5
Q:

Tertiary sewage treatment is designed to remove

A) Calcium and Phosphorous B) Nitrogen and Calcium
C) Phosphorous and Nitrogen D) Calcium and Nitrogen

Answer:   C) Phosphorous and Nitrogen



Explanation:

Sewage treatment generally involves three stages, called primary, secondary and tertiary treatment.

Primary treatment consists of temporarily holding the sewage in a quiescent basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface. This removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation.

 

Secondary treatment removes the soluble organic matter that escapes primary treatment. It also removes more of the suspended solids. Removal is usually accomplished by biological processes in which microbes consume the organic impurities as food, converting them into carbon dioxide, water, and energy for their own growth and reproduction.

tertiary_sewage_treatment_is_designed_to_remove1561617455.jpg image

 

Tertiary treatment includes removal of nutrients such as phosphorus and nitrogen and practically all suspended and organic matter from waste water.

 

tertiary_sewage_treatment_is_designed_to_remove_11561617483.jpg image

 

Subject: Chemistry
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Q:

Which of the following statement(s) is/are INCORRECT?

I. Alkenes are fairly unreactive.

II. Alkenes burn with blue flame.

III. Alkanes burn with yellow flame.

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: D) All I, II and III

Explanation:
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Q:

Atomic number is always equal to ______.

A) Number of protons B) Number of neutrons
C) Number of electrons D) Sum of protons and neutrons  
 
Answer & Explanation Answer: A) Number of protons

Explanation:
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Q:

Which process usually requires water?

A) Physical weathering B) Mass wasting
C) Chemical weathering D) Erosion
 
Answer & Explanation Answer: C) Chemical weathering

Explanation:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.

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1 23
Q:

In hydrolysis reactions compounds react with

A) carbon, causing decomposition B) glucose, causing decomposition
C) water, causing decomposition D) hydrogen, causing decomposition
 
Answer & Explanation Answer: C) water, causing decomposition

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Q:

The atoms of the elements having same difference between mass number and atomic number are called ______.

A) Isobar B) Isotopes
C) Isotones D) No option is correct
 
Answer & Explanation Answer: C) Isotones

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Q:

Electrons can be deflected by which of the following?

A) Only magnetic field B) Only electric field
C) Both magnetic and electric field D) No option is correct
 
Answer & Explanation Answer: C) Both magnetic and electric field

Explanation:
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1 55
Q:

Which of the following is a CORRECT statement?

A) Only compounds are pure substance B) Compounds are impure substance
C) Only elements are pure substance D) Both compounds and elements are pure substance
 
Answer & Explanation Answer: D) Both compounds and elements are pure substance

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Q:

Isobars are atoms of different chemical elements that have ______.

 

A) Same atomic number but different mass number B) Same mass number but different atomic number
C) Same mass number and same atomic number D) Different mass number and different atomic number  
 
Answer & Explanation Answer: B) Same mass number but different atomic number

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