Class 9 · ScienceNCERT 2026 Revised Syllabus
Chapter 1: Exploration: Entering the World of Secondary Science (0906CH01)
Exploration · Scientific method, SI units and laboratory safety.
Chapter code: 0906ch01 · Book: Exploration · Class 9 Science
Find complete NCERT solutions for Class 9 Science, Exploration Chapter 1. Every question has a clear, step-by-step answer for chapter code 0906CH01.
Pause and Ponder(3 questions)
1
Think of a prediction you or your family made recently (for example, the outcome of a cricket match). Was it based on evidence and reasoning, or mainly on guesswork? How can scientific thinking improve such predictions?
School Level Solution
Ans.
A prediction may begin as a guess, but scientific thinking improves it by identifying relevant evidence, stating the reasoning clearly, comparing the prediction with observations or data, and revising the prediction when new evidence disagrees.
2
Describe one situation where an approximate answer is good enough, and one where you would need a very exact value.
School Level Solution
Ans.
For a quick estimate, an approximate value such as the time needed to walk to a nearby place may be sufficient. An exact value is needed for situations such as measuring a medicine dose or carrying out a precise scientific experiment.
3
Choose a real‑life object (maybe a pressure cooker or a mobile phone) or a problem (maybe a traffic jam near your school). Make a sketch listing what kind of ideas from physics, chemistry, biology, earth science, or mathematics are involved. Show how at least two branches of science connect with your example.
School Level Solution
Ans.
Example: a mobile phone involves physics (electricity and electromagnetic waves), chemistry (battery materials), biology (human interaction and effects on the body), and mathematics (signal processing). Physics and chemistry, for example, connect in the design and operation of the battery and communication hardware.
Examples & Activities(3 questions)
1
Suppose you ride a bicycle from your school to your home. You want to model the time it takes to go home from school. What details would you keep? What details could you ignore? Suggest why ignoring some details may actually be useful.
School Level Solution
Ans.
Keep the route/distance, typical cycling speed, traffic, major stops and other factors that can noticeably change the travel time. You can ignore small details such as the exact shape or colour of objects along the route because they add complexity without improving the prediction for this purpose.
2
Think of some questions Meghna could ask Varsha to make this prediction scientifically testable.
School Level Solution
Ans.
For example: What exactly are you predicting? Under what conditions? What measurements or observations would support or contradict it? What time interval, sample, or repeated trials would make the prediction testable?
3
In Example 1.3, air occupies a measurable volume. What does this illustrate about using measurement and standard units in a scientific description?
School Level Solution
Ans.
Scientific descriptions become comparable and reproducible when quantities are measured and reported with standard units (for example, litres for volume).