Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem New 2141302 Environmental Sciences Ii Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2141302 Date:05/12/2018
Subject Name:Environmental Sciences II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a)
State the Principle of Schulze-Hardy rule. Discuss it?s significance in wastewater
treatment.
03
(b) In a BOD determination, 6 ml of wastewater are mixed with 294 ml of diluting
water containing 9.1 mg/L of dissolved oxygen. After a 5-d incubation at 20?C,
the dissolved oxygen content of the mixture is 2.8 mg/L. Calculate the BOD
of the wastewater. Assume that the initial dissolved oxygen of wastewater is
zero.
04
(c)
Define and Differentiate between BOD and COD.
07
(U/A)
Q.2 (a) Explain the Principle of Osmosis and Reverse Osmosis with neat sketch. 03
(b) Derive the equation for Ultimate BOD. 04
(c) Enlist the reagents are used in determination of COD. Highlight the importance
of each along with reaction chemistry.
07
OR
(c) Discuss the significance of DO in wastewater treatment. Explain the modified
Winkler method with reaction chemistry.
07
Q.3 (a) Define the following terms: i. Sol ii. Smog iii. Emulsion 03
(b) i. In determination of phenolphthalein acidity color change appears from ____
to ____at ___ pH.
ii. Which organic substances are not oxidized in COD test?
iii. Which chemical is used to eliminate the interference caused by
nitrifying bacteria in BOD?
iv. Write the end point color change in titration of Sulphate and COD
analysis.
04
(c)
Determine the theoretical COD of the following compounds in mg/L in wastewater
sample: (i) 2500 mg/L of Acetic Acid (ii) 500 mg/L of Glucose
07
OR
Q.3 (a)
Define Primary Alcohol, Secondary Alcohol, Tertiary Alcohol with example.
03
(b) Enlist and Explain different types of Acidity. Highlight their Environmental
Significance.
04
(c) Calculate the % saturation of DO in water sample with a temperature of 22?C
and a DO concentration of 5.3 mg/L when the atmospheric pressure is 1 atm.
Assume the sample salinity is less than 100 mg/L.
07
Q.4 (a)
Explain kinetic approach of Chemical Equilibrium.
03
(b) Explain procedure to measure oil & Grease by solvent extraction method. 04
(c)
Enlist the General Properties of colloid. Explain the following Properties in detail (i)
Tyndall effect (ii) Brownian movement
07
OR
Q.4 (a)
Discuss the Significance of Colloids in Environmental Engineering.
03
(b) Briefly describe the Environmental Significance of Sulphates. 04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2141302 Date:05/12/2018
Subject Name:Environmental Sciences II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a)
State the Principle of Schulze-Hardy rule. Discuss it?s significance in wastewater
treatment.
03
(b) In a BOD determination, 6 ml of wastewater are mixed with 294 ml of diluting
water containing 9.1 mg/L of dissolved oxygen. After a 5-d incubation at 20?C,
the dissolved oxygen content of the mixture is 2.8 mg/L. Calculate the BOD
of the wastewater. Assume that the initial dissolved oxygen of wastewater is
zero.
04
(c)
Define and Differentiate between BOD and COD.
07
(U/A)
Q.2 (a) Explain the Principle of Osmosis and Reverse Osmosis with neat sketch. 03
(b) Derive the equation for Ultimate BOD. 04
(c) Enlist the reagents are used in determination of COD. Highlight the importance
of each along with reaction chemistry.
07
OR
(c) Discuss the significance of DO in wastewater treatment. Explain the modified
Winkler method with reaction chemistry.
07
Q.3 (a) Define the following terms: i. Sol ii. Smog iii. Emulsion 03
(b) i. In determination of phenolphthalein acidity color change appears from ____
to ____at ___ pH.
ii. Which organic substances are not oxidized in COD test?
iii. Which chemical is used to eliminate the interference caused by
nitrifying bacteria in BOD?
iv. Write the end point color change in titration of Sulphate and COD
analysis.
04
(c)
Determine the theoretical COD of the following compounds in mg/L in wastewater
sample: (i) 2500 mg/L of Acetic Acid (ii) 500 mg/L of Glucose
07
OR
Q.3 (a)
Define Primary Alcohol, Secondary Alcohol, Tertiary Alcohol with example.
03
(b) Enlist and Explain different types of Acidity. Highlight their Environmental
Significance.
04
(c) Calculate the % saturation of DO in water sample with a temperature of 22?C
and a DO concentration of 5.3 mg/L when the atmospheric pressure is 1 atm.
Assume the sample salinity is less than 100 mg/L.
07
Q.4 (a)
Explain kinetic approach of Chemical Equilibrium.
03
(b) Explain procedure to measure oil & Grease by solvent extraction method. 04
(c)
Enlist the General Properties of colloid. Explain the following Properties in detail (i)
Tyndall effect (ii) Brownian movement
07
OR
Q.4 (a)
Discuss the Significance of Colloids in Environmental Engineering.
03
(b) Briefly describe the Environmental Significance of Sulphates. 04
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2
(c)
Discuss Environmental Significance of Nitrogen. Explain Kjeldahl method for
Nitrogen estimation in detail.
07
Q.5 (a) Why incubation period is fixed for 5 days at 20 ?C in BOD test as per the
Standard method.
03
(b) Compare the Advantages and Disadvantages of Open Reflux Method and Close
Reflux Method.
04
(c)
Write a short note on binary mixtures and explain Class II binary mixtures with
examples.
07
OR
Q.5 (a) What is Oxygen Fixation? Write the significance of oxygen fixation in sample. 03
(b) Explain the procedure of sample collection for the following parameters:
i. Acidity ii. Oil & Grease
04
(c)
Explain the Biological degradation of Detergents in detail.
07
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This post was last modified on 20 February 2020