Solved Paper Junior Engineer Environmental 2018 [Part-3] – HPSSC Hamirpur

111. Pyramid of numbers in a grassland/tree ecosystem is:

1. Always downward
2. Always upright
3. Equal in all direction
4. None of these

112. If we completely remove the decomposers from an ecosystem, its function will be adversely affected because:

1. Rate of decomposition will be very high.
2. Energy flow will be blocked
3. Mineral movement will be blocked
4. Herbivores will not receive sunlight

113. Greenhouse gas effect is caused by:

1. Only CO₂
2. CFC, CO₂, CH₄ and NO₂ gases
3. CFC, CO₂ and CH₄ only
4. Only (A) and (C)

114. The niche of a species is meant for:

1. Habitat and specific function of a species
2. Specific place where an organism lives
3. Specific species function and its competitive power.
4. None of these

115. Which of the following equations is not in conformity with others?

1. Organizations Performance * Motivations = Profits
2. Knowledge * Skills = Ability
3. Ability * Motivation = Performance
4. Attitude * Situation = Motivation

116. Which of the following is a pollution-related disorder?

1. Fluorosis
2. Silicosis
3. Leprosis
4. Pneumoconiosis

117. Biogas is:

1. Gas produced by fermentation of biomass
2. Gas produced by crude oil wells
3. Gas produced by incomplete combustion of biomass
4. Gas produced from volcanoes

118. The environment includes:

1. Abiotic
2. Biotic
3. Both (A) and (B)
4. Only (A)

119. Consider the following statements:

A psychrometer measures (1997)

1. wet bulb temperature
2. dew point temperature
3. dry bulb temperature

Correct code is:

1. 1 alone
2. 2 and 3
3. 1 and 3
4. 1, 2 and 3

120. A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg K to 0.4 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/kg K to 75 kJ/kg K. The process is:

1. Reversible and isothermal
2. Irreversible
3. Reversible only
4. Isothermal only

121. Imhoff cone is used to measure:

1. Dissolved solids
2. Suspended solids
3. Settleable solids
4. Total solids

122. Sludge bulking can be controlled by:

1. Chlorination
2. Coagulation
3. Aeration
4. Denitrification

123. The rim of a flywheel is subjected to:

1. Direct tensile stress and bending stress
2. Torsional shear stress and bending stress
3. Direct shear stress and bending stress
4. Compressive stress and bending stress

124. Match List – I with List- II and select the correct answer using the code given below the lists

List -I                                                                     List – II

1. Rails                                           1. Connect one section of rail to next
2. Sleepers                                     2. Convert line load into uniformly distributed load
3. Ballast                                        3. Convert point load into uniformly distributed load
4. Fish Plates                                4. Convert rolling loads into point load(s)

Code:

a              b             c              d

1. 4              3              2              1
2. 1              2              3              4
3. 4              2              3              1
4. 1              3              2              4

125. In the case of isolated square concrete footing, match the locations at which the stress resultants are to be checked, where d is effective depth of footing and select the correct answer using the codes given below the lists:

Stress resultant                                                   Location

1. Bending moment                                            1. At face of column
2. One-way shear                                                2. At d/2 from face of column
3. Punching shear                                               3. At d from face of column

Coding:

a              b            c

1. 1              2             3
2. 3              1             2
3. 2              1             3
4. 1              3             2

126. Which of the following is not a chemical property of sewage?

1. BOD
2. COD
3. TOC
4. Turbidity

127. The desirable camber for straight roads with water bound macadam surface is:

1. 1 in 33 to 1 in 25
2. 1 in 40 to 1 in 33
3. 1 in 40 to 1 in 50
4. None of these

128. If t_o, t_p and t_m are the optimistic, pessimistic and most likely time estimates of an activity respectively. the expected time t of the activity will be:

1. (t_o + 3t_m + t_p)/4
2. (t_o + 4t_m + t_p)/4
3. (t_o + 3t_m + t_p)/6
4. (t_o + 3t_m – t_p)/6

129. lf d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than:

1. d but not less than 0.20 d
2. 1.25 d but not less than 0.33 d
3. 1.5 d but not less than 0.33 d
4. 2.5 d but not less than 0.50 d

130. To avoid shearing, dam has to be placed as far as possible from:

1. Folds
2. Intrusions
3. Faults
4. Joints

131. The flow rate through circular pipe is measured by:

1. Pitot-tube
2. Venturimeter
3. Orifice meter
4. Both (B) and (C)

132. Euler’s number is a ratio of:

1. Inertia force to pressure force
2. Inertia force to gravity force
3. Inertia force to elastic force
4. None of these

133. If the Froude number in open channel flow is one, then flow is called:

1. Streaming flow
2. Critical flow
3. Shooting flow
4. None of these

134. Which mouthpiece is having the maximum coefficient of discharge?

1. Convergent-divergent mouthpiece
2. External mouthpiece
3. Internal mouthpiece
4. (A) and (C) only

135. Triangular notch is preferred over rectangular notch because:

1. ventilation of triangular notch is required in triangular notch.
2. in case of triangular notch, only one reading is required for computation of discharge.
3. rectangular notch gives more accurate result for low discharges only.
4. None of these

136. In case of Hagen-Poiseuille formula, the loss of pressure head is inversely proportional to:

1. Length of pipe
2. Square of diameter of pipe
3. Square of average mean speed of fluid
4. None of these

137. A pipe carrying water having kinematic viscosity 0.01 stokes and shear stress developed is 4.9 N/mm3. If the average height of the irregularities projecting from the ground is 0.15mm then what will be the shear velocity?

1. 0.07 m/s
2. 0.05 m/s
3. 0.01 m/s
4. 0.04 m/s

138. Hydraulic gradient line is:

1. Pressure head line only
2. Pressure head plus datum head w.r.t. some reference line
3. Pressure head plus datum head plus kinetic head
4. Kinetic head plus pressure head only

139. Which one of the following is not a technique under predetermined motion time system?

1. Work factor
2. Stopwatch time study
3. MTM
4. Synthetic Data

140. Reciprocating pumps are:

1. Run at high speed.
2. Efficiency is low and require large floor area.
3. Meant for small discharge and high head.
4. Used for lifting more viscous fluids.

141. The main pollutant in waste water discharged from the petroleum refinery is oil. Free oil is removed by:

1. Trickling filters
2. Biological oxygen pond
3. Gravity separators with oil skimming devices
4. Aerated lagoons

142. Siderosis is a disease caused by the inhalation of dust of:

1. Iron
2. Sulphur
3. Nitrogen
4. Lead

143. Which of the following does not change during the phase transformation process like sublimation, melting and vaporization?

1. Entropy
2. Gibbs free energy
3. Internal energy
4. All of these

144. Direct conversion of chemical energy into electric energy is done in a:

1. Fuel cell
2. Magneto hydrodynamic generator
3. Fast breeder reactor
4. None of these

145. Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid at 1OO °C?

1. Monel
2. Stainless steel
3. Graphite
4. Kel-F and Teflon

146. A gas occupies a volume of 283 c.c at 10 °C. If it is heated at 20 °C at constant pressure, the new volume of gas will be:

1. 283 c.c
2. 293 c.c
3. 273 c.c
4. 303 c.c

147. Match List – I with List – II and select the correct answer using the codes given below the lists

List -I                                     List – II

1. CO                           1. Greenhouse effect
2. CO₂                              2. Acid rains
3. SO₂                          3. Acute toxicity
4. NO_x                              4. Ozone liberation at ground level

Coding:

a              b             c              d

1. 3              2              1              4
2. 2              3              4              1
3. 3             1              2              4
4. 4              1              2              3

148. The atmosphere extends up to a height of 10000 km. It is divided into the following four thermal layers:

1. Mesosphere
2. Stratosphere
3. Thermosphere
4. Troposphere

Choose the right answer:

1. 2, 4, 1, 3
2. 4, 2, 1, 3
3. 4, 2, 3, 1
4. 2, 4, 3, 1

149. Which of the following air pollutants is/are responsible for photochemical smog?

1. Oxides of nitrogen
2. Ozone
3. Unburnt hydrocarbons/Volatile organic compounds
4. Carbon monoxide

Select the correct answer using the codes given below

1. 1 only
2. 2, 3 and 4
3. 1, 3 and 4
4. 1 and 3

150. The length of a line measured with a 20 m chain was found to be 400 m. It was afterwards found that the chain was 0.05 m too long. What will be the true length of the line?

1. 399 m
2. 401 m
3. 4000.05 m
4. 399.05 m

151. Organisms that mineralize organic matter in an ecosystem are called:

1. Producers
2. Consumers
3. Decomposers
4. Carnivorous

152. Which type of plume may occur during winter nights?

1. Looping
2. Inversion
3. Coning
4. Lofting

153. Biological magnification of pesticides takes place through which of the following?

1. Population pyramids
2. Hydrologic cycle
3. Food chains
4. Air cycle

154. The major source of Carbon monoxide in the urban atmosphere is due to:

1. decomposition of organics
2. chemical reaction between VOC and NOX
3. incomplete combustion of fuel
4. incomplete combustion in the presence of sunlight

155. The principle involved in collection and sampling of particulate matter in which the particles are drawn through a device by deflecting them from their original paths is called:

1. Filtration
2. Electrostatic precipitation
3. Impaction
4. Gravitational settling

156. Which one of the following represents a group incentive plan?

1. Halsey Premium Plan
2. Rowan Plan
3. Lincoln Plan
4. Taylor Plan

157. Consider the following statements:

1. Noise pollution can be reduced using double-glass window panes.
2. Glass absorbs the noise.
3. The air trapped in the double-glass system acts as an insulator and reduces the noise.
4. The noise totally reflects back due to the two layers of glass.

Which of these statements are correct?

1. 1, 2, 3 and 4
2. 1, 2 and 3 only
3. 1 and 3 only
4. 2 and 4 only

158. What type of sound can be abated by providing lining on walls and ceiling with sound absorbing materials?

1. Source noise
2. Reflection noise
3. Structural noise
4. Direct air-borne noise

159. Consider the following statements pertaining to stability of floating bodies:

1. A floating body will be stable when the centre of grav1ty is above the centre of buoyancy.
2. The position of metacentres corresponding to different axes of rotation are generally different for the same floating object.
3. For cargo ships, the metacentric height varies with loading.

Which of the above statements are correct?

1. 1, 2 and 3
2. 1 and 2 only
3. 1 and 3 only
4. 2 and 3 only

160. The sewage of the town is to be discharged into a river stream. The quantity of sewage produced per day is 100 l/s and its B.O.D. is 250 mg/l. If the discharge in the river is 200 l/s and its B.O.D. is 6 mg/l, then what will be the B.O.D. of diluted water:

1. 87.1 mg/l
2. 87.33 mg/l
3. 87.61 mg/l
4. 87.80 mg/l

161. The lakes having medium productivity levels with medium growth of algae and turbidity are called:

1. Oligotrophic
2. Mesotrophic
3. Eutrophic
4. Senescent

162. The important secondary pollutants are:

1. Sulphuric acid
2. Ozone, PAN
3. Formaldehydes
4. All of these

163. With respect to electrostatic precipitator:

1. Particles may be collected wet or dry
2. Higher initial cost
3. Sensitive to various dust loading and flow rates
4. All of these

164. The following zones are formed in a polluted river:

1. Zone of clear water
2. Zone of active-decomposition
3. Zone of recovery
4. Zone of pollution

The correct sequence in which these zones occur progressively downstream in a polluted river is:

1. 4, 2, 1, 3
2. 2, 4, 3, 1
3. 2, 4, 1, 3
4. 2, 4, 3, 1

165. The elongation of a bar is 0.7 mm when a tensile stress of 150 N/mm² acts on it. What will be the original length of the bar if the modulus of elasticity of material is 150 N/mm²?

1. 70 mm
2. 7 mm
3. 700 mm
4. 0.7 mm

166. In sampling of stack gases for measurement of concentration of Suspended particulate matter (SPM), the flue gases are sucked in the instrument at

1. any rate of flow mid diameter of chimney
2. any point of chimney cross-section and at any rate of flow
3. controlled positions and controlled velocities along the chimney diameter to get isokinetic conditions
4. a constant rate of flow but at four equidistant points along the diameter

167. Match List-I (Parameters) with List-II (Units) and select the correct answer using the codes given below the lists:

List-I                      List-II

1. Turbidity               1. TON
2. Pathogen               2. TCU
3. Odour                    3. JTU
4. Colour                   4. MPN

Code:

a              b             c              d

1. 2              1              4              3
2. 3              1              4              3
3. 2              4              1              3
4. 3              4              1              2

168. The following data pertains to a sewage sample:

initial DO = 12 mg/l

Final DO = 3 mg/l

Dilution to 1%

The BOD of the given sample is

1. 8 mg/l
2. 9 mg/l
3. 90 mg/l
4. 900 mg/l

169. Which of the following does not belong to Bogue compounds?

1. Tri-calcium aluminate
2. Di-calcium silicate
3. Tetra-calcium alumino ferrate
4. Di-calcium aluminate

170. A rectangular beam of width 250 mm and depth 400 mm is subjected to a sheer force of 250 kN The maximum shear stress produced in the beam is

1. 3.75 MPa
2. 3.5 MPa
3. 5 MPa
4. 7.5 MPa

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