• A. gravitational pull exerted by the earth
• B. forces experienced by body in atmosphere
• C. force of attraction experienced by particles
• D. gravitational force of attraction towards the center of the earth.

Answer: Option D

Explanation:

• A. pressure
• B. distance
• C. flow
• D. density

Answer: Option D

Explanation:

• A. increase in viscosity of gas
• B. increase in viscosity of liquid
• C. decrease in viscosity of gas
• D. decrease in viscosity of liquid

Answer: Option D

Explanation:

• A. 25 kN/m2
• B. 245 kN/m2
• C. 2500 kN/m2
• D. 2.5kN/m2

Answer: Option B

Explanation:

• A. TOD > BOD > COD
• B. TOD > COD > BOD
• C. BOD > COD > TOD
• D. COD > BOD > TOD

Answer: Option B

Explanation:

• A. 2 to 4
• B. 4 to 6
• C. 6 to 8
• D. 8 to 10

Answer: Option C

Explanation:

• A. contains pathogenic bacteria
• B. Consists of undesirable substances making it unfit for its best use i.e. drinking
• C. is safe and suitable for drinking and domestic use
• D. is contaminated

Answer: Option B

Explanation:

• A. aquifers
• B. aquiclude
• C. filters
• D. intakes

Answer: Option D

Explanation:

• A. 100000m3
• B. 150000m3
• C. 180000m3
• D. 270000 m3

Answer: Option D

Explanation:

• A. 11500
• B. 12000
• C. 12870
• D. 14000

Answer: Option C

Explanation:

• A. 11
• B. 10
• C. 25
• D. 05

Answer: Option A

Explanation:

• A. Using lime soda process
• B. Excess lime treatment
• C. lon exchange method
• D. Using excess alum dosage

Answer: Option C

Explanation:

• A. Filtration
• B. Chlorine Tablets
• C. Alums
• D. Boiling

Answer: Option A

Explanation:

• A. Aerobic attached growth system
• B. Anaerobic attached growth system
• C. Anaerobic suspended growth system
• D. Aerobic suspended system

Answer: Option D

Explanation:

• A. D.C. supply only
• B. A.C. supply only
• C. Battery supply only
• D. All above

Answer: Option D

Explanation: