95. Terracotta means
(a) insulated
(b) fit for sanitary services
(c) good for ornamental work
(d) baked earth
96. Water absorption of vitrified tiles is not more than
(a) 0.5%
(b) 1.0%
(c) 2.0%
(d) 5.0%
97. To make terracotta porous, the following is mixed with clay before burning.
(a) lime
(b) silica
(c) sawdust
(d) none of the above
Ferrous Materials
98. By calcining and smelting iron ores, a crude and impure form of iron obtained is known as
(a) cast iron
(b) wrought iron
(c) steel
(d) pig iron
99. The colour of cast iron is
(a) grey
(b) white
(c) both grey and white
(d) none of the above
100. The compressive and tensile strength of cast iron are
(a) 700 N/m2 and 150 N/mm2
(b) 600 N/mm2 and 400 N/mm2
(c) 415 N/mm2 and 415 N/mm2
(d) 400 N/mm2 and 600 N/mm2
.
101. For making spiral staircases, ideal material is
(a) pig iron
(b) cast iron
(c) wrought iron
(d) steel
102. Purest form of iron is
(a) pig iron
(b) cast iron
(c) wrought iron
(d) steel
103. Carbon content in wrought iron is
(a) 0.15%
(b) 0.25 to 1.5%
(c) 2 to 4%
(d) more than 4%
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
105. Ribs are made on steel wires to increase
(a) strength is compression
(b) strength is tension
(c) bond strength
(d) fatigue quality
106. The property of metal enabling it to be drawn into thin wire is known as
(a) malleability
(b) ductility
(c) toughness
(d) plasticity
107. The property of the metal enabling it to be transformed it into different shapes by heating is
a, b, c, d as per Question No. 106
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
110. The ore from which aluminium is extracted economically is
(a) kaolin
(b) kryolite
(c) corundum
(d) bauxite
111. Specific gravity of aluminium is
(a) 1.5
(b) 2.7
(c) 3.5
(d) 4.2
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
113. The heaviest metal is
(a) steel
(b) lead
(c) tin
(d) cast iron
114. Which of the following metal is poisonous?
(a) aluminium
(b) tin
(c) lead
(d) copper
Alloys
115. Duralumin is an alloy of
(a) aluminium and copper
(b) aluminium, copper, nickel and magnesium
(c) aluminium and zinc
(d) aluminium and tin
116. Which of the following is a variety of aluminium alloy
(a) duralumin
(b) aldural
(c) Y-alloy
(d) all the above
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
118. Which one of the following is not a variety of brass
(a) white brass
(b) yellow brass
(c) red brass
(d) brown brass
119. Bronze is an alloy of
(a) aluminium and copper
(b) copper and zinc
(c) copper and tin
(d) none of the above
120. The constituents of stainless steel are
(a) steel, chromium and nickel
(b) steel and nickel
(c) steel and manganese
(d) steel and molybdenum
121. Quick lime is
(a) calcium carbonate
(b) calcium oxide
(c) calcium hydroxide
(d) none of the above
122. When fat lime is slaked, its volume
(a) decreases to 50%
(b) remains same
(c) increases by 2 to 2.5 times
(d) increases by 4 times.
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
124. For plastering work lime used is
(a) quicklime
(b) fat lime
(c) hydraulic lime
(d) poor lime
125. Hydraulic lime is obtained by
(a) burning kankar
(b) calcination of limestone
(c) slaking quicklime
(c) silica
(d) carbon dioxide
134. The process of heating limestone to redness is termed as
(a) hydration
(b) carbonation
(c) oxidation
(d) calcination
135. The major constituent of cement is
(a) lime
(b) silica
(c) alumina
(d) iron oxide
136. The constituent which imparts strength to cement is
(a) lime
(b) silica
(c) alumina
(d) magnesia
137. The constituent which imparts colour to cement is
(a) lime
(b) silica
(c) alumina
(d) iron oxide
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
139. The clinker is formed at a temperature of
(a) 500–600° C
(b) 900–1000° C
(c) 1100–1300° C
(d) 1400–1500° C
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%
141. Gypsum is added in the manufacture of Portland cement to
(a) reduce setting time of cement
(b) increase setting time of cement
(c) to enhance the strength of cement
(d) to decrease grinding time
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
143. Specific surface of cement is
(a) measure of fineness
(b) measure of volume of cement
(c) measure of smoothness of cement
(d) none of the above
144. Specific surface of cement should not be less than
(a) 100 cm2
/gm
(b) 1500 cm2
/gm
(c) 2000 cm2
/gm
(d) 2250 cm2
/gm
145. Specification for setting time of ordinary Portland cement are:
Initial setting lime Final setting lime
(a) > 30 min > 600 min
(b) > 30 min < 600 min
(c) < 30 min < 600 min
(d) < 30 min > 600 min
146. The compound responsible for initial setting of cement is
(a) Tricalcium aluminate
(b) Tricalcium silicate
(c) Dicalcium silicate
(d) Tetra alumino ferrite
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.
148. The compound that hydrates slowly and responsible for gain of strength over a period of 1 year
is
a, b, c, d as per Question No. 146.
149. Unsoundness in cement is due to
(a) free lime
(b) free magnesia
(c) insufficient grinding
(d) all the above
150. Le Chatelier apparatus is used for testing cement for its
(a) strength
(b) setting time
(c) fineness
(d) soundness
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
152. 43-grade cement has a strength of 43 N/mm2 at the age of
(a) 3 days
(b) 7 days
(c) 28 days
(d) 1 year
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
154. Normal consistency of cement is about
(a) 7%
(b) 14%
(c) 21%
(d) 28%
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
156. Blast furnace slag cement is
(a) durable
(b) gains strength slowly
(c) cheap
(d) all the above
157. High alumina cement is
(a) more resistant to sulphate attack
(b) more resistant to acid attack
(c) gains almost full strength within 24 hours after adding water
(d) all the above
158. Which one of the following is not correct statement about fly ash blended cement?
(a) They have superior resistance to weathering action.
(b) They gain strength fast.
(c) Ultimate strength is same as OPC.
(d) All the above.
159. To prevent setting of cement during storage the material added to cement during grinding is
(a) acidol
(b) oleic acid
(c) oxidized petroleum
(d) any of the above
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
161. Which one of the following is the correct statement about quick setting cement?
Initial setting lime Final setting lime
(a) < 5 min < 30 min
(b) < 5 min > 30 min
(c) > 5 min < 30 min
(d) > 5 min < 30 min
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.
163. Identify the correct statement given below: The natural Pozzolanic material is/are
(a) clay
(b) shale
(c) volcanic sand
(d) all the above
164. Which one of the following is not a Pozzolanic material?
(a) fly ash
(b) rice husk ash
(c) gypsum
(d) blast furnace slag
165. Silica fumes have found their use in
(a) pumped concrete
(b) high strength concrete
(c) shutcrete application
(d) all the above
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
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
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
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
170. Due to bulking of sand, increase in volume is as high as
(a) 5%
(b) 15%
(c) 25%
(d) 30–40%
171. Maximum increase in the bulk of sand is at the moisture content
(a) 2 – 4%
(b) 4 – 6%
(c) 8 – 10%
(d) 12 – 15%
172. Bulking of sand is due to
(a) water films
(b) swelling of sand
(c) added mass of water
(d) none of the above
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.
174. The increase in volume of sand when water is added is known as
(a) segregation
(b) bleeding
(c) bulking
(d) honeycombing
175. The cement to dry sand proportion recommended for masonry work is
(a) 1 : 3
(b) 1 : 6
(c) 1 : 10
(d) 1 : 12
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
177. The cement to dry sand proportion recommended for plastering concrete surface is
(a) 1 : 3
(b) 1 : 6
(c) 1 : 8
(d) 1 : 10
178. The cement to dry sand proportion for pointing work is
(a) 1 : 2
(b) 1 : 4
(c) 1 : 6
(d) 1 : 8
179. The inert material to be used for making lime mortar is
(a) sand
(b) surkhi
(c) cinder
(d) any of the above
180. Gauged cement mortar consists of
(a) cement and sand
(b) cement, surkhi, sand
(c) cement, lime, sand
(d) cement, cinder, sand
181. Briquettes are the specimen of mortar used for finding
(a) compressive strength
(b) tensile strength
(c) flexural strength
(d) shear strength
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.
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.
184. Which one of the following statement is wrong? In the absence of mix design, the ingredients of
concrete are proportioned as
(a) 1 : 1 : 2 – mass concrete work
(b) 1 : 1 : 3 – water tanks
(c) 1 : 2 : 4 – slabs, beams
(d) 1 : 3 : 6 – sills of windows
185. M : 20 concrete means
(a) 1 : 2 : 4 concrete
(b) concrete with a strength of 20 kg/cm2 after 28 days
(c) concrete with a strength of 20 N/mm2 after 7 days
(d) concrete with a strength of 20 N/mm2 after 28 days
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
187. In case of hand mixing in order to achieve good workability and good strength at the same time
is
(a) 0.3 – 0.4
(b) 0.4 – 0.5
(c) 0.5 – 0.6
(d) none of the above
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
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) 18 kg
190. In machine mixing of concrete, the drum is rotated to make about
(a) 35 rotations
(b) 50 rotations
(c) 65 rotations
(d) 80 rotations
191. For transporting concrete which one of the following is not used?
(a) pans
(b) chutes
(c) belt conveyor
(d) tractor
192. Concrete should not be placed by dropping at a height more than
(a) 400 mm
(b) 600 mm
(c) 800 mm
(d) 1000 mm
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
194. Curing of concrete is the process of
(a) keeping the surrounding cool
(b) ponding the water on the surface
(c) covering the surface with wet gunny bags
(d) maintaining satisfactory moisture and temperature for a specific time
195. In precast industries, best method of curing is
(a) ponding
(b) covering with wet gunny bags
(c) spraying water
(d) steam curing
196. Curing compound mainly consists of
(a) calcium hydroxide
(b) calcium oxide
(c) chlorinated rubber
(d) calcium nitrate
197. Workability of concrete depends on
(a) water content
(b) aggregate shape and size
(c) mix proportion
(d) all the above
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.
199. Which one of the following mix has higher workability?
(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.
200. Workability of concrete is determined by
(a) slump test
(b) compaction factor test
(c) Vee-Bee test
(d) all the above
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