Related Questions

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
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
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
A 5
B 100
C 1000
D 2000
TLV of lead for public sewer/waste water is about __________ ppm.
A 1
B 25
C 150
D 650
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
TLV of mercury in potable (drinking) water is about __________ ppm.
A 0.001
B 0.1
C 1
D 5
Tolerable limit of nitrogen oxides in air is __________ ppm.
A 0.1
B 1
C 5
D 25
Threshold limit value of copper in the atmospheric air is
A 0.001 mg/m3
B 0.01 mg/m3
C 1.0 mg/m3
D 5.0 mg/m3
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
TLV of aldrin in public water supply system is about __________ μg/litre.
A 0.5
B 17
C 357
D 1097

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