Homework Practice

Printable assignment

Final Assessment: Earth as a System: Energy, Matter & Life

Section A: Foundations

Question 1mcq

Why is Earth called a system?

A.Matter never moves between spheres.

B.Its spheres exchange matter and energy with one another.

C.Only the biosphere affects climate.

D.Each sphere works completely alone.

Question 2mcq

Why do dark urban roads become hotter than nearby light surfaces on sunny days?

A.They absorb more solar radiation and reflect less.

B.They transmit all radiation into space.

C.They create sunlight inside them.

D.They are unaffected by surface colour.

Question 3mcq

Why can sunlight travel from the Sun to Earth while ordinary sound cannot?

A.Sound is faster than light in space.

B.Light is a liquid.

C.Sound has no wavelength.

D.Light is electromagnetic radiation and can travel through vacuum.

Question 4mcq

If two electromagnetic waves travel at the same speed and wave A has higher frequency, what must be true?

A.Wave A stops travelling.

B.Wave A must be sound.

C.Wave A has shorter wavelength.

D.Wave A has no wavelength.

Question 5mcq

What is the best interpretation of light being a fast-moving electromagnetic radiation?

A.It carries only matter, not energy.

B.It carries energy from the Sun to Earth at a very high speed.

C.It is slower than wind.

D.It can move only through solids.

Question 6mcq

How does Earth’s tilt contribute to seasons?

A.It changes the angle and duration of sunlight received by each hemisphere.

B.It changes the chemical formula of air.

C.It makes all places receive equal sunlight.

D.It stops Earth’s rotation.

Section B: Core Processes

Question 7mcq

Why can replacing forests with concrete increase local temperature?

A.Concrete produces oxygen at night.

B.Temperature is unrelated to surface type.

C.Forests reflect no sunlight ever.

D.Concrete and dark built surfaces can absorb and retain more heat.

Question 8mcq

Which chain correctly explains wind formation?

A.Rainfall

\rightarrow

no air movement

\rightarrow

wind

B.Sunlight

\rightarrow

atoms vanish

\rightarrow

breeze

C.Uneven heating

\rightarrow

pressure difference

\rightarrow

air movement

D.Equal heating

\rightarrow

no pressure difference

\rightarrow

strong wind always

Question 9mcq

A coastal student observes cool air moving from the sea in the afternoon. Which explanation is best?

A.The breeze is unrelated to heating differences.

B.The land is warmer, so rising air over land draws in cooler sea air.

C.The sea has no air above it.

D.The land is colder than sea in every afternoon.

Question 10mcq

Which option correctly completes this statement: Mountain breeze commonly occurs at night because?

A.Cool dense air flows downslope into valleys.

B.Gravity has no effect on air movement.

C.Valleys stop containing air.

D.Warm air always flows downhill at night.

Question 11mcq

Which option correctly completes this statement: Climate is best described as?

A.The formula of water.

B.A single rain shower.

C.A one-hour change in wind direction.

D.Long-term pattern of weather in a region.

Question 12mcq

Which sequence correctly represents part of the water cycle?

A.Photosynthesis

\rightarrow

digestion

\rightarrow

respiration only

B.Ionisation

\rightarrow

formula writing

\rightarrow

valency

C.Evaporation

\rightarrow

condensation

\rightarrow

precipitation

D.Combustion

\rightarrow

rusting

\rightarrow

melting

Section C: Calculations and Applications

Question 13mcq

How can large-scale deforestation affect the carbon cycle?

A.It increases photosynthesis by removing leaves.

B.It can reduce carbon dioxide uptake by plants.

C.It removes all carbon from Earth.

D.It stops respiration in all animals.

Question 14mcq

Why is the nitrogen cycle important for living organisms?

A.Nitrogen is needed to make proteins and nucleic acids.

B.Nitrogen is used only to make glass.

C.Nitrogen replaces water in cells.

D.Living organisms never contain nitrogen.

Question 15mcq

Which process uses oxygen from air?

A.Evaporation

B.Nitrogen fixation only

C.Condensation

D.Respiration

Question 16mcq

How can excessive fertiliser use affect Earth systems?

A.It removes all nitrogen from soil instantly.

B.It has no effect outside farms.

C.It can pollute water bodies and disturb aquatic life.

D.It stops the water cycle completely.

Question 17mcq

In an energy-flow map for solar heating, arrows should mainly show?

A.Mass changing into chemical symbols only

B.Energy moving from the Sun to Earth surfaces and atmosphere.

C.Sound moving through vacuum

D.Valency changing into velocity

Question 18mcq

A student compares black paper and white paper under the same lamp. What is a suitable hypothesis?

A.Black paper will warm more because it absorbs more radiation.

B.Both papers will have no temperature change.

C.The lamp will cool the papers.

D.White paper will become nitrogen.

Section D: Full Chapter Readiness

Question 19mcq

Deforestation on a hill slope leads to soil erosion and muddy water in a nearby river. Which Earth spheres are clearly interacting in this situation?

A.Only the geosphere

B.Only the hydrosphere and cryosphere

C.Only the atmosphere and cryosphere

D.Biosphere, geosphere and hydrosphere

Question 20mcq

On a sunny winter day, fresh snow remains cooler than nearby dark soil. What is the best reason?

A.Snow absorbs all sunlight, while soil reflects all sunlight.

B.Both surfaces receive no solar radiation in winter.

C.Snow reflects more sunlight, while dark soil absorbs more sunlight.

D.Dark soil cools because it has no contact with air.

Question 21mcq

How does most solar energy reach Earth from the Sun through space?

A.As sound waves travelling through vacuum

B.As electromagnetic radiation

C.Only by conduction through air

D.Only by ocean currents

Question 22mcq

For electromagnetic waves travelling at the same speed, what happens when frequency increases?

A.Wavelength decreases.

B.Wavelength becomes infinite.

C.Speed becomes zero.

D.The wave stops carrying energy.

Question 23mcq

Which statement best explains why sunlight can reach Earth across space?

A.Light needs soil particles to move from the Sun to Earth.

B.Light travels only through water vapour.

C.Light reaches Earth only because air fills all of space.

D.Light is a fast-moving electromagnetic radiation that can travel through vacuum.

Question 24mcq

Why do polar regions generally receive less heating than equatorial regions?

A.Polar regions receive only sound waves from the Sun.

B.The Sun produces less energy when shining on the poles.

C.Sunlight reaches the poles at a slant and spreads over a larger area.

D.The equator reflects all incoming sunlight.