The self cleansing velocity for all sewers in India is usually

With self cleansing velocity in sewers

A

Silting occurs at bottom

B

Scouring occurs at bottom

C

Both silting and scouring occur at bottom

D

Neither silting nor scouring occurs at bottom

In sewers designed with self cleansing velocity,

A

The bottom is silted

B

The bottom is scoured

C

Both silting and scouring occur at the bottom

D

Neither silting nor scouring occurs at the bottom

The effect of increasing diameter of sewer on the self cleansing velocity is

A

To decrease it

B

To increase it

C

Fluctuating

D

Nil

Self-cleansing velocity is

A

Velocity at dry weather flow

B

Velocity of water at flushing

C

Velocity at which no accumulation remains in the drains

D

Velocity of water in a pressure filter

The self-cleansing velocity of water flowing through pipe lines, is

A

2 metres/sec

B

1 metre/sec

C

0.5 metre/sec

D

0.25 metre/sec

Laying of sewers is usually done with the help of

A

A Theodolite

B

A compass

C

Sight rails and boning rods

D

A plane table

Cement concrete sewers are only suitable if non-scouring velocity is between

A

2.5 to 3.0 m/sec

B

3.0 to 4.0 m/sec

C

3.5 to 4.5 m/sec

D

4.5 to 5.5 m/sec

In sewers the velocity of flow should not be

A

More than the self-cleansing velocity

B

Less than the self-cleansing velocity

C

Less than 10 m/sec

D

More than 20 m/sec

In sewers the highest non-scouring velocity is achieved in

A

Glazed bricks sewers

B

Cast iron sewers

C

Cement concrete sewers

D

Stone ware sewers

The recent mass killings and atrocities of Rohingya Muslims in Myanmar was described as a 'text book example of ethnic cleansing' by :

A

Turkey's President Recep Tayyip Erdogan.

B

UN High Commissioner for Refugees.

C

UN High Commissioner for Human Rights .

D

Un Secretary General.

The self cleansing velocity for all sewers in India is usually

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