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Environmental Engineering in CE

Environmental Engineering in CE
Persons working in cement plants and limestone quarries are more prone to disease like

Flourosis (bone disease)
Asthma
Silicosis
Cancer

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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
10⁹
10¹⁵
10²

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Environmental Engineering in CE
The principal gas evolved from sludge digestion tank is

CO₂
CO
CH₄
N₂

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Environmental Engineering in CE
In water treatment, alum[Al2(SO₄)3] is used for the process of

Disinfection
Sedimentation
Coagulation
Filtration

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Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

105
75
35
95

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Environmental Engineering in CE
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

Ra-226
Au-198
I-131
Sr-90

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