The Ever-Evolving World of Science – Short Answer Type Questions
Class 7
Science
Chapter 1
Strictly Based on NCERT Syllabus
CBSE Class 7 Science – Chapter 1: The Ever-Evolving World of Science
Topic-wise Short Answer Type Questions with clear and easy-to-understand answers for effective revision.
Useful For: Class Tests • Periodic Assessments • Half-Yearly & Annual Exams • CBSE Class 7 Science Board Exam Standard
This page provides a comprehensive, topic-wise set of 50 Short Answer Type Questions from
CBSE Class 7 Science – Chapter 1: The Ever-Evolving World of Science.
Each answer is written in NCERT-aligned, simple language to help students understand the
nature and scope of science, its role in everyday life and the basics of scientific inquiry.
These questions are designed strictly as per the NCERT syllabus, making them ideal for
CBSE Class 7 board exams standard preparation and revision.
Short Answer Type Questions – Chapter 1: The Ever-Evolving World of Science
Topic 1: Meaning and Nature of Science (Q1–10)
Q1–Q10: Understanding What Science Is
Q1. Define science in your own words.
Ans. Science is a systematic and organised way of studying the natural world. It helps us understand how things happen by using observations, experiments and logical reasoning instead of guesses or superstitions.
Q2. Why is science described as a “systematic study”?
Ans. Science is called a systematic study because it follows an ordered method. Scientists do not work randomly; they first observe, then ask questions, form a hypothesis, perform experiments, record data and finally draw conclusions.
Q3. How does this chapter describe the “ever-evolving” nature of science?
Ans. The chapter says science is ever-evolving because our scientific knowledge keeps growing. New tools, observations and experiments lead to new discoveries, which may improve or even change older ideas and theories.
Q4. Why is observation important in science?
Ans. Observation is important because it is the starting point of scientific study. By carefully noticing events and changes around us, we can identify patterns, ask meaningful questions and design experiments to find answers.
Q5. How is science different from guesswork?
Ans. Science is based on evidence and proof, whereas guesswork has no proper support. In science, conclusions are drawn after repeated experiments and observations, not just on someone’s personal belief or opinion.
Q6. Explain why science is considered a way of thinking.
Ans. Science is a way of thinking because it teaches us to be curious, to ask “why” and “how”, and to look for logical reasons. It encourages us to rely on facts, evidence and reasoning instead of blindly accepting anything.
Q7. What role does evidence play in science?
Ans. Evidence is the backbone of science. Scientists accept an idea only when it is supported by observations, experiments or measurements. If there is no evidence, the idea is not treated as scientific.
Q8. How does science help us to understand natural phenomena?
Ans. Science explains natural phenomena by studying their causes and effects. For example, it explains why seasons change, why objects fall to the ground, and how rain is formed, using concepts like gravity, motion and the water cycle.
Q9. Why do scientific ideas sometimes change over time?
Ans. Scientific ideas change when new evidence is discovered. As better instruments and methods are developed, scientists may get more accurate information, which can correct or improve older explanations.
Q10. How does this chapter help to build a basic understanding of scientific inquiry?
Ans. The chapter introduces simple ideas like observation, asking questions, forming hypotheses and doing experiments. These steps show how scientific inquiry works and help students understand how scientists explore and explain the world.
Topic 2: Scope and Branches of Science (Q11–20)
Q11–Q20: What Science Covers
Q11. What do we mean by the “scope of science”?
Ans. The scope of science means the wide range of things that science studies. It includes living and non-living things, tiny particles like atoms, large bodies like planets, forces, energy, Earth processes and even outer space.
Q12. Name three broad areas of science and briefly mention what each studies.
Ans. The three broad areas are:
(i) Biology – studies living organisms like plants and animals.
(ii) Chemistry – studies substances, their properties and changes.
(iii) Physics – studies motion, forces, energy, light, sound and electricity.
Q13. How does Earth science fit into the scope of science?
Ans. Earth science is part of science that focuses on Earth and its environment. It studies rocks, soil, water, air, weather, natural resources and changes in the Earth’s surface like earthquakes and volcanoes.
Q14. What does astronomy study, and why is it important?
Ans. Astronomy studies heavenly bodies like the Sun, Moon, planets, stars and galaxies. It is important because it helps us understand our place in the universe, how celestial bodies move and how space technology works.
Q15. Why are modern sciences like environmental science called interdisciplinary?
Ans. Modern sciences like environmental science are called interdisciplinary because they combine knowledge from many branches such as Biology, Chemistry, Physics and Earth science to solve complex real-life problems.
Q16. In Class 7, why do we study an integrated science book instead of separate books for each branch?
Ans. In Class 7, we study an integrated science book so that we can see how ideas from different branches are connected. This approach makes it easier to relate concepts and understand science as a whole rather than as separate subjects.
Q17. Give an example to show that one topic can involve more than one branch of science.
Ans. Growing crops involves Biology (plants and pests), Chemistry (fertilisers and soil nutrients) and Physics (irrigation, machines). This shows that many topics use ideas from more than one branch of science.
Q18. How does knowing the branches of science help you in future studies?
Ans. Knowing the branches of science helps you decide which areas interest you more. It also prepares you for higher classes where you may study Physics, Chemistry and Biology separately in greater detail.
Q19. Why is it said that the scope of science is unlimited?
Ans. The scope of science is called unlimited because there is always something new to discover. Whether it is inside the human body, in the deep sea or in distant space, science can continue to explore and learn more.
Q20. How does this chapter help you understand that different branches of science are connected?
Ans. The chapter shows that the same situation, like weather or health, can be explained using ideas from physics, chemistry and biology. This helps us see that different branches of science support and complement each other.
Topic 3: Science in Everyday Life (Q21–30)
Q21–Q30: Science Around Us
Q21. Explain with two examples how science is used in your home.
Ans. At home, science is used in many ways. For example, an electric iron uses the heating effect of electric current to press clothes. A refrigerator uses scientific principles of cooling and insulation to keep food fresh for longer.
Q22. How does science make transport faster and more convenient?
Ans. Science has helped design powerful engines, better fuels and safer vehicles like cars, trains and aeroplanes. These developments allow people and goods to move quickly over long distances, saving time and effort.
Q23. Describe the role of science in modern communication.
Ans. Science has led to the invention of telephones, mobile phones, computers, the internet and satellites. These devices use signals, waves and digital technology to send messages, pictures and videos quickly across the world.
Q24. How has science improved healthcare?
Ans. Science has given us vaccines, medicines, X-rays, blood tests and machines like ECG and MRI. These help doctors diagnose diseases early, treat patients more effectively and save many lives.
Q25. Give an example to show how science is used in agriculture.
Ans. In agriculture, science is used to develop high-yielding seeds, suitable fertilisers and pesticides. It also helps in designing irrigation systems like sprinklers and drip irrigation to provide water efficiently to crops.
Q26. Why do we say that science has made our life more comfortable?
Ans. Science has given us many comforts such as fans, coolers, air-conditioners, washing machines and gas stoves. These appliances reduce manual work and help us live more comfortably in different seasons.
Q27. How does science help us in times of natural disasters?
Ans. Science helps us predict disasters like cyclones and floods using weather satellites and radars. It also helps in building stronger houses and bridges and in organising rescue and relief operations more effectively.
Q28. What dangers can arise if scientific knowledge is misused?
Ans. Misuse of scientific knowledge can lead to pollution, harmful weapons, accidents and damage to the environment. For example, careless use of chemicals can pollute soil and water, and misuse of technology can affect privacy and health.
Q29. How can you personally use science in a responsible way in daily life?
Ans. I can use science responsibly by saving electricity, using clean fuels, avoiding wastage of water and following safety rules while using appliances. I should also use the internet and gadgets in a balanced and safe manner.
Q30. Why is it important to understand the science behind everyday gadgets?
Ans. Understanding the science behind gadgets helps us use them correctly and safely. It also helps in solving simple problems, saving energy and motivates us to think of new inventions and improvements.
Topic 4: Scientific Attitude and Scientific Method (Q31–40)
Q31–Q40: How Scientists Think and Work
Q31. What is meant by a “scientific attitude”?
Ans. A scientific attitude means thinking in a curious, logical and open-minded way. A person with scientific attitude asks questions, looks for evidence, avoids superstitions and is ready to change their views if new proof is found.
Q32. Mention any three qualities of a student with a scientific attitude.
Ans. A student with a scientific attitude is:
(i) Curious – always eager to know why things happen.
(ii) Honest – reports observations truthfully.
(iii) Open-minded – accepts new ideas when there is evidence.
Q33. Why is it important to ask questions in science?
Ans. Asking questions is important because it starts the process of investigation. When we ask “why” or “how”, we begin to look for reasons, design experiments and learn more about the natural world.
Q34. What is a hypothesis? Give an example.
Ans. A hypothesis is a possible explanation or guess that can be tested.
Example: “Plants watered with manure solution will grow taller than plants watered with plain water.” This idea can be checked with an experiment.
Q35. List the main steps of the scientific method in simple form.
Ans. The main steps are:
1. Observation of a problem
2. Asking a question
3. Forming a hypothesis
4. Doing experiments
5. Recording and analysing data
6. Drawing a conclusion.
Q36. How does experimentation help in scientific inquiry?
Ans. Experimentation helps by providing practical tests for hypotheses. In experiments, conditions are controlled so that the effect of one factor can be observed clearly, making the results more reliable.
Q37. Why must scientific experiments be repeatable?
Ans. Experiments must be repeatable so that other people can perform them and get similar results. This repetition shows that the results are not due to chance and that the conclusion is dependable.
Q38. What is the role of data in a scientific investigation?
Ans. Data are the measurements and observations collected during experiments. They are used to check whether the hypothesis is supported. Without data, we cannot prove or disprove our ideas scientifically.
Q39. How does the chapter encourage you to avoid superstitions?
Ans. The chapter encourages scientific thinking, which depends on proof. It teaches that events like illness or crop failure have natural causes and should not be blamed on luck or superstitions that have no evidence.
Q40. Why is it important for students to practise scientific inquiry from an early age?
Ans. Practising scientific inquiry from an early age helps students become good problem-solvers. It trains them to think clearly, ask questions, check facts and make informed decisions in studies and in everyday life.
Topic 5: Instruments, Measurements, Safety and Ethics (Q41–50)
Q41–Q50: Tools, Care and Responsibility in Science
Q41. Name any three simple scientific instruments that you may use in the school laboratory.
Ans. Three simple scientific instruments are:
(i) Thermometer – to measure temperature
(ii) Measuring cylinder – to measure the volume of liquids
(iii) Spring balance – to measure force or weight.
Q42. Why are standard units of measurement important in science?
Ans. Standard units are important because they are the same everywhere. When scientists use units like metre, kilogram and second, their measurements can be compared and understood across the world without confusion.
Q43. Give one example to show how incorrect measurement can affect a scientific experiment.
Ans. If we measure the wrong amount of water or chemical in an experiment, the reaction may not occur as expected. This can lead to wrong conclusions and may even make the experiment unsafe.
Q44. State any three safety rules that must be followed in a science laboratory.
Ans. Three safety rules are:
(i) Do not taste or smell chemicals directly.
(ii) Handle glassware and equipment carefully.
(iii) Do not run or play in the laboratory and always follow the teacher’s instructions.
Q45. Why is it important to wear proper footwear and keep the lab floor dry?
Ans. Proper footwear and a dry floor prevent slipping and injuries. If liquids or glass pieces fall, bare feet or wet floors can cause serious accidents and cuts.
Q46. What do you understand by ethics in science?
Ans. Ethics in science means following moral rules while doing scientific work. Scientists must be honest, not copy others’ work, not harm people, animals or the environment and must use knowledge for helpful purposes.
Q47. Why must scientists report their findings honestly, even if their results are negative?
Ans. Scientists must report honestly because other people depend on their work. Negative results also give useful information and can save time and money by preventing others from repeating the same mistakes.
Q48. Can science answer questions about personal likes or religious beliefs? Give a reason.
Ans. No, science cannot answer questions about personal likes or religious beliefs. These are matters of opinion and faith, whereas science deals only with questions that can be tested and observed in the natural world.
Q49. How can students respect both science and other ways of thinking?
Ans. Students can respect science by using it for understanding nature and solving practical problems, while also respecting other people’s beliefs and values. They should use scientific thinking for factual questions and show tolerance in personal matters.
Q50. Summarise how this chapter prepares you for later chapters in Class 7 Science.
Ans. This chapter builds the base for all other chapters. It teaches what science is, how scientists work and how science affects daily life. With this understanding, students can more easily learn topics like heat, acids and bases, motion, electricity and environment in later chapters.