Physical Characteristics MCQs : This section focuses on the "Physical Characteristics". These Multiple Choice Questions (MCQs) should be practiced to improve the Physical Characteristics skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
______ represents the number of dilutions required to reduce odor.
A. Dispersion
B. Threshold odor number
C. BOD
D. COD
Question 2
_______ indicates the freshness of sewage.
A. Turbidity
B. Color
C. Temperature
D. COD
Question 3
1 TCU (True Color Unit) is equivalent to _____
A. The color produced by 1 g of platinum cobalt
B. The color produced by 1 mg of platinum cobalt
C. The color produced by 1 mg of platinum cobalt in 1L of distilled water
D. The color produced by 1 mg of platinum cobalt in 1mL of distilled water
Question 4
Identify the incorrect statement from the following?
A. High odor intensity indicates odorless water
B. Fresh sewage is odorless
C. Turbidity can be measured by turbidity rod
D. NTU is a unit of turbidity
Question 5
If the PO value is 6, what does it imply?
A. No perceptible odour
B. Very faint odour
C. Very distinct odour
D. Extremely strong odour
Question 6
In India, the average temperature of sewage is __________
A. 10oC
B. 20oC
C. 40oC
D. 80oC
Question 7
One JTU is equivalent to turbidity produced by __________
A. 1mg of fine silica dissolved in 1L of distilled water
B. 1g of fine silica dissolved in 1L of distilled water
C. 1g of fine silica dissolved in 1ml of distilled water
D. 1mg of fine silica dissolved in 1ml of distilled water
Question 8
Suspended solids are measured by which of the following?
A. Turbidity rod
B. Gravimetric test
C. Chromatography
D. Jackson’s turbidity meter
Question 9
The color of the septic sewage is __________
A. Pink
B. Red
C. Black
D. Grey
Question 10
The maximum permissible limit for suspended solids is ____________
A. 10 mg/l
B. 20 mg/l
C. 30 mg/l
D. 40 mg/l
Question 11
The odor in wastewater is measured by __________
A. Osmoscope
B. Chromatography
C. Olfactometer
D. Turbidity meter
Question 12
The odor quality of Amines is __________
A. Rotten egg
B. Fishy
C. Fecal matter
D. Decayed cabbage
Question 13
The odor quality of compound is ammoniacal. Identify the type of compound from the following options.
A. Acetic acid
B. Benzene
C. Ammonia
D. Methane
Question 14
The permissible limit of turbidity of domestic water is ____ ppm.
A. 5-10
B. 1-5
C. 10-50
D. 10-30
Question 15
The range for threshold odour number is __________
A. 0-3
B. 1-5
C. 1-3
D. 0-5
Question 16
The range of temperature of water that is required to do the temperature test is __________
A. 10-250C
B. 0-250C
C. 10-300C
D. 20-300C
Question 17
The size of suspended solids lies in the range of ________
A. 10-3 – 10-6 mm
B. 103 – 106 mm
C. 10-1 – 10-3 mm
D. 101 – 103 mm
Question 18
The type of wastewater from the flushing operation of toilet is __________
A. Green water
B. Red water
C. Black water
D. Brown water
Question 19
The wastewater from the kitchen is an example of __________
A. Black water
B. Yellow water
C. Green water
D. Grey water
Question 20
Threshold odour number testing is preferred in hot water.
A. True
B. False
Question 21
What is the full form of NTU in context with turbidity?
A. Number of transfer unit
B. Neurological turbidity unit
C. Nephelometric turbidity unit
D. Network terminal unit
Question 22
When depth of insertion of turbidity rod increases, the reading in the turbidity rod ___
A. Decreases
B. Increases
C. First decrease, then increase
D. Remains constant
Question 23
Which color indicates the fresh sewage?
A. Pink
B. Red
C. Black
D. Grey
Question 24
Which method is used to measure the color of water?
A. Gravimetric analysis
B. Chromatography
C. Tintometer method
D. Hydrometer analysis
Question 25
Which of the following is measured in mg/L?
A. Unit weight
B. Coefficient of cohesion
C. Discharge
D. Turbidity
Question 26
Which of the following instrument is used to measure turbidity?
A. Olfactometer
B. Turbidity meter
C. Colorimeter
D. Spectrophotometer
Question 27
Which of the following represents the physical characteristics of water?
A. Chloride content
B. BOD
C. Turbidity
D. COD
Question 28
Which of the following statement is wrong regarding turbidity?
A. It is an extent to which light is absorbed by particles in the water
B. It is expressed in ppm
C. It depends on the fineness of particle present in the water
D. Turbidity rod is a laboratory method to measure turbidity