Related Questions

The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
A 0.01 to 0.05 ppm
B 0.05 to 0.5 ppm
C 0.5 to 1.0 ppm
D 1.0 to 5.0 ppm
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
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
The permissible color for domestic water supply is __________ ppm.
A 1
B 20
C 100
D 1000
Scheme-1: C6H5N2Cl→CuCNC6H5CN→H2o/H+C6H5COOH→∆Product-I Scheme-2: C6H5NO2→Fe/HCLC6H5NH2→N2NO3+HCL, 273KC6H5N2Cl→H2O/H+Product-II Scheme-3: CH3COOH→NH3CH3CONH2→NaOBrProduct-III উল্লিখিত Scheme সমূহে Product-I, Product-II এবং Product-III হলো যথাক্রমেঃ
A C6H5COONH4, C6H5Cl and CH3OH
B C6H5CONH2, C6H5NH2 and CH3OH
C C6H5CONH2, C6H5NH2 and CH3NH2
D C6H5CONH2, C6H5OH and CH3OH
TLV of lead for public sewer/waste water is about __________ ppm.
A 1
B 25
C 150
D 650
Dose of chlorine for disinfection of water is about __________ mg/litre of water.
A 0.01
B 0.1
C 0.3
D 1
For whom a dosage of two teaspoonfuls be recommended?
A A 10-14 year old child
B A 6-+9 year old child
C A 3-5 year old child
D An adult
Sea water contains about __________ ppm of bromine.
A 5
B 70
C 500
D 1700
Bromine content in sea water may be around __________ ppm.
A 70
B 640
C 1875
D 2500

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