Question 1

What can be the double role of clouds in heat budget?

Accepted Answer

They can reflect solar energy and trap terrestrial heat Clouds may help reflection in daytime and heat trapping at night. Exam tip: remember the dual role of clouds.

Question 2

Why may surface temperature be lower during the day when there are many clouds?

Accepted Answer

Because clouds reflect part of solar energy Clouds can reduce the energy reaching the surface. Exam tip: connect cloudy day with lower insolation.

Question 3

Why are cloudy nights often less cold?

Accepted Answer

Because clouds return some heat emitted by Earth Clouds can trap longwave radiation and send it back downward. Exam tip: connect cloudy night with heat retention.

Question 4

Absorption of solar energy by the surface warms what?

Accepted Answer

Surface and nearby air The heated surface also warms the air above it. Exam tip: connect surface heating with the lower atmosphere.

Question 5

Why are oceans important in the heat budget?

Accepted Answer

They absorb and store a large amount of heat Oceans are major parts of Earth’s heat budget because water has a strong capacity to absorb and store heat. The upper ocean receives solar energy, and ocean currents move that energy from warmer regions toward cooler regions. Because water releases stored heat gradually, oceans help reduce extreme temperature differences between day and night and between seasons or places. They therefore influence the exchange and distribution of heat in the Earth system.

Option A is correct because it identifies heat absorption and storage, the central reason for the oceans’ importance. Oceans do not give energy to the Sun or remove the atmosphere. They also do not always stop radiation; sunlight enters the ocean and is partly absorbed. The key idea is that oceans act as large heat reservoirs and slowly return energy to the atmosphere and surrounding regions.

Question 6

What is the main reason Earth's average temperature remains stable for a long time?

Accepted Answer

Balance of energy gain and energy loss When incoming and outgoing energy are nearly equal the average temperature stays stable. Exam tip: connect average temperature with heat balance.

Question 7

Some solar radiation going directly back to space is an example of which process?

Accepted Answer

Reflection In reflection energy returns after striking a surface or cloud. Exam tip: connect reflected energy with albedo.

Question 8

Why does the atmosphere absorb longwave energy emitted by Earth?

Accepted Answer

Due to greenhouse gases Greenhouse gases are active toward longwave radiation. Exam tip: connect longwave absorption with greenhouse gases.

Question 9

What is the main difference between insolation and terrestrial radiation?

Accepted Answer

Insolation comes from the Sun and terrestrial radiation is emitted by Earth Direct answer: Option A, insolation comes from the Sun and terrestrial radiation is emitted by Earth. First learn the direction: ‘insolation’ means incoming solar radiation received by Earth, while terrestrial radiation means outgoing long-wave or infrared radiation emitted by the warmed Earth. Step by step: the Sun, being much hotter, sends mainly short-wave energy toward Earth; Earth absorbs part of it, becomes warm, and then releases energy mainly as long-wave infrared radiation. Option A is correct because it identifies both the source and direction. Option B is wrong: neither term means radiation coming only from the Moon. Option C is wrong because these are forms of radiation, not sea waves. Option D is wrong because both processes are directly connected with heating and temperature. A useful exam cue is to remember incoming versus outgoing: insolation enters, terrestrial radiation leaves. The exact wavelengths are not identical, but the essential difference tested here is source and direction.

Question 10

In which condition can a local area have heat surplus?

Accepted Answer

When energy gain is greater than energy loss When energy gain is greater the area becomes relatively warmer. Exam tip: connect surplus with warming.

Question 11

In which condition can a local area have heat deficit?

Accepted Answer

जब ऊर्जा की हानि ऊर्जा की प्राप्ति से अधिक हो A local heat deficit occurs when the energy lost from an area is greater than the energy it receives. This produces a net energy loss and tends to lower temperature. Equal energy gain and loss indicate heat balance, not a deficit. Exam tip: heat deficit means energy loss > energy gain.

Question 12

Which of the following is a part of Earth's heat budget?

Accepted Answer

Absorption of solar energy Absorption of solar energy is a major process of heat balance. Exam tip: connect heat budget with radiation processes.

Question 13

What is the role of the atmosphere in Earth's heat budget?

Accepted Answer

Absorbing reflecting and re-radiating energy The atmosphere plays an active role in energy exchange. Exam tip: treat the atmosphere as a heat regulator.

Question 14

Why is heat distribution not the same everywhere on Earth?

Accepted Answer

Because insolation varies with latitude surface and clouds The amount of insolation changes due to different factors. Exam tip: treat unequal heating as a key geographical cause.

Question 15

Why is solar energy less effective at higher latitudes?

Accepted Answer

Because sun rays fall obliquely Oblique rays spread over a larger area and energy is less concentrated. Exam tip: connect angle of incidence with heat budget.

Question 16

Why do low latitudes generally receive more heat?

Accepted Answer

Because sun rays are more direct Direct rays concentrate energy over a smaller area. Exam tip: connect tropics with high insolation.

Question 17

Why is energy going back to space necessary in heat budget?

Accepted Answer

So that Earth does not become extremely hot If energy does not leave temperature may keep rising. Exam tip: connect outgoing energy with cooling role.

Question 18

Which layer affects solar radiation before it reaches Earth's surface?

Accepted Answer

Atmosphere The atmosphere absorbs reflects and scatters solar radiation. Exam tip: understand the atmosphere as the first filter.

Question 19

Which option shows the correct sequence of heat budget?

Accepted Answer

Energy comes from Sun surface heats Earth emits energy In heat budget solar energy arrives and Earth emits longwave energy. Exam tip: remember the incoming to outgoing sequence.

Question 20

How does surface colour affect the heat budget?

Accepted Answer

Dark surfaces absorb more and bright surfaces reflect more Surface colour affects albedo and absorption. Exam tip: connect colour with absorption and reflection.

Question 21

Why does Earth not become completely cold?

Accepted Answer

Because it continuously receives energy from the Sun Continuous energy input from the Sun keeps Earth warm. Exam tip: remember continuous solar input.

Question 22

Why is Earth's surface considered a very active part in heat budget?

Accepted Answer

Because it absorbs energy and then radiates it The surface receives solar energy and emits terrestrial radiation. Exam tip: understand the surface as both receiver and emitter.

Question 23

What is the simplest conclusion of the heat budget?

Accepted Answer

Earth's energy input and output together create temperature balance Heat budget is the basic idea of Earth's temperature balance. Exam tip: treat it as a basic process of climate.

Question 24

What is the most common effect of solar energy reaching Earth's surface?

Accepted Answer

Ground and lower air get heated The surface absorbs solar energy and also warms the nearby air. Exam tip: treat the ground as the main receiver of heat.

Question 25

In the heat budget the account of energy is mainly formed by which things?

Accepted Answer

Received reflected and emitted energy Heat budget includes incoming energy reflection absorption and outgoing energy. Exam tip: understand it like an energy account.

The heat budget of the earth

Practice questions

01 What can be the double role of clouds in heat budget?

02 Why may surface temperature be lower during the day when there are many clouds?

03 Why are cloudy nights often less cold?

04 Absorption of solar energy by the surface warms what?

05 Why are oceans important in the heat budget?

06 What is the main reason Earth's average temperature remains stable for a long time?

07 Some solar radiation going directly back to space is an example of which process?

08 Why does the atmosphere absorb longwave energy emitted by Earth?

09 What is the main difference between insolation and terrestrial radiation?

10 In which condition can a local area have heat surplus?

11 In which condition can a local area have heat deficit?

12 Which of the following is a part of Earth's heat budget?

13 What is the role of the atmosphere in Earth's heat budget?

14 Why is heat distribution not the same everywhere on Earth?

15 Why is solar energy less effective at higher latitudes?

16 Why do low latitudes generally receive more heat?

17 Why is energy going back to space necessary in heat budget?

18 Which layer affects solar radiation before it reaches Earth's surface?

19 Which option shows the correct sequence of heat budget?

20 How does surface colour affect the heat budget?

21 Why does Earth not become completely cold?

22 Why is Earth's surface considered a very active part in heat budget?

23 What is the simplest conclusion of the heat budget?

24 What is the most common effect of solar energy reaching Earth's surface?

25 In the heat budget the account of energy is mainly formed by which things?

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