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

ByteNotes

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

Case Study

Passage with linked questions

Case Set

Case Set 1

Case Analysis

Passage

Aarav visited his grandmother's house in a small village. In the morning, he saw her cooking lunch on a traditional stove using wood. Later that evening, he saw his uncle filling petrol in his scooter to go to the market. Aarav noticed that the wood stove created a lot of smoke, while the scooter moved very fast with a loud sound. He realized that both the stove and the scooter needed something special to work and finish their tasks.

Question 1: What is the common term used for things like wood and petrol that help the stove and scooter work?

These things are called fuels.
They are sources of energy used to perform different activities.

Question 2: Why did Aarav see a lot of smoke while his grandmother was cooking?

Smoke is created when fuels like wood or coal are burned for cooking.
This happens because these traditional fuels release gases that cause pollution.

Question 3: Explain how the scooter and the wood stove use energy differently based on the passage.

The stove uses heat energy from the wood to cook the food.
The scooter uses energy from petrol to create movement so it can travel.
The scooter also produces sound energy while it is running.

ByteNotes

Case Study

Passage with linked questions

Case Set

Case Set 2

Case Analysis

Passage

During the school sports day, Meera participated in many races. In the morning, she had a healthy breakfast of milk and parathas. By the afternoon, after running several races, she started feeling very tired and hungry. Her teacher gave her an orange to eat. After eating the fruit and resting for a while, Meera felt active again and was ready for the final relay race with her friends.

Question 1: Why did Meera feel tired after running several races?

She felt tired because her body had used up the energy it had.
When we do physical work and do not eat, our energy levels go down.

Question 2: How did the orange help Meera feel active again?

Food is the source of energy for all living things.
The energy from the food makes us active and ready to play or work again.

Question 3: Even when Meera was resting, was her body still using energy? Give reasons.

Yes, our body uses energy even when we are simply sitting or resting.
The brain uses energy all the time, even when we are sleeping or thinking.
Living things need energy for internal processes to stay alive.

ByteNotes

Case Study

Passage with linked questions

Case Set

Case Set 3

Case Analysis

Passage

Simran and her brother were playing with balloons. Simran blew up a big red balloon and held its mouth tightly. When she let go, the balloon zoomed across the room as air rushed out. Her brother then showed her a 'Balloon Air Rocket' he made. He taped a balloon to a straw on a string. When he released the balloon, it traveled straight along the string from one end of the room to the other.

Question 1: What made the red balloon move across the room when Simran let go?

The air rushed out of the mouth of the balloon.
This rushing air generated energy that pushed the balloon forward.

Question 2: In the 'Balloon Air Rocket', how did the straw and string help the balloon?

The straw and string helped the balloon move in a fixed direction.
They allowed the energy from the air to guide the toy along a straight path.

Question 3: What could Simran change to make the 'Balloon Air Rocket' move slower?

She could blow less air into the balloon so there is less energy.
She could use a smaller balloon to reduce the amount of rushing air.
She could change the thickness of the string to create more resistance.

ByteNotes

Case Study

Passage with linked questions

Case Set

Case Set 4

Case Analysis

Passage

Rahul made a 'Rubber Band Guitar' for his music project using an old cardboard box. He stretched three rubber bands of different thicknesses across a hole in the box. When he plucked the thinnest band, it made a high sound. When he plucked the thickest band, the sound was much deeper. Rahul saw the bands moving back and forth very quickly every time he touched them.

Question 1: What is the scientific name for the back-and-forth movement Rahul saw?

This movement is called vibration.
Vibrations are what produce the sounds we hear.

Question 2: What kind of energy is created by the plucking of these rubber bands?

Plucking the bands produces sound energy.
This is the energy that travels through the air for us to hear.

Question 3: Why did the sound change when Rahul plucked the thinner or thicker bands?

Different thicknesses of rubber bands vibrate at different speeds.
A thinner band produces a different sound compared to a thicker band.
The energy produced depends on the size and tension of the material being used.

ByteNotes

Case Study

Passage with linked questions

Case Set

Case Set 5

Case Analysis

Passage

Isha wanted to test how the Sun gives us energy. She took two identical steel cups and filled them with water. She placed one cup on the balcony in direct sunlight and the other inside a dark cupboard. After twenty minutes, she touched the water in both. The water in the balcony cup felt warm, while the cupboard water was still cool. She wondered how the water got hot without a stove.

Question 1: What kind of energy did the Sun provide to the water in the balcony cup?

The Sun provided heat energy to the water.
This energy made the water warmer over time.

Question 2: Why did the water inside the cupboard remain cool?

The water in the cupboard was in the shade and did not get direct sunlight.
Without the Sun's heat energy, the temperature of the water did not increase.

Question 3: Based on the text, give another example of how we use this specific energy from the Sun in daily life.

We use the Sun's heat to dry damp clothes hung outside.
Sunlight is used to produce electricity using solar panels.
The Sun provides light so we can see things around us clearly.

ByteNotes

Premium Access

Unlock all Case Study sets

You are viewing 5 free case study sets from this chapter. Upgrade to Premium to unlock the remaining 10 sets.

Upgrade to Premium10 questions locked

Chapter sections

Chapter 7: Energy—How Things Work | Case Study Questions

Passage

Question 1: What is the common term used for things like wood and petrol that help the stove and scooter work?

Question 2: Why did Aarav see a lot of smoke while his grandmother was cooking?

Question 3: Explain how the scooter and the wood stove use energy differently based on the passage.

Passage

Question 1: Why did Meera feel tired after running several races?

Question 2: How did the orange help Meera feel active again?

Question 3: Even when Meera was resting, was her body still using energy? Give reasons.

Passage

Question 1: What made the red balloon move across the room when Simran let go?

Question 2: In the 'Balloon Air Rocket', how did the straw and string help the balloon?

Question 3: What could Simran change to make the 'Balloon Air Rocket' move slower?

Passage

Question 1: What is the scientific name for the back-and-forth movement Rahul saw?

Question 2: What kind of energy is created by the plucking of these rubber bands?

Question 3: Why did the sound change when Rahul plucked the thinner or thicker bands?

Passage

Question 1: What kind of energy did the Sun provide to the water in the balcony cup?

Question 2: Why did the water inside the cupboard remain cool?

Question 3: Based on the text, give another example of how we use this specific energy from the Sun in daily life.

Unlock all Case Study sets