Olympiad Test: Water A Precious Resource
20 Questions MCQ Test Science & Technology for UPSC CSE | Olympiad Test: Water A Precious Resource
Total water is maintained by
Total water is maintained by water cycle during which evaporation and condensation of water takes place.
In gaseous form water is present in atmosphere as
In atmosphere, water is present in form of water vapour along with other gases of atmosphere.
Earth appear blue from sky due to presence of
Earth appear blue from sky due to presence of large surface covered with water. About 2/3 of earth surface is covered with water.
Amount of water recommended by United Nation per person per day is
The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of 50 litres per person per day.
The process of changing water vapour into water is called
The process of changing water vapour into water is called condensation
Plants loose water in form of
Loss of water in form of water vapour from aerial parts of plant is called as transpiration. It mainly occurs through stomata.
Which one is not a natural source of water
Ponds, rivers and lake are natural source of water but canal is a man-made source of water.
Loss of water by plants is called
Loss of water in form of water vapour by plants is called as transpiration.
The purest form of water is
Rain water is purest form of water as it is free from all kinds of salts and other impurities.
In water works, first step is
The process involve in purifying the water to make it suitable for drinking is called water work. The first step of water work is sedimentation.
In which season water scarcity is most acute?
In summer season, the scarcity of water is acute as most of the sources of water get dried during this period.
Plants absorbs water from
Plants absorbs water from water present between the soil particles through root hairs.
An example of underground water is
River, lake and sea are sources of surface water but well is an example of underground water.
River Yamuna is polluted near Delhi due to
River Yamuna is polluted near Delhi due to addition of untreated sewage into river water from all over Delhi.
Which source of water is mostly used by construction site of building?
At construction site of building, ground water is used mostly by extracting water using tube-well.
Water is natural resource which is
Water is natural resource, which is inexhaustible but due to human interference in natural replenishment it becomes polluted.
Addition of harmful substance in water leads to
Addition of harmful substance in water leads to water pollution, which may be untreated sewage, industrial effluents etc.
Of the total amount of water present on the earth, the water available for human use is about
Of the total amount of water present on the earth, the water available for human use is about 1%. Most of the water is present in ocean and sea, which are hard water and remaining soft water are on poles in form of ice.
People living near sea or ocean also feels lacks of water because
People living near sea or ocean also feel lacks of water because sea water is salty and cannot be used by human beings.
About 70% of our body consists of
About 70% of our body consists of water in blood and cytoplasm of cells.
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