Important Questions: The Wonderful World of Science

Q1: What is the foundation of science?

a) Curiosity
b) Mathematics
c) Technology
d) Books

Ans: a. Curiosity. 
Curiosity makes us notice things, ask questions and look for answers; it is the first step that starts scientific investigation.  

Q2: At what temperature does water freeze to become ice?
a) 0°C
b) 100°C
c) 50°C
d) -10°C

Ans: a. 0°C. 
Water turns into ice at 0°C under normal (sea-level) conditions. 

Q3: Which step of the scientific method involves making a smart guess?
a) Observe
b) Ask a Question
c) Make a Guess (Hypothesis)
d) Check the Results

Ans: c. Make a Guess (Hypothesis). 
A hypothesis is an idea we can test by doing experiments or observations.  

Q4: What is the process called when a caterpillar turns into a butterfly?
a) Photosynthesis
b) Metamorphosis
c) Germination
d) Evaporation

Ans: b. Metamorphosis. 
It is the life-process in which an animal changes its form as it grows, as in caterpillar → pupa → butterfly.  

Q5: Which material is commonly used to make a ruler?
a) Metal
b) Plastic
c) Fabric
d) Rubber

Ans: b. Plastic. 
Rulers are often made from plastic (and sometimes wood or metal) because plastic is lightweight and easy to mark. 

Q6: What do plants in a forest ecosystem produce that is essential for animals?
a) Water
b) Soil
c) Oxygen
d) Light

Ans: c. Oxygen. 
Through photosynthesis, plants release oxygen which animals need to breathe and survive.  

Q7: What is the purpose of recycling materials like paper and plastic?
a) To make them heavier
b) To separate and reuse them
c) To burn them
d) To mix them together

Ans: b. To separate and reuse them. 
Recycling saves resources, reduces waste and helps protect the environment.  

Q8: What form of water is steam?
a) Solid
b) Liquid
c) Gas
d) Crystal

Ans: c. Gas. 
Steam is water in gaseous form, produced when water is heated. 

Q9: Why do stars shine in the night sky?
a) Due to reactions happening inside them
b) Because they reflect moonlight
c) Because they are hot rocks
d) Due to electricity

Ans: a. Due to reactions happening inside them. 
Inside stars, energy-producing reactions create heat and light, which we see as shining.  

Q10: What is measured to know how hot or cold something is?
a) Weight
b) Temperature
c) Volume
d) Length

Ans: b. Temperature. 
Temperature tells us how hot or cold an object is and is measured with a thermometer.  

Q11: Define science and give one example of how it helps us.

Ans: Science is a way of thinking and finding out about the world by observing, asking questions, and testing ideas. For example, science helps farmers grow better crops by teaching them which seeds, soil and watering methods work best.  

Q12: What is curiosity, and why is it important in science?

Ans: Curiosity is the desire to learn or know more. It is important in science because it makes people ask questions, explore new ideas and carry out experiments that lead to discoveries.  

Q13: Name the three forms of water and their states.

Ans: The three forms of water are ice (solid), water (liquid), and steam or water vapour (gas). 

Q14: What are ecosystems, and give one example of an ecosystem?

Ans: Ecosystems are communities where plants, animals and non-living things (like soil, water and air) interact. An example is a forest, where trees, animals, insects and soil organisms live together and depend on each other.  

Q15: List two steps of the scientific method with an example for each.

Ans: 1. Observe: Noticing a plant leaning towards a window (it moves towards light).
2. Ask a Question: Why does the plant grow towards the light?  

Q16: Explain the scientific method with an example of a problem and how it can be solved using its steps.

Ans: The scientific method is a clear, step-by-step way to find answers. Its steps are:  

1. Observe: Notice something, e.g., a pen stops writing.
2. Ask a Question: Why did the pen stop writing?
3. Make a Guess (Hypothesis): The ink might be finished.
4. Test It (Experiment): Open the pen or try it on paper to check the ink.
5. Check the Results (Analysis): If no ink appears, the hypothesis is supported; if ink appears, the hypothesis is not correct and you test another idea (e.g., the pen tip is clogged).
6. Decide (Conclusion): Conclude whether the ink finished or another cause was found. This method helps find reliable answers by testing ideas one by one.

Q17: Describe the importance of water and its properties, including how it affects daily life.

Ans: Water is essential for all life and for many daily activities.  

• Properties: It exists as ice (solid) at 0°C, as liquid water at ordinary temperatures, and as steam (gas) at 100°C at sea level.
• Water changes state (melting, evaporating, condensing), which is important for the water cycle and weather.
• Daily life: People use water for drinking, cooking, cleaning, bathing and farming; crops need water to grow.
• Knowing these properties helps us save and use water wisely, for example in irrigation and household use.

Q18: Discuss how science helps us understand ecosystems and food, with examples.

Ans: Science explains how living things interact and how food is produced and used.  

• In ecosystems, science shows how plants make food and oxygen for animals and how different species depend on each other (for example, trees provide fruit and shelter for birds).
• For food, science teaches how seeds grow into crops using sunlight, water and nutrients, helping farmers improve yields (for example, choosing the right methods for growing rice or wheat).
• Science also helps us understand nutrition and how to store and prepare food safely, which supports health and farming practices.