What is the composition of air?
  • Air contains 40% nitrogen, 40% oxygen, and 20% other gases.
  • Air is composed of approximately 78% nitrogen, 21% oxygen, and 1% other gases.
  • Air is made up of 60% oxygen, 30% carbon dioxide, and 10% other gases.
  • Air consists of 50% nitrogen, 30% oxygen, and 20% other gases.
What does the windmills used to generate electricity?
  • Wind energy is converted into electricity.
  • Windmills convert water into electricity.
  • Wind energy is stored in batteries.
  • Windmills produce solar energy.
What is the primary greenhouse gas emitted by human activities?
  • Ozone (O3)
  • Carbon dioxide (CO2)
  • Methane (CH4)
  • Nitrous oxide (N2O)
How do plants primarily obtain energy?
  • By consuming soil nutrients
  • From water absorption
  • Through photosynthesis
  • By absorbing carbon dioxide
What is the main source of renewable energy?
  • Fossil fuels
  • Nuclear energy
  • Solar energy
  • Geothermal energy
Why is the village near the Western Ghats described as a place with many natural treasures?
  • It has tall buildings, busy markets, and many vehicles
  • It has factories producing goods and bright city lights
  • It has few trees, dry land, and rare animal sightings
  • It has fresh air, fertile soil, streams, and diverse living beings
Which statement best explains why taking deep breaths during a breathing exercise can help you stay healthy?
  • It stops the heart so the lungs can fully rest
  • It stores extra air in the stomach for later use
  • It brings more fresh air with oxygen into the lungs
  • It pushes more carbon dioxide into the lungs for energy
Look at the colored square grid showing the composition of air. Which gas takes up the greatest number of squares in the grid?
  • Argon takes the most squares
  • Carbon dioxide takes the most squares
  • Oxygen takes the most squares
  • Nitrogen takes the most squares
Study the step-by-step images for making a firki (pinwheel). What causes the firki to rotate when you run while holding it?
  • Force of moving air
  • Weight of the paper
  • Friction with the stick
  • Heat from your hands
What is the main purpose of rainwater harvesting in homes and buildings?
  • To store rainwater for later safe use
  • To replace all groundwater with rain
  • To increase rainfall during dry seasons
  • To clean polluted rivers and lakes
Stepwells like Bawadi or Vav helped people in dry regions mainly because they
  • used machines to create artificial rain
  • froze water to keep it clean for months
  • pumped seawater inland for farming
  • collected rain and seepage in lined trenches
A house wants to use the Sun’s energy for everyday tasks. Which option correctly matches a device with what it provides?
  • Solar panel — cools rooms using stored snow
  • Solar cooker — cooks food using sunlight heat
  • Streetlight pole — reflects sunlight at night
  • Solar water heater — freezes water into ice
Which option best explains why forests are important for animals?
  • Forests give shade from strong sunlight
  • Forests provide food and shelter to animals
  • Forests stop wind from blowing strongly
  • Forests make rivers longer and deeper
Which process best explains how soil forms over time?
  • Evaporation of water leaving salt behind
  • Solidification of magma into new rock
  • Compression of dead plants into coal
  • Disintegration of rocks by natural agents
Why do earthworms help plants grow better in garden soil?
  • They turn and loosen soil for roots
  • They eat roots to reduce crowding
  • They keep soil dry during rains
  • They add pebbles that drain water
Which rock–use pair is correctly matched?
  • Slate — used for roofing tiles
  • Marble — used mainly as road tar
  • Laterite — used for glass making
  • Granite — used only for jewellery
The jumbled name 'ocrk' likely refers to which natural resource?
  • Core
  • Cork
  • Rock
  • Crop
Which list shows only non-renewable resources?
  • Coal, petroleum, minerals
  • Forests, wind, sunlight
  • Air, water, forests
  • Sunlight, water, wind
Which statement best explains why regrowing forests is difficult?
  • Seeds never germinate naturally
  • Trees need no soil nutrients
  • Trees take many years to mature
  • Forests do not need water
Which daily action would reduce the use of natural resources the most?
  • Keeping the tap running while brushing
  • Walking short distances instead of driving
  • Using plastic bags for every purchase
  • Leaving lights on during the day
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