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Environmental Engineering in CE

Environmental Engineering in CE
Most of the bacteria in sewage are

Parasitic
None of these
Saprophytic
Anerobic

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Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

1
7
82
19

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Environmental Engineering in CE
Which of the following is the most lethal water pollutant?

Suspended solids
Chlorine
Alkalis
Phenol and cynide

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Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Alum (aluminium sulphate)
Lime
Sodium aluminate
Ferric chloride

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Environmental Engineering in CE
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.

10⁵
10²
10⁹
10¹⁵

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Environmental Engineering in CE
Carbon monoxide is a pollutant, which causes

Asphyxiation (suffocation) leading to death
Respiratory disease (e.g. asthma)
Retardation in crop growth
Damage to building materials like marble

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