VSAQ for Chapter 1 The Ever-Evolving World of Science Class 7 Science NCERT
Important Questions1
Q1: What is the shape of the Earth’s orbit around the Sun?
Answer
The Earth moves around the Sun in a nearly circular path called an orbit.
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Q2: What inspired real scientific explorations of flight?
Answer
Paper planes helped scientists understand how objects can fly through the air.
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Q3: What is the duration of the Earth’s revolution around the Sun?
Answer
It takes the Earth one whole year (365 days) to complete one trip around the Sun.
Earth's Revolution
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Q4: What does the tilt of the Earth’s axis cause?
Answer
The tilt makes different parts of Earth get sunlight differently, creating seasons.
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Q5: What can be explored with electric batteries, lamps, and wires?
Answer
These tools help us study how electricity works and flows.
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Q6: What happens to materials when they are heated?
Answer
Heating can make materials change their shape, size, or state.
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Q7: What is one example of an irreversible change?
Answer
Once a battery is used up, it cannot be changed back to new again.
Reversible and Irreversible Changes
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Q8: How does water flow in the environment?
Answer
Water moves below the ground through soil and rocks.
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Q9: What are life processes essential for survival?
Answer
Eating gives energy needed for all life activities.
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Q10: Do plants also need food to grow?
Answer
Plants make their own food using sunlight to grow healthy.
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Q11: What was the way early humans measured time?
Answer
They used the length and position of shadows to tell the time.
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Q12: Why is light important for us?
Answer
Light helps our eyes see things around us.
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Q13: What causes eclipses?
Answer
Eclipses happen when one object’s shadow falls on another.
Eclipses
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Q14: How does the Earth rotate to cause day and night?
Answer
Earth spins around its axis, making day and night.
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Q15: How does the Earth’s movement around the Sun affect us?
Answer
As Earth moves around the Sun, the tilt causes different seasons.
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Q16: What happens during a solar eclipse?
Answer
The Moon blocks the Sun’s light, causing a solar eclipse.
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Q17: What is a lunar eclipse?
Answer
The Earth’s shadow falls on the Moon, causing a lunar eclipse.
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Q18: Can we safely view a lunar eclipse with our naked eye?
Answer
Lunar eclipses are safe to watch without special glasses.
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Q19: What causes the stars to appear to move in the sky?
Answer
Earth’s spinning makes stars seem like they move across the sky.
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Q20: How is the Earth’s axis related to the seasons?
Answer
The slant (tilt) of Earth’s axis causes seasons to change.
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Q21. 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.
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Q22. 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.
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Q23. 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.
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Q24. How do human activities link to environmental challenges?
Answer
Human actions affect nature and society, and science helps us understand this connection to work toward a sustainable future.
Our Environment
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Q25. 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.
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