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Q.1
TLV of aldrin in public water supply system is about __________ μg/litre.
0.5
17
357
1097
Q.2
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.
5
500
1000
2000
Q.3
In sewage treatment, its sedimentation is speeded up by commonly adding
Hydrochloric acid
Lime
Copper sulphate
Sodium sulphate
Q.4
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).
50
1000
2000
5000
Q.5
Out of the following, TLV of __________ is maximum (about 500 ppm).
Carbon dioxide
Toluene
Carbon disulphide
Acetaldehyde
Q.6
The lowest layer of atmosphere is known as the
Stratosphere
Troposphere
Ionosphere
None of these
Q.7
__________ is the process of killing organism in water.
Coagulation
Sterilisation
Disinfection
Sedimentation
Q.8
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
20
60
90
120
Q.9
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
60
90
105
120
Q.10
In a sedimentation tank, the detention period for water ranges from __________ hours.
2 to 4
8 to 12
16 to 20
24 to 32
Q.11
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
1 to 2
4 to 5
9 to 10
15 to 20
Q.12
Presence of high concentration of ozone and smog in atmospheric air causes the
Embrittlement & decrease of folding resistance of paper
Cracking of rubber products
Fading of dye on textiles
Damage of electrical insulator on high tension power line
Q.13
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause
Explosion
Non biodegradable foam
Undesirable plant growth
Corrosion
Q.14
Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
Phosgene
Bromine
MIC (methyl iso-cynate)
Ozone
Q.15
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
Reduce SO₂ content in
Catalytically convert SO₂ to SO₃ in
Increase the dew point of
None of these
Q.16
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.
90
120
150
180
Q.17
Operating principle of cyclone separator is based on the action of __________ dust particles.
Diffusion of
Centrifugal force on
Gravitational force on
Electrostatic force on
Q.18
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
Low amount of excess combustion air
Large quantity of excess combustion air
Hydrocarbon fuel
Pulverised coal as fuel
Q.19
A standard test for determination of hardness in water is termed as __________ test.
EDTA
Electometric
Total count
Presumptive
Q.20
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
Radioactive
Organic
Inorganic
None of these
Q.21
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
Thermosphere
Stratosphere
Troposphere
Mesosphere
Q.22
Most of the bacteria in sewage are
Parasitic
Saprophytic
Anerobic
None of these
Q.23
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
Calcium
Fluorine
Phosphorous
Sulphur
Q.24
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
85
105
125
145
Q.25
Noise level inside a jet air liner in normal flight is about __________ decibels.
80
100
125
145
Q.26
Which of the following is an adsorbant used for the removal of SO₂ from gas/air?
Bog iron
Limestone powder or alkalised alumina
Silica gel
Active carbon
Q.27
Turbidity of water is an indication of the presence of
Suspended inorganic matter
Dissolved solids
Floating solids
Dissolved gases
Q.28
Pick out the wrong statement.
The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone
Mesosphere is characterised by very low atmospheric pressure and low temperature
Troposhere is a dusty zone containing water vapor and clouds
The radio waves used in the long distance radio communication are reflected back to earth by stratosphere
Q.29
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
105
135
160
185
Q.30
Presence of iron and manganese in water causes
Reduction in its dissolved oxygen content
Discoloration of bathroom fixtures
Temporary hardness
None of these
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