NCERT MCQ Solutions for Class 8 Science Curiosity Chapter 1 Exploring the Investigative World of Science

It suggests variables like dough thickness or the way it is dropped into oil affect puffing. A puri puffs up like a balloon, and one side becoming thinner could be due to uneven rolling or oil exposure during frying.

Meaningful scientific experiments, only one variable should be changed while others are kept constant. This systematic method helps in understanding which specific change causes a particular effect and is central to scientific investigation.

Science begins with curiosity-driven questions. The chapter encourages both “Why” and “How” questions. These spark investigations that can be answered through careful observation and simple experiments, showing that inquiry lies at the heart of scientific exploration.

The chapter lists various controllable variables for a puri experiment like dough thickness, flour type and oil temperature. The brand of cooking pot is not mentioned as a controllable or measurable factor in this scientific context, making it irrelevant for investigation.

Careful documentation is vital in scientific investigation. Recording changes like smell, splatter or smoke helps in making connections and understanding the effect of variables. This builds the habit of systematic and thoughtful experimentation.

Changing only one variable ensures that observed effects can be accurately linked to that specific change. This method helps isolate causes and avoid misleading conclusions, allowing clearer understanding in scientific investigations.

The core of investigation is the ability to ask meaningful questions, design and perform simple experiments, observe outcomes and interpret results. This hands-on approach helps students become young scientists and is emphasised repeatedly throughout the chapter.

The chapter discusses measuring puffing time, noticing smell or smoke and controlling oil temperature. It never mentions the brand of oil as a relevant scientific variable, showing that only observable and controllable factors matter in experiments.

The first step in scientific investigation is asking a focused question. The text suggests asking what changes the way a puri puffs, which then leads to designing experiments around that question using controlled variables and observations.

Science is everywhere, and even a kitchen can serve as a laboratory. By frying puris or observing puffing, students can conduct real investigations without needing complex lab equipment, making science accessible and practical.

Observation gives raw data for interpretation. Without observing, experiments remain meaningless. The chapter insists on careful and repeated observation as the foundation for understanding natural phenomena and developing scientific thinking.

The idea that simple experiments at home can be just as scientific and insightful as those done in formal labs. It encourages students to explore everyday events with scientific tools like questioning and observation.

The puffing of puris in hot oil is used to spark curiosity. The phenomenon leads to questions about thickness, oil temperature and puffing time. This common example is ideal for demonstrating how everyday events can be studied scientifically.

The chapter encourages asking scientific questions like “Why does it puff?” rather than aesthetic or preference-based questions. Such questions lead to investigations involving dough, heat, and structure, making them scientifically significant.

The chapter balances grounded observation with creative exploration. The kite symbol reflects the idea that imagination and creativity help in formulating new hypotheses and extending inquiry beyond rigid frameworks into new scientific territory.

The puri puffing process is described as balloon-like, due to steam expanding inside as it heats. This simile helps students visualise the process and sparks questions about why puffing occurs unevenly under different conditions.

Some outcomes can be measured, like time taken for the puri to puff. This allows students to collect quantifiable data for analysis, strengthening the scientific nature of the investigation.

This iterative process is part of how science evolves. Observing outcomes from one round of experimentation can reveal new patterns or anomalies, encouraging deeper exploration and understanding through subsequent, well-designed investigations.

While the chapter discusses manipulating variables like dough thickness, flour type and oil temperature, it never mentions the colour of dough. Colour is irrelevant in the context of puffing and not presented as a scientifically meaningful variable in this experiment.

The chapter mentions pricking as a way to explore puffing behaviour. This small change allows one to observe whether steam expansion still causes puffing. It’s part of investigating the conditions that make a puri puff or not, by modifying one key feature.

The root and kite symbols show how science balances grounded knowledge and curiosity-driven exploration. The root represents foundational facts and observations, while the kite symbolises the creative and investigative spirit. Both are necessary for true scientific understanding and progress.

Changing several variables simultaneously makes it impossible to identify which change led to an observed result. The chapter stresses the need for controlled experiments, where only one variable is altered. This method allows precise interpretation of how that specific change affects the outcome.

The chapter emphasises that science is built on observing phenomena closely and thinking critically about what those observations mean. It is not limited to textbooks or labs but is a process driven by curiosity, methodical experimentation and clear reasoning based on gathered evidence.

The way puris are dropped into oil—vertically or at an angle—can change the puffing result. This becomes a variable for experimentation, showing how even small changes in method can affect the outcome and help us understand underlying processes.

The chapter honestly admits that even simple everyday phenomena like puri puffing are not fully understood by scientists. This highlights the openness of science—where not all questions have clear answers and exploration continues even in areas that seem ordinary.