101. For making spiral staircases, ideal material is
(a) pig iron
(b) cast iron
(c) wrought iron
(d) steel
ans- B
102. Purest form of iron is
(a) pig iron
(b) cast iron
(c) wrought iron
(d)s steel
ans-C
103. Carbon content in wrought iron is
(a) 0.15%
(b) 0.25 to 1.5%
(c) 2 to 4%
(d) more than 4%
ans-A
104. The ratio of tensile strength to compressive strength of steel is
(a) less than 1
(b) equal to 1
(C) more than 1
(d) nothing can be said definitely
ans-B
105. Ribs are made on steel wires to increase
(a) strength is compression
(b) strength is tension
(c) bond strength
(d) fatigue quality
ans-c
106. The property of metal enabling it to be drawn into thin wire is known as
(a) malleability
(b) ductility
(c) toughness
(d) plasticity
ans-B
ise Education, Reprise InnovetiBs
107. The property of the metal enabling it to be trans formed it into diferent shapes by heating is
a, b, c, d as per Question No. 106
ans- A
108. The property of metals due to which it can withstand shock is
a, b, c, d as per Question No. 107
Non-ferrous Materials
109. Market form of copper is/are
(a) ingots
(b) sheets
(c) tubes
(d) all of the above
ans - D
110. The ore from which aluminium is extracted economicallyis
a) kaolin
(b) kryolite
(c) corundu
d) bauxite
ans-D
111. Specifie gravity of aluminium is
a) )1.5
D) 2.7
c)3.5
(d) 4.2
ans-B
112. Zinc is
(a) an alloy of aluminium and copper
(b) an alloy of aluminium and chrome
(c) an alloy of copper and chrome
d) a metal
ans-C
113. The heaviest metal is
a)steel
b) lead
(c) tin
(d) cast iron
ans-A
114. Which of the following metal is poisonous
(a) aluminium
b) tin
C) )lead
(d) copper
Alloys
ans-B
115. Duralumin is an alloy of
Rep
lnnovatons
(a) aluminium and copPper
(b) aluminium, copper, nickel and magnesium
(C) alumini um and zinc
(d) aluminium and tin
ans-c
116. Which of the following is a variety of aluminium alloy
(a) duralumin
(b) aldural
(C) Y-alloy
(d) all the above
ans-B
117. Aluminium alloys used in building bodies of aeroplane are
(a) duralumin and aldural
(b) aldural and aluminium bronze
(C) aluminium bronze and Y-alloy
(d) Y-alloy and duralumin
ans-A
118. Which one of the following is hotlvatfety ofbrësgngineering net
(a) white brass
(6) yellow brass
(c) red brass
(d) brown brass
ans-c
119. Bronze is an alloy of
(a) aluminium and copper
(b) copper and zinc
(C) copper and tin
(d) none of the above
ans- D
120. The constituents of stainless steel are
(a) steel, chromium and nickel
(b) steel and nickel
(c) steel and manganese
(d) steel and molybdenum
ans-D
121. Quick lime is
(a) calcium carbonate
(b) calcium oxide
(c) calcium hydroxide
(d) none of the above
ans-B
122. When fat lime is slaked, its volume
(a) decreases to 50%
(6) remains same
(c) increases by 2 to 2.5 times
(d) increases by 4 times.
ans- c
123. Which one of the following statement is correct?
(a) Fat lime contains hardly 5% clay
(b) Hydraulic lime contains 5,30% clay
(c) Poor lime contains more than 30% clay
(d) All the above
Ans- A
124. For plastering work lime used is
(a) quicklime
(6) fat lime
(c) hydraulic lime
(d) poor lime
ans- c
125. Hydraulie lime is obtained by
(a) burning kankar
(b) calcination of limestone
(c) slaking quicklime
(d) calcination of pure clay
ans- c
126. The process of adding water to quicklime in order to convert it into hydrated lime is known as
(a) quenching
(b) hydration
(c) calcination
(d) slakingg
Ans-D
127. The commonly used lime for whitewashing is
(a) hydraulie lime
(b) lean lime
(c) fat lime
(d) quicklime
ans- C
128. Quicklime on reaction with water gives
(a) calcium oxide
(b) calcium carbonate
(c) calcium hydroxide
(d) none of the above
ans-c
129. The lime which has property of setting in water is known as
(a) fat lime
(b) hydraulic lime
(c) quicklime
(d) magnesium lime
ans- B
130. The fuxel generally used for burning lime stone is
(a) firewood
(b) charcoal
(c) coal
(d) any one of these
ucation, Re
ans-A
131. Fat lime
(a) slakes rapidly with considerable evolution of heat
(b) has high plasticity
(c) takes longer to develop adequate strength
(d) all of the above
ans- D
132. The main constituent which imparts hydraulicity to hydraulic lime is
(a) calcium oxide
(6) silica
(C)c
(d) water
la y
ans- c
133. The constituent responsible lor selling of hydraulic lime under waler is
(a) calcium oxide
(b) clay
(c) silica
(d) carbon dioxide
ans- c
134. The process of heating limestone to redness is termed as
(a) hydration
(b) carbonation
(c) oxidation
(d) calcination
ans- D
135. The major constituent of cement is
(a) lime
(b) silica
(c) alumina
(d) iron oxide
ans- A
136. The constituent which imparts strength to cement is
lime
(a)
(b) silica
(c) alumina
(d) magnesia
ans- A
137. The constituent which imparts colour to cement is
(a) lime
(b) silica
(c) alumina
(d) iron oxide
ans- D
138. Rotary kiln used in manufacturing cement rotates at a speed of
(a) 1-3 rpm
(b) 10-12 rpm
(c) 18-22 rpm
(d) more than 25 rpm
cation, Reprise Innovatin
ans- A
139. The cliker is formed at a temperature of
(a) 500-600° C
(b) 900-1000° C
(c)1100-1300° C
(d) 1400-1500° C
ans- D
140. The amount of gypsum added in the manufacture of cement is
(a) 0.1-0.5%
(b) 0.5-1%%
(c) 1-3.0%
(d) 3-4%
ans-D
141. Gypsum is added in the manufacture of Portland cement to
(a) reduce setting time of cement
(b) increase setting time of cemeiewnloaded
(c) to enhance the strength of cement
(d) to decrease grinding time
ans- B
142. Gypsum is added during the manufacture of cement
(a) while mixing the raw materials
(b) during burning in the kiln
(c) at the beginning of grinding the clinker
(d) after grinding the clinker
ans- C
143. Specific surface of cement is
(a) measure of fineness
(6) measure of volume of cement
(c) measure of smoothness of cement
(d) none of the above
ans- A
144. Specific surface of cement should not be less than
(a) 100 cm-/gm
(b) 1500 cm/gm
(c) 2000 cm-/gm
(d) 2250 c/gm
ans- D
145. Specification for setting time of ordinary Portland cement are:
Initial setting lime
Final seting lime
30 min
30 mm
30 min
600 m
(a)
(b)
(c)
(d)
<600 m
600 min
30 min
600 min
Innova
ans- C
146. The compound responsible for initial setting of cement is
(a) Tricalcium aluminate
(b) Tricalcium silicate
(c) Dicalcium silicate
(d) Tetra alumino ferrite
ans- A
147. The compound that hydrates early and is responsible for gain in strength in 28 days is
a, b, c, d as in Question No. 146.
ans- B
148. The compound that hydrates slowly and responsible for gain of strength over a period of I year
a, b, c, d as per Question No. 146.
ans- C
149. Unsoundness in cement is due to
(a) free lime
(b) free magnesia
(c) insufficient grinding
(d) all the above
ans - A
150. Le Chatelier apparatus is used tor testing cement for ts
(a) strength
(b) setting time
(c) fineness
(d) soundness
ans-D
151. At the end of the test on cement, increase in the distance between the two indicators of Le
Chatelier apparatus should not be more than
(a) 5 mm
(b) 10 mm
(c) 15 mm
(d) 20 mm
ans- B
152. 43-grade cement has a strength of 43 N/mmf at the age of
(a) 3 days
(b) 7 days
(c) 28 days
(d) I year
ans- C
153. Vicat apparatus is used for determining
(a) initial setting time of cement
(b) final setting time of cement
(c) normal consistency of cement
(d) all of these
ans- D
154. Normal consistency of cement is about
(a) 7%
b) 14%
c)21%
(d)28%
ans- D
155. Addition of Pozzolana to Portland cement causes
(a) increase in heat of hydration
(b) increase in strength
(c) increase in water tightness
(d) all the above
ans-c
156. Blast furnace slag cement is
(a) durable
(b) gains strength slowly
(c) cheap
(d) all the above
ans- D
157. High alumina cement is
(a) more resistant to sulphate atteknl
(b) more resistant to acid attack
(c) gains almost full strength within 24 hours after adding water
(d) all the above
ans- A
158. Which one of the following is not correct statement about fly ash blended cement?
(a) They have superior resistance to weathering action.
(6) They gain strength fast.
(c) Ultimate strength is same as OPC.
(d) All the above.
ans- B
159. To prevent setting of cemet during storage the material added to cement during grinding is
(a) acidol
(b) oleic acid
(c) oxidized petroleum
(d) any of the above
ans- A
160. Rapid hardening cement is produced by
(a) increasing the lime content
(b) burning it at high temperature
(C) grinding to a finer size
(d) all the above
ans- D
162. Which statement given below is wrong? The pigment used to produce coloured cement
(a) cobalt oxide to get blue colour.
(b) chloride oxide to get green colour.
(c) manganese oxide to get brown colour.
(d) aluminium oxide to get white colour.
ans- D
163. Identify the correct statement given below: The natural Pozzolanic material is/are
(a) clay
(b) shale
(c) volcanic sand
(d) all the above
ans-D
164. Which one of the following is not a Pozzolanic material?
(a) fly ash
(b) rice husk ash
(c) gypsum
(d) blast furnace slag
ans- C
165. Silica fumes have found their use in
(a) punped concrele
(b) high strength concrete
(c) shuterete application
(d) all the above
ans- D
166. For testing compressive strength of cement, the size of cubes used is
(a) 50 mm
(b) 70.6 mm
(c) 100 mm
(d) 150 mm
ans- B
167. The sand in mortar
(a) prevents shrinkage
(b) spreads mortar
(c) allows carbon dioxide from the atmosphere to penetrate deeply
(d) all the above
ans- D
168. An aggregate is called fine aggregate if it is completely passes through
(a) 150 micron sieve
(b) 300 micron sieve
(c) 600 micron sieve
(d) 4.75 mm sieve
ans- D
169. The aggregate is called coarse aggregate if it is completely retained on
(a) 20 mm sieve
(b) 12 mm sieve
(c) 8 mm sieve
(d) 4.75 mm sieve
ise Edunation, Reprise Innovatinns
ans-D
170. Due to bulking of sand, increase in volume is as high as
(a) 5%
(b) 15%
(c) 25%
(d) 30-40%
ans-D
171. Maximum increase in the bulk of sand is at the moisture contet
(a) 2-4%
(b) 4-6%
(c)8-10%
(d) 12-15%
ans- C
72. Bulking of sand is due to
(a) water films
(b) swelling of sand
(c) added mass of water
(d) none of the above
ans- A
173. Which one of the following is not a desirable property of sand?
(a) It should be chemically active.
(b) It should contain sharp, angular grains.
(c) It should be hard.
(d) It should be well graded.
ans- A
174. The increase in volume of sand when water is added is known as
(a) segregation
(b) bleeding
(c) bulking
(d) honeycombing
ans- C
175. The cement to dry sand proportion recommended for masonry work is
(a) 1:3
(6)T
(c) 1
(d) 1: 12
10
ans- B
176. The cement to dry sand proportion recommended for plastering external wall is
(a) 1:3-1:4
(b)1:6
(c) 1: 8
(d)1: 10
ans- a
177. The cement to dry sand proportion recommended for plastering concrete surface is
(a) 1:3
(6) 1:6
(c) 1
(d) 1: 10
8
ans- A
178. The cement to dry sand proportion for pointing work is
(a) 2
(6) 1
(c)1:6
(d) 1:8
:4
ans-A
179. The inert material to be used for making lime mortar is
(a)s sand
(b) surkhi
(c) cinder
(d) any of the above
ans- D
180. Gauged cement mortar consisßofloaded From: www.EasyEnginering.net
(a) cement and sand
(b) cement, surkhi, sand
(c) cement, lime, sand
(d) cement, cinder, sand
ans- C
181. Briquettes are the specimen of mortar used for finding
(a) compressive strength
(b) tensile strength
(c) flexural strength
(d) shear strength
ans- B
182. Fineness modulus is
(a) the ratio of fine aggregates to coarse aggregate.
(b) the ratio of fine aggregates to total aggregate.
(c) an index which gives the mean size of the aggregates used in a mix.
(d) none of the above.
ans- C
183. Which one of the following statement is wrong?
(a) Lime concrete is used as base course for foundations
(b) Lime concrete is used as base course to ground floor.
(c) Lime concrete is used to make roof waterproof.
(d) It is used for R.C.C structural elements.
ans- D
184. Which one of the following statement is wrong? In the absence of mix design, the ingredients of
conerete are proportioned as
(a) 1: 1:2- mass concrete work
(b) 1:1:3-water tanks
(c) 1:2:4- slabs, beams
(d) I:3: 6-sills of windows
cation, Repris
Innovetb
ans- A
185. M: 20 concrete means
(a) 1:2:4concrete
(b) concrete with a strength of 20 kg'cm after 28 days
(c) concrete with a strength of 20 N/mmr after 7 days
(d) concrete with a strength of 20 N/mmř after 28 days
ans- D
186. In order to achieve required workability and good strength at the same time, water cement ratio,
in case of machine mixing is
(a) 0.3-0.4
(b) 0.4-0.5
(c) 0.5-0.6
(d) none of the above
ans-B
187. In case of hand mixing in order to achieve good workability and good strength at the same time
(a) 0.3-0.4
(b} 0.4-0.5
(c) 0.5-0.6
(d) none of the above
ans- C
188. The weight and volume of one bag of cement respectively are
(a) 50 kg and 35 litres
(b) 60 kg and 30 litres
(c) 50 kg and 30 litres
(d) 60 kg and 35 litres
ans- A
189. If the water cement ratio to be used is 0.5, then water to be added to one bag of cement is
(a) 30 kg
(b) 25 kg
(c) 20 kg
(d)1 18 kg
ans- B
190. In machine mixing of concrete, the drum is rotated to make about
(a) 35 rotations
(b) S0 rotations
(c) 65 rotations
(d) 80 rotations
ans- B
191. For transporting concrete which one of the following is not used?
(a) pans
(b) chutes
(C) belt conveyor
(d) tractor
ans- D
192. Concrete should not be placed by droping at a height more than
(a) 400 mm
(b) 600 mm
(c) 800 mm
(d) 1000 mm
ans- c
193. Compaction of concrete is to
(a) remove entrapped air
(b) spread cement paste uniformly
(c) get level surface at top
(d) all of the above
ans- A
194. Curing of concrete is the process of
(a) keeping the surrounding cool
(b) ponding the water on the surface
(c) covering the surfäce with wet gunny bags
(d) maintaining satisfactory moisture'aridk tenmperamire' for awspeeific time
ans- D
195. In precast industries, best method of curing is
(a) ponding
(6) covering with wet gunny bags
(C) spraying water
(d) steam curing
ans- D
196. Curing compound mainly consists of
(a) calcium hydroxide
(b) calcium oxide
(c) chlorinated rubber
(d) calcium nitrate
ans-C
197. Workability of concrete depends on
(a) water content
(b) aggregate shape and size
(C)mix proportion
(d) all the above
ans- D
198. Which one of the following yields more workable concrete?
(a) Bigger size aggregates with rounded shape.
(b) Bigger size aggregates with angular shape.
(c) Smaller size aggregates with rounded shape.
(d) Smaller size aggregates with angular shape.
ans- A
199. Which one of the following mix has higher workability?
Repr lnnovtons
(a) Well graded aggregate with richer mix.
(b) Well graded aggregate with poorer mix.
(c) Uniform grade aggregate with rich mix.
(d) Uniform grade aggregate with poor mix.
ans- A
200. Workability of concrete is determined by
(a) slump test
(6) compaction factor test
(c) Vee-Bee test
(d) all the above
ans- D
201. Slump required for concreting lightly reinforced sections without vibration is
(a) up to 25 mm
(b) 25- 75 mm
(c) 25- 10 mm
(d) more than 100 mm
ans- B
202. Slump required tor concreting heavily reinforced sections without vibration is
(a) up to 25 mm
(b) 25-50 mm
(c) 50-75 mm
(d) 75-125 mm
ans-D
203. For concreting heavily reinforced sections without vibrations, compaction factor should be
(a) 0.75- 0.80
(6) 0.80- 0.85
(c) 0.85-0.92
(d) more than 0.92
ans-D
204. Vee-Bee consistometer test is suitable for finding workability of
(a) rich conerete
(6) lean concrete
(c) stiff concrete
(d) all the above
ans-c
205. Segregation is due to
(a) lack of sufficient quantity of fine aggregates
(b) dropping concrete from a greater height
(C) over vibration
(d) all the above
ans-D
206. Bleeding of freshly laid concrete means
(a) segregation of conerete
(b) voids appearing on the surfäce
(c) appearance of water along with cement paste on the surtace
(d) all the above
ans- C
207. The ratio of strength of concrete after 1 year to that at 28 days is
(a) 0.9
(b) 1.0
(C)1.1
Education, Repr
vatin
(d) 1.2
ans- D
208. On cylindrical specimen, split test is conducted to determine
(a) compressive strength of conerete
(b) tensile strength
(c) flexural strength
(d) all the above
ans- B
209. Indian Standards specifications for estimating tensile strength and modulus of elasticity of
concrete, if characteristic strength/ck 1S known, are respectively
(a) 0.75
(b) 0.7
and 7000
and 5000
(c) 0.75fck and 7000 ck
(d) 0.7fck and S000fck
ans- B
210. Creep is permanent change in dimensibinstdue"t
(a) temperature variation
(b) whethering action caused by moisture in the air
(c) sustained load
(d) all the above
ans-C
211. Creep cocflicient of concrete depends upon
(a) stress in concrete
(b) the age of concrete at the time of loading
(c) duration of loading
(d) all the above
ans- D
212. Cocfficient of thermal expansion is highest in
(a) quartzite
(b) sandstone
(C) granitec
(d) basalt
ans- A
213. Which one of the following is not workability enhancing agent?
(a) air entraining agents
(b) plasticizer
(C) super plasticizer
(d) silica fium
ans- D
214, Which one of the following is not a construction chemical?
(a) silica fume
(b) bonding agents
(c) curing compound
(d) none of the above
Innovatin
ans- A
215. Which one of the following is not a light-weight concrete?
(a) aerated concrete
(b) no fine concrele
(c) polymer concrete
(d) foamed slag concrete
ans- D
216. Concrete mix design is intended to
(a) achieve specified characteristic strength
(b) achieve required workability
(c) achieve impermeability
(d) both (a) and (b)
ans- D
217. Minimum cement content for moderate exposure with normal weight aggregates of size 20 mm in
concrete is
(a) 280 kg/m
(b) 300 kg/m
(c) 320 kg/m
(d) 340 kg/m
ans-D
218. Fibre reinforced concrete is used in
(a) wearing coat of roads
(6) pipes, manhole covers
(c) door and window Irames
(d) all the abov
ans- B
219. Which one of the following is not correct about the use of ferrocement?
(a) for doors and window shutters
(6) domestic water tanks
(c) furnitures
d) beam and columns
ans- B
220. The ingredient of paint which gives it the binding property and form opaque coating is
(a)
(b) vehicle
(c) solvent
(d)f tiller
ans- c
221. The ingredient of paint that holds the ingredients in liquid suspension and allows them to be
applied on the surface is:
(a) base
(b) vehicle
(c) solvent
d) filler
ans- B
222. The ingredient of paint that increases coverage area and makes application easy is
(a) base
(b) vehicle
(C) solvent
ducation,
(d) filler
ans-C
223. The ingredient of paint that reduces the cost and increases durability is
(a) base
(b) vehicle
(c) solvent
(d) filler
ans- D
224. The cheap ingredient of a paint is
base
(a)
(b) vehicle
(c) filler
(d) solvent
ans- C
225. The presence of dampness while applying the primer affects the lifë of
(a) oil paint
(b) enamel paint
(c) alumimum paint
(d) plastic paint
ans-A
226. Commonly used base for paint is
(a) iron oxide
(b) red lead
(C)titanium white
(d) any one of the above
ans- D
227. Commonly used vehicle in paint is
(a) linseed o
(b) poppy oil
(c) nut oil1
(d) any one of the above
ans-A
228. Commonly used solvent in paint is
(a) white lead
(b) turpentine
(C) linseed oil
(d) any of the above
ans-b
229. Commonly used inert extenders used in paint is
(a) magnesia
(b) alumina
(c) charcoal
(d) any one of the above
ans-D
230. Enamel paint is prepared by adding white lead or zine to
nnovauDBS
(a) varnish
(b) polysterene
(c) spirit
(d) to any one of the above
ans-A
231. The surface of which paint can be cleaned by washing with water?
(a) oil paint
(b) enamel paint
(c) emulsion paint
(d) bituminous paint
ans-C
232. The paint which shines and is visible even in darkness is
(a) synthetic rubber paint
(b) cellulose paint
(c) aluminium paint
(d) emalsion paint
ans-C
233. Which paint is ideally suited törget datipproof Serfaeegesing.
(a) plastic paint
(b) asbestos paint
(c) synthetic rubber paint
(d) aluminium rubber paint
ans-B
234. The base material for distemper is
(a) iron oxide
(b) lithopone
(c) chalk
(d)lime
ans- c
235. The solvent used in cement paint is
lime
(a) spirit
(6) water
(c) turpentine
(d) napth
ans- B
236. Paint with white lead base is suitable for painting
(a) concrete surfaces
(b) walls
(C) woodwork
(d) iron work
ans- D
237. Painting work is generally specitied by
(a) weight of the paint used
(6) volume of the paint used
(c) labour used for painting
(d) area of the painted surface
ans-D
238. The small areas on painted surface encloscd by hair line cracks are known as
(a) blistering
(b) crazing
(c) wrinkling
(d) chalkingg
ans-c
239. Varnish is generally made of
(a) spirit
(b) solvent
(c) )resin
(d) both (b) and (e)
ans- D
240. In the fractional distillation of crude oil the components of crude which do not evaporate is
(a) kerosene
(b) spirit
(c) bitunen
(d) fuel oil
ans-C
241. Select correct option about bitumen
(a) Iis components are carbon, hydrogen and oxygen.
(6) It becomes soft at 30° to 100°C.
(c) It is susceptible to oxidation, forming blisters and cracks
(d) All the above.
ans-D
242. Cut back bitumen is produced by adding
(a) gasolin
(b) kerosene
(c) high boiling point light oil
(d) any of the above
ans-D
243. Asphalt is obtained by adding
(a) kerosene
(b) gasolin
(c) sand
(d) any of the above
ans-c
244. Tar is obtaincd by destructive distillation of
(a) coal
(b) wood
(c) mineral tar
(d) any one of the above
ans-B
245. At 30°C asphalt is available in the state of
(a) solid or semisolid
(b) solid
(c) viscous
(d) any of the above
. Reprise InnoVatoas
ans-B
246. Adhesive power is highest in case of
(a) asphalt
(b) bitumen
(c) cold tar
(d) none of the above
ans-c
247. Main constituent of glass is
(a) alumina
(b) silica
(c) acrylic
(d) none of the above
ans-B
248. Molten glass can be fabricated by
(a) blowing
(b) drawing
(c) casting
(d) any of the above
ans-D
249. Anealing the glass is the process of
(a) blowing and drawing
(b) drawing and casting
(c) heating and slow cooling
(d) any of the above
ans-c
250. Tempering the glass is the process of
(a) giving requisite degree of hardness
(b) making it impervious to light
(c) a method of fabrication
(d) none of the above
ans_-A
251. The glass used as Windowpanes and laboratory tables is
(a) soda lime glass
(b) polash lime glass
(c) polash lead glass
(d) common glass
ans-A
252. The glass used for making artificial gem is
(a) soda lime glass
(b) potash lime glass
(c) potash lime glass
(d) coloured glass
ans-c
253. Wired glass is used for
(a) telephone communication
(b) medicine bottles
(c) fire resistant doors
(d) artificial gems
ans- c
Education, Reprise Innovatin
254. Bulletproof glass has
(a) a number of layers all of same thickness
(b) outer layers thinner than inner layers
(c) outer layers thicker than inner layers
(d) inner layers with steel wire
ans- B
255. Shielding glass contains
(a) steel wires
(b) fibre glass
(c) lead oxide
(d) chrome
ans - C
256. Structured glass is
(a) usually coloured
b) mirrored
(c) heat resistant
(d) all the above
ans- D
257. Polymerization is the process of
(a) combine monomers to form a large chain-like molecule
(b) combine monomers to form a small chain-like molecule
(c) Break a polymer into a number of small monomers
(d) Break a polymer to form into a number of long monomers
ans- A
258. Phenol formaldehyde is produced by
(a) addition polymerization
(6) condensation polymerization
(C) copolymerization
(d) any of the above
ans- C
259. Which is wrong statement about thermosetti ng plastics?
(a) Undergo chemical changes at 127-177°C.
(b) Reheating will solen them
(c) If heated to 340° C charring takes place.
(d) Soluble in alcohol.
ans- B
260. Which one of the lollowing is correct statement about thermo plastics?
(a) Soften on heating and hardens on cooling.
(b) The process of hardening and soliening may be repeated any number of tümes
(c) Scrap obained from old article can be reused by sofening and reshaping
(d) All the above.
ans-D
261. Fibre reinforced plastics are manufactured by reinforcing plastic with
(a) paper
(b) asbestos
(c) glass
(d) any of the above
rise Educatinn, Reprise lnnovatinns
ans- D
262. Cork is obtained from
(a) bark of oak tree
(b) destructive distillation of wood
(c) mines
(d) any of the above sources
ans- A
263. Vulcanization of rubber is to
(a) purify rubber
(b) toughen rubber
(c) make it soft
(d) all the above
ans- B
264. Gypsum boards are manufactured by mixing gypsum with
(a) tar
(b) bitumin
(c) asphalt
(d) rubber
ans- c
265. Turpentine is a natural material obtained from
(a) oak trees
(b) pine rees
(c) mines
(d) any of the above
ans- B
266. Which one is the correct statement about geosynthetics?
(a) They are fabrics of nylon.
(b) They last long even ifthey are buried under soil.
(c) They are not allected by water.
(d) All the above.
ans- D
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