Solar panels are used to capture:

Sunlight and convert it to electricity

What does 'energy efficiency' mean?

Using as much energy as possible

Using less energy to do the same work

LED bulbs are better than incandescent bulbs because they:

Give the same light using less electricity

Why does burning wood or coal cause problems?

It creates smoke and pollution, harming health and the environment

Why is electricity considered useful but also dangerous?

It powers homes, schools, and industry but can harm or kill if not handled safely

It is produced from solar panels

Why does water placed in sunlight warm up faster than water in the shade?

The Sun heats the water directly, providing heat energy to it

A balloon was blown up and released. What type of energy caused it to move?

Movement energy from air rushing out of the balloon

Why does ancient Indian Vaastu Shastra place windows and courtyards strategically?

To make buildings look beautiful

To maximise natural light, wind, and heat, reducing the need for artificial energy

What happens when a diya with no oil is lit compared to one with oil?

The diya without oil burns out quickly because oil acts as fuel to sustain the flame

The one without oil burns brighter

Why can our body still function if we skip a meal?

The body stores energy and uses it when food is not available

Why should you never put your fingers or sticks into electrical sockets?

Because electricity can pass through your body causing serious injury or death

What energy chain is demonstrated by a water wheel turning when water is poured on it?

Water movement (kinetic) → Movement (mechanical)

Why are electric vehicles described as an example in the chapter?

They demonstrate that even vehicles can run on clean, non-polluting electricity

They are faster than petrol cars

Why does the chapter say energy is 'at work everywhere'? What evidence does it provide?

Humans and animals use food, vehicles use fuel, electricity powers homes, and Sun/wind/water provide clean energy—showing energy is the basis of all activity

Only electricity counts as energy

A student wants to reduce pollution at school. Which combination of energy choices from the chapter would help MOST?

Install solar panels, use LED bulbs, and switch off lights when not needed

How does the rubber band guitar activity illustrate the concept of sound energy?

Plucking rubber bands makes them vibrate, and vibrations produce sound, demonstrating that mechanical movement converts to sound energy

Sound only comes from electronic devices

The brain uses energy even while sleeping. What does this reveal about energy in living things?

Living things only need energy for physical activity

Energy is continuously used in all biological processes—even thinking, sleeping, and automatic body functions require energy

The brain creates its own energy

Why is coal-based electricity considered less desirable than solar or wind energy?

Coal burning releases smoke and harmful gases that pollute air and harm health, while solar and wind produce no such pollution

Coal electricity is less powerful

Solar energy is available only in summer

What is the relationship between sunlight, water vapour, and the water cycle, as related to solar energy?

Sunlight has nothing to do with the water cycle

The Sun's heat energy drives evaporation which powers the entire water cycle—showing that solar energy drives major natural processes

Only wind drives the water cycle

The water cycle uses electrical energy

How does the water wheel activity teach the concept of renewable energy?

Flowing water (renewable resource) turns a wheel and produces movement energy without consuming or polluting any resource

Water wheels are for decoration

Only old technology uses water wheels

A school decides to switch all lights from incandescent to LED. What is the reasoning based on the chapter's concept of energy efficiency?

LED bulbs produce the same amount of light as incandescent bulbs but use less electricity, reducing energy consumption and cost without sacrificing output

Incandescent bulbs are always better

Which safety rules for electricity are mentioned in the chapter?

Do not touch plugged-in wires or devices

Do not put fingers or objects into sockets

Do not play near electric boxes or transformers

Always use the highest-watt bulbs

Which types of energy are demonstrated through activities in the chapter?

Sound energy (rubber band guitar)

Heat energy (water in sunlight)

Movement energy (balloon experiment)

A country still depends heavily on coal for electricity. Evaluate the long-term consequences and suggest an alternative using the chapter's concepts.

Long-term coal use leads to severe air pollution, climate problems, and health issues; transitioning to solar, wind, and water energy provides clean, renewable electricity without these harms

The country should burn more coal

The chapter says ancient Indian ships used wind energy. How does this connect to modern wind energy concepts?

Both ancient ships and modern windmills harness the kinetic energy of wind; the principle is the same—converting wind movement to useful work—showing energy concepts are not new, just scaled up

Ancient ships were not efficient

If the Sun disappeared for a week, what would happen to energy availability based on the chapter?

Solar energy would stop, water cycle would be disrupted, plants would stop producing food, and many energy chains would collapse—showing the Sun is the primary source of most energy on Earth

Evaluate the Vaastu Shastra example in the chapter. How does traditional Indian knowledge relate to modern energy efficiency?

It is a superstition with no relevance

Both Vaastu Shastra and modern energy efficiency share the goal of using natural light, wind, and heat wisely—showing that sustainable thinking existed in ancient India

Vaastu Shastra contradicts science

Modern buildings ignore natural energy

A student argues that we should only use electric vehicles since they run on electricity. What is the most complete critique of this view?

While electric vehicles reduce direct pollution, their benefit depends on how the electricity is generated; if it comes from coal, pollution still occurs—clean vehicles require clean electricity sources

Electric vehicles are too expensive

Which observations from the activities prove that different forms of energy can be transformed?

Balloon releasing air shows air movement producing kinetic energy

Rubber band vibration produces sound energy

Sunlight warming water shows heat energy transfer

Electric light has no energy conversion

Which are examples of energy use in everyday life mentioned in the chapter?

Food giving energy to animals and humans

Electricity running industrial machines

Which statements correctly describe advantages of clean energy?

It does not release smoke or harmful gases

It uses renewable sources (Sun, wind, water) that are not depleted

It is not available at night (solar limitation)

It can generate electricity without pollution

Which human practices from the past show awareness of energy conservation?

Ancient ships using wind sails instead of fuel

Vaastu Shastra planning buildings for natural light and breeze

Traders using solar-powered ships in ancient times

Traditional diya using oil as fuel

NCERT Solutions Class 5 EVS Chapter 7 – Energy—How Things Work

Name: Energy—How Things Work – Class 5 EVS
Uploaded: 2026-07-24T06:14:16+00:00
Description: The chapter “Energy—How Things Work” explains what energy is, its different forms, and how it makes things move, light up, and work. It teaches about sources of energy like food, fuel, electricity, the Sun, wind, and water, and encourages the safe and wise use of clean energy in daily life.

Class 5 EVS

Last Updated: 24 July 2026

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Chapter Introduction

The chapter “Energy—How Things Work” explains what energy is, its different forms, and how it makes things move, light up, and work. It teaches about sources of energy like food, fuel, electricity, the Sun, wind, and water, and encourages the safe and wise use of clean energy in daily life.

हिंदी में (Hindi)

अध्याय “ऊर्जा—चीजें कैसे काम करती हैं” यह समझाता है कि ऊर्जा क्या है, इसके विभिन्न रूप क्या हैं, और यह चीजों को कैसे हिलाने, रोशन करने और काम करने में मदद करती है। यह भोजन, ईंधन, बिजली, सूर्य, हवा और पानी जैसे ऊर्जा स्रोतों के बारे में बताता है और दैनिक जीवन में स्वच्छ ऊर्जा के सुरक्षित और समझदारीपूर्ण उपयोग के लिए प्रोत्साहित करता है।

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Important Points

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Practice MCQ Questions (42 questions)

Q1. What does energy help things do?

Q2. What is the source of energy for all living things?

Q3. What fuels do vehicles use?

Q4. Which type of energy is produced when rubber bands in a guitar are plucked?

Q5. What is clean energy?

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Tough Words (Glossary)

Variety

Meaning: A collection of different things

अर्थ: विभिन्न चीजों का संग्रह

"There is a variety of fruits in the basket."

Activities

Meaning: Things people do

अर्थ: लोगों द्वारा किए गए कार्य

"Morning activities keep us healthy."

Observe

Meaning: To watch carefully

अर्थ: ध्यान से देखना

"We must observe safety rules."

Temperature

Meaning: Degree of hotness or coldness

अर्थ: गर्मी या ठंडक की मात्रा

"The temperature is very high today."

Sources

Meaning: Places or origins of something

अर्थ: किसी चीज़ के स्रोत

"The Sun and wind are sources of energy."

Fuel

Meaning: Material used to produce energy

अर्थ: ऊर्जा पैदा करने वाला पदार्थ

"Petrol is used as fuel in cars."

Pollution

Meaning: Presence of harmful substances in environment

अर्थ: पर्यावरण में हानिकारक पदार्थों की उपस्थिति

"Smoke causes pollution in cities."

Electricity

Meaning: Form of energy used to power devices

अर्थ: यंत्रों को चलाने वाली ऊर्जा

"Electricity lights up our homes."

Industries

Meaning: Large-scale businesses

अर्थ: बड़े पैमाने के उद्योग

"Many industries use machines."

Dangerous

Meaning: Able to cause harm

अर्थ: हानि पहुँचाने वाला

"Fire can be dangerous."

Harmful

Meaning: Causing damage or injury

अर्थ: क्षति पहुँचाने वाला

"Smoking is harmful to health."

Environment

Meaning: Natural world around us

अर्थ: हमारे चारों ओर की प्राकृतिक दुनिया

"We must protect our environment."

Nevertheless

Meaning: In spite of that

अर्थ: फिर भी

"She worked hard; nevertheless, she failed."

Generate

Meaning: To create or produce

अर्थ: बनाना या उत्पन्न करना

"Windmills generate electricity."

Solar

Meaning: Relating to the Sun

अर्थ: सूर्य से संबंधित

"Solar energy is very useful."

Panels

Meaning: Flat objects that absorb energy

अर्थ: ऊर्जा सोखने वाली समतल वस्तुएँ

"Solar panels are fixed on the roof."

Windmills

Meaning: Machines that turn wind into energy

अर्थ: हवा को ऊर्जा में बदलने वाली मशीनें

"Windmills turn with the wind."

Transformers

Meaning: Electrical equipment

अर्थ: विद्युत उपकरण

"Transformers supply power to houses."

Efficiency

Meaning: Ability to use less energy for same work

अर्थ: कम ऊर्जा में कार्य करने की क्षमता

"LED bulbs have better efficiency."

Incandescent

Meaning: Old-style light bulb

अर्थ: पुराने प्रकार का बल्ब

"Incandescent bulbs waste energy."

Fluorescent

Meaning: Type of light bulb

अर्थ: एक प्रकार का बल्ब

"Fluorescent bulbs are used in schools."

Massive

Meaning: Very large

अर्थ: बहुत बड़ा

"He saw a massive ship."

Sails

Meaning: Cloth used on ships to catch wind

अर्थ: जहाज पर हवा पकड़ने वाला कपड़ा

"Sails help ships move in the wind."

Traders

Meaning: People who buy and sell goods

अर्थ: सामान बेचने और खरीदने वाले लोग

"Traders sell goods in the market."

Architecture

Meaning: Design of buildings

अर्थ: भवन की डिज़ाइन

"The architecture of the temple is beautiful."

Courtyards

Meaning: Open central space in a building

अर्थ: भवन का खुला केंद्रीय भाग

"The house has a big courtyard."

Openings

Meaning: Spaces for doors or windows

अर्थ: दरवाजों या खिड़कियों के स्थान

"There are two openings in the wall."

Torch

Meaning: Handheld light powered by battery

अर्थ: बैटरी से चलने वाली टॉर्च

"She switched on the torch."

Batteries

Meaning: Devices storing energy

अर्थ: ऊर्जा संग्रह करने वाले यंत्र

"Batteries power the remote."

Vibrate

Meaning: Shake rapidly

अर्थ: तेज़ी से हिलना

"The strings vibrate to make sound."

Stored

Meaning: Saved for future use

अर्थ: भविष्य के लिए बचाया गया

"Food is stored in the fridge."

Resources

Meaning: Supplies we use

अर्थ: हमारे द्वारा प्रयोग की जाने वाली वस्तुएँ

"Water is our most important resource."

Waste

Meaning: Unwanted material

अर्थ: अनचाही वस्तु

"We should not waste food."

Supervision

Meaning: Guidance by elders

अर्थ: बड़ों का मार्गदर्शन

"Experiments need adult supervision."

Instructions

Meaning: Set of directions

अर्थ: निर्देशों का सेट

"Read the instructions carefully."

Balance

Meaning: Keep steady

अर्थ: स्थिर रखना

"The bridge did not balance properly."

Container

Meaning: Object used to hold things

अर्थ: चीजें रखने का पात्र

"The container is full of water."

Turbine

Meaning: Machine that produces power

अर्थ: शक्ति पैदा करने वाली मशीन

"A turbine generates electricity."

Connected

Meaning: Linked together

अर्थ: आपस में जुड़ा हुआ

"All parts are connected together."

Chain

Meaning: A series of connected things

अर्थ: आपस में जुड़ी हुई चीज़ों की श्रृंखला

"The bicycle chain was broken."

Complete

Meaning: To finish fully

अर्थ: पूरी तरह समाप्त करना

"Complete your homework on time."

Explain

Meaning: To make clear

अर्थ: स्पष्ट करना

"The teacher explained the topic."

Forward

Meaning: Ahead in direction

अर्थ: आगे की दिशा में

"Move forward to the next step."

Carefully

Meaning: With attention and safety

अर्थ: ध्यान और सुरक्षा के साथ

"Cross the road carefully."

Stretch

Meaning: Pull to full length

अर्थ: पूरा लंबा खींचना

"Stretch your arms during exercise."

Pluck

Meaning: Pick or pull quickly

अर्थ: तेज़ी से तोड़ना या खींचना

"She plucked a flower."

Vessel

Meaning: Container to hold liquid

अर्थ: तरल रखने का पात्र

"The vessel is made of clay."

Protect

Meaning: To keep safe

अर्थ: सुरक्षित रखना

"The police protect people."

Movement

Meaning: Act of changing place

अर्थ: स्थान बदलने की क्रिया

"Movement is important for exercise."

NCERT Solutions Class 5 EVS Chapter 7 – Energy—How Things Work

Chapter Introduction

Watch Video Lecture

Important Points

Practice MCQ Questions (42 questions)

Q1. What does energy help things do?

Q2. What is the source of energy for all living things?

Q3. What fuels do vehicles use?

Q4. Which type of energy is produced when rubber bands in a guitar are plucked?

Q5. What is clean energy?

Q6. Solar panels are used to capture:

Q7. Windmills use which natural source to make electricity?

Q8. What does 'energy efficiency' mean?

Q9. LED bulbs are better than incandescent bulbs because they:

Q10. What stored energy source is used in a torch or toy?

Q11. What source of energy did ancient ships use to travel across seas?

Q12. Cooking gas is an example of which type of energy source?

Q13. Why does burning wood or coal cause problems?

Q14. Why is electricity considered useful but also dangerous?

Q15. Why does water placed in sunlight warm up faster than water in the shade?

Q16. A balloon was blown up and released. What type of energy caused it to move?

Q17. Why does ancient Indian Vaastu Shastra place windows and courtyards strategically?

Q18. What happens when a diya with no oil is lit compared to one with oil?

Q19. Why can our body still function if we skip a meal?

Q20. Why should you never put your fingers or sticks into electrical sockets?

Q21. What energy chain is demonstrated by a water wheel turning when water is poured on it?

Q22. Why are electric vehicles described as an example in the chapter?

Q23. Why does the chapter say energy is 'at work everywhere'? What evidence does it provide?

Q24. A student wants to reduce pollution at school. Which combination of energy choices from the chapter would help MOST?

Q25. How does the rubber band guitar activity illustrate the concept of sound energy?

Q26. The brain uses energy even while sleeping. What does this reveal about energy in living things?

Q27. Why is coal-based electricity considered less desirable than solar or wind energy?

Q28. What is the relationship between sunlight, water vapour, and the water cycle, as related to solar energy?

Q29. How does the water wheel activity teach the concept of renewable energy?

Q30. A school decides to switch all lights from incandescent to LED. What is the reasoning based on the chapter's concept of energy efficiency?

Q31. Which are sources of clean energy mentioned in the chapter?

Q32. Which safety rules for electricity are mentioned in the chapter?

Q33. Which types of energy are demonstrated through activities in the chapter?

Q34. A country still depends heavily on coal for electricity. Evaluate the long-term consequences and suggest an alternative using the chapter's concepts.

Q35. The chapter says ancient Indian ships used wind energy. How does this connect to modern wind energy concepts?

Q36. If the Sun disappeared for a week, what would happen to energy availability based on the chapter?

Q37. Evaluate the Vaastu Shastra example in the chapter. How does traditional Indian knowledge relate to modern energy efficiency?

Q38. A student argues that we should only use electric vehicles since they run on electricity. What is the most complete critique of this view?

Q39. Which observations from the activities prove that different forms of energy can be transformed?

Q40. Which are examples of energy use in everyday life mentioned in the chapter?

Q41. Which statements correctly describe advantages of clean energy?

Q42. Which human practices from the past show awareness of energy conservation?