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

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

Long Answer

Medium difficulty • Structured explanation

Medium

Question 1

Long Form

Describe the different forms of energy we see in a kitchen and how they work.

A kitchen is a great place to observe energy because many activities happen there at once.
We see heat energy being used to cook food on a stove or gas burner.
Light energy is present when we turn on a bulb to see what we are cooking.
Electrical energy might power a mixer or a chimney to help with kitchen work.
For example, when food is getting cooked in a pan, heat energy is changing the raw food into a meal.

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Long Answer

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Medium

Question 2

Long Form

Explain the balloon air rocket activity and what it teaches us about energy.

This activity involves filling a balloon with air and taping it to a straw on a string.
When you release the mouth of the balloon, the air rushes out in one direction.
This movement of air creates a force that pushes the balloon forward along the string.
It teaches us that air movement can generate energy to make objects move.
A classroom example is watching the balloon zoom across the string as soon as you let go of its mouth.

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Long Answer

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Question 3

Long Form

Describe how to make a rubber band guitar and the type of energy it produces.

To make this, you stretch rubber bands around a cardboard box with a hole in it.
You can place a pencil under the bands at one end to lift them up.
When you pluck the bands with your fingers, they begin to vibrate rapidly.
These vibrations produce sound energy that we can hear with our ears.
An everyday example is how the thin rubber bands make a different sound than thicker ones when plucked.

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Long Answer

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Question 4

Long Form

Outline the experiment to show how sunlight gives us heat energy using cups of water.

In this activity, you fill two identical cups with the same amount of water.
One cup is placed in direct sunlight and the other is kept in the shade.
After waiting for about 15 to 20 minutes, you touch the water in both cups.
The water in the sun feels much warmer because it absorbed the Sun's heat energy.
This simple test proves that the Sun is a powerful source of heat that can change water temperature.

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Long Answer

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Question 5

Long Form

Explain why living things need energy and how they obtain and store it.

Living things like humans and animals need energy for every movement and body function.
We get this essential energy from the food we eat every day.
Even when we are sleeping or just thinking, our brain is busy using up energy.
Our bodies are clever and can store extra energy for later use when we are active.
For example, we can still run in the playground even if we haven't eaten a meal recently because of stored energy.

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Long Answer

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Hard

Question 6

Long Form

Discuss the use of fuels in vehicles and homes and the environmental concerns they cause.

Vehicles like cars and scooters need fuels like petrol or diesel to keep running on roads.
In our homes, we use cooking gas, coal, or wood as fuel to prepare our meals.
While these fuels are very useful, burning them releases smoke into the air.
This smoke leads to pollution which can be harmful to our health and the Earth.
An everyday example is seeing the dark smoke come out of some older buses or trucks on busy streets.

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Long Answer

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Medium

Question 7

Long Form

Describe the cotton wick and oil experiment and explain what it teaches about fuel.

For this experiment, you set up two diyas with cotton wicks but only add oil to one.
When you light both, the diya without oil burns out almost immediately.
The diya with oil continues to burn because the oil acts as a source of fuel.
This shows that a steady supply of fuel is required to produce light and heat.
It is similar to how a car stops moving once it runs out of petrol in its tank.

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Question 8

Long Form

Explain the various uses of electricity in our lives and the risks associated with it.

Electricity is a versatile form of energy used for movement, light, sound, and heat.
It powers our homes, schools, and large industries that make the things we need.
However, electricity can be dangerous if we are not careful while using electrical devices.
We must follow safety rules like not touching wires or putting fingers in sockets.
For example, a fan uses electricity to move its blades and blow cool air throughout a classroom.

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Long Answer

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Medium

Question 9

Long Form

Describe the process of generating energy from the wind using a pinwheel activity.

To make a pinwheel, you cut a square paper along its diagonals and pin the corners to a stick.
When you hold this pinwheel in a breezy area, the wind hits the paper blades.
The force of the moving wind causes the pinwheel to rotate around the pin.
This simple toy demonstrates how wind energy can be captured to create movement.
If there is no wind, you can see it work by running with the pinwheel in your hand.

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Long Answer

Hard difficulty • Structured explanation

Hard

Question 10

Long Form

How can sunlight be used to produce energy? Provide two specific examples from the text.

Sunlight is a natural source of energy that can be captured using modern technology.
Solar panels are special devices that turn direct sunlight into clean electricity for homes.
We can also use a magnifying glass to focus sunlight onto a point to generate heat.
The Bhadla Solar Park in Rajasthan is one of the world's largest plants doing this.
Another example is the Cochin International Airport in Kerala which runs completely on solar power.

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Chapter sections

Chapter 7: Energy—How Things Work | Long Questions

Describe the different forms of energy we see in a kitchen and how they work.

Explain the balloon air rocket activity and what it teaches us about energy.

Describe how to make a rubber band guitar and the type of energy it produces.

Outline the experiment to show how sunlight gives us heat energy using cups of water.

Explain why living things need energy and how they obtain and store it.

Discuss the use of fuels in vehicles and homes and the environmental concerns they cause.

Describe the cotton wick and oil experiment and explain what it teaches about fuel.

Explain the various uses of electricity in our lives and the risks associated with it.

Describe the process of generating energy from the wind using a pinwheel activity.

How can sunlight be used to produce energy? Provide two specific examples from the text.

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