About ____ human beings have no access to safe drinking water.

Correct! Wrong!

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It has been reported that more than one billion of our fellow human beings have no access to safe drinking water.

____ is used as a fuel or can be used to produce electricity.

Correct! Wrong!

Bio-gas is used as a fuel or can be used to produce electricity.

Which of the following is an aquifer?

Correct! Wrong!

Underground water below the water table is known as an aquifer.

Which of the following disinfectants is used in swimming pools?

Correct! Wrong!

Chlorine is used as a disinfectant in swimming pools.

When all the solids wastes are cleared from waste water, the cleared water is called ____.

Correct! Wrong!

When all the solids wastes are cleared from waste water, the cleared water is called clarified water.

About ____ % of water is present in the form of polar ice-caps and glaciers.

Correct! Wrong!

About 1.6 % of water is present in the form of polar ice-caps and glaciers.

Waste water released by homes is called as ____.

Correct! Wrong!

Waste water released by homes is called as sewage that is rich in organic content.

A pipe carrying sewage is called a ____.

Correct! Wrong!

A pipe carrying sewage is called a sewer.

Which of the following periods has been proclaimed by the United Nations as the International Decade for action on “Water for life”?

Correct! Wrong!

The United Nations has proclaimed the period 2005–2015 as the International Decade for action on “Water for life”. All efforts made during this decade aim to reduce by half the number of people who do not have access to safe drinking water.

Dried ____ is used as manure.

Correct! Wrong!

Dried sludge is used as manure.

A clear, colourless, odourless and tasteless liquid essential for all living organisms is known as ____.

Correct! Wrong!

A clear, colourless, odourless and tasteless liquid essential for all living organisms is known as water.

Surface water is the water present ____.

Correct! Wrong!

The water present on the surface of the earth is known as surface water. The main sources are rain, rivers, lakes, ocean and sea.

Organic impurities in sewage are represented by all except ____.

Correct! Wrong!

Nitrates constitute inorganic impurities of sewage.

In a waste water plant, solids like faeces are removed with a ____.

Correct! Wrong!

In a waste water plant, solids like faeces are removed with a scraper.

Cleaning of water is a process of removing ____.

Correct! Wrong!

Cleaning of water is a process of removing contaminants of water.

The process of waste water treatment is commonly known as ____.

Correct! Wrong!

The process of waste water treatment is commonly known as sewage treatment.

The human body has about ____ % water by weight.

Correct! Wrong!

The human body has about 70 % water by weight.

The byproducts of waste water treatment are ____.

Correct! Wrong!

The byproducts of waste water treatment are sludge and bio-gas.

Sludge is decomposed by ____.

Correct! Wrong!

Sludge is decomposed by anaerobic bacteria.

Water on the earth is present in the form of ____.

Correct! Wrong!

Water on the earth is present in all three forms - solid, liquid and gas. In the liquid form, it is present in oceans, in solid form it is present as ice, and water vapour is the gaseous form.

Sewage is a liquid waste that can cause ____ pollution.

Correct! Wrong!

Sewage is a liquid waste that can cause water and soil pollution.

____ is produced when sludge is decomposed by anaerobic bacteria.

Correct! Wrong!

Bio-gas is produced when sludge is decomposed by anaerobic bacteria.

The substance that dissolves in water is known as ____.

Correct! Wrong!

The substance that dissolves in water is known as solute. Solute and solvent together constitute a solution.

Activated sludge is about ____ water.

Correct! Wrong!

Activated sludge is about 97 % water.

____ is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, and disease-causing bacteria and other microbes.

Correct! Wrong!

Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, and disease-causing bacteria and other microbes.

____ is pumped into clarified water to help aerobic bacteria to grow.

Correct! Wrong!

Air is pumped into clarified water to help aerobic bacteria to grow.

Which of the following is not a factor responsible for contaminating water?

Correct! Wrong!

Potassium permanganate is a used as a disinfectant. It is added to purify water.

Which of the following is not an organic impurity?

Correct! Wrong!

Metal is an inorganic impurity.

Liquid waste product is known as ____.

Correct! Wrong!

Liquid waste product is known as sewage.

Waste water released by houses is called ____.

Correct! Wrong!

Waste water released by houses is called sewage.

ICSE Class 9th Biology - Safe Disposal of waste MCQs
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