turbine

Sewing machine

gun parts

31. Oiliness is the property of lubricant ------------------------*

1 Mark

absorb on the surface

adsorb on the surface

mixed with surface

none of the above

32. Which of the following is not true for lubricants? *

1 Mark

A good lubricant should have high mechanical stability

A good lubricant should have low volatility .

A good lubricant should form stable emulsion with water

A good lubricant should have high viscosity index .

33. The temperature at which oil ceases to flow from a on a machinery part is called ----------------------------------*

1 Mark

flash point

pour point

fire point

34. The example of solid lubricant is ---------------------*

1 Mark

grease

Vaseline

castor oil

talk

35 . Repeatable unit of polymers ---------------------*

1 Mark

isomer

copolymer

homopolymer

mer

36. Turpentine oil in paints is used as a -------------------*

1 Mark

pigment

film forming material

thinner

drier

37. Lubrication is necessary to protect wear and tear caused due to ----------------*

1 Mark

electrostatic force

gravitational force

frictional force

magnetic force

38. Select the incorrect statement from the following option :*

1 Mark

Lubricant keep out dirt

Lubricant act as a seal

Lubricant transmit fluid power

Lubricant enhance corrosion

39. The viscosity of petroleum oil for hydraulic lifts is ---------------------*

1 Mark

high

low

moderate

very high

40. On increasing the lubrication, the efficiency of the machine -----------------*

1 Mark

Increases

Decreases

Remain same

Does not get affected

41. Which of the following statement is incorrect about the Teflon ? *

1 Mark

It has high density of the order 2.1 to 2.3 gm/cm³

It has excellent electrical insulation properties

It has high coefficient of friction

It is dense and chemically inert

42. Select the incorrect statement from the following option. *

1 Mark

Thennosets have 3- dimensional , cross-linked network structure

Thermosets cannot be remolded, reused or reclaimed

Thermosets are hard, strong and brittle

Thermosets are soluble in suitable solvent.

43. Which of the following is not an example of thermosets? *

1 Mark

Epoxy

Teflon

Vulcanised rubber

Bakelite

46. Which of the following act as initiator in free- radical polymersiation the polymerization? *

1 Mark

Grignard reagent

Lewis acids

Benzoyl peroxide

Putassium amide

48. Select the incorrect statement from the following option *

1 Mark

Thermosets are formed by condensation polymerization reactions

The mosels have 3-D cross-inked network structure

Thermosets soften on heating and stiffen on cooling

Thermosets are generally insoluble in any solvent

49. Which of the following is a conducting polymer? *

1 Mark

Polyaniline

Polyacetylene

Polypyrole

All the above

50. The monomer tetrafluoethylene can be used for the preparation of --------*

1 Mark

PMMA

Polyurethane

Teflon

Polyethylene

51. A lubricant is used primarily to prevent ---------------*

1 Mark

Volatility

acidity

oiliness

none of these

52. A lubricant is used primarily to prevent ------------------*

1 Mark

corrosion of metals

oxidation of metal

wearing cut of rubbing metallic surface

redaction of metals

53. A suitable lubricant for watches --------------*

1 Mark

Grease

Graphite

Hazel-nut oil

palm oil

54. A good lubricant should have*

1 Mark

Low viscosity index

High viscosity index

Low fire point

High volatility

55. Capacity of oil to stick on the surface of machine parts under condition of heavy load is called *

1 Mark

Volatility

Oiliness

Acid value

Flash point

56. In case of liquid lubricants. Generally *

1 Mark

Flash point is higher than the fire point

Fire point is higher than the flash point

Fire point is lower than the flash point

Flash and fire point are identical.

57. When the resistance to movement of sliding/moving parts is only due to internal resistance between the lubricant itself and lubricant is called *

1 Mark

fluid film

boundary

thin film

extreme pressure.

58. Grease are not used to lubricate *

1 Mark

rail axel boxes

gears

bearing working at high temperature

delicate instruments

59. Machines operating at high temperature and load are best lubricated by -----*

1 Mark

mineral oils

solid lubricants

grease

animal oil

60. Single most important property of lubricated oil is ----------*

1 Mark

its fire point

cloud point

oiliness

viscosity

61. Viscosity of oil is measured by using --------*

1 Mark

redwood viscometer

say bolt viscometer

all of the above

62. The temperature at which lubricating oil will give of sufficient vapours to form combustible mixture with air is known as ------*

1 Mark

flash point

fire point

pour point

combustion point

63. Which temperature for lubricating oil will be lower?*

1 Mark

Flash point

fire point

pour point

Boiling point

64.Which engine has the highest air fuel ratio*

1 Mark

petrol engine

Diesel engine

gas turbine

65. Example of inorganic thermal insulator is *

1 Mark

mineral wool

rubber

none of above

66. Which is the example of thermal insulator *

1 Mark

glass wool

asbestos

polyurethane foam

calcium silicate

67. Which is the example of natural adhesive *

1 Mark

Asphalt

polyvinyl acetate

Epoxy resin

None of above

68. Polymer that softens on heating and stiffens on cooling is called *

1 Mark

thermoset

thermoplastic

elastomer

rubber

69. Which of the following may not be used as a criteria for classification of polymer ?.*

1 Mark

Number of monomers

structure /shape

thermal behavior

None of above

70. Polymer with low degree of polymerization is known as *

1 Mark

high polymer

oligomer

macromolecule

copolymer

71.The compound that can be used as initiator in addition polymerization is*

1 Mark

potassium dichromate

pottasim sulphate

benzoyl peroxide

any of the above

72. Formation of polymers from unsaturated monomers *

1 Mark

exothermic process

endothermic process

Depends on the compound used

cannot be predicted

73.The species responsible for the propogation of polymerization reaction of ethylene using benzoyl peroxide as inhibitor is *

1 Mark

cation

anion

free radical

any of above

74. An example of chain growth polymer is *

1 Mark

nylon 6,6

Bakelite

terylene

Teflon

75. An example of step groeth polymer is *

1 Mark

Teflon

Polybutadiene

bakelite

76. Which of the following polymer is formed by condensation polymerization *

1 Mark

polyethylene terephthalate

polyethylene

polystyrene

polypropylene

77. Increase in viscosity of the medium is a major disadvantage in a) bulk polymerization*

1 Mark

bulk polymerization

solution polymerization

suspention polymerization

emulsion polymerization

78. which of the following is copolymer *

1 Mark

polythene

polyurethane

plexiglass

79. which of the following is homopolymer*

1 Mark

Buna-S

Styrene acrylonitrile

polyvinyl chloride

Buna-N

80. which of the following has the largest molecular mass *

1 Mark

Monomer

Dimer

Oligomer

polymer

81. A polymer has higher T₈ value is *

1 Mark

PVC

polyethylene

polypropylene

polystryrene

82.Chemical resistance of a polymer decrease with*

1 Mark

increase in crystallinity of a polymer

increase in cross linking

increase in molecular mass

None of above

83. Adttives added to increase the resilience flexibility of a polymer are called*

1 Mark

stabilizers

accelemnors

plasticizers

fillers

84. Additives are added to polymer to*

1 Mark

improve mechanical properties

impart color

impart stability to weathering

all of above

85.The polymer likely to be attacked easily by acids and alkali is *

1 Mark

polypropylene

polystyrene

PVC

polyester

86. which of the following polymer is hard *

1 Mark

linear

branched chain

cross linked

thermoplastic

87.The polymer used in making gaskets and filters in chemical industry is *

1 Mark

polytetrafluoroethylene

polymethylmethacrylic acid

polyethylene

polystyrene

88.Polymer used in making laser disks and rear lights in cars is *

1 Mark

polytetrafluoroethylene

polymethylmethacrylate

polyethylene

polystyrene

89. Phenol – formaldehyde resin is commercially called ---------*

1 Mark

PVC

Bakelite

elastomer

nylon

90. Low density polyethene is obtained by using*

1 Mark

Anionic catalyst

Free radical indicator

Ziegler –Natta catalyst

cationic catalyst

91. Phenol formaldehyde is an example of *

1 Mark

Thermo elastic polymer

Thermo setting polymers

Thermite polymers

92.Which of the following is a thermo setting polymers?*

1 Mark

PVC

Poly styrene

Poly ethylene

Epoxy resin

93.The example of thermosetting polymer is *

1 Mark

PMMA

PVA

Teflon

urea formaldehyde

94. Which of the following can be used as monomers for polymerization?*

1 Mark

NH₃

CH₃CH₂COOH

HOCH₂OH

All of above

95. Select the polymer from the following options which do not softened on heating.*

1 Mark

PVC

Bakelite (Phenol formaldehyde resin)

polyethylene

All of above

96. ______ pigment gives white colour to the paint.*

1 Mark

Chromium oxide

Zinc oxide

Ferric oxide

Brown umber

97. The function of pigment is __________ .*

1 Mark

reduces the fluidity of paint

improve the drying quality of paint

prevent gelling and skinning of the paint film

provides opacity to the paint

98. A thermoplastic polymer is formed by the phenomenon of .*

1 Mark

addition polymerization

condensation polymerization

Crystallization

None of above

99. Select the adhesive which is used in the sealing operation in food industry ____________*

1 Mark

cellulose derivatives

silicon resins

epoxy resins

Polyvinyl

100. What is the repeating unit of polythene?*

1 Mark

F₂C = CF₂

H₂C=CH₂

H₂C=CHCI

H₂C=CH.C6H5

101. Epoxy resin is prepared from ------------------*

1 Mark

cpicholrohydrin and bisphenol

epichlorohydrin and phenol

bisphenol and phenol

epichlorohydrin and formaldehyde

102. Epoxy resins are obtained from ---------*

1 Mark

bisphenol A and formaldehyde

phenol and formaldehyde

bisphenol A and epichlorohydrin

bisphenol A and alkyl didisocyanates

103. the property desirable for a polymer which exihibit elastomeric property is that *

1 Mark

It should have flexible chains with strong intermolecular forces

It should have rigid chains with strong intermolecular forces

It should have flexible chains with weak intermolecular forces

It should have rigid chains with weak intermolecular forces

104. Thermoplastic materials are those materials which *

1 Mark

Are flexbile and can withstand considerable wear under suitable condition

are formed into shape under heat and pressure and results in a permantly hard product

Do not become hard with the application of heat and pressure and no chemical change occurs

are used as a friction lining for cluches and brakes

105. The function of piston ring in internal combustion engine in *

1 Mark

to prevent lubrication oil from entering the combustion space.

to prevent leakage of combustion chamber products past piston

to transfer heat from piston to cylinder walls.

all of above.

106. Select the incorrect statement form the following options *

1 Mark

when in form ready for further working polymers are called resins

The chemical process lending to the formation of polymer is known as polymerization

the fumbler of monomeric units contained in polymer is called degree of polymerization

Due to their small size, polymers are also called macromolecules

107. Select the incorrect statement from the following option: *

1 Mark

Condensation polymerization requires two reactive functional groups to be present at both ends of the monomer.

No by-product is formed in condensation Polymerisation

In condensation polymerization growth of chain occurs at minimum of the two active centres

In condensation Polymersation, , polymer MW rises steadily throughout the reaction

108. Which of the following statement is incorrect about the Teflon? *

1 Mark

It has high density of the order 2.1 to 2.3 gm/cm³

It has excellent electrical insulation properties

It has excellent coefficient of friction

It is dense and chemically inert.

110. Select the polymer from the following options which do not softened on heating*

1 Mark

PVC

Bakelite (Phenol formaldehyde resin)

polyethylene

All the above

111. ______ pigment gives white colour to the paint.*

1 Mark

Chromium oxide

Zinc oxide

Ferric oxide

Brown umber

112. The function of pigment is __________ *

1 Mark

reduces the fluidity of paint

improve the drying quality of paint

prevent gelling and skinning of the paint film

provides opacity to the paint

113. A thermoplastic polymer is formed by the phenomenon of *

1 Mark

addition polymerization

condensation polymerization

Crystallization

None of above

114. Select the adhesive which is used in the sealing operation in food industry *

1 Mark

cellulose derivatives

silicon resins

epoxy resins

Polyvinyl

Chemistry - Unit 3

Change No.3: Paints, Varnishes, Insulators, Polymers, Adhesives & Lubricants

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