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AQA A LEVEL BIOLOGY Paper 3 MS 2021
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AQA A LEVEL BIOLOGY Paper 3 MS 
2021 
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MARK SCHEME – A-LEVEL BIOLOGY – 7402/3 – JUNE 2021 
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A-level 
BIOLOGY 
7402/3 
Paper 3 
Mark scheme 
June 2021 
Version: 1.0 Final 
2 
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Wastewater B Test Questions And 100% Correct Answers
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Wastewater B Test Questions And 100% Correct Answers 
Percent of volatile solids normally in sludge - Correct Answer 70-80% 
 
D.O. levels in a primary clarifier - Correct Answer 0.5-1.0 MG/L 
 
Why are precautionary measures needed around an aeration basin? - Correct Answer undertow and turbulence 
 
O.S.H.A. approved trench - Correct Answer narrow excavation in which the depth is greater than the width; the width must be less than 15 feet 
 
What causes bulking? - Correct Answer 1. Excess...
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FTCE Middle Grades Science 5-9 Exam 406 Questions with Verified Answers,100% CORRECT
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FTCE Middle Grades Science 5-9 Exam 406 Questions with Verified Answers 
 
Which of the properties listed below is a characteristic of a liquid but not of a gas? 
A. It has the ability to flow. 
B. It maintains its volume in an open container. 
C. Its molecules are constantly in motion. 
D. Its volume varies depending on temperature. - CORRECT ANSWER B 
 
A 0.100 m3 chamber is filled with oxygen gas at standard conditions (101 kPa at 273 k). Assuming ideal conditions and behavior, what will be t...
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Class C Waste water Operator License Exam Questions With Correct Answers
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The Activated Sludge Process: 
 
A. requires preaeration 
B. requires Activated Carbon 
C. is an aerobic biological process. 
D. Usually precedes primary sedimentation. 
E. Requires 50% by volume old sludge to work effectively. - Answer C. Is an Aerobic biological process 
 
A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One way to correct this problem is to : 
 
A. Increase the RAS Flow 
B. Reduce Wasting Rates 
C. Increase d...
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Wastewater Exam Class C Questions & Answers (SCORED A)
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The Activated Sludge Process: 
 
A. requires preaeration 
B. requires Activated Carbon 
C. is an aerobic biological process. 
D. Usually precedes primary sedimentation. 
E. Requires 50% by volume old sludge to work effectively. -ANSWER C. Is an Aerobic biological process 
 
A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One way to correct this problem is to : 
 
A. Increase the RAS Flow 
B. Reduce Wasting Rates 
C. Increase di...
-
WGU - C190 Latest Update with Certified Answers
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WGU - C190 Latest Update with Certified Answers Coevolution Event The process by which two or more species evolve in tandem by exerting selection pressures on each other 
Speciation Event A lineage-splitting event that produces two or more separate species. 
Phylogenetic Event The evolutionary development and history of a species or higher taxonomic grouping of organisms. Also called phylogenesis. The evolutionary development of an organ or other part of an organism 
Homology Event Shared trait ...
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Wastewater Operator Study Guide Module 1(Questions And Answers)2022/2023
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Which dangerous gas will be more likely to rise near the surface of a manhole? 
( A ) Hydrogen sulfide 
( B ) Methane 
( C ) Nitrogen 
( D ) None of the above 
B 
 
 
 
What type of pond has aerobic conditions near the top and anaerobic conditions at the bottom? 
( A ) Fully aerated 
( B ) Anaerobic digestion 
( C ) Fermentation 
( D ) Facultative 
D 
 
 
 
What is it called when all of the demand for chlorine has been satisfied? 
( A ) Breakpoint 
( B ) Combined 
( C ) Mono-chloramine 
( D ) Mo...
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Wastewater Exam Class C
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Wastewater Exam Class C 
The Activated Sludge Process: 
A. requires preaeration 
B. requires Activated Carbon 
C. is an aerobic biological process. 
D. Usually precedes primary sedimentation. 
E. Requires 50% by volume old sludge to work effectively. Ans- C. Is an Aerobic biological process 
A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the 
clarifier. One way to correct this problem is to : 
A. Increase the RAS Flow 
B. Reduce Wasting Rat...
-
Wastewater Exam Class C Questions and Answers Already Passed
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Wastewater Exam Class C Questions and Answers Already Passed 
The Activated Sludge Process: 
A. requires preaeration 
B. requires Activated Carbon 
C. is an aerobic biological process. 
D. Usually precedes primary sedimentation. E. Requires 50% by volume old sludge to work effectively. C. Is an Aerobic biological process 
A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One way to correct this problem is to : 
A. Increase the RA...
-
AQA A LEVEL BIOLOGY Paper 3 Mark Scheme
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AQA A LEVEL BIOLOGY Paper 3 MS 2021 
S - The Marketplace to Buy and Sell your Study Material 
Downloaded by: BetterAcademics | 
Distribution of this document is illegal 
S - The Marketplace to Buy and Sell your Study Material 
MARK SCHEME – A-LEVEL BIOLOGY – 7402/3 – JUNE 2021 
Downloaded by: BetterAcademics | 
Distribution of this document is illegal 
A-l...