Students can use Class 7 Science Curiosity Extra Questions and Chapter 1 The Ever Evolving World of Science Extra Question Answer to prepare effectively at home.
Class 7 Science Chapter 1 The Ever Evolving World of Science Extra Questions
Class 7 Science Chapter 1 Extra Questions on The Ever Evolving World of Science
The Ever Evolving World of Science Class 7 Very Short Question Answer
Question 1.
What does science cover?
Answer:
It covers small, big, near and far things like sun and stars.
Question 2.
What is Science?
Answer:
It is a way of thinking, exploring and discovering.
Question 3.
Explain how science is a continuous process of discovery.
Answer:
Science is ongoing because every discovery leads to new questions and experiments. It never stops as we keep exploring deeper into nature.
Question 4.
Give two examples of physical changes.
Answer:
(a) melting of ice
(b) melting of glaciers.
Question 5.
Can changes be reversed?
Answer:
Yes. They may not be reversed.
Question 6.
Where does water on ground go?
Answer:
Water trickles into the ground.
Question 8.
What are eclipses ?
Answer:
Moon, earth cast shadows which lead to phenomena eclipses.
Question 9.
Name two types of materials.
Answer:
Natural materials and man-made materials.
Question 10.
Differentiate between metals and nonmetals.
Answer:
Difference between metals and non-metals:
| Metals | Non-metals |
| Generally hard. | Generally soft, except diamond. |
Question 11.
Name two types of changes. Give examples.
Answer:
(a) Physical change
(b) Chemical change
Question 12.
Write a few changes you see around us.
Answer:
Melting of ice, evaporation of water, growth of a seed into a plant.
Question 13.
In older days, what was observed to tell time?
Answer:
Shadows of objects in sun.
Question 14.
Can chemical changes be reversed?
Answer:
No, it cannot be reversed.
Question 15.
Name any three fields of science.
Answer:
(a) Physics
(b) Chemistry
(c) Biology.
The Ever Evolving World of Science Class 7 Short Question Answer
Question 1.
What is the difference between reversible and irreversible changes?
Answer:
Reversible changes can be undone and return to their original form, like ice melting and then freezing again. Irreversible changes cannot be undone, like a fruit ripening or a battery running out of power.
Question 2.
Why is it important to step outside the classroom to learn science?
Answer:
Experiencing the world through activities and experiments helps us understand science better than just reading, making learning hands-on and meaningful.
Question 3.
What role do light and shadows play in our daily life and in science?
Answer:
Light and shadows help us see, tell time, and explain natural phenomena like eclipses and day-night cycles.
Question 4.
State three examples of changes.
Answer:
(a) Rocks break up into pebbles.
(b) Batteries run out
(c) The fruits ripen.
Question 5.
Name the kinds of matrials.
Answer:
Metals and Non-metals based on their properties.
Question 6.
How do we measure time in olden days?
Answer:
(a) by shadows in olden times
(b) by sun and moon.
Question 7.
What type of changes happen around us?
Answer:
We experience many types of changes like freezing of ice, fruits ripen, etc.
Question 8.
What is the science in a broad way?
Answer:
(a) It is a way of thinking.
(b) It is a way of discovering new facts.
(c) This is an ongoing way of discovery.
(d) It is related to human’s activities and natural phenomena occuring in sustainable world.
Question 9.
Give certain uses of light and shadows.
Answer:
(a) Useful for puppets,
(b) useful to tell time,
(c) in happening of day and night,
(d) to happen eclipses.
Question 10.
What is science and how does it help us understand the world around us?
Answer:
Science is the study of the natural world through observations, experiments, and facts. It helps us understand how things work, solve problems, and make informed decisions about the world around us.
Question 11.
What is the main aim of NCERT class 7 ‘Curiosity’ textbook?
Answer:
Curiosity is essential in science because it fuels exploration, questioning, and the pursuit of knowledge. It drives researchers to investigate the unknown, ask “why” questions, and seek answers through rigorous investigation and observation.
Question 12.
Write some changes that happen around us.
Answer:
(a) The ice melts into water.
(b) The batteries run out.
(c) Animals and plants grow.
(d) The ice melts into water.
(e) The water evaporates from the seas to fall in form of rain.
(f) Water trickles down into ground.
Question 13.
Why is it important to step out of the classroom and engage in activities and experiments for learning science?
Answer:
It is important to step out of the classroom and engage in activities and experiments because they help connect theory with practice. Hands-on experiences make science more interesting, help us understand concepts better, and develop critical thinking skills.
The Ever Evolving World of Science Class 7 Long Question Answer
Question 1.
Explain the importance of understanding the properties of different materials, and how does this helps in everyday life?
Answer:
Understanding the properties of materials is essential because it helps us choose the right materials for specific uses. For example, metals are good conductors of electricity, so they are used in electrical wiring. Rubber is a poor conductor, so it is used for insulation. In everyday life, we interact with various materials without thinking about their properties, such as the clothes we wear (which are chosen for comfort and durability) or the tools we use (which are made of strong, durable materials). Knowledge of material properties helps engineers, manufacturers, and even consumers make informed choices about products, ensuring they are efficient, and long-lasting.
Question 2.
Explain why science is considered both a process and a way of thinking.
Answer:
Science is not just a collection of facts but a continuous process of asking questions and seeking answers. It involves curiosity, experiments, observations, and logical reasoning. Scientists observe patterns in nature and try to understand why and how things happen. This method of thinking encourages openness to new ideas and revising old ones based on evidence. Hence, science helps us develop critical thinking and problem-solving skills.
Question 3.
How do light and shadows help us understand time and natural phenomena like eclipses?
Answer:
Early humans used the length and position of shadows cast by the Sun to measure time during the day. Light enables us to see objects, and shadows show the shape and position of these objects. The Earth and Moon cast shadows that cause eclipses, which are important astronomical events.Studying light and shadows helps explain day and night cycles caused by Earth’s rotation. This understanding connects everyday experiences with larger cosmic events.
Question 4
Explain the difference between physical and chemical changes with examples.
Answer:
Physical Change:
Altering a substance’s form or appearance without changing its chemical makeup. Examples:
- Melting ice into water.
- Boiling water into steam.
- Freezing water into ice.
- Shredding paper.
- Dissolving sugar in water.
Chemical Change:
A change that produces new substances with different properties. Examples:
- Burning wood.
- Rusting iron.
- Cooking an egg.
- Curdling milk.
- Digestion of food.
Question 5.
Discuss how scientific experiments and observations can lead to a deeper understanding of the environment and human activities.
Answer:
Scientific experiments and observations are crucial for understanding the natural world and the impact of human activities on the environment. Through hands-on experiments, like testing how materials conduct heat or electricity, we gain insights into the properties of materials and how they affect daily life. By asking questions about changes in nature, like why fruits ripen or how ice melts, we begin to understand deeper environmental processes such as the water cycle or energy flow. Furthermore, as we explore the relationship between human activities and nature, such as how deforestation or pollution affects the environment, we learn how to make more responsible choices. This knowledge not only helps us understand the world better but also empowers us to address environmental challenges and work towards a sustainable future.
Question 6.
Explain the difference between reversible and irreversible changes.
Answer:
| Reversible Changes | Irreversible Changes |
| 1. A substance can return to its original state. | 1. A substance cannot return to its original state. |
| 2. The chemical properties of the substance do not change. | 2. The chemical properties of the substance change. |
| 3. Most physical changes are reversible changes. | 3. All chemial changes are irreversible changes. |
| 4. For example – a balloon changing its size, shape on blowing air into it, wate changing into ice on cooling, wax changing into liquid on heating. etc. | 4. For example – milk changes into curd, iron changes to rust, burning of paper, cooking of food, etc. |
The Ever Evolving World of Science Class 7 Case Based Questions
1. Read the following passage carefully and answer the questions that follow:
When we grow, changes occur in our bodies. Plants also grow. We need food to grow. There are some life processes in our body to grow like we eat, we breath, our blood circulates nutrients in our body. The plants require food to grow. The growth is a permanent but irreversible increase in volume, mass, length followed by increase in weight of a living being (plant/animal).
(i) Name some life processes related to growth:
(a) we eat to grow
(b) need food to grow
(c) our blood circulates nutrients in body to grow
(d) All of these
Answer:
(d) All of the
(ii) The growth of a plant or animal is a:
(a) permanent change
(b) irreversible change
(c) none of these
(d) both of these
Answer:
(d) both of these
(iii) How do plants get their food?
Answer:
Plants prepare their own food by using sunlight, water and carbon dioxide through a process called photosynthesis. This helps them grow, stay alive and provide food for other living beings too.
2. Read the following passage carefully and answer the questions that follow:
During a group discussion, students shared everyday changes they had observed-ice cubes melting, paper being folded, and balloons inflating or bursting. Their teacher explained that these are all examples of physical changes, which may alter the size, shape, or state of matter, but do not produce new substances. They also discussed reversible and irreversible changes.
(i) When ice melts into water, what type of change occurs?
(a) Physical and reversible
(b) Physical and irreversible
(c) Chemical and reversible
(d) Chemical and irreversible
Answer:
(a) Physical and reversible
(ii) Bursting of an inflated balloon is:
(a) A reversible physical change
(b) An irreversible physical change
(c) A chemical change
(d) A periodic change
Answer:
(b) An irreversible physical change
(iii) Folding paper into different shapes (like origami) is classified as:
(a) Physical and irreversible
(b) Chemical and irreversible
(c) Physical and reversible
(d) Chemical and reversible
Answer:
(c) Physical and reversible
(iv) What is a common feature of all physical changes?
(a) Formation of a new substance
(b) Permanent colour change
(c) Only physical properties like shape or state change
(d) Emission of light
Answer:
(c) Only physical properties like shape or state change
(iv) Explain the difference between physical and chemical changes with examples.
Ans.
Physical Change & Chemical Change
Altering a substance’s form or appearance without changing its chemical makeup. & A change that produces new substances with different properties.
The Ever Evolving World of Science Class 7 Picture Based Questions
Question 1.
Look at the pictures and answer the question:
(i) What inspired the early scientific exploration of flight?
(a) Observing the movement of the sun
(b) Experimenting with electricity
(c) Watching planes fly
(d) Studying the wings of birds
Answer:
(d) Studying the wings of birds
(ii) What does science help us do according to the chapter?
(a) Answer only factual questions
(b) Develop new technologies
(c) Understand and explore the environment
(d) Memorize important dates
Answer:
(c) Understand and explore the environment
(iii) What does the chapter suggest about human activities and nature?
(a) They are not connected
(b) They are linked and affect the environment
(c) Human activities have no impact on nature
(d) Human activities only affect animals
Answer:
(b) They are linked and affect the environment
Question 2.
Look at the pictures and answer the question:
(i) What is the change called of evaporation of water?
(a) Physical change
(b) Chemical change
(c) No change
(d) Both (a) and (b)
Answer:
(a) Physical change
(ii) In which form water evaporates?
(a) Liquid
(b) Steam (gaseous)
(c) None of these
(d) Both (a) and (b)
Answer:
(b) Steam (gaseous)
(iii) Define evaporation.
Answer:
It is a natural process that plays a crucial role in the water cycle.
The Ever Evolving World of Science Extra Questions for Practice
Multiple Choice Questions (MCQs):
Question 1.
Tick (✓) mark the correct:
(a) World of science covers everything
(b) It is a way of thinking
(c) It is a way to understand our place in planet.
(d) All of these
Question 2.
The following are classified on the basis of their properties:
(a) metals
(b) non-metals
(c) Both a and b
(d) None of these
Question 3.
Some examples of physical changes are:
(a) ice melts
(b) glaciers metls
(c) water evaporates from sea
(d) All of these
Question 4.
Changes in our bodies are due to:
(a) eating
(b) breathing
(c) circulation of nutrients
(d) All of the above
Very Short Answer Type Questions:
Question 1.
Define science.
Question 2.
The position of shadows in the Sun was used by early humans to measure time. Is it true?
Question 3.
What is fascinating eclipse?
Question 4.
What does this chapter highlight?
Question 5.
Why are certain fruits sour?
Short Answer Type Questions:
Question 1.
What happens when things are heated?
Question 2.
How do human activities link to environment challenges?
Question 3.
How do we measure time ?
Question 4.
Differentiate between reversible and irreversible changes
Question 5.
How does heat flow in materials?
Question 6.
Classify materials on basis of their properties.
Question 7.
Write any four chemical changes.
Question 8.
Give four examples – how heat flows.
Question 9.
Write two lines on each of the following:
(a) light
(b) shadow
(c) sun
(d) moon
Question 10.
Mention four points about the wonderful world we live in.
Long Answer Type Questions:
Question 1.
Mention some activities that are a threat to our environment.
Question 2.
Write any four properties of materials.
Question 3.
Explain an activity about a physical or chemical change.
Question 4.
How does time and light play role in our daily life?