Question 1

How does scattering of solar radiation affect Earth's heat budget?

Accepted Answer

It changes energy direction and affects the amount reaching the surface Scattering spreads radiation in different directions. Exam tip: connect scattering with atmospheric particles.

Question 2

How are energy surplus regions and energy deficit regions connected in the heat budget?

Accepted Answer

Winds and ocean currents transfer heat Atmospheric and oceanic circulation distribute heat between warmer and cooler areas. Exam tip: connect heat transfer with winds and currents.

Question 3

Which statement best describes Earth's heat budget?

Accepted Answer

It is the account of receiving solar energy and losing energy from Earth Heat budget is a balanced account of energy input and output. Exam tip: treat the word budget as energy account.

Question 4

If snow cover increases what may happen to Earth's albedo and temperature?

Accepted Answer

Albedo will increase and surface temperature may fall Snow reflects more light and may reduce absorption. Exam tip: connect snow cover with high albedo.

Question 5

What change may occur in the heat budget when greenhouse gases increase?

Accepted Answer

More longwave radiation may be absorbed Greenhouse gases trap some heat emitted from Earth. Exam tip: connect greenhouse gases with outgoing radiation.

Question 6

What is one effect of absorption of solar radiation by the atmosphere?

Accepted Answer

A part of the atmosphere is heated directly Components like ozone water vapour and dust can absorb some energy. Exam tip: connect atmospheric absorption with energy control.

Question 7

Which part of solar radiation is most affected by the ozone layer?

Accepted Answer

Ultraviolet radiation The ozone layer significantly absorbs ultraviolet rays. Exam tip: connect ozone with ultraviolet absorption.

Question 8

Exchange of heat between Earth's surface and atmosphere is linked with what?

Accepted Answer

Processes like radiation convection and latent heat Heat moves between surface and atmosphere through many processes. Exam tip: connect heat exchange with multiple processes.

Question 9

When does latent heat become important in the heat budget?

Accepted Answer

During evaporation and condensation of water Heat is stored during evaporation and released during condensation. Exam tip: connect latent heat with the water cycle.

Question 10

Why is the study of oceans useful for understanding the heat budget?

Accepted Answer

Oceans store and transfer heat Water has high heat capacity and currents distribute heat. Exam tip: remember ocean heat storage.

Question 11

In which situation may Earth's average temperature tend to increase?

Accepted Answer

When energy absorption is greater than energy emission Energy surplus works toward raising temperature. Exam tip: connect positive energy balance with warming.

Question 12

If a surface reflects more energy what will its thermal behaviour be like?

Accepted Answer

It will absorb less energy and become relatively less warm Higher reflection leaves less energy for the surface. Exam tip: connect high reflection with low heating.

Question 13

Why is the escape of terrestrial radiation to space necessary for Earth?

Accepted Answer

It removes excess heat and maintains thermal balance Outgoing energy prevents Earth from becoming excessively hot. Exam tip: treat outgoing longwave as a cooling mechanism.

Question 14

Which pair is correctly matched with heat budget processes?

Accepted Answer

Albedo reflection Albedo shows the reflecting capacity of a surface. Exam tip: remember albedo equals reflection capacity.

Question 15

What may cause less insolation to reach the ground?

Accepted Answer

Thick clouds and atmospheric dust Clouds and dust can reflect scatter or absorb radiation. Exam tip: connect cloud cover with lower insolation.

Question 16

Why is Earth's surface called both a receiver and an emitter in the heat budget?

Accepted Answer

It receives solar energy and emits longwave energy The surface absorbs solar radiation and emits terrestrial radiation. Exam tip: understand the surface as receiver and emitter.

Question 17

Why can temperature fall quickly under a clear sky at night?

Accepted Answer

Longwave heat escapes easily to space Under a clear sky there is less cloud trapping of heat. Exam tip: connect clear night with rapid cooling.

Question 18

In which process does warm air rise from Earth's surface and carry heat upward?

Accepted Answer

Convection In convection warm lighter air rises and transfers heat. Exam tip: connect convection with vertical heat transfer.

Question 19

How is water vapour active in Earth's heat budget?

Accepted Answer

It can absorb longwave radiation The direct answer is A, water vapour can absorb longwave radiation. Earth receives mainly shortwave solar energy and sends energy back toward space as longwave terrestrial radiation. Water vapour absorbs much of this outgoing longwave radiation and re-emits energy in different directions, including back toward Earth. This makes it an important natural greenhouse gas and helps regulate the heat budget. Option A is correct. Option B, water vapour is the source of solar energy, is wrong because solar energy comes from the Sun, not from atmospheric moisture. Option C, it forms Earth’s orbit, is wrong because orbit is determined by gravity and motion, not water vapour. Option D, it always makes albedo zero, is wrong because albedo concerns reflection from a surface and is not always zero because of water vapour. The chain is: Earth warms → emits longwave radiation → water vapour absorbs part of it → heat is retained and re-emitted. Memory cue: water vapour traps outgoing heat, not incoming sunlight as its main role.

Question 20

Why can land use change affect the local heat budget?

Accepted Answer

It can change surface albedo and absorption Deforestation or urbanisation changes surface reflection and heat storage. Exam tip: connect land surface with local temperature.

Question 21

Why may urban areas store more heat?

Accepted Answer

Surfaces like concrete and asphalt absorb more heat Urban materials may show lower reflection and higher heat storage. Exam tip: connect urban heat with surface material.

Question 22

Despite Earth's heat budget balance why do temperatures differ from place to place?

Accepted Answer

Local energy gain and loss vary Global balance does not mean local equality. Exam tip: keep global balance and local variation separate.

Question 23

Which process can reduce the receipt of solar energy in the heat budget?

Accepted Answer

Reflection by clouds Clouds can send part of incoming solar energy back to space. Exam tip: understand cloud reflection as incoming energy loss.

Question 24

A positive value in radiation balance generally shows which condition?

Accepted Answer

Received energy is greater than emitted energy A positive balance may indicate heat surplus. Exam tip: connect positive balance with energy gain.

Question 25

A negative value in radiation balance may indicate what?

Accepted Answer

Energy loss is greater than energy gain A negative balance can be linked with heat deficit and cooling. Exam tip: connect negative balance with energy loss.

The heat budget of the earth

Practice questions

01 How does scattering of solar radiation affect Earth's heat budget?

02 How are energy surplus regions and energy deficit regions connected in the heat budget?

03 Which statement best describes Earth's heat budget?

04 If snow cover increases what may happen to Earth's albedo and temperature?

05 What change may occur in the heat budget when greenhouse gases increase?

06 What is one effect of absorption of solar radiation by the atmosphere?

07 Which part of solar radiation is most affected by the ozone layer?

08 Exchange of heat between Earth's surface and atmosphere is linked with what?

09 When does latent heat become important in the heat budget?

10 Why is the study of oceans useful for understanding the heat budget?

11 In which situation may Earth's average temperature tend to increase?

12 If a surface reflects more energy what will its thermal behaviour be like?

13 Why is the escape of terrestrial radiation to space necessary for Earth?

14 Which pair is correctly matched with heat budget processes?

15 What may cause less insolation to reach the ground?

16 Why is Earth's surface called both a receiver and an emitter in the heat budget?

17 Why can temperature fall quickly under a clear sky at night?

18 In which process does warm air rise from Earth's surface and carry heat upward?

19 How is water vapour active in Earth's heat budget?

20 Why can land use change affect the local heat budget?

21 Why may urban areas store more heat?

22 Despite Earth's heat budget balance why do temperatures differ from place to place?

23 Which process can reduce the receipt of solar energy in the heat budget?

24 A positive value in radiation balance generally shows which condition?

25 A negative value in radiation balance may indicate what?

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