Water Properties and Water Cycle
Practice questions for understanding water properties, the water cycle, evaporation, condensation, clouds, groundwater, droughts, and floods.
Questions
In direct sunlight, water in a steel saucer evaporates faster than water in a glass tumbler. Why?
- Water in saucer is heated faster.
- Rate of evaporation depends on the surface area of the liquid.
- Steel enhances the rate of evaporation while glass is an inert material.
- Saucer allows all the water molecules to escape whereas a tumbler holds back some of the vapour from escaping.
Which of the following is the reverse of evaporation?
- Deposition
- Sublimation
- Vaporization
- Condensation
In which of the following conditions will the rate of evaporation arrested to the maximum extent when water in a saucer is left exposed to direct sunlight for two days?
- When a pinch of salt is mixed in the water.
- When a pinch of sugar is mixed in the water.
- When two spoons of oil are added to the water.
- When water in the saucer is stirred with a spoon continuously for five to six minutes every hour.
Consider saucer A containing seawater, saucer B containing river water and saucer C containing processed drinking water poured from a packaged pouch. What will happen when all three of them are kept exposed to direct sunlight for two days provided that the amount of water in each of the saucers is the same?
- All three water samples will evaporate at the same time.
- Rate of evaporation will be the highest in drinking water followed by river water and least in the seawater.
- Rate of evaporation will be the highest in seawater followed by river water and least in the drinking water.
- Seawater and river water will evaporate, but the drinking water will remain as it is.
Which of the following best explains the word ‘cloud’?
- Densely accumulated mixture of gases in the atmosphere
- Visible mass of liquid droplets suspended in the atmosphere
- Suspended particles in air assemble together to form a white or black mass
- Gathering of various chemicals in air at one place for reacting with each other and releasing water
Why do clouds in the rainy season appear black?
- Because rain clouds are full of black dirt particles.
- Because sunlight is very dim in the rainy season.
- Because rain clouds are dense and opaque.
- Because atmosphere is not clear in the rainy season.
Why condensation on a glass window is an unwanted phenomenon?
- It causes fungal diseases.
- It interferes with clear view from the window.
- It changes the room temperature significantly.
- It affects the glamorous look of the interior.
Which of the following is the consequence of drought?
- Erosion and dust storms
- Rapid snow melting
- Overflowing sewerages and canals
- Damp soils
Which of the following benefits is derived from freshwater floods?
- Air purification
- Enhanced greenery
- Improved fisheries
- Decrease in water impurities
In which of the following processes is the principle of condensation used in the laboratory?
- Dehydration
- Hydrolysis
- Precipitation
- Distillation
Levees, bunds, and reservoirs help in the management of
- floods
- droughts
- snow storms
- earthquakes
Which of the following is a source of groundwater?
- Rain water that seeps deep into the ground forms groundwater.
- Surface snow m<font face="Arial">elts</font> in the summer and finds its way to underground areas.
- <font face="Arial"><font size="2">H</font>ail that settles <font size="2">on the top of mountain melts down at times due to rise in temperat<font size="2">ure, and </font></font></font>seeps deep into underground areas.
- <font face="Arial"><font size="2">E</font>xcess water that <font size="2">leaks from plant roots seeps into underground areas and forms ground water. </font></font>
- Volcanic eruptions lead to burial of rivers and ponds, thus forming groundwater.
In a typical water cycle, water goes through which of the following phases?
- Solid and gas
- Liquid and gas
- Solid, liquid and gas
- Solid and liquid
Which of the following is associated with drought?
- Marsh area
- Xeric area
- Swamp area
- Humid area
What affect does hurricane and earthquakes have on the environment?
- Uncontrolled floods
- Famines
- Avalanches
- Tornadoes
Why dew drops are formed on the outer surface of a glass of chilled water?
- Molecules of water pass through the minute pores of the glass and deposit on its surface due to the low temperature.
- Cold water droplets spill over the surface of the glass at the time of filling.
- Glass reacts with chilled water and expels water molecules out of it.
- The vapour in air condenses on the cool surface of the glass resulting in fine dew drops.
Which of the following produces water vapour?
- Refrigeration of water
- Bursting of a balloon
- Sublimation of ice
- Spraying perfume on a fabric
Why does water in a glass plate evaporate much earlier than the same amount of water in a glass tumbler when exposed to sunlight?
- <font face="Arial">The water in the <font size="2">pla<font size="2">te <font size="2">loses weight when exposed to direct sunlight, whereas the water in the tum<font size="2">bler does not lose weight. </font></font></font></font></font>
- <font face="Arial">The water in a plate gets exposed to more of warm air.</font>
- <font face="Arial">The water in the plate gets exposed to more of direct sun rays.</font>
- The plate gets heated in the sun and in turn heats up the water in it leading to evaporation.
- The water in the plate gains more dust and dirt particles that enhance the rate of evaporation.
Which of the following can be demonstrated when a burner is placed at one side of a glass tumbler of water?
- Advection
- Convection
- Conduction
- Diffusion