CBSE Class 5 EVS Energy How Things Work Worksheet Set 01

Fill in the Blanks

Question. Using __________ bulbs instead of traditional bulbs saves electricity.
Answer: LED
Explanation: LED bulbs give off lots of bright light while using very little electric power, helping our families save electricity and money.

Question. The primary source of energy for all life on Earth is __________.
Answer: Sun
Explanation: The Sun provides warmth and light so green plants can grow; all animals and humans get their energy by eating these plants.

Question. Automobiles use __________ and __________ as fuels to run.
Answer: petrol, diesel
Explanation: Cars, buses, and motorbikes burn petrol or diesel inside their engines to get the energy needed to spin their wheels.

Question. Burning of wood or coal produces __________ and __________.
Answer: smoke, pollution
Explanation: When wood or coal catches fire, it releases dark smoke and dirty gases that make the air harmful to breathe.

Question. In hilly regions, people keep their __________ on the ground floor to stay warm in winter.
Answer: cattle / domestic animals
Explanation: Cows and sheep give off natural body warmth, which rises up through the wooden ceiling to keep the family warm upstairs.

Question. Cars and scooters need __________ to keep moving.
Answer: fuel (petrol or diesel)
Explanation: Fuel is food for engines; burning it inside the engine creates the pushing force that turns the vehicle's wheels.

Question. Our brain consumes __________ even when we sit, sleep, or think.
Answer: energy
Explanation: Even when you are resting quietly, your brain works hard to keep your heart beating, lungs breathing, and thoughts flowing.

Question. __________ spins turbine to make electricity.
Answer: Water / Steam / Wind
Explanation: Fast-moving water or strong wind pushes big turbine fans, spinning a generator that creates electric current.

Question. We need __________ to do all activities in our daily life.
Answer: energy
Explanation: Energy is the invisible ability to do work; without it, we could not run, write, speak, or study.

Question. The papads are dried under the __________.
Answer: sun / sunlight
Explanation: The warm heat energy from the sun evaporates all moisture from wet dough, making the papads crisp and crunchy.

Question. __________ is an ancient Indian system that guides designing building using natural energy.
Answer: Vastu Shastra
Explanation: This traditional building system designs doors and windows to welcome maximum natural sunlight and cooling fresh breezes.

True or False

Question. Animals do not need energy to survive.
Answer: False
Explanation: All living animals need energy from food to breathe, walk, hunt, run, and keep their bodies warm.

Question. Solar panels can convert sunlight into electricity.
Answer: True
Explanation: Dark solar panels catch the bright rays of the sun and change them directly into clean electric power.

Question. Electricity should be used carefully because it can be hazardous.
Answer: True
Explanation: Electric current has a lot of power and can cause dangerous shocks or fires if handled carelessly.

Question. The polluted air is beneficial for our health and the environment.
Answer: False
Explanation: Dirty, smoke-filled air harms our lungs, causes coughing, and damages plants and trees.

Question. Electricity generated using natural sources of energy produces pollution.
Answer: False
Explanation: Generating electricity from the sun, wind, or running water is completely clean and creates zero smoke.

Question. Some automobiles run on electricity instead of petrol or diesel.
Answer: True
Explanation: Electric cars and e-rickshaws have rechargeable batteries instead of fuel tanks, so they run quietly without smoke.

Question. Sun’s heat aids to dry the clothes.
Answer: True
Explanation: Solar heat turns the water droplets trapped in wet clothes into invisible vapor, leaving your clothes completely dry.

Question. Always stand by the damaged wires and fallen electric poles.
Answer: False
Explanation: Broken electric wires can carry dangerous live current; you must always stay far away and tell an adult immediately.

Question. Well-placed openings and courtyards decrease the need for artificial energy in homes.
Answer: True
Explanation: Open central courtyards bring in plenty of sunlight and fresh air, so families do not need to keep bulbs and coolers running all day.

Question. The pinwheel spun because of water energy.
Answer: False
Explanation: A pinwheel rotates because blowing air (wind energy) pushes against its paper blades, not water.

Question. Wind energy was used to move historic ships with sails.
Answer: True
Explanation: Before motor engines were invented, sailors caught gusty ocean winds in large cloth sails to steer giant wooden ships across oceans.

Questions / Short Question Answers

Question. Describe with an example how animals use energy.
Answer: Animals, like humans, get energy from food. For example, a dog uses the energy from its food to run and play. All activities, such as flying or swimming, need energy from food.
Explanation: Just like a toy needs batteries to move, a puppy needs food energy to jump, chase balls, and wag its tail happily.

Question. How does burning coal to produce electricity damage the environment?
Answer: Burning coal produces a lot of smoke and harmful gases, which pollute the air. This polluted air is not good for our health and also harms the environment by making it dirty and unhealthy for all living beings.
Explanation: Burning coal creates heavy black smoke that dirties the fresh air, making it hard for people and birds to breathe cleanly.

Question. Why is it important to use energy wisely?
Answer: It is important to use energy carefully because some sources like fuel are limited and cause pollution. By using clean sources and saving energy, we help protect our environment and save resources for the future.
Explanation: Fuels like coal and oil take millions of years to form and will run out one day, so switching off extra lights saves them for the future.

Questions / Short Question Answers

Question. What is electricity categorized as?
(a) A kind of sound
(b) A form of energy
(c) A kind of gas
(d) A type of food
Answer: (b) A form of energy
Explanation: Electricity is an essential form of energy carried through wires to power lamps, fans, and computers.

Question. What happens when sunlight is concentrated on one spot on a paper using a magnifying glass?
Answer: The curved glass concentrates all the sunbeams and heat energy onto one tiny point, making the paper so hot that it starts to smoke and burn.
Explanation: The lens gathers widespread sunlight together like a team, creating enough focused heat energy to burn paper.

Question. Why does the oil lamp keep burning, while the lamp without oil stops quickly?
Answer: The lamp with oil continues burning because the oil acts as fuel that provides continuous energy to the flame. The dry lamp without oil goes out immediately because it has no fuel.
Explanation: Fire needs food to stay alive, and cooking or lamp oil feeds the burning wick with fuel energy.

Question. Why should we switch off devices when not in use?
(a) To make them louder
(b) To save electricity
(c) To change their colour
(d) To make them heavier
Answer: (b) To save electricity
Explanation: Turning off fans and lights when leaving an empty room saves electricity and keeps our planet greener.

Question. What causes the water wheel to start moving when you pour water on it?
Answer: Falling water has kinetic energy (motion energy). As it strikes the paddles of the wheel, it pushes them downward, causing the wheel to rotate.
Explanation: Flowing water has real pushing muscle, and that push makes the toy water wheel spin round and round.

Question. What can be done to minimize vehicle pollution in cities?
Answer: We can use electric vehicles, walk or cycle for short neighborhood trips, ride in public buses or metro trains, and practice carpooling.
Explanation: Sharing rides or riding bicycles reduces the number of smoke-blowing exhausts on city roads.

Question. Why do we feel energetic after eating food?
Answer: Food contains chemical energy. When our body digests food, it releases this energy to power our muscles, brain, and organs.
Explanation: Food is human fuel; when you eat, your body charges up like a battery so you can run and play.

Question. Where do we obtain clean energy from?
(a) From burning wood and coal
(b) From garbage and smoke
(c) From the Sun, wind, and water
(d) From firecrackers
Answer: (c) From the Sun, wind, and water
Explanation: The sun, wind, and flowing rivers produce electricity without creating any smoke, ash, or air pollution.

Question. Why does the pinwheel rotate in the breeze?
Answer: Blowing wind carries kinetic energy. When it strikes the tilted paper wings of the pinwheel, it pushes them forward, causing continuous rotation.
Explanation: Fast-moving air bumps against the curved edges of the paper, making the pinwheel twirl in the wind.

Question. What fuels are utilized in our daily lives?
Answer: Everyday fuels include cooking gas (LPG) for kitchen stoves, petrol and diesel for vehicles, and electricity for home appliances.
Explanation: Fuels give us heat to cook our yummy meals and power to travel in cars and school buses.

Question. Why does the toy balloon move when air is released?
Answer: Rushing air escaping through the neck pushes against the outside air, propelling the balloon forward in the opposite direction. This shows moving air has energy.
Explanation: The rushing air acts like a tiny rocket motor, pushing the rubber balloon through the classroom air.

Question. Which cup contains warmer water after being left outside?
Answer: The cup placed directly under the Sun contains warmer water because it absorbs solar heat energy, while the shaded cup stays cooler.
Explanation: Direct sunlight warms things up like a heater, raising the temperature of the water left out in the open.

Match the Following

Question. Match each energy tool in Column A with its working function in Column B:

Answer:
(i) Heat energy — (c) Comes from the Sun and keeps our bodies warm
(ii) Electricity — (d) Powers machines, lights, and fans to work
(iii) Pinwheel — (e) Spins around whenever blowing wind strikes it
(iv) Water wheel — (b) Spins when water flows over its blades
(v) Solar panels — (a) Captures sunlight and turns it into electricity
Explanation: Energy exists in different forms all around us: sunlight warms the earth, electricity runs our appliances, and wind and water turn spinning blades.

Vocabulary Activity - "Guess the Word"

Question. I help you cook and fry, but I send thick smoke into the sky. I am burned inside traditional chulhas and huts. What am I?
Answer: Firewood / Coal
Explanation: Burning dry wood logs provides heat for village cooking, but it fills the kitchen with smoky air pollution.

Question. I come from the blazing Sun, dry your laundry, and keep the Earth warm. What type of energy am I?
Answer: Heat Energy
Explanation: Heat energy from the sun keeps our planet from freezing into a giant ice cube!

Question. You do not plug me into the wall, but I still run. I store chemical energy inside my metallic shell for flashlights and toys. What am I?
Answer: Battery / Dry Cell
Explanation: A battery is a portable energy pocket that powers your TV remote, torch, and clock without any cords.

Question. I travel quietly through copper wires to light up bulbs, spin fans, and run computers. What am I?
Answer: Electricity
Explanation: Electricity is the clean, fast energy flowing through wall circuits to power all modern electronics.

Question. I sit on rooftops, soak up bright sunbeams, and convert sunlight into clean electric power. What am I?
Answer: Solar Panels
Explanation: Solar panels have special dark silicon cells that silently catch sunlight and make electricity without any noise or pollution.

Vocabulary Activity - "Guess the Word"

Question. Name two forms of clean energy.
Answer: Sunlight and wind
Explanation: Sunlight and wind are clean green powers that never run out and produce zero smoky air pollution.

Question. State one thing you must never do when using electricity.
Answer: Never touch wires or parts of electrical devices when they are plugged in, as it can be dangerous.
Explanation: Touching open cords or switches with wet hands allows electric shocks to pass through your body, which can hurt you badly.

Question. What does the term energy mean?
Answer: Energy is the ability to make things move, produce light or heat, do work, or create sound. We need energy in our daily lives for many activities.
Explanation: Energy is the special power that makes things work—it lights up light bulbs, makes bicycles roll, and rings your school bell.