Related Questions

Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
A 50
B 1000
C 5000
D 10000
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
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) of CO in air is __________ ppm.
A 5
B 50
C 2000
D 5000
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
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?
A Active carbon
B Silica gel
C Bog iron (iron oxide)
D Pulverised limestone
The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about __________ percent.
A 60
B 30
C 95
D 100
On Dhaka- Sylet highway , 5% of the drives are fined for exceeding the speed limit. However , 80% of the drivers who exceed the speed limit are not fined. What percentage of dirvers on this highway exceed the speed limit?
A 10
B 15
C 20
D 25
Often visible as smog , ozone is formed in the atmosphere form" hydrocarbons and nitrogen oxides , two major pollutants emitted by automobiles react with sunlight .
A ozone is formed in the atmosphere from
B ozone is formed in the atmosphere when
C ozone is formed in the atmosphere when
D ozone is formed in the atmosphere ,and when

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