Chapter 7: Energy—How Things Work Application Questions | Environmental Science - EVS Class 5 CBSE

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Chapter 7: Energy—How Things Work Application Questions | Environmental Science - EVS Class 5 CBSE | ByteNotes.in

Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 1

Applied Concept

Imagine you have two damp cloths. You put one in the bright Sun and another under a tree in the shade. Which one will dry first and why?

The cloth kept in the bright Sun will dry much faster than the one in the shade.
This is because the Sun provides direct heat energy that evaporates the water from the cloth quickly.
This scenario shows how we use the Sun as a natural and free source of heat energy in our daily lives.

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Application Question

Easy difficulty • Concept in a practical situation

Easy

Question 2

Applied Concept

What would happen to your ability to play a game of football if you skipped your breakfast and lunch today?

You would likely feel very tired and lack the strength to run or kick the ball during the game.
Our bodies get the energy they need to be active from the food we eat throughout the day.
Skipping meals means your body has less fuel to work with, illustrating that food is our primary source of energy.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 3

Applied Concept

Suppose there is a power cut in your neighborhood for the entire day. List three ways your daily routine would change.

You would not be able to use electric fans or lights, making it harder to stay cool or see indoors.
Devices like televisions or computers would not work, so you would have to find different ways to learn or play.
This connection shows how heavily we depend on electrical energy to make our modern lives easy and comfortable.

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Application Question

Easy difficulty • Concept in a practical situation

Easy

Question 4

Applied Concept

You see a classmate trying to poke a metal ruler into an electric socket. Why is this dangerous and what should you do?

This is extremely dangerous because metal can conduct electricity and cause a severe electric shock to your classmate.
Electricity can be harmful if not used carefully, and sockets are meant only for proper electrical plugs.
You must immediately tell them to stop and then inform a teacher or an adult about what happened for safety.

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Application Question

Hard difficulty • Concept in a practical situation

Hard

Question 5

Applied Concept

If you are designing a toy car and want it to move without using batteries, what other energy source from the chapter could you use?

You could use the energy from moving air by attaching a balloon to the toy car like a rocket.
When the air rushes out of the balloon, it will push the car forward just like in the balloon air rocket experiment.
This shows how we can use simple mechanical energy from air movement to make things work without electricity.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 6

Applied Concept

Your family is choosing between an old incandescent bulb and a new LED bulb for your study room. Which is the better choice and why?

The LED bulb is the better choice because it is much more energy efficient than an old incandescent bulb.
It provides the same amount of light while using a lot less electricity, which helps save natural resources.
This choice follows the concept of energy efficiency, which is using less energy to do the same amount of work.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 7

Applied Concept

Why is the Cochin International Airport considered a friend of the environment compared to other airports?

It is considered eco-friendly because it uses solar panels to run all its operations instead of burning coal for power.
Since solar energy is a clean source of energy, the airport does not produce harmful smoke or waste while working.
By choosing renewable energy, the airport protects the planet, showing a great real-world application of clean energy technology.

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Application Question

Hard difficulty • Concept in a practical situation

Hard

Question 8

Applied Concept

While walking in a hilly area, you see a small mill by a stream grinding wheat into flour. How is this mill working without electricity?

This is likely a traditional watermill called a gharaat, which uses the energy from flowing water to turn its parts.
The moving water spins a wheel that is connected to the grinding stones, providing the power needed to grind the grain.
This mill is a perfect example of how people have used natural water energy for work for many years.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 9

Applied Concept

What would happen if you tried to light a cotton wick for a diya without putting any oil around it?

The cotton wick would catch fire quickly but it would burn out almost as soon as the cotton is consumed.
Without oil, there is no fuel to keep the flame burning for a long time to provide steady light.
This experiment proves that light energy in a diya requires a constant source of fuel, such as oil, to work.

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Application Question

Hard difficulty • Concept in a practical situation

Hard

Question 10

Applied Concept

If you were to stay in a traditional house in a very hot desert, how would the thick walls and small windows help you?

The thick walls would act as a shield to keep the intense heat of the desert Sun from entering the house.
Small windows would prevent hot winds from blowing inside, helping the interior stay much cooler than the air outside.
This traditional design uses knowledge of nature to keep people comfortable without needing energy-hungry machines like air conditioners.

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Chapter sections

Chapter 7: Energy—How Things Work | Application Questions

Imagine you have two damp cloths. You put one in the bright Sun and another under a tree in the shade. Which one will dry first and why?

What would happen to your ability to play a game of football if you skipped your breakfast and lunch today?

Suppose there is a power cut in your neighborhood for the entire day. List three ways your daily routine would change.

You see a classmate trying to poke a metal ruler into an electric socket. Why is this dangerous and what should you do?

If you are designing a toy car and want it to move without using batteries, what other energy source from the chapter could you use?

Your family is choosing between an old incandescent bulb and a new LED bulb for your study room. Which is the better choice and why?

Why is the Cochin International Airport considered a friend of the environment compared to other airports?

While walking in a hilly area, you see a small mill by a stream grinding wheat into flour. How is this mill working without electricity?

What would happen if you tried to light a cotton wick for a diya without putting any oil around it?

If you were to stay in a traditional house in a very hot desert, how would the thick walls and small windows help you?

Unlock all Application Questions