Class 9 Science Exploration Solutions English Medium

NCERT Solutions Class 9 Science Exploration English Medium

Exploration: Entering the World of Secondary Science

Topic: Assignments - What Have You Learned?

Chapter 1. Exploration: Entering the World of Secondary Science

This assignment is based on the complete chapter and follows the latest CBSE competency-based pattern. It helps students strengthen conceptual understanding, analytical thinking and application skills.

Chapter Assignment

1. One Word Answer

1. What is the systematic study of the natural world called?
2. What is the careful study of objects or events using our senses called?
3. What is the simplified representation of a real object or system called?
4. Which system of units is accepted internationally?
5. What is a statement that describes a consistent natural relationship called?
6. What is a well-tested explanation of natural phenomena called?
7. What is an approximate value close to the actual value called?
8. Which subject is known as the language of science?
9. What is the process of testing ideas through practical investigation called?
10. What type of thinking is based on evidence and logical reasoning?

2. Fill in the Blanks

1. Science begins with __________.
2. A scientific model is a __________ representation of a real system.
3. Scientists use __________ units for uniform measurements.
4. Scientific conclusions are based on __________.
5. Mathematics helps scientists express relationships using __________.
6. Scientific theories are supported by __________ and experiments.
7. Estimation gives an __________ value.
8. Science develops through observation and __________.
9. Scientific predictions are based on __________ reasoning.
10. Science is an __________ subject because it combines many branches.

3. True or False

1. Scientific theories are simply guesses.
2. Science depends on evidence and experimentation.
3. Scientific models always show every detail of a real object.
4. SI Units are accepted throughout the world.
5. Observation is an important part of scientific investigation.
6. Scientific knowledge can change with new evidence.
7. Mathematics has no role in science.
8. Scientific predictions are based on evidence.
9. Science is useful only inside laboratories.
10. Scientific thinking helps solve real-life problems.

4. Match the Following

5. Very Short Answer Questions

1. Define Science.
2. What is Observation?
3. What is a Scientific Model?
4. Why are SI Units important?
5. What is Scientific Evidence?
6. What is Estimation?
7. Define Scientific Prediction.
8. What is Scientific Thinking?
9. Why is Mathematics important in Science?
10. Name any two branches of Science.

6. Short Answer Questions

1. Explain the importance of observation in science.
2. Describe the characteristics of scientific models.
3. Differentiate between Scientific Law and Scientific Theory.
4. Why do scientists use standard units?
5. Explain the role of mathematics in science.
6. How does estimation help in everyday life?
7. Why is evidence important in science?
8. Explain the importance of scientific predictions.
9. What are the qualities of a scientific learner?
10. Why is science called an interdisciplinary subject?

7. Long Answer Questions

1. Explain the scientific method with suitable examples.
2. Discuss the importance of scientific models in understanding complex systems.
3. Describe how science improves our daily life.
4. Explain the role of scientific thinking in solving real-life problems.
5. Discuss the importance of evidence, observation and experimentation in science.
6. Explain the relationship between science and mathematics.
7. Describe the role of science in national development.
8. Explain why scientific knowledge continues to change with new discoveries.
9. Discuss the importance of developing a scientific attitude among students.
10. Explain how science contributes to sustainable development.

8. Case Study Questions

Case Study 1

A student observes that ice melts when kept in sunlight. She records the time taken for melting and repeats the experiment several times before drawing a conclusion.

1. Which scientific skill is demonstrated first?
2. Why did the student repeat the experiment?
3. Why is evidence important before drawing a conclusion?
4. Name one scientific attitude shown in this activity.

Case Study 2

Scientists use models of the Solar System to understand the movement of planets because the actual system is too large to study directly.

1. What is a scientific model?
2. Why are models used in science?
3. Name another example of a scientific model.
4. Can scientific models change with new discoveries? Explain.

Case Study 3

A weather department predicts heavy rainfall using satellite images, observations and mathematical calculations.

1. What is scientific prediction?
2. Which branch of mathematics helps in such predictions?
3. Why are observations important?
4. How do such predictions help society?

Case Study 4

A scientist carefully records every observation during an experiment without changing any result, even when the expected outcome is not obtained.

1. Which scientific value is shown?
2. Why should scientific observations be recorded honestly?
3. What is scientific evidence?
4. How does honesty improve scientific research?

Case Study 5

A team of doctors, engineers and computer scientists work together to develop a smart medical device for patients.

1. Which concept of science does this example represent?
2. Why do different branches work together?
3. Name any two branches involved.
4. How does interdisciplinary science benefit society?

9. Competency-Based Questions

1. Why is curiosity considered the starting point of scientific learning?
2. How do scientific models simplify complex systems?
3. Why are SI Units necessary for scientific communication?
4. Explain why scientific theories are not mere guesses.
5. How does mathematics improve scientific investigations?
6. Why should scientific conclusions always be supported by evidence?
7. How does estimation help identify unreasonable answers?
8. Explain the relationship between observation and experimentation.
9. Why is scientific thinking important in everyday life?
10. How can students develop a scientific attitude?

10. HOTS Questions

1. Can scientific knowledge ever become complete? Give reasons.
2. Why should a scientist be open to changing old ideas?
3. How would scientific progress be affected if experiments were not repeatable?
4. Why is evidence more reliable than personal opinion?
5. How can scientific thinking help solve environmental problems?
6. Do you think every scientific discovery benefits society? Justify your answer.
7. How are science and technology dependent on each other?
8. If standard units did not exist, what problems would scientists face?
9. How does interdisciplinary science solve modern global challenges?
10. Why is developing scientific thinking more important than memorising scientific facts?

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