Civil Engineering Practice - Building Material & Const. - Question Bank - Set-6

If you are preparing for any competitive exams like UPSC IES, GATE, SSC JE, State PSC, etc. or want to check your knowledge about any particular subject of Civil Engineering then solving MCQ's can be the best option. In this way you can also know your weakness about particular section of the subject. 

MULTIPLE CHOICE QUESTIONS

Level - Beginner (Ideal for SSC JE, State PSC and other Small Level Exams

126. The slow setting cement will have higher percentage of

(a) Tri calcium aluminate

(b) Tri calcium silicate

(c) Gypsum

(d) Di-calcium silicate

 

127. Di-calcium silicate

(a) Hydrates rapidly

(b) Generates less heat of hydration

(c) Reacts with water only

(d) Hardens rapidly 

128. The time taken by di-calcium silicate constituent of cement to add to the strength is

(a) 10-12 hours

(b) 2-5 days

(c) 1-8 days

(d) 14-28 days

 

129. In quick setting cement the compound added is called

(a) Aluminium sulphate

(b) Gypsum

(c) Aluminium silicate

(d) Calcium sulphate

 

130. As per IS 269-1975, the initial setting time of Portland cement is

(a) 1/3 hour

(b) 1/2 hour

(c) 1 hour

(d) 5 hours

 

131. Consider the following statements:

More than 6% magnesium oxide by weight in cement results in

1. High early strength and high heat generation.

2. Less tendency towards volume change and formation of cracks

Which of these statements is/are correct?

(a) I only

(b) 2 only

(c) Neither 1 nor 2

(d) Both 1 and 2

 

132. Vicat's apparatus is used to determine the

(a) Initial setting time of cement

(b) Final setting time of cement

(c) Normal consistency of cement

(d) All of the above

 

133. Gypsum is added in cement

(a) After burning

(b) Before burning

(c) After grinding

(d) At the time of mixing of raw materials

 

134. Gypsum is added in cement to

(a) Increase its initial setting time

(b) Decrease its initial setting time

(c) Increase its compressive strength

(d) Increase its bound strength

 

135. The most suitable temperature for burning of cement in rotary kiln is

(a) 300°C to 400°C 36

(b) 900°C to 1100°C

(c) 1500°C to 1650°C

(d) 1800°C to 2000°C

 

136. The small lumps of cement evolved after burning are named as

(a) Clinkers

(b) Nodules

(c) Kankar

(d) All of the above are correct

 

137. Fineness of cement is measured in the units of

(a) Volume/mass

(b) Mass/volume

(c) Area/mass

(d) Mass/area

 

138. The residue on I.S. sieve No. 9 of ordinary portland cement should not exceed

(a) 5%

(b) 10%

(c) 20%

(d) 30%

 

139. If ordinary sand is used, then the compressive strength of ordinary portland cement after 3 days curing should not be less than

(a) 75 kg/cm²

(b) 115 kg/cm²

(c) 160 kg/cm²

(d) 175 kg/cm²

 

140. The residue on I.S. sieve No. 9 of rapid hardening cement should not exceed

(a) 5%

(b) 10%

(c) 20%

(d) 30%

 

141. In the foundation of abutments or dams most suitable cement is

(a) Ordinary portland cement

(b) Rapid hardening cement

(c) High alumina cement

(d) Low heat portland cement

 

142. While preparing mortar, the binding material generally used is cement and

(a) Lime

(b) Cinder

(c) Surkhi

(d) Fly ash

 

143. While preparing lime mortar, generally inert material used is

(a) Stone powder

(b) Pit sand

(c) River sand

(d) Brick powder

 

144. Consider the following statements:

Sand in cement mortar is used for

1. Increasing the strength

2. Reducing the shrinkage

3. Decreasing the surface area of the binding material

4. Decreasing the quantity of cement

Which of these statements are correct?

(a) 1, 2 and 4

(b) 1, 2 and 3

(c) 1, 3 and 4

(d) 2, 3, and 4

 

145. Separation of water from the fresh concrete is called

(a) Segregation

(b) Bleeding

(c) Hydration

(d) Seepage

 

146. The strength of cement concrete depends on

(a) Water cement ratio

(b) Quality of water

(c) Quantity of aggregate

(d) Quality of cement

 

147. Consider the following statements:

1. The crushing strength of concrete is fully governed by water-cement ratio.

2. Vibration has no effect on strength of concrete at high water-cement ratios.

3. Workability of concrete is affected by improper grading of aggregates.

Which of the statements is/are correct?

(a) 1, 2 and 3

(b) 2 and 3 only

(c) 2 only

(d) 3 only

 

148. The minimum water cement ratio required for making concrete workable is

(a) 0,4

(b) 0.5

(c) 0.6

(d) 0.8

 

149. Portland cement is manufactured by burning in a Kiln the following materials

(a) Limestones and alumina

(b) Limestone and clay

(c) Limestone and sand

(d) Lime and clay

 

150. Grading of aggregate in a concrete mix is necessary to achieve

(a) Adequate workability

(b) Higher density

(c) Reduction in voids

(d) Better durability

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• Civil Engineering Practice - Building Material & Const. - Question Bank - Set-1
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• Civil Engineering Practice - Building Material & Const. - Question Bank - Set-5