CBSE Class 5 EVS Energy How Things Work Worksheet Set 02

Fill in the Blanks

Question. A rotating fan uses __________ energy.
Answer: Movement (Mechanical)
Explanation: The electric motor spins the fan blades quickly; this energy of moving parts is called movement or mechanical energy.

Question. We get energy from the __________ we consume.
Answer: Food
Explanation: Just like petrol powers a motorcycle, the nutrients in healthy food give our bodies the strength to run, study, and play.

Question. The primary source of energy on Earth is the __________.
Answer: Sun
Explanation: Sunlight gives warmth and light to the whole planet, helping crops grow and keeping Earth from turning into a ball of ice.

Question. Solar cells convert sunlight into __________.
Answer: Electricity
Explanation: Shiny dark solar panels on rooftops absorb bright sunbeams and change them quietly into clean electric power.

Question. A water wheel rotates using the flow of __________.
Answer: Water
Explanation: Rushing river water pushes against the paddles of the wheel, using water power to spin heavy millstones or machinery.

Question. A stretched string in guitar produces __________ energy.
Answer: Sound
Explanation: Plucking a tight string makes it vibrate very fast, and these rapid vibrations travel through the air as musical notes.

Question. Polluted air is harmful for our __________ and the environment.
Answer: health
Explanation: Breathing in toxic vehicle exhaust and factory smoke causes coughing, eye irritation, and lung diseases.

Question. Burning coal or firewood produces a lot of smoke.
Answer: smoke
Explanation: Solid fossil fuels leave behind thick black clouds of soot and ash when they burn in traditional stoves or power plants.

Question. Electricity has made our daily routines __________.
Answer: easy
Explanation: With a flick of a wall switch, electric power instantly runs washing machines, bulbs, mixers, and water pumps for us.

Question. The energy stored in petrol and diesel is termed __________ energy.
Answer: Fuel (Chemical)
Explanation: Chemical energy stays safely locked inside liquid fuel until it catches fire inside a car engine to push the pistons.

True or False

Question. Coal is an eco-friendly source of energy.
Answer: False
Explanation: Coal produces heavy black soot, carbon dioxide, and air pollution when burned, making it a dirty fossil fuel.

Question. The Sun is the largest source of energy on Earth.
Answer: True
Explanation: Almost all natural energy—including wind, plants, rain cycles, and solar power—originates from the Sun's heat and light.

Question. Windmills spin with the breeze to produce water.
Answer: False
Explanation: Windmills turn in the wind to generate clean electricity or grind grain, not to create water.

Question. Clean energy can damage the environment.
Answer: False
Explanation: Renewable energy from the sun, flowing rivers, and gusty winds produces electricity without releasing dirty smoke or poisons.

Question. Energy is solely needed when we play.
Answer: False
Explanation: Our body needs energy every second—even while sleeping—to pump blood, breathe air, and keep our brain thinking.

Question. Solar energy can be utilized to cook food.
Answer: True
Explanation: Solar cookers use mirrors and shiny boxes to trap sun heat and bake rice, lentils, and vegetables without gas or firewood.

Question. Wind energy can be utilized to produce electricity.
Answer: True
Explanation: Giant wind turbines mounted on open hilltops spin in strong breezes to power electric generators.

Question. Electricity can be hazardous if not used properly.
Answer: True
Explanation: Electric current carries high voltage and can deliver painful shocks or cause fires if cords or plugs are mishandled.

Question. A water wheel requires electricity to turn.
Answer: False
Explanation: A water wheel turns naturally using the force of flowing river water, needing no electrical wires at all.

Question. Food provides us with no energy.
Answer: False
Explanation: Food is the fuel that our digestive system breaks down to power all our muscles, nerves, and growth.

Questions / Short Question Answers

Question. What happens when you place a damp cloth in the Sun?
(a) It freezes
(b) It damaged
(c) It dries
(d) It melts
Answer: (c) It dries
Explanation: Heat energy from the sun warms the wet cloth and evaporates the trapped water into invisible water vapor.

Question. Why is it important to utilize clean energy like solar or wind energy?
Answer: Clean energy from the sun and wind produces zero smoke or toxic fumes, helping to keep our skies clear and conserving limited fossil fuels for future generations.
Explanation: Unlike coal and petrol, sunlight and wind never run out and never release black smoke into the lungs of people and animals.

Question. Select the option that functions without electricity.
(a) Fan
(b) Bulb
(c) Papad drying in the Sun
(d) Television
Answer: (c) Papad drying in the Sun
Explanation: Drying papads uses direct solar heat from the sky, requiring no wires, batteries, or wall plugs.

Question. How do people in chilly areas stay warm without using electricity?
Answer: They wear thick woollen and sheepskin clothes, design houses with thick insulating wooden walls, use charcoal fire pots, and keep farm cattle on the ground floor so animal body heat warms the rooms above.
Explanation: In snowy mountains, animal warmth and thick woollen blankets keep homes cozy naturally without electric space heaters.

Question. What damages our health and environment?
(a) Fresh air
(b) Burning coal
(c) Clean energy
(d) Windmills
Answer: (b) Burning coal
Explanation: Coal smoke contains toxic soot and gases that pollute city air, trigger asthma attacks, and create acid rain.

Question. What is sound energy? State one example from daily life.
Answer: Sound energy is energy produced by vibrating matter that travels through air or liquids to our ears. Example: the ringing sound of a brass school bell or an alarm clock.
Explanation: Whenever an object trembles or shakes back and forth rapidly, it pushes air ripples that your ears hear as sound.

Question. Vaastu Shastra assists planning buildings with:
(a) Colour
(b) Nature
(c) Furniture
(d) Vehicles
Answer: (b) Nature
Explanation: Vaastu Shastra is an ancient Indian architectural guide that positions doors and windows to catch natural sunlight and cooling cross-breezes.

Question. How does energy assist in cooking food?
Answer: Heat energy from kitchen stoves boils water, melts butter, softens raw grains and vegetables, and kills bacteria, making food delicious and safe to eat.
Explanation: Without heat energy, raw grains like rice and wheat cannot soften into fluffy meals that our stomachs can digest.

Question. Identify the fuel utilized for cooking.
(a) Water
(b) Petrol
(c) Cooking gas
(d) Electricity
Answer: (c) Cooking gas
Explanation: Liquefied petroleum gas (LPG) supplied in metal cylinders burns with an odorless, hot blue flame perfect for cooking stoves.

Question. How can children help conserve energy in daily life? State examples.
Answer: Children can switch off lamps and fans when stepping out of rooms, open curtains to read by daylight, walk or cycle to nearby shops, and turn off televisions instead of leaving them on standby.
Explanation: Small daily habits, like flicking off an unneeded switch, save lots of coal and fuel at electrical power plants.

Question. Electricity can be produced from fast-moving:
(a) People
(b) Cars
(c) Rivers
(d) Animals
Answer: (c) Rivers
Explanation: Water rushing down dams possesses immense speed and force that spins heavy hydro-turbines to generate clean electricity.

Question. Compare fuel energy and solar energy with two contrasts.
Answer:
1. Solar energy is completely renewable and will never run out, whereas fossil fuels (like coal and petrol) exist in limited quantities underground.
2. Solar energy creates zero smoke and leaves the air fresh, while burning fuels produces dark smoke and harmful pollution.
Explanation: Sunlight is a clean and infinite gift of nature, while fossil fuels are dirty, smoky, and take millions of years to form.

Match the Following

Question. Match each energy source or tool in Column A with its natural working feature in Column B:

Answer:
(i) Sun — (d) Earth's primary source of natural heat and light
(ii) Windmill — (c) Produces electricity by spinning with gusty air
(iii) Water wheel — (b) Rotates when river currents flow over its paddles
(iv) Coal — (e) Fossil fuel that produces soot and smoke when burned
(v) Solar panel — (a) Captures sunbeams to generate clean electricity
Explanation: Different tools harness natural energy: solar panels capture sun rays, windmills catch breezes, and water wheels use river currents to do useful work.

Vocabulary Activity - "Guess the Word"

Question. I am not food, but I help cook your meal. Too much of me makes the air unclean. Sometimes I am gas, sometimes wood or coal. Who am I?
Answer: Fuel
Explanation: Any flammable material that is burned in stoves, ovens, or engines to release heat energy is called a fuel.

Question. WLEEHINP: I am a toy that twirls around when the breeze blows. What am I?
Answer: Pinwheel
Explanation: A pinwheel has light, folded paper sails that spin around a pin whenever you run or blow air onto them.

Question. You see me rise, I shine so bright, I warm your day and give you daylight. I dry your clothes and am the greatest energy source since time began! Who am I?
Answer: The Sun
Explanation: The blazing Sun sits at the center of our solar system and bathes our planet in warmth and daylight every morning.

Question. OACL: I am a black sedimentary rock mined from deep underground to produce electricity. What am I?
Answer: Coal
Explanation: Coal was formed millions of years ago from ancient squashed swamp forests buried under deep rock layers.

Question. What is the world's premier airport to be entirely powered by solar energy?
Answer: Cochin International Airport (Kerala, India)
Explanation: This green airport in Kerala uses thousands of ground solar panels to produce all the electricity needed for airplanes and terminal buildings [2].

Question. EULF: I am stored chemical energy burned in engines and stoves to release power. What am I?
Answer: Fuel
Explanation: Substances like petrol, diesel, and natural gas hold chemical energy that turns into motion and heat when ignited.

Question. LOULPTE: To make clean natural air and water dirty with smoke and waste. What verb am I?
Answer: Pollute
Explanation: Releasing dirty smoke, toxic chemicals, or plastic rubbish into our pure environment pollutes the earth.