Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.

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

Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.

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