Exploring the Investigative World of Science Class 8 Extra Questions and Answers Science Chapter 1

Students can keep Class 8 Science Extra Questions and Class 8th Curiosity Chapter 1 Exploring the Investigative World of Science Important Extra Question Answer handy for quick reference during exams.

Class 8 Science Chapter 1 Exploring the Investigative World of Science Extra Questions

Class 8 Science Chapter 1 Extra Questions on Exploring the Investigative World of Science

Exploring the Investigative World of Science Class 8 Very Short Question Answer

Question 1.
What is the purpose of asking questions like “Why?” and “How?” in science?
Answer:
Such questions spark curiosity and help initiate scientific investigation by exploring causes and explanations of natural phenomena.

Question 2.
How does investigation in science go beyond just finding new facts?
Answer:
It involves forming focused questions, designing experiments, making observations, and using results to deepen understanding.

Question 3.
How are microorganisms helpful and harmful at the same time?
Answer:
Microorganisms help in food production and making medicines, but can also cause infections and diseases.

Question 4.
How does our body fight infections and stay healthy?
Answer:
Through nutritious food, exercise, medicines, and the immune system that defends against harmful microbes.

Question 5.
Why does a ball fall back to the ground after being thrown up?
Answer:
The reason behind this phenomenon is the gravitational force pulling it back toward the Earth.

Exploring the Investigative World of Science Class 8 Short Question Answer

Question 1.
What is the scientific reason behind a car stopping when the brakes are applied?
Answer:
The frictional force between the brake and wheel slows down and stops the car.

Question 2.
How does pressure influence the weather?
Answer:
Changes in air pressure cause wind movement and can lead to weather events like storms and cyclones.

Question 3.
How do we see objects using light?
Answer:
Light reflects off objects and enters our eyes; smooth surfaces like mirrors reflect it.

Question 4.
What do we need to understand to know why air can exert pressure?
Answer:
We need to understand that air is made up of moving particles, which can apply force when they collide with surfaces.

Question 5.
Why is classifying substances important in science?
Answer:
Classification helps in understanding the properties, behaviour, and uses of different materials.

Question 6.
How do particles behave in solids compared to gases?
Answer:
In solids, particles are tightly packed and vibrate in place; in gases, they move freely and rapidly.

Question 7.
Why do we see bent images when looking at objects through water?
Answer:
Due to refraction, light changes direction when it passes from one medium (air) to another (water).

Question 8.
What causes the phases of the Moon?
Answer:
The phases occur due to the changing relative positions of the Moon, Earth, and Sun, affecting the visible illuminated part.

Question 9.
How did observing the Moon help humans create calendars?
Answer:
The Moon’s periodic phases allowed humans to track time, leading to the development of early calendars.

Question 10.
Why is Earth considered to be at a perfect distance from the Sun?
Answer:
It allows the presence of liquid water, moderate temperatures, and protection from harmful radiation conditions suitable for life.

Question 11.
What role can science play in solving climate challenges?
Answer:
Science helps us understand environmental changes, predict effects, and find sustainable solutions using data and observation.

Exploring the Investigative World of Science Class 8 Long Question Answer

Question 1.
Explain how the scientific method can be applied to everyday observations, using the example of why a puri puffs up unevenly.

Answer:
The scientific method starts with a question based on observation, like “Why is one side of a puri thinner than the other?” We begin by forming hypotheses: maybe the dough is uneven, or one side receives more heat. To test this, we must control variables like dough thickness, oil temperature, and type of flour. We can use tools to measure puff-up time, observe the shape and thickness before and after frying, and record the results. For example, dropping puris of different thicknesses or changing the oil temperature can help determine how these factors affect puffing. Repeating the experiment and changing one variable at a time while keeping others constant allows a systematic study. This shows how even a kitchen observation follows the steps of scientific inquiry.

Question 2.
Discuss the role of pressure and particle movement in explaining weather phenomena like winds and cyclones. How does understanding particle behaviour in the air help us predict such events?

Answer:
Air is made up of tiny particles that are constantly moving. When air heats up, particles move faster and spread out, reducing pressure. Cooler air has particles packed closer, creating high pressure. Air always moves from high pressure to low pressure. This movement is what we call wind. If the pressure difference is large and rapid, it can lead to strong winds and even cyclones. Understanding this helps scientists predict storms by measuring temperature and pressure variations. Satellite images and weather balloons help collect this data. Thus, studying air particle behaviour provides insight into how and why weather changes happen.

Question 3.
How does light help us perceive the world, and what scientific concepts explain phenomena like reflection, refraction, and the bending of light through different materials? Give real-life examples.
Answer:
Light allows us to see objects when it reflects off them and enters our eyes. Reflection happens when light bounces off smooth surfaces like mirrors. Refraction occurs when light passes through materials like water or glass and bends due to a change in speed. For instance, a spoon in a glass of water appears bent due to refraction. Shiny objects reflect light clearly, while rough surfaces scatter light. Lenses use refraction to focus light, helping in making eyeglasses and cameras. These concepts are also used in telescopes, microscopes, and magnifying glasses, making light a fundamental part of how we explore and understand the world.

Question 4.
Describe how scientific principles help us understand the relationship between Moon phases and timekeeping. How did observations of celestial cycles influence early calendars and our routines on Earth?
Answer:
The Moon’s phases change regularly due to its orbit around the Earth and the changing angle of sunlight hitting its surface. Ancient humans observed this predictable cycle to mark time. A new moon to full moon and back takes about 29.5 days, forming the basis of lunar months. People used these phases to create calendars and plan agriculture, festivals, and religious events. Scientific understanding now explains this through the relative positions of the Earth, Moon, and Sun. This knowledge also helps predict eclipses and tides. Hence, observation of celestial patterns using scientific methods influenced early timekeeping and continues to shape our routines.

Question 5.
Analyse how human activities are influencing Earth’s climate using scientific reasoning. What observations and evidence can we use to understand and reduce our impact on the planet?
Answer:
Human actions like burning fossil fuels, deforestation, and pollution increase greenhouse gases in the atmosphere, trapping heat and warming the planet. Scientific evidence includes rising global temperatures, melting glaciers, changing rainfall patterns, and more extreme weather events. Instruments like satellites, thermometers, and climate models provide data over decades, confirming climate change. This has consequences like rising sea levels and threats to biodiversity. Using science, we can understand these patterns and create solutions such as renewable energy, afforestation, and sustainable living. Observation, measurement, and experimentation help guide our actions to reduce environmental damage and protect Earth’s delicate balance.

Exploring the Investigative World of Science Class 8 Case Based Questions

Question 1.
A group of students was conducting a kitchen science experiment on why puris puff up. They observed that one puri puffed up perfectly into a round shape, while another puffed only on one side. Both were made from the same dough and fried in the same oil at the same time. The group wanted to know why this happened.

(a) What possible factors could have caused the difference in puffing between the two puris?
(b) How can the students apply the scientific method to investigate the cause?
(c) Design a simple controlled experiment to test one of the identified factors.
Answer:
(a) Factors: Thickness of dough, uneven rolling, moisture content, oil temperature, and dough resting time.
(b) Ask a question → form a hypothesis → control one variable → observe and record puffing results.
(c) Roll multiple puris of varying thickness while keeping the oil temperature and the dough constant. Fry and observe puffing differences.

Question 2.
A science club is analyzing a recent cyclone that hit a coastal region. They have access to weather data, including changes in air pressure, wind speed, and satellite images showing spiral cloud patterns. The club wants to understand the formation of the cyclone and how early warning signs could be detected scientifically.

(a) Using your knowledge of air pressure and particle movement, explain how the cyclone may have formed.
(b) What scientific instruments or tools could help in predicting such a cyclone?
(c) How can understanding this case help reduce the impact of future storms?
Answer:
(a) Rapid fall in air pressure creates low pressure center; surrounding high-pressure air rushes in, spirals due to Earth’s rotation → cyclone forms.
(b) Barometers (air pressure), anemometers (wind speed), satellites, and weather balloons.
(c) Early warnings, evacuation planning, pressure tracking, awareness campaigns.

Exploring the Investigative World of Science Extra Questions for Practice

Question 1.
What is meant by “systematic investigation” in science?

Question 2.
Name one variable that affects how a puri puffs up.

Question 3.
What is the first step in a scientific investigation?

Question 4.
Why is observation important in science?

Question 5.
Explain why only one variable should be changed during an experiment.

Question 6.
How does frying a puri help us understand scientific investigation?

Question 7.
What is the role of curiosity in scientific thinking?

Question 8.
Why is it important to keep notes during an experiment?

Question 9.
How does the chapter encourage students to see science in everyday life? Give examples.

Question 10.
Explain the importance of observation, questioning, and experimentation in science.

Question 11.
Discuss how changing one variable at a time helps in identifying cause-and-effect relationships.

Question 12.
Why does the chapter say that even a kitchen can be a laboratory? Support your answer with examples.

Question 13.
If you observe that a puri puffs only on one side despite following the same cooking process, how would you design an experiment to identify the cause? List the variables you would control.

Question 14.
A student claims that “all microorganisms are harmful.” Use scientific reasoning and examples to argue against or support this statement.

Question 15.
Suppose the Moon suddenly stopped orbiting the Earth. Using your understanding of Moon phases and celestial motion, what would be the impact on life and timekeeping on Earth?

Question 16.
How would the behaviour of a balloon change if taken to a high-altitude mountain? Use the concepts of air pressure and particle movement to justify your answer.

Question 17.
Imagine a mirror placed under a stream of flowing water. How might the reflection change compared to a mirror in still air? Explain using light behaviour principles.

Question 18.
A new material is discovered that bends light more than water but less than glass. What could be its possible applications in optical instruments? Explain your reasoning.

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