Chapter: Exploring the Investigative World of Science
Total MCQs: 25
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Q1. Science usually begins with which of the following?
A. Memorising facts
B. Wonder and curiosity
C. Writing long answers
D. Doing homework
Show Answer & Explanation
Answer: B. Wonder and curiosity
Explanation: The chapter explains that science begins with wonder and simple “Why” and “How” questions about the world.
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Q2. Investigation in science mainly means:
A. Reading only textbooks
B. Asking focused questions and doing experiments
C. Watching TV
D. Memorising formulas
Show Answer & Explanation
Answer: B. Asking focused questions and doing experiments
Explanation: Scientific investigation involves asking questions, designing experiments, observing and explaining results.
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Q3. Students are encouraged to become:
A. Only readers
B. Only writers
C. Investigators and young scientists
D. Teachers
Show Answer & Explanation
Answer: C. Investigators and young scientists
Explanation: The chapter encourages students to act like investigators and explore real-world problems.
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Q4. The root symbol on the textbook pages represents:
A. Trees
B. Environment only
C. Deep foundation of knowledge
D. Farming
Show Answer & Explanation
Answer: C. Deep foundation of knowledge
Explanation: The root symbol represents strong foundation of knowledge connected to environment and traditions.
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Q5. The kite symbol in the textbook represents:
A. Flying toys
B. Freedom of creative thinking and curiosity
C. Wind energy
D. Weather
Show Answer & Explanation
Answer: B. Freedom of creative thinking and curiosity
Explanation: The kite symbol shows curiosity and ideas flying towards new discoveries.
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Q6. Tiny organisms present in a drop of water are called:
A. Stones
B. Microbes
C. Metals
D. Dust
Show Answer & Explanation
Answer: B. Microbes
Explanation: The chapter mentions that a drop of water contains tiny organisms called microbes.
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Q7. Some microbes are useful because they:
A. Break stones
B. Produce medicines and help digestion
C. Increase pollution
D. Destroy food
Show Answer & Explanation
Answer: B. Produce medicines and help digestion
Explanation: Some microbes help in digestion and production of medicines.
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Q8. Which of the following helps us stay healthy and fight infections?
A. Junk food
B. Exercise, nutritious food, medicines and vaccines
C. Sleeping all day
D. Playing games only
Show Answer & Explanation
Answer: B. Exercise, nutritious food, medicines and vaccines
Explanation: The chapter explains these help us stay healthy and fight infections.
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Q9. Heating effect and magnetic effect are related to:
A. Water
B. Air
C. Electric current
D. Soil
Show Answer & Explanation
Answer: C. Electric current
Explanation: Electric current produces heating effect and magnetic effect used in machines.
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Q10. Forces can change:
A. Colour of object
B. Shape only
C. Speed, direction, or motion
D. Temperature only
Show Answer & Explanation
Answer: C. Speed, direction, or motion
Explanation: Forces can make objects speed up, slow down or change direction.
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Q11. Pressure is defined as:
A. Force on object
B. Force per area
C. Area per force
D. Speed per area
Show Answer & Explanation
Answer: B. Force per area
Explanation: Pressure is how force is distributed over an object.
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Q12. Small differences in air pressure can cause:
A. Earthquake
B. Gentle breeze
C. Volcano
D. Flood
Show Answer & Explanation
Answer: B. Gentle breeze
Explanation: Small pressure differences cause breeze, large differences cause storms.
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Q13. Everything around us is made of:
A. Water
B. Dust
C. Tiny particles
D. Light
Show Answer & Explanation
Answer: C. Tiny particles
Explanation: The chapter explains that all matter is made of tiny particles.
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Q14. In which state do particles move freely?
A. Solid
B. Liquid
C. Gas
D. Wood
Show Answer & Explanation
Answer: C. Gas
Explanation: Particles in gases move freely while in solids they cannot move much.
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Q15. Pure substances are called:
A. Mixtures
B. Compounds
C. Elements
D. Solutions
Show Answer & Explanation
Answer: C. Elements
Explanation: Elements are pure substances made of only one type of material.
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Q16. Sugar dissolving in tea is an example of:
A. Element
B. Compound
C. Solution
D. Gas
Show Answer & Explanation
Answer: C. Solution
Explanation: When sugar dissolves in tea, it forms a solution.
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Q17. Light rays reflect from:
A. Only mirrors
B. Only water
C. Both smooth and rough surfaces
D. Only glass
Show Answer & Explanation
Answer: C. Both smooth and rough surfaces
Explanation: The chapter states even rough surfaces and the Moon reflect light.
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Q18. Phases of the Moon occur due to:
A. Earth rotation
B. Relative positions of Earth, Moon and Sun
C. Clouds
D. Wind
Show Answer & Explanation
Answer: B. Relative positions of Earth, Moon and Sun
Explanation: Different positions cause different parts of the Moon to be illuminated.
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Q19. Early calendars were based on observations of:
A. Rivers
B. Trees
C. Sunrises, sunsets and Moon cycles
D. Animals
Show Answer & Explanation
Answer: C. Sunrises, sunsets and Moon cycles
Explanation: Humans used Sun and Moon cycles to make calendars.
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Q20. Living organisms and their environment together form:
A. Society
B. Ecosystem
C. Community
D. Population
Show Answer & Explanation
Answer: B. Ecosystem
Explanation: Ecosystems include living organisms and their environment.
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Q21. Earth is suitable for life mainly because:
A. It is very hot
B. It is very cold
C. It is at perfect distance from the Sun and has atmosphere
D. It has mountains
Show Answer & Explanation
Answer: C. It is at perfect distance from the Sun and has atmosphere
Explanation: Earth has liquid water and oxygen due to its distance and atmosphere.
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Q22. Human activities can affect:
A. Only rivers
B. Only forests
C. Earth’s climate
D. Only animals
Show Answer & Explanation
Answer: C. Earth’s climate
Explanation: Human activities can change Earth’s temperature and climate patterns.
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Q23. Science experiments should change:
A. Many things at once
B. Only one thing at a time
C. Nothing
D. Everything
Show Answer & Explanation
Answer: B. Only one thing at a time
Explanation: For proper investigation, only one variable should be changed at a time.
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Q24. Writing observations during experiments is important because:
A. Teacher says so
B. To remember results and analyse later
C. To fill notebook
D. No reason
Show Answer & Explanation
Answer: B. To remember results and analyse later
Explanation: Notes help scientists analyse and understand experiment results.
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Q25. The method of doing experiments step by step is called:
A. Random testing
B. Systematic investigation
C. Guess method
D. Rough work
Show Answer & Explanation
Answer: B. Systematic investigation
Explanation: Scientific experiments follow systematic investigation methods.
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