Important question answers Chapter 1 The Ever-Evolving World of Science Class 7 Subject Science
Multiple Choice Questions (1 mark each)
- What does science help us understand?
A) Only machines
B) Only planets
C) The world around us
D) Only humans
✅ Answer: C) The world around us - What is one thing we need to make a bulb glow in a circuit?
A) Plastic pipe
B) Paper clip
C) Metal spoon
D) Wooden stick
✅ Answer: C) Metal spoon - Which of these is an example of a reversible change?
A) Melting of ice
B) Burning wood
C) Cooking rice
D) Rusting of iron
✅ Answer: A) Melting of ice - What helps water evaporate from the sea?
A) Moonlight
B) Wind
C) Heat from the Sun
D) Rain
✅ Answer: C) Heat from the Sun - Why do some fruits taste sour?
A) Because they are dirty
B) Because they are not fruits
C) Because of the acids in them
D) Because they are old
✅ Answer: C) Because of the acids in them - What can cause fruits to ripen faster?
A) Cold weather
B) Heating
C) Keeping them in water
D) Putting them in the fridge
✅ Answer: B) Heating - What do you need to become a science explorer?
A) Curiosity
B) Money
C) A lab coat
D) Computer
✅ Answer: A) Curiosity - What do children use to observe light in the experiment shown?
A) Pen
B) Water glass
C) Torch
D) Both B and C
✅ Answer: D) Both B and C - How does the Sun help in forming rain?
A) By freezing water
B) By evaporating water
C) By eating clouds
D) By blowing wind
✅ Answer: B) By evaporating water - Which of these is an example of a natural change?
A) Melting butter
B) Building a chair
C) Growing a plant
D) Cutting paper
✅ Answer: C) Growing a plant - What natural force makes glaciers melt?
A) Wind
B) Rain
C) Heat from the Sun
D) Moonlight
✅ Answer: C) Heat from the Sun - What kind of material is a spoon made of, used in the electric circuit experiment?
A) Wood
B) Plastic
C) Metal
D) Rubber
✅ Answer: C) Metal - Which of the following changes is irreversible?
A) Freezing of water
B) Melting of butter
C) Ripening of fruits
D) Folding of paper
✅ Answer: C) Ripening of fruits - What important qualities should a young scientist have?
A) Anger
B) Curiosity
C) Laziness
D) Fear
✅ Answer: B) Curiosity - Which of these is shown by the movement of clouds and rain?
A) Water cycle
B) Soil erosion
C) Air pollution
D) Fossil formation
✅ Answer: A) Water cycle - Which planet do we study to learn about day and night?
A) Mars
B) Earth
C) Venus
D) Mercury
✅ Answer: B) Earth - How does light help humans other than seeing?
A) Helps plants fly
B) Helps plants grow
C) Helps in cooking
D) Helps in making rain
✅ Answer: B) Helps plants grow - What is needed to form rain after evaporation?
A) Condensation
B) Freezing
C) Melting
D) Solidification
✅ Answer: A) Condensation - What device uses the position of the shadow to tell time?
A) Torch
B) Sundial
C) Clock
D) Watch
✅ Answer: B) Sundial - When does a solar eclipse happen?
A) Earth comes between Sun and Moon
B) Moon comes between Sun and Earth
C) Sun comes between Earth and Moon
D) Sun disappears
✅ Answer: B) Moon comes between Sun and Earth - What happens when we wash a haldi (turmeric) stain with soap?
A) Stain becomes darker
B) Stain becomes lighter
C) Stain becomes invisible
D) Stain turns red
✅ Answer: D) Stain turns red - Who studies bird wings to design airplanes?
A) Farmers
B) Engineers
C) Doctors
D) Artists
✅ Answer: B) Engineers - What is an example of a chemical change?
A) Boiling water
B) Breaking glass
C) Ripening fruits
D) Cutting wood
✅ Answer: C) Ripening fruits - Which of these is NOT a reason why science is important?
A) It helps us ask questions.
B) It helps us sleep longer.
C) It helps us explore new ideas.
D) It helps us find patterns in nature.
✅ Answer: B) It helps us sleep longer. - What happens to water when it gets heated by the Sun?
A) It freezes
B) It becomes air
C) It evaporates
D) It solidifies
✅ Answer: C) It evaporates
Short Answer Questions (2 Marks Each)
- What is meant by reversible and irreversible changes?
✅ Answer:
- Reversible change: Can be undone (e.g., melting of ice).
- Irreversible change: Cannot be undone (e.g., burning paper).
- Why is heat important in changes around us?
✅ Answer:
- Heat helps things change faster.
- It causes ice to melt and fruits to ripen.
- Give two examples of materials that conduct electricity.
✅ Answer:
- Metals like copper and iron.
- Materials like steel spoons.
- What happens when a torch battery runs out?
✅ Answer:
- The battery cannot be used again.
- The torch stops working.
- What does curiosity help us do in science?
✅ Answer:
- It helps us ask questions.
- It leads us to new discoveries.
Medium Answer Questions (3 Marks Each)
- What do we learn by using batteries, wires, and bulbs in experiments?
✅ Answer:
- Which materials conduct electricity.
- The difference between metals and non-metals.
- How electric circuits work.
- Describe the water cycle using terms from the lesson.
✅ Answer:
- Water evaporates due to the Sun’s heat.
- Forms clouds and falls as rain.
- Rainwater goes into the ground or rivers.
- Why do we need to step outside the classroom to learn science?
✅ Answer:
- To observe real-life changes.
- To connect science with daily life.
- To understand the environment better.
- How did people measure time before clocks were invented?
✅ Answer:
- By observing shadows.
- Using sundials and positions of the Sun.
- Watching changes like day and night.
- What happens during an eclipse?
✅ Answer:
- The Earth or Moon casts a shadow.
- The Sun is covered partially or fully.
- We see this as an eclipse.
Long Answer Questions (5 Marks Each)
- Explain how science connects with real life using any 5 examples from the chapter.
✅ Answer:
- Fruit ripening shows chemical change.
- Melting ice shows heat transfer.
- Using metal in a circuit shows conductivity.
- Water cycle shows evaporation and rain.
- Eclipse shows movement of Earth and Moon.
- How does science help in building a sustainable world?
✅ Answer:
- Helps understand nature.
- Teaches how to reduce pollution.
- Helps in saving energy.
- Encourages recycling.
- Promotes responsibility toward the planet.
- What are some of the questions we can ask as young scientists? Give 5 examples.
✅ Answer:
- Why do some fruits taste sour?
- How does light make shadows?
- Why do batteries stop working?
- How does the Sun cause rain?
- Why do we see eclipses?
- Describe how heat flows using three examples from the textbook.
✅ Answer:
- Ice cube melts in a glass due to heat.
- Glacier melts due to the Sun’s heat.
- Fruits ripen faster when heated.
To Learn Click Below:
MCQs :-
Exploring Substances: Acidic, Basic, and Neutral
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Important Questions Answers:
Exploring Substances: Acidic, Basic, and Neutral
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