סוגיות בסביבה, קיימות ושמירת טבע - אב"ג - רק השאלות מהבחנים באנגלית

How many people on earth suffer from water availability and water sanitation issues?

1

שאלה #19528

		A few Billions
		About 100 Million
		Not many
		None of the above

מיין לפי

Greywater is typically defined as:

1

שאלה #19529

		Domestic wastewater
		Municipal wastewater excluding the wastewater stream from toilets
		Domestic wastewater excluding the wastewater stream from toilets
		Wash basin water

מיין לפי

Some health regulatory agencies object to on-site greywater reuse for toilet flushing:

1

שאלה #19530

		In order to protect citizens, as greywater reuse is often too expensive
		Because it often contains pathogens, thus may lead to the spread of diseases
		Because it may introduce pathogens to nearby water sources
		Agencies do promote greywater reuse in general, and for toilet flushing in particular, as it saves precious water

מיין לפי

Could the practice of reusing raw greywater for irrigation negatively impact irrigated soil?

1

שאלה #19531

		Yes, because the detergents in the greywater can enhance soil disinfection and reduce the number of pathogens
		No, because greywater is not contaminated as contaminated as domestic wastewater and thus no impact is expected
		Yes, because greywater often contains surfactants that might enhance water repellency in soils
		Yes, because greywater might form soil crusts due to its low surface tension, resulting from the presence of surfactants

מיין לפי

Raz Dahan 0 נקודות · יותר מ-6 חודשים

מוניטין: 1

reusing raw greywater= water repellency in soils

Small onsite greywater treatment systems are often low tech-low costs units:

1

שאלה #19532

		Because such systems can produce sufficient water quality to meet high standards for unlimited irrigation by most.
		Because these systems are often simple to operate and can be used by many people
		Because many consider greywater as an effluent stream that does not pose high risks
		All of the above

מיין לפי

Alona Barsukov 0 נקודות · יותר מ-6 חודשים

מוניטין: 15

All of the above

Potential advantage/s of reusing greywater is/are:

1

שאלה #19533

		National and personal economical savings
		Diminishing waste of freshwater
		Reusing nutrients
		All of the above

מיין לפי

'Total suspended solids' is:

1

שאלה #19534

		One measure to evaluate the level of water contamination
		Clogs sprinklers if its concentration is > 10 mg/L
		The solid fraction that passes through a 0.45 micron filter
		A lengthy analysis that can be substituted after calibration with analysis of electrical conductivity

מיין לפי

Salinity:

1

שאלה #19535

		Is significantly affected by organic matter as estimated by BOD analysis
		Is the sum of all ions expressed as mg/L and can often be estimated by a simple and quick measure of electrical conductivity
		Typically decreases in greywater after biological treatment
		In greywater is used to reduce the number of pathogens

מיין לפי

Most water on earth is:

1

שאלה #19536

		Stored in the form of ice
		Salty and found in the oceans
		Found as groundwater and is often quite difficult to extract
		Freshwater that is swiftly contaminated due to anthropogenic activity

מיין לפי

The Global freshwater crisis is a result of:

1

שאלה #19537

		Unequal distribution, growing demand and poor management of water resources
		The increase in water prices
		Receiving less rainfall due to global climate change
		Saline water intrusion and iceberg melting

מיין לפי

סוגיות בסביבה, קיימות ושמירת טבע - אב"ג - רק השאלות מהבחנים באנגלית

Discuss, Learn and be Happy דיון בשאלות

How many people on earth suffer from water availability and water sanitation issues?

Greywater is typically defined as:

Some health regulatory agencies object to on-site greywater reuse for toilet flushing:

Could the practice of reusing raw greywater for irrigation negatively impact irrigated soil?

Small onsite greywater treatment systems are often low tech-low costs units:

Potential advantage/s of reusing greywater is/are:

'Total suspended solids' is:

Salinity:

Most water on earth is:

The Global freshwater crisis is a result of:

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