C-02 — Water for Life

Approximately what percentage of the human body is water?

Meat, fish and vegetables contain approximately what percentage of water?

Approximately what percentage of the earth's surface is covered with water?

What is the melting point of ice?

What is the actual boiling point of water at atmospheric pressure?

What is generally said to be the boiling point of water?

At which temperature is the density of water the highest?

What is the maximum density of water?

The maximum density of water in SI units is —

Pure water is —

Pure water —

What makes water electrically conductive?

Water is called a "universal solvent" because —

The amphoteric behaviour of water means —

What is the pH of pure water?

What is the chemical formula of water?

One molecule of water consists of —

Modern technology shows that water molecules are present in the form of —

Which is the largest source of water on earth?

Approximately what percentage of total world water is in seas and oceans?

Sea water is also called —

Approximately what percentage of total water reserve exists as glaciers and snow?

Approximately what percentage of total water on earth is actually usable?

Which of the following is NOT a source of usable water?

We get groundwater through —

Which of the following is NOT a main source of fresh water in Bangladesh?

Why is the groundwater in many areas of Bangladesh unsuitable for drinking?

In arsenic-affected areas of Bangladesh, what is collected, treated and drunk?

Which of the following is an aquatic plant?

Which plant grows both in water and on land?

Aquatic flora maintain the level of dissolved oxygen by —

Aquatic plants serve as —

Aquatic plants take water and minerals through —

The soft stems of aquatic plants are an adaptation for —

Aquatic plants usually reproduce —

Aquatic plants acquired their characteristics through —

Fish takes oxygen through —

Gills of fish are suitable for taking oxygen from —

Approximately what percentage of our required protein comes from fish?

Natural surface water in rivers, canals and lakes should be —

Turbid water is harmful to aquatic flora because it —

Which is a NATURAL reason for water turbidity?

Which is a MANMADE cause of turbidity?

Launches and steamers get stranded in Bangladesh mainly because of —

The presence of radioactive substances in river water can cause —

Waste materials in surface water may produce —

The minimum level of dissolved oxygen required for sustaining life in water bodies is —

If the dissolved oxygen in water is reduced, aquatic fauna suffer from —

Increase in water temperature causes the dissolved oxygen to —

For neutral water the pH is —

If water is acidic, the pH is —

Which pH range is suitable for sustaining aquatic biota?

Surface water is usually —

Which of the following is most sensitive to pH changes?

In highly acidic water, important elements like calcium are extracted leading to —

Why does the national fish hilsha migrate to fresh water during spawning?

What is the national fish of Bangladesh?

Approximately what percentage of the total water on earth is saline?

Precipitation is a kind of —

Disruption of the natural water cycle may lead to —

In the water cycle, water vapour goes upward and —

Sea water cannot be used in industry because —

Most crops cannot grow with saline water because —

Ground water is normally —

Which is NOT a method of water purification?

Filtration is a process to —

In water filtration, water is passed through —

Which gas is commonly used as a disinfectant in water purification?

The chemical formula of bleaching powder is —

Water purification tablets used during floods in Bangladesh basically contain —

Other than chlorine, germs in water can be destroyed by —

In bottled water factories, water is disinfected by —

After starting to boil, water should be heated additionally for how long to disinfect completely?

Boiling is a method of —

Which method gives 100% pure water suitable for manufacturing medicines?

In distillation, water is —

Nanotechnology purifies water using all EXCEPT —

A major part of domestic wastewater pollutes rivers and lakes through —

Solid waste in homes typically undergoes biodegradation in —

Which is NOT a source of water pollution from agriculture?

The water of which Bangladeshi river is described as black with intolerable odour due to industrial pollution?

Which industry on the bank of Buriganga is mentioned as a major polluter?

Boats, launches, steamers and ships pollute water mainly by discharging —

Wastewater from chemical laboratories pollutes water mainly with —

Which of the following is a water-borne disease?

Which set of diseases spread through water?

Substances like cow dung, plant residue, sugar and glucose in water —

Which lake in the USA was declared dead in the 1960s?

What was the main reason Lake Erie was declared dead?

Which two substances cause algae bloom in water bodies?

After phosphate removal by treatment, how long did it take for Lake Erie to recover?

Which of the following effects is caused by mercury (Hg) in the human body?

Which is NOT an effect of lead (Pb) on the human body?

Arsenic in drinking water causes —

Which of the following is a radioactive water pollutant?

The recent nuclear accident that released huge radioactivity to water happened at —

What natural disaster caused the Fukushima nuclear accident?

Global warming means —

Compared to 100 years ago, the atmospheric temperature has increased approximately by —

Rising sea level due to global warming will submerge —

When sea level rises, fresh water sources become —

Both increase in temperature AND increase in salinity cause dissolved oxygen to —

Computer modeling shows that due to global warming —

Significant increase in winter precipitation due to global warming may cause —

The recent maximum summer temperature observed in Bangladesh has reached as high as —

Due to sea level rise in the Bay of Bengal, approximately what fraction of Bangladesh is estimated to be submerged?

In southwestern Bangladesh including Satkhira District, underground water has become saline mainly because of —

According to a study, housewives in affected areas have to travel approximately how far to bring collected rain water?

Which country has already lost significant land to submergence producing climate refugees?

Which of the following is NOT a function of wetlands?

Forests help by —

In municipal areas, one major reason for water pollution is —

Rainwater collected from rooftops can be used for all EXCEPT —

To allow rainwater to infiltrate the ground, instead of concrete we can use —

ETP stands for —

A common ETP cannot treat wastewater from all industries because —

Use of organic fertilizers helps prevent water pollution because they —

Water pollution from agricultural land can also be prevented by —

Fertilizers should NOT be applied —

Which statement is correct?

Geologically, Bangladesh is a —

Which of the following rivers is mentioned as already dead in Bangladesh?

The state of the mighty Padma is shown to be in danger by cart movement below —

Which rivers are almost dead due to encroachment?

Which rivers died due to embankments on the Padma and the Jamuna?

In the southwestern part of Bangladesh, which rivers died due to embankments?

Approximately how much solid waste is generated daily in Dhaka city?

Approximately what fraction of Dhaka's solid waste is collected and managed by Dhaka City Corporation?

In which year did the Indian Government first divert water flow in the Ganges?

Bangladesh and India signed the equitable water distribution agreement on the Ganges in —

India has planned to divert Brahmaputra water to western India through —

The proposed Indian dam that may convert the eastern part of Bangladesh into a desert is —

The haor area at risk due to the Brahmaputra diversion plan is approximately —

Which of the following is NOT among the five fundamental human rights mentioned in the chapter?

The Ramsar Convention was held on —

Bangladesh signed the Ramsar Convention in —

The Ramsar Convention was amended in —

The Helsinki Rule was adopted in —

The UN convention on the use of international watercourses was adopted on —

According to the 1997 UN convention, a country cannot withdraw water of a river flowing through more than one country without —

Consider the following statements about the universality of water:

Which plant grows both in water and on land?

Consider the following statements about preventing water pollution:

Onik and Tushar each culture fish in separate ponds. Onik's pond water has pH 7.5 while Tushar's pond water has pH 5.5. What is the nature of Onik's pond water?

(continuing the Onik/Tushar scenario) What should be applied to Tushar's pond water to improve fish growth?

What is filtration?

Why is bleaching powder used for purifying water?

What is meant by the boiling point of water?

Mr. Ratan disinfects water for a bottled water plant and a pharmaceutical industry. Does he use the same method?

Why is water called an amphoteric substance?

Which dissolved gas in water is essential for aquatic animals?

How can completely pure water be obtained?

Which best describes the water cycle?

Why is even a 1°C increase in the Earth's average atmospheric temperature so important?