Unit - 6
151. Which of the following is a control measure of removal of colour, taste and order?
a. Copper sulphate treatment
b. Silver treatment
c. Ozone treatment
d. Use of chloramines
152. Aeration is effective in removing of odours.
a. 75%
b. 70%
c. 77%
d. 73%
153. Which of the following process is also known as Ion exchange process?
a. Lime soda process
b. Base exchange process
c. Cation exchange process
d. Demineralization process
154. The dosage of ozone is about ppm residual ozone.
a. 2 to 3 ppm
b. 2 to 4 ppm
c. 1 to 3 ppm
d. zero
155. What is the uniformity coefficient of sand used in the rapid sand filter?
a. 6.3
b. 14.2
c. 1.75
d. 6.5
156. The efficiency of slow sand filter is about _
a. 93%
b. 95%
c. 99%
d. 97%
158. The sand used for filtration should not lose weight more than
when placed in Hcl for 24 hours.
a. 25%
b. 10%
c. 5%
d. 20%
159. Column is a tension member.
a. False
b. True
157. Cleaning period of slow sand filter is taken as
a. 1 to 3 weeks
b. 1 to 3 days
c. 1 to 3 months
d. 1 to 2 hours
160. The organic impurities in the water from a layer on the top of a filtering media are called dirty skin.
a. True
b. False
161. The rate of filtration in slow sand filter is
a. 100 to 200 lit/hr/m2
b. 250 to 350 lit/hr/m2
c. 150 to 200 lit/hr/m2
d. 100 to 150 lit/hr/m2
162. The process of removing chlorine from water is known as
a. Re chlorination
b. De chlorination
c. Pre chlorination
d. Post chlorination
164. The formula d=a×√(3q)/m is used to calculate depth of concrete bed block.
a. True
b. False
165. Normally, the footing are so designed and proportion that the centre of gravity of the superimposed load coincides with the CG of the base area, so that the footing is subjected to concentric loading, resulting in uniform bearing pressure. However, it may not be possible to do so and hence eccentric loading footings are applied.
a. True
b. False
166. A strip footing is the one that provides a continuous longitudinal bearing. Thus, a spread footing for a continuous wall is called a strip footing.
a. True
b. False
167. The grillage Foundation is a special type of isolated footing, generally provided for heavily loaded steel, specially in those location where bearing capacity of soil is poor.
a. True
b. False
a. Strut
b. Stanchion
c. Pillar
d. Post
169. The inclined member carrying compressive loads is _
a. Post
b. Strut
c. Column
d. Stanchion
170. is a vertical member subjected to direct compressive force.
a. Post
b. Column
c. Strut
d. Stanchion
171. Which type of footing is applicable when the wall carries light loads or when the safe bearing pressure is very high?
a. Stepped footing
b. Simple strip footing
c. Simple pad footing
d. Eccentric footing
172. The shape of the combined footing should be so selected that the centres of gravity of the column loads of soil reaction remains in the same vertical line. Usually a rectangular or a trapezoidal shape is selected.
a. True
b. False
173. A spread footing for a single column is either known as the isolated footing or pad footing. The base area of such a footing is given by A = P/q where P is the total load transmitted by the column, including that of the footing and q is the safe bearing pressure for the soil.
a. True
b. False
174. Varignon’s theorem is called as _
a. Principle of points
b. Principle of moments
c. Theory of couple
d. Principle of Forces
175. Which of the following is also known as a ring system?
a. Reticulation
b. Circle
c. Radial
d. Interlaced
176. Which of the following system is also known as an interlaced system?
a. Circle system
b. Tree system
c. Grid iron system
d. Radial system
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