01 In the hundred unit heat budget model the return of thirty five units to space is the result of which combined process?0 reads0 helpful★ – (0)
A Only surface emission B Reflection by clouds surface and atmospheric scattering C Only oceanic absorption D Only release of latent heat
Answer and explanation Correct answer: B . Reflection by clouds surface and atmospheric scattering
Explanation: Thirty five units return through clouds surface and atmospheric particles. Exam tip: connect it with Earth's total albedo.
02 If reflection by clouds decreases but surface albedo remains the same what happens to net solar absorption?0 reads0 helpful★ – (0)
A Net absorption will decrease B Net absorption will remain unchanged C Net absorption will increase D Terrestrial radiation will end
Answer and explanation Correct answer: C . Net absorption will increase
Explanation: Lower cloud reflection can leave more shortwave energy in the Earth system. Exam tip: connect reduced cloud albedo with more absorbed energy.
03 Why is the atmosphere relatively transparent to solar shortwaves and more absorbing to terrestrial longwaves?0 reads0 helpful★ – (0)
A Because Earth is hotter than the Sun B Because greenhouse gas absorption is wavelength selective C Because clouds stop only sound D Because oceans do not form longwaves
Answer and explanation Correct answer: B . Because greenhouse gas absorption is wavelength selective
Explanation: Greenhouse gases absorb longwave energy more effectively. Exam tip: treat selective absorption as the basis of the greenhouse effect.
04 What is the main importance of the atmospheric window in the heat budget?0 reads0 helpful★ – (0)
A It allows some longwave radiation to escape directly to space B It brings all solar rays to the surface C It stops clouds from forming D It makes ocean temperature zero
Answer and explanation Correct answer: A . It allows some longwave radiation to escape directly to space
Explanation: The atmospheric window is a path for direct escape of longwave energy. Exam tip: remember it as an outgoing radiation path.
05 When the surface absorbs fifty one units of energy why is all of it not used only to raise temperature?0 reads0 helpful★ – (0)
A Because part of energy goes into evaporation convection and longwave emission B Because energy is immediately destroyed C Because the surface cannot touch energy D Because the Sun pulls the energy back
Answer and explanation Correct answer: A . Because part of energy goes into evaporation convection and longwave emission
Explanation: The surface divides energy into different fluxes. Exam tip: connect absorbed energy with multiple heat fluxes.
06 If net radiation is positive in an area but temperature is not rising rapidly what is the most suitable reason?0 reads0 helpful★ – (0)
A All energy is being reflected B Extra energy is being used in evaporation or heat transfer C Solar radiation did not reach Earth D The atmosphere is completely absent
Answer and explanation Correct answer: B . Extra energy is being used in evaporation or heat transfer
Explanation: Positive energy balance does not always give immediate sensible temperature rise. Exam tip: remember energy partitioning.
07 Why does a dry and clear atmosphere cool the surface rapidly at night?0 reads0 helpful★ – (0)
A Lack of water vapour and clouds reduces counter radiation B The Sun moves very far at night C The surface stops emitting radiation D Oceans create all heat
Answer and explanation Correct answer: A . Lack of water vapour and clouds reduces counter radiation
Explanation: Less water vapour and clouds trap less longwave energy. Exam tip: connect dry clear night with radiative cooling.
08 If albedo decreases and evaporation also decreases what can be the combined effect on local temperature?0 reads0 helpful★ – (0)
A Cooling tendency will increase B Warming tendency may strengthen C Energy balance will become zero D Terrestrial radiation will be impossible
Answer and explanation Correct answer: B . Warming tendency may strengthen
Explanation: Lower albedo increases absorption and lower evaporation reduces cooling. Exam tip: understand combined surface controls.
09 Why is ice albedo feedback called positive feedback in the heat budget?0 reads0 helpful★ – (0)
A Because initial ice loss can further increase absorption and melting B Because ice always produces energy C Because albedo has no relation with temperature D Because melting stops solar energy
Answer and explanation Correct answer: A . Because initial ice loss can further increase absorption and melting
Explanation: When ice decreases darker surface is exposed and more energy is absorbed. Exam tip: write the feedback chain in order.
10 In which situation can clouds show more warming effect than cooling effect in the heat budget?0 reads0 helpful★ – (0)
A When their longwave trapping is more effective than shortwave reflection B When they return all solar energy C When they remove the atmosphere D When they make the solar constant zero
Answer and explanation Correct answer: A . When their longwave trapping is more effective than shortwave reflection
Explanation: The total effect of clouds depends on type height and time. Exam tip: do not treat cloud effect as fixed.
11 Why is climate at high latitudes not determined only by local radiation despite low insolation?0 reads0 helpful★ – (0)
A Because winds and ocean currents bring external heat B Because insolation is always high at poles C Because longwave radiation does not occur there D Because poles are sources of the Sun
Answer and explanation Correct answer: A . Because winds and ocean currents bring external heat
Explanation: Horizontal heat transfer reduces latitudinal energy difference. Exam tip: connect heat budget with circulation.
12 If oceanic heat transport weakens what may happen to polar energy deficit?0 reads0 helpful★ – (0)
A The deficit will decrease B The deficit may become regionally more effective C Solar energy will start forming D Albedo will become zero
Answer and explanation Correct answer: B . The deficit may become regionally more effective
Explanation: Oceans carry heat from warm regions toward poles. Exam tip: connect currents with latitudinal heat redistribution.
13 How does a low solar angle create a double reduction in the heat budget?0 reads0 helpful★ – (0)
A Energy spreads over a larger area and atmospheric path is longer B Energy goes directly to Earth's core C The Sun starts giving longwave radiation D Surface produces solar energy
Answer and explanation Correct answer: A . Energy spreads over a larger area and atmospheric path is longer
Explanation: Oblique rays are less intense and pass through more scattering absorption. Exam tip: remember both angle and path.
14 What is the heat budget based reason for higher night temperature in an urban heat island?0 reads0 helpful★ – (0)
A Stored daytime heat in paved surfaces is slowly released at night B The Sun shines over the city at night C Terrestrial radiation does not occur in cities D Clouds form only over cities
Answer and explanation Correct answer: A . Stored daytime heat in paved surfaces is slowly released at night
Explanation: Urban materials show high heat storage and slow heat release. Exam tip: connect heat storage with urban night warming.
15 Why is local warming after deforestation not always straightforward?0 reads0 helpful★ – (0)
A Because albedo evapotranspiration soil moisture and heat storage change together B Because deforestation stops the Sun C Because forests are unrelated to energy D Because surface emits no radiation
Answer and explanation Correct answer: A . Because albedo evapotranspiration soil moisture and heat storage change together
Explanation: Removing forests changes many energy fluxes together. Exam tip: understand deforestation effect through multi factor analysis.
16 If the surface is moist why can sensible heat flux be lower?0 reads0 helpful★ – (0)
A Because a large part of available energy can go into latent heat flux B Because moisture destroys solar energy C Because moisture stops the surface from radiation D Because conduction stops
Answer and explanation Correct answer: A . Because a large part of available energy can go into latent heat flux
Explanation: On a moist surface energy is used in evaporation and temperature rise can be lower. Exam tip: remember energy partitioning.
17 When is the importance of latent heat most clearly seen in the heat budget?0 reads0 helpful★ – (0)
A When evaporation takes energy from surface and condensation releases it in atmosphere B When rocks become hard C When a river deposits sediment D When solar constant does not change
Answer and explanation Correct answer: A . When evaporation takes energy from surface and condensation releases it in atmosphere
Explanation: Latent heat is a means of energy transfer from surface to atmosphere. Exam tip: treat it as the water cycle energy link.
18 If greenhouse gases increase and albedo also increases why can the total effect not be immediately fixed?0 reads0 helpful★ – (0)
A Because one can reduce outgoing energy and the other can reduce incoming absorption B Because both always increase temperature C Because both always reduce temperature D Because both have no relation with energy
Answer and explanation Correct answer: A . Because one can reduce outgoing energy and the other can reduce incoming absorption
Explanation: Opposite energy effects depend on their relative magnitudes. Exam tip: think in terms of competing forcings.
19 Why can the effect of aerosols in the heat budget be mixed?0 reads0 helpful★ – (0)
A Some particles reflect shortwave radiation and some absorb energy B All particles create the Sun C Particles turn longwave radiation into soil D Particles stop Earth's orbit
Answer and explanation Correct answer: A . Some particles reflect shortwave radiation and some absorb energy
Explanation: Aerosol effect depends on colour size height and composition. Exam tip: do not treat aerosol forcing as uniform.
20 In which example is understanding surface energy partitioning more important than only net energy balance?0 reads0 helpful★ – (0)
A Comparing irrigated field and dry paved ground under same insolation B Measuring distance of Sun and Moon C Finding earthquake epicentre D Memorising ocean salinity names
Answer and explanation Correct answer: A . Comparing irrigated field and dry paved ground under same insolation
Explanation: Even under same insolation moisture and surface properties divide energy differently. Exam tip: understand same input different output.
21 Why does long term global heat balance not mean locally constant temperature?0 reads0 helpful★ – (0)
A Because local clouds surface moisture and winds keep changing B Because global balance is a wrong concept C Because Earth emits no radiation D Because all places are identical
Answer and explanation Correct answer: A . Because local clouds surface moisture and winds keep changing
Explanation: Global average does not remove local and seasonal variation. Exam tip: remember scale difference.
22 If surface albedo is low and heat capacity is high what daytime temperature result is possible?0 reads0 helpful★ – (0)
A More energy will be absorbed but temperature rise may be slow B Energy reflection will be one hundred percent C Temperature will become zero immediately D Solar radiation will not reach
Answer and explanation Correct answer: A . More energy will be absorbed but temperature rise may be slow
Explanation: Low albedo increases absorption but high heat capacity slows warming rate. Exam tip: look at combined effects of properties.
23 Why can the surface remain warmer even when terrestrial radiation increases?0 reads0 helpful★ – (0)
A If counter radiation and incoming energy are also high B Because radiation has no relation with temperature C Because surface loses no energy D Because the Sun gives longwave radiation
Answer and explanation Correct answer: A . If counter radiation and incoming energy are also high
Explanation: Net thermal condition depends on all incoming and outgoing fluxes. Exam tip: do not conclude from a single flux.
24 Why are both strong daytime heating and strong night cooling possible in a cloudless desert?0 reads0 helpful★ – (0)
A Greater surface absorption by day and weak counter radiation at night B Sun absent by day and clouds present at night C Sand does not emit terrestrial radiation D Water vapour completely stops longwaves
Answer and explanation Correct answer: A . Greater surface absorption by day and weak counter radiation at night
Explanation: Clear dry conditions intensify both incoming heating and outgoing cooling. Exam tip: understand the desert energy cycle.
25 Which type of change can create a negative energy imbalance in the Earth system?0 reads0 helpful★ – (0)
A Albedo increases greatly and absorbed shortwave decreases B Greenhouse absorption increases greatly C Clouds trap longwave at night D Oceans store more heat
Answer and explanation Correct answer: A . Albedo increases greatly and absorbed shortwave decreases
Explanation: Higher albedo can reduce incoming absorption and create cooling tendency. Exam tip: connect negative imbalance with energy deficit.
