Question 1

Which is the best summary of Earths heat budget?

Accepted Answer

Earth receives energy from the Sun and returns energy as longwave radiation Earth receives solar energy and sends energy out as terrestrial radiation. In exams this is the simple summary of heat budget.

Question 2

What is the main meaning of energy balance in heat budget?

Accepted Answer

Incoming and outgoing energy being nearly equal Heat budget compares energy coming to Earth and energy leaving it. In exams understand it as a global energy account.

Question 3

What does solar energy reaching Earths surface mainly do?

Accepted Answer

Heats the surface Solar energy absorbed by the surface warms the ground. In exams remember the surface as the base of heating.

Question 4

Why is the energy emitted by Earth called terrestrial radiation?

Accepted Answer

Because it comes from Earth Terrestrial means related to Earth and it is heat emitted by Earth. In exams understand terrestrial radiation as Earths longwave energy.

Question 5

What is the main difference between solar radiation and terrestrial radiation?

Accepted Answer

Solar radiation is shortwave and terrestrial radiation is longwave Energy from the Sun comes as shortwave and Earth emits heat as longwave. In exams remember this basic difference.

Question 6

What does reflected energy mean in heat budget?

Accepted Answer

Energy that returns back to space Reflected energy returns after striking a surface or clouds. In exams understand reflection as return of energy.

Question 7

What is the simple meaning of absorbed energy?

Accepted Answer

Energy taken in by a surface or atmosphere In absorption energy is taken in by the surface or atmosphere. In exams remember absorption as taking energy.

Question 8

How does a surface behave when its albedo is high?

Accepted Answer

It reflects more solar energy The direct answer is A: a high-albedo surface reflects more solar energy. Albedo is the fraction of incoming sunlight that a surface sends back. Step by step: sunlight reaches the surface; a high-albedo surface reflects a large part of that energy; less energy remains available for absorption and heating; therefore the surface generally warms less than a dark, low-albedo surface. Option A is correct because reflection is the meaning of high albedo. Option B is opposite: greater absorption is associated with low albedo. Option C is wrong because albedo does not convert sunlight into sound; it describes reflection. Option D is wrong because a surface cannot stop the Sun; it only reflects some incoming radiation. Snow, ice and pale clouds usually have high albedo, while dark soil, forests and oceans generally absorb more. Memory cue: high albedo = high reflection, low heating.

Question 9

What is generally true for a low albedo surface?

Accepted Answer

It absorbs more energy Low albedo means less reflection and more absorption. In exams link dark surfaces with more heating.

Question 10

How does reflection by clouds affect energy received by Earth?

Accepted Answer

Energy reaching the surface may decrease Clouds send some solar rays back to space. In exams treat clouds as an important part of heat budget.

Question 11

In the hundred unit model how much solar energy is considered absorbed by Earth and atmosphere together?

Accepted Answer

Sixty five units Out of hundred units about sixty five units are absorbed by Earth and atmosphere. In exams remember total absorption as sixty five units.

Question 12

In the hundred unit model what happens to about thirty five units of energy?

Accepted Answer

They are reflected to space About thirty five units return after reflection by clouds atmosphere and surfaces. In exams link thirty five units with reflection.

Question 13

In the hundred unit model about how much energy is absorbed by Earths surface?

Accepted Answer

Fifty one units Earths surface absorbs about fifty one units of solar energy. In exams remember the surface share as fifty one units.

Question 14

In the hundred unit model about how much energy is absorbed by the atmosphere?

Accepted Answer

Fourteen units The atmosphere directly absorbs about fourteen units of solar energy. In exams remember atmospheric absorption as fourteen units.

Question 15

If Earths surface absorbs more energy what will generally happen?

Accepted Answer

The surface temperature will rise When Earth’s surface absorbs more solar energy, its heat content and temperature generally increase. Therefore, option A is correct. A fall in temperature would be associated with lower energy absorption or greater energy loss, so option B is incorrect. Exam tip: In the heat budget, greater absorbed energy generally means surface warming.

Question 16

In which direction does energy leaving Earth go?

Accepted Answer

Toward space Outgoing energy leaves Earth and moves toward space. In exams understand it as heat going toward space.

Question 17

How do greenhouse gases affect the heat budget?

Accepted Answer

They trap some longwave heat Greenhouse gases absorb and re radiate terrestrial radiation. In exams treat them as heat trapping gases.

Question 18

Why is water vapour important in the heat budget?

Accepted Answer

It can absorb longwave radiation Water vapour is a natural greenhouse gas that helps trap heat. In exams link water vapour with heat balance.

Question 19

How does carbon dioxide work in the heat budget?

Accepted Answer

It absorbs longwave energy Carbon dioxide is a greenhouse gas and can trap terrestrial heat. In exams remember it as an important greenhouse gas.

Question 20

What is the contribution of the atmosphere in Earths heat budget?

Accepted Answer

It can absorb reflect and re radiate energy The atmosphere takes part in energy exchange in several ways. In exams see the atmosphere as an active energy layer.

Question 21

What is the effect of scattering in the atmosphere?

Accepted Answer

Solar rays spread in different directions The direct answer is A, solar rays spread in different directions. Scattering occurs when sunlight meets molecules, dust, smoke, water droplets, or other small particles in the atmosphere. The light is redirected away from its original straight path and travels in several directions. Option A is correct because it states exactly this spreading or redirection. Option B, the Sun disappears, is wrong: the Sun remains present, although atmospheric particles can make its appearance less clear. Option C, Earth’s weight decreases, is unrelated; scattering changes the direction of light, not Earth’s mass. Option D, oceans dry up, is also unrelated and does not follow from scattering. The reasoning is therefore: atmospheric particle → collision with light → change of direction → light spreads. Scattering also helps explain why the daytime sky looks blue, because shorter wavelengths are scattered more strongly, but the essential definition is spreading in different directions. Memory cue: scattering means light is scattered, not destroyed.

Question 22

How can dust and gases change incoming solar energy?

Accepted Answer

They can scatter or absorb it Atmospheric particles and gases affect the path of solar energy. In exams treat them as radiation modifiers.

Question 23

Snow areas are more associated with which process in Earths heat budget?

Accepted Answer

Reflection The direct answer is A: snow areas are strongly associated with reflection. Snow is bright and has a high albedo, meaning it sends a large part of incoming solar radiation back into the atmosphere or space. Reasoning: sunlight reaches the snow; the white surface reflects much of it; only a smaller part is absorbed; less absorbed energy means less surface heating. Option A is correct because reflection is the relevant heat-budget process. Option B is wrong because gravity formation is not the process being tested. Option C is wrong because snow does not turn solar energy into sound as a heat-budget process. Option D is wrong because ocean salinity concerns dissolved salts in seawater, not the reflection of sunlight by snow. Snow can melt when energy absorption increases, and exposed dark ground can then absorb more energy. Memory cue: white snow, high albedo, strong reflection, weak absorption.

Question 24

Dark soil is more associated with which process in heat budget?

Accepted Answer

Absorption Dark soil reflects less and takes in more energy. In exams remember dark colour by higher absorption.

Question 25

What happens later to energy absorbed by the surface?

Accepted Answer

It can be emitted as longwave radiation The surface emits absorbed energy as terrestrial radiation. In exams remember emission after absorption.

The heat budget of the earth

Practice questions

01 Which is the best summary of Earths heat budget?

02 What is the main meaning of energy balance in heat budget?

03 What does solar energy reaching Earths surface mainly do?

04 Why is the energy emitted by Earth called terrestrial radiation?

05 What is the main difference between solar radiation and terrestrial radiation?

06 What does reflected energy mean in heat budget?

07 What is the simple meaning of absorbed energy?

08 How does a surface behave when its albedo is high?

09 What is generally true for a low albedo surface?

10 How does reflection by clouds affect energy received by Earth?

11 In the hundred unit model how much solar energy is considered absorbed by Earth and atmosphere together?

12 In the hundred unit model what happens to about thirty five units of energy?

13 In the hundred unit model about how much energy is absorbed by Earths surface?

14 In the hundred unit model about how much energy is absorbed by the atmosphere?

15 If Earths surface absorbs more energy what will generally happen?

16 In which direction does energy leaving Earth go?

17 How do greenhouse gases affect the heat budget?

18 Why is water vapour important in the heat budget?

19 How does carbon dioxide work in the heat budget?

20 What is the contribution of the atmosphere in Earths heat budget?

21 What is the effect of scattering in the atmosphere?

22 How can dust and gases change incoming solar energy?

23 Snow areas are more associated with which process in Earths heat budget?

24 Dark soil is more associated with which process in heat budget?

25 What happens later to energy absorbed by the surface?

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