Lead acetate test in sewer manhole is done to test the presence of

If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

A

Hydrogen sulphide

B

Carbon dioxide

C

Methane

D

Oxygen

A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

A

Carbondioxide gas

B

Hydrogen sulphide gas

C

Methane gas

D

Petrol vapours

If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

A

Hydrogen sulphide

B

Carbon dioxide

C

Methane

D

Oxygen

The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are

A

2 & 1

B

11 & 2

C

2 & 2

D

1 & 1

A manhole is classified as shallow if its depth is between

A

0.4 to 0.5 m

B

0.5 to 0.7 m

C

0.7 to 0.9 m

D

0.9 to 1.20 m

A manhole is generally provided at each

A

Bend

B

Junction

C

Change of gradient

D

All the above

The inspection pit or chamber is a manhole provided in a base drainage system

A

At every change of direction

B

At every change of gradient

C

At every 30 m intervals

D

All the above

A drop manhole is provided if

A

A sewer drops from a height

B

A branch sewer joins the main sewer at higher level

C

A lamp is inserted to check obstruction

D

None of these

Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher

A

Ductility

B

Impact strength

C

Machinability

D

Melting point

TLV of lead for public sewer/waste water is about __________ ppm.

A

1

B

25

C

150

D

650

Lead acetate test in sewer manhole is done to test the presence of

Related Questions