Question 1 Hard Level 85
Why is abundance of water vapour in the troposphere important for meteorology? A Because it changes Earth orbit B Because it instantly melts rocks C Because clouds rainfall and humidity are linked with it D Because it stops ocean tides
Correct answer: C The troposphere is the main weather layer and water vapour drives weather processes. Therefore its distribution is very important.
View question details Question 2 Hard Level 85
If the ground cools rapidly but the air is very dry why will less dew form? A Because a cool surface cannot condense water vapour B Because dry air does not contain sufficient water vapour for condensation C Because rapid cooling always decreases relative humidity D Because dew forms only after rainfall
Correct answer: B Dew forms when air near the ground cools to its dew point and its water vapour condenses into tiny droplets. Very dry air contains little water vapour, so even rapid cooling provides less vapour to condense and less dew forms. Option A is incorrect because a cool surface promotes condensation. Exam tip: For dew formation, remember both cooling to the dew point and adequate moisture in the air.
View question details Question 3 Hard Level 85
Which calculation correctly uses relative humidity? A Dividing actual vapour pressure by saturation vapour pressure and multiplying by (100) B Multiplying rainfall by wind speed C Subtracting cloud height from temperature D Adding sea salinity to pressure
Correct answer: A Relative humidity is calculated by (RH=\frac{e}{e_s}\times100). Remember the roles of actual and saturation pressure in the formula.
View question details Question 4 Hard Level 85
Direct change of water vapour into ice crystals is an example of which process? A Melting B Deposition C Evaporation D Boiling
Correct answer: B Change of water vapour into solid without becoming liquid is deposition. It is important in cold clouds and frost.
View question details Question 5 Hard Level 85
What is the main reason clouds form more on the windward slope in mountains? A Air descends and warms B Water vapour is destroyed C Moist air rises cools and condenses D Slope is always below sea
Correct answer: C On the windward slope moist air rises and cools to condense. This is the basis of orographic clouds.
View question details Question 6 Hard Level 85
If temperature at height is below freezing in what form can condensed moisture remain in cloud? A Only water vapour B Only dry dust C Only nitrogen D Ice particles or supercooled droplets
Correct answer: D In cold clouds moisture may exist as ice particles or supercooled droplets. Identify cloud particle form from temperature.
View question details Question 7 Hard Level 85
Why does body temperature regulation become difficult in sultry weather? A Because evaporation of sweat becomes slow B Because sweat instantly becomes ice C Because air has no water vapour D Because sunlight stops
Correct answer: A In high relative humidity sweat dries slowly so the body cools less. In health and weather questions check humidity.
View question details Question 8 Hard Level 85
Under which condition is evaporation from a water surface most likely to be low? A Warm dry strong wind B Cool saturated calm air C Hot dry high temperature D Strong wind and low humidity
Correct answer: B Cool saturated and calm air slows evaporation. Low temperature high humidity and low wind are opposing factors.
View question details Question 9 Hard Level 85
If the dew point of a place is far below the current temperature what does it indicate? A Air is nearly saturated B Fog is certain C Air is relatively dry D Rain will occur immediately
Correct answer: C A large difference between current temperature and dew point indicates low moisture. Use dew point depression to identify dryness.
View question details Question 10 Hard Level 85
Why may dew be seen on grass in the morning but less on a nearby warmer road? A There is no water vapour over road B Grass can provide a cooler surface at night C Road always forms clouds D Grass makes air pressure zero
Correct answer: B Dew forms on cool surfaces and grass can cool faster than road. Difference in surface temperature is important.
View question details Question 11 Hard Level 85
Which option gives the correct energy relation and state change for evaporation and condensation? A Evaporation is liquid to gas and heat absorption B Evaporation is gas to liquid and heat release C Condensation is liquid to gas and heat absorption D Both occur without energy
Correct answer: A Evaporation absorbs heat while changing liquid to gas. Condensation is opposite as gas changes to liquid and releases heat.
View question details Question 12 Hard Level 85
Under which condition can air reach saturation quickly? A Temperature keeps rising and moisture decreases B Moist air cools rapidly C Air is completely dry and hot D Air has no water source
Correct answer: B When moist air cools rapidly its water vapour holding capacity decreases and saturation can occur quickly. This can start condensation.
View question details Question 13 Hard Level 86
If actual water vapour content remains the same but temperature rises, why does relative humidity generally decrease? A Because warm air has a higher saturation capacity B Because water vapour immediately turns into ice in warm air C Because air pressure always becomes zero D Because evaporation completely stops
Correct answer: A As temperature rises, air can hold more water vapour, so relative humidity falls for the same vapour content. Exam tip: distinguish actual humidity from saturation capacity.
View question details Question 14 Hard Level 86
Why is dew point temperature considered a more reliable indicator of moisture content? A Because it is directly linked with the actual amount of water vapour present B Because it only tells wind direction C Because it measures the sound of rainfall D Because it stabilizes ocean salinity
Correct answer: A A higher dew point means more water vapour in the air. Exam tip: connect dew point with actual moisture, not just air temperature.
View question details Question 15 Hard Level 86
What is the most suitable combined reason for rapid evaporation on a hot and dry day? A High temperature and low relative humidity B Low temperature and high relative humidity C Fully saturated air and calm surface D Icy surface and closed air
Correct answer: A Heat gives molecules energy and dry air can accept more vapour. Exam tip: link evaporation with both temperature and humidity.
View question details Question 16 Hard Level 86
If air is saturated and water is available at the surface, why will evaporation still be very low? A Because the air is already holding maximum water vapour B Because water temperature is always zero C Because oxygen in air is exhausted D Because sunlight destroys water vapour
Correct answer: A Saturated air has almost no extra capacity to accept vapour. Exam tip: remember saturation as a limit on evaporation.
View question details Question 17 Hard Level 86
Why is water vapour alone not enough for condensation to begin? A Because cooling and condensation nuclei are also needed B Because water vapour always needs fire C Because water vapour is only a solid substance D Because condensation occurs only underground
Correct answer: A Condensation needs cooling to dew point and tiny particles for droplet formation. Exam tip: mention both dew point and condensation nuclei.
View question details Question 18 Hard Level 86
What is the main process behind cloud formation in air rising along a mountain slope? A Cooling by expansion followed by condensation B Extreme heating by compression and evaporation C Deposition of salt at sea level D Direct freezing of groundwater
Correct answer: A Rising air expands, cools, and condenses at dew point. Exam tip: remember adiabatic cooling in orographic rainfall.
View question details Question 19 Hard Level 86
Despite high evaporation over oceans, why does relative humidity not always remain the same? A Because temperature and air movement keep changing saturation and vapour content B Because seawater does not form water vapour C Because wind does not blow over oceans D Because clouds form only over land
Correct answer: A Relative humidity depends on both actual vapour and saturation capacity. Exam tip: do not treat it as constant over oceans.
View question details Question 20 Hard Level 86
Why is dew more likely to form on clear nights? A Because the surface can cool rapidly by radiation to the dew point B Because clouds completely heat the surface C Because evaporation is impossible at night D Because air loses all weight
Correct answer: A Clear nights allow stronger radiational cooling and vapour condenses on surfaces. Exam tip: connect clear sky and calm air with dew.
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