Related Questions

TLV of mercury in potable (drinking) water is about __________ ppm.
A 0.001
B 0.1
C 1
D 5
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
A 0.002
B 0.2
C 1.2
D 4.8
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
A 1
B 5
C 50
D 500
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
A [

A.

B. 10-100

B 100-200
C 100-1000
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
A 1000 to 2000
B 3000 to 6000
C 6000 to 9000
D 10000 to 100000
The permissible color for domestic water supply is __________ ppm.
A 1
B 20
C 100
D 1000
Potable water means the water used for
A Fire-fighting
B Cooling
C Drinking
D Evaporation to produce steam
For classification of potable (drinking) water, we use a __________ filter.
A Gravity sand
B Plate and frame
C Vacuum leaf
D Rotary vacuum
শাকিলের প্রস্তুতকৃত দ্রবণের i. ppm একক হবে 40000 ppm ii. মধ্যে আরো 10 mL পানিযোগে সেমিমোেলারে পরিণত হবে iii. মধ্যে 6.02 × 1022 টি NaOH অণু রয়েছে নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
Drinking (potable) water treatment does not involve
A Coagulation
B Sedimentation
C Softening
D Disinfection

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