Which of the following is not a source of water impurities?

Impurities in water can be both suspended and dissolved.

Which type of impurity is larger than molecular size and visible in water?

Colloids exhibit characteristics of both suspended and dissolved substances.

Turbidity is a measure of how much ______ is scattered or absorbed in water.

Which of the following is used to measure turbidity?

The color of water caused by dissolved substances is called:

Which physical parameter is measured in True Color Units (TCU)?

High suspended solids in water can cause aesthetic problems and disease risks.

Which of the following affects solubility of gases and reaction rates in water?

Bitter taste in water is often caused by:

TDS stands for:

Which test is used to measure biodegradable organic matter in water?

The ability of water to neutralize acids is known as:

What is the most common metal found in natural water?

Hardness in water is primarily due to the presence of:

Excess fluoride (>5 mg/L) can lead to:

Which technique is used to measure metals in water?

COD values are usually lower than BOD values.

Which bacteria helps remove phosphate in treatment plants?

Which biological organism helps remove ammonia by oxidation?

The presence of coliform bacteria indicates:

Algae are always harmful in water systems.

Viruses can survive in water for up to:

Which effluent standard is stricter?

BOD limit for Standard A is:

Standard A typically applies to:

Water Quality Index (WQI) is used to:

Which of the following is not a WQI parameter?