Question 1

If total reflection is thirty five units how much energy remains in the Earth system?

Accepted Answer

Sixty five units After thirty five units are reflected from hundred units sixty five units remain absorbed. Use simple subtraction in exams.

Question 2

Under which condition can the albedo of the Earth system increase?

Accepted Answer

When cloud and snow cover increase Direct answer: Option A, Earth’s albedo can increase when cloud and snow cover increase. Albedo means the fraction of incoming sunlight reflected back by a surface or by the Earth system. Step by step: snow is bright and highly reflective; clouds can reflect a substantial amount of sunlight; increasing these reflective components sends more solar energy back to space; the reflected fraction rises, so albedo increases. Option A is correct. Option B is wrong in the usual comparison because increasing dark surfaces generally lowers reflectivity and therefore lowers albedo. Option C is not the best answer: increased absorption by forests describes more energy taken in, not increased reflection; it would generally not raise albedo. Option D is wrong or insufficient because greater ocean depth by itself does not necessarily make the Earth system more reflective, and ocean water is generally dark compared with snow. The exact effect of clouds can vary with their type, thickness, altitude, and lifetime, but the textbook relationship between increased snow/cloud cover and higher albedo is valid. Memory cue: bright snow and reflective clouds send sunlight back.

Question 3

If snow cover decreases what change is possible in the local heat budget?

Accepted Answer

Albedo will decrease and absorption may increase When snow is removed darker surfaces can absorb more energy. Link snow cover decrease with higher absorption in exams.

Question 4

What is the importance of the atmospheric window in the heat budget?

Accepted Answer

Some longwave energy can escape directly to space The atmospheric window explains direct escape of longwave energy. In exams link it with seventeen units of direct outgoing energy.

Question 5

How does the greenhouse effect influence balance in Earths heat budget?

Accepted Answer

It slows loss of longwave energy and helps keep the surface warm Greenhouse gases absorb and radiate back terrestrial radiation. Link greenhouse effect with longwave energy in exams.

Question 6

What does positive net radiation mean in the heat budget?

Accepted Answer

Incoming energy is greater than outgoing energy Positive net radiation shows energy surplus and possible warming. In exams link positive with energy gain.

Question 7

What does negative net radiation indicate in the heat budget?

Accepted Answer

Outgoing energy is greater than incoming energy Negative net radiation shows energy deficit and possible cooling. In exams link negative with energy loss.

Question 8

What is the main difference between day and night in local heat budget?

Accepted Answer

Day has solar input and night mainly has terrestrial output Shortwave energy arrives by day while longwave loss dominates at night. Understand day and night as different energy situations.

Question 9

Why is heat transferred from low latitudes to high latitudes in the heat budget?

Accepted Answer

To balance energy surplus and deficit Low latitudes have surplus and high latitudes have deficit. In exams consider atmosphere and oceans as means of heat transport.

Question 10

Which region is generally more likely to have an annual energy surplus?

Accepted Answer

Equatorial low latitudes Sun rays fall more directly at low latitudes. In exams link low latitudes with greater solar energy.

Question 11

In which region is energy deficit generally more evident?

Accepted Answer

High latitude polar regions At high latitudes rays are oblique and reflection can be high. Link poles with energy deficit in exams.

Question 12

If latitudinal heat transfer did not occur what problem could increase in low latitudes?

Accepted Answer

Tendency of excessive warming Energy surplus could accumulate in low latitudes. In exams treat heat transfer as a means of global balance.

Question 13

If global heat transfer did not occur what effect would happen at high latitudes?

Accepted Answer

Cooling and energy deficit could become stronger Heat transport reduces energy deficit at high latitudes. Link polar temperature with global heat transport in exams.

Question 14

How do ocean currents contribute to the heat budget?

Accepted Answer

They redistribute heat through warm and cold water Currents carry heat over long distances in oceans. In exams link ocean currents with heat transport.

Question 15

Atmospheric circulation is important in the heat budget for which role?

Accepted Answer

Distribution of heat by air masses Atmospheric circulation moves warm and cold air. Treat it as reducing energy inequality in exams.

Question 16

Under which condition is the surface likely to emit more longwave radiation?

Accepted Answer

The surface is warmer A warmer surface emits more terrestrial radiation. Remember the relation between surface temperature and longwave emission.

Question 17

What is the relation between surface warming and outgoing radiation in the heat budget?

Accepted Answer

Longwave outgoing radiation may increase when surface warms A warmer surface emits more energy which supports balance. Remember this feedback mechanism in exams.

Question 18

Why can local net radiation decrease when clouds increase during the day?

Accepted Answer

Reflection of incoming shortwave energy increases During daytime clouds can send more solar energy back. In exams treat daytime clouds as reducing net energy.

Question 19

Why can net energy loss decrease when clouds increase at night?

Accepted Answer

Clouds counter radiate longwave energy Clouds absorb terrestrial heat and send part of it back. Link cloudy nights with less energy loss in exams.

Question 20

Why is it necessary to study surface and atmosphere together in the heat budget?

Accepted Answer

Radiation and energy are exchanged between both The surface absorbs and emits energy and the atmosphere receives part of it. Treat them as a combined energy system in exams.

Question 21

Which change can reduce Earths average energy gain?

Accepted Answer

Increase in global albedo Higher global albedo sends more solar energy back. Link albedo increase with lower energy gain in exams.

Question 22

Which change can increase absorbed energy in the Earth system?

Accepted Answer

Decrease in reflection When reflection decreases more energy can remain in the Earth system. Remember the inverse relation between reflection and absorption.

Question 23

Why can Earths surface be called a major converter of energy in the heat budget?

Accepted Answer

It absorbs shortwave solar energy and converts it into longwave terrestrial energy The surface receives incoming solar energy and then emits terrestrial radiation. Treat the surface as an energy conversion centre in exams.

Question 24

If the atmosphere absorbs more longwave energy what effect may occur near the surface?

Accepted Answer

Heat retention may increase More longwave absorption can strengthen the greenhouse effect. Link longwave absorption with heat retention in exams.

Question 25

Why is the main direction of reflected solar energy and outgoing terrestrial energy considered similar?

Accepted Answer

Both finally move toward space Both reflected solar and outgoing terrestrial energy leave the Earth system. Treat them as parts of total outgoing energy in exams.

The heat budget of the earth

Practice questions

01 If total reflection is thirty five units how much energy remains in the Earth system?

02 Under which condition can the albedo of the Earth system increase?

03 If snow cover decreases what change is possible in the local heat budget?

04 What is the importance of the atmospheric window in the heat budget?

05 How does the greenhouse effect influence balance in Earths heat budget?

06 What does positive net radiation mean in the heat budget?

07 What does negative net radiation indicate in the heat budget?

08 What is the main difference between day and night in local heat budget?

09 Why is heat transferred from low latitudes to high latitudes in the heat budget?

10 Which region is generally more likely to have an annual energy surplus?

11 In which region is energy deficit generally more evident?

12 If latitudinal heat transfer did not occur what problem could increase in low latitudes?

13 If global heat transfer did not occur what effect would happen at high latitudes?

14 How do ocean currents contribute to the heat budget?

15 Atmospheric circulation is important in the heat budget for which role?

16 Under which condition is the surface likely to emit more longwave radiation?

17 What is the relation between surface warming and outgoing radiation in the heat budget?

18 Why can local net radiation decrease when clouds increase during the day?

19 Why can net energy loss decrease when clouds increase at night?

20 Why is it necessary to study surface and atmosphere together in the heat budget?

21 Which change can reduce Earths average energy gain?

22 Which change can increase absorbed energy in the Earth system?

23 Why can Earths surface be called a major converter of energy in the heat budget?

24 If the atmosphere absorbs more longwave energy what effect may occur near the surface?

25 Why is the main direction of reflected solar energy and outgoing terrestrial energy considered similar?

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