MCQs for Exploring the Investigative World of Science chapter 1 for class 8 NCERT book. We have 30 MCQ questions in this and 2 match the following in addition to fill in the blanks and true and false questions. This is from new book Curiosity textbook for science for grade 8.
The Class 8 Science MCQ for Chapter 1, Exploring the Investigative World of Science, helps students understand what science really means and how it is studied.
Important Definitions and Key Points from Chapter 1
- Science: Science is the study of the natural world based on observation, testing, and evidence.
- Observation: Observation is all about noticing facts, objects, events, or changes using our senses/tools.
- Hypothesis: A hypothesis is a set of possible answer that can be tested.
- Experiment: An experiment is a planned test. It is done to check if an idea is correct.
- Inference: An inference is a conclusion drawn from observation and reasoning.
- Data: A data is the information collected during an activity, survey, or experiment.
- Conclusion: A conclusion is a final understanding that comes after studying the results.
- Scientific Method: The scientific method is the step-by-step way of asking questions, testing ideas, recording results, and drawing conclusions.
- Measurement: Measurement is the process of comparing an unknown quantity with a standard unit.
- SI Units: SI units are the standard units used in science all over the world.
- Length: Length is the distance between two points. Its SI unit is metre (m).
- Mass: Mass is the amount of matter in an object. Its SI unit is kilogram (kg).
- Time: Time is the duration between two events. Its SI unit is second (s).
- Temperature: Temperature tells how hot or cold a body is. It is commonly measured in degree Celsius (°C).
- Area Formula: Area of a rectangle = length × breadth.
- Perimeter Formula: Perimeter of a rectangle = 2 × (length + breadth).
- Average Formula: Average = Sum of observations ÷ Number of observations.
- Fair Test: A fair test is an experiment in which only one factor is changed while the others are kept the same.
Class 8 Science Chapter 1 Exploring the Investigative World of Science MCQ Online Test Questions and Answers
Question 1. Science often begins when we start asking questions about the world around us. Which pair of questions best represents scientific curiosity?
a) Who and when
b) Why and how
c) Where and whose
d) Which and whom
Answer:
b) Why and how
Question 2. In science, investigation means:
a) Memorising answers from a guide
b) Asking focused questions and finding ways to answer them
c) Avoiding experiments completely
d) Guessing the result before observing
Answer:
b) Asking focused questions and finding ways to answer them
Question 3. A good scientific investigation usually includes observation, questioning, and:
a) Random guessing
b) Thoughtful experimentation
c) Ignoring results
d) Copying from others
Answer:
b) Thoughtful experimentation
Question 4. In a scientific experiment, observations are useful because they help us to:
a) Improve our understanding
b) Skip the conclusion
c) Avoid asking new questions
d) Prove every guess correct
Answer:
a) Improve our understanding
Question 5. Which of the following is the best example of a focused scientific question?
a) Science is fun
b) Why does dough rise?
c) I like experiments
d) The sky is blue
Answer:
b) Why does dough rise?
Question 6. Science works best when we balance careful observation with:
a) Fear of failure
b) Creative thinking
c) Fast writing
d) Loud discussion
Answer:
b) Creative thinking
Question 7. A single drop of water may contain:
a) Only dissolved salts
b) A hidden world of tiny organisms
c) Only air bubbles
d) Only visible insects
Answer:
b) A hidden world of tiny organisms
Question 8. Some microbes are useful because they can:
a) Only damage crops
b) Help digest food and produce medicines
c) Stop all diseases naturally
d) Be seen clearly without tools
Answer:
b) Help digest food and produce medicines
Question 9. Some microbes are harmful because they may:
a) Cause infections
b) Reflect light
c) Produce magnets
d) Form clouds
Answer:
a) Cause infections
Question 10. Which of the following helps our body stay healthy and fight infections?
a) Only rest
b) Nutritious food, exercise, medicines, and vaccines
c) Only drinking water
d) Only sleeping longer
Answer:
b) Nutritious food, exercise, medicines, and vaccines
Question 11. The heating effect of electric current is commonly used to:
a) Keep us warm
b) Make leaves green
c) Change moon phases
d) Separate mixtures
Answer:
a) Keep us warm
Question 12. The magnetic effect of electric current helps in:
a) Dissolving sugar in tea
b) Running motors and machines
c) Forming pressure in liquids
d) Making microbes useful
Answer:
b) Running motors and machines
Question 13. A force can change the motion of an object by making it:
a) Only heavier
b) Speed up, slow down, or change direction
c) Turn into a liquid
d) Glow in the dark
Answer:
b) Speed up, slow down, or change direction
Question 14. When a ball thrown upward falls back to the ground, it shows that force can:
a) Change only colour
b) Affect motion
c) Produce light
d) Dissolve solids
Answer:
b) Affect motion
Question 15. Pressure tells us how:
a) Particles are coloured
b) Force is distributed over an object
c) Light bends in glass
d) Sound travels in air
Answer:
b) Force is distributed over an object
Question 16. A small difference in air pressure can produce:
a) A gentle breeze
b) An earthquake
c) A solar eclipse
d) A volcano
Answer:
a) A gentle breeze
Question 17. A strong difference in air pressure can sometimes lead to:
a) Dew drops
b) Cyclones
c) Shadows
d) Rainbows
Answer:
b) Cyclones
Question 18. To understand why water boils or how air exerts pressure, scientists study:
a) The colour of materials
b) The particles that make up materials
c) The shape of notebooks
d) The age of the objects
Answer:
b) The particles that make up materials
Question 19. Everything around us is made of:
a) Waves only
b) Tiny particles
c) Light only
d) Heat only
Answer:
b) Tiny particles
Question 20. In solid materials, particles usually:
a) Move around freely
b) Cannot move much
c) Fly away quickly
d) Mix by themselves
Answer:
b) Cannot move much
Question 21. In gases, particles usually:
a) Stay fixed in one place
b) Cannot be studied
c) Move around freely
d) Form crystals only
Answer:
c) Move around freely
Question 22. Materials can be classified into elements, compounds, and:
a) Cells
b) Mixtures
c) Rays
d) Roots
Answer:
b) Mixtures
Question 23. Sugar dissolving in tea is an example of:
a) Reflection
b) A solution
c) A force
d) Pressure
Answer:
b) A solution
Question 24. Light bends when it passes through:
a) Soil
b) Lenses
c) Cloth
d) Wood
Answer:
b) Lenses
Question 25. Which of the following can reflect light?
a) Only polished mirrors
b) Only transparent objects
c) Both rough surfaces and the Moon
d) Only stars
Answer:
c) Both rough surfaces and the Moon
Question 26. The different shapes of the Moon seen on different nights are called:
a) Moon shadows
b) Phases of the Moon
c) Solar patterns
d) Lunar rings
Answer:
b) Phases of the Moon
Question 27. The phases of the Moon are seen because of the relative positions of the:
a) Earth, Moon, and Sun
b) Sun, Mars, and Earth
c) Earth, stars, and clouds
d) Moon, clouds, and planets
Answer:
a) Earth, Moon, and Sun
Question 28. Early calendars were developed by observing:
a) Rocks and mountains
b) Sunrises, sunsets, and lunar cycles
c) Soil colour and rainfall only
d) Rivers and lakes only
Answer:
b) Sunrises, sunsets, and lunar cycles
Question 29. An ecosystem includes living organisms and their:
a) Toys
b) Environment
c) Names
d) Colours
Answer:
b) Environment
Question 30. In a fair experiment, the best method is to:
a) Change many things together
b) Change one factor at a time and keep others the same
c) Avoid writing observations
d) Stop after one guess
Answer:
b) Change one factor at a time and keep others the same
Question 31 – Match the Following
| Column A | Column B |
|---|---|
| 1. Useful microbes | A. Helps motors run |
| 2. Harmful microbes | B. Cause infections |
| 3. Heating effect of electric current | C. Help digest food or produce medicines |
| 4. Magnetic effect of electric current | D. Keeps us warm |
| 5. Pressure | E. Force distributed over an object |
Answer:
| Column A | Correct Answer |
|---|---|
| 1. Useful microbes | C. Help digest food or produce medicines |
| 2. Harmful microbes | B. Cause infections |
| 3. Heating effect of electric current | D. Keeps us warm |
| 4. Magnetic effect of electric current | A. Helps motors run |
| 5. Pressure | E. Force distributed over an object |
Question 32 – Match the Following
| Column A | Column B |
|---|---|
| 1. Solids | A. Sugar dissolving in tea |
| 2. Gases | B. Particles move around freely |
| 3. Solutions | C. Relative positions of Earth, Moon, and Sun |
| 4. Phases of the Moon | D. Particles cannot move much |
| 5. Systematic investigation | E. Changing one factor at a time |
Answer:
| Column A | Correct Answer |
|---|---|
| 1. Solids | D. Particles cannot move much |
| 2. Gases | B. Particles move around freely |
| 3. Solutions | A. Sugar dissolving in tea |
| 4. Phases of the Moon | C. Relative positions of Earth, Moon, and Sun |
| 5. Systematic investigation | E. Changing one factor at a time |
True or False type Questions for Class 8 Science Chapter 1 “Exploring the Investigative World of Science”
7 true or false questions based on Chapter 1, “Exploring the Investigative World of Science,” of the NCERT Science book for Class 8:
1. Science learning focuses only on memorising facts and not on discovering answers through investigation.
Answer:
False
2. Scientific investigation becomes stronger when careful observation is combined with creative thinking.
Answer:
True
3. Particles in gases remain fixed in one place and cannot move freely.
Answer:
False
4. Light can be reflected not only by polished mirrors but also by rough surfaces.
Answer:
True
5. The phases of the Moon occur because the Moon produces different amounts of its own light.
Answer:
False
6. Earth supports life partly because it has liquid water and an atmosphere containing oxygen.
Answer:
True
7. In a fair scientific test, many factors should be changed at the same time to get faster results.
Answer:
False
Fill in the Blanks Questions for Class 8 Science Chapter 1 “Exploring the Investigative World of Science”
7 fill-in-the-blank questions based on Chapter 1, “Exploring the Investigative World of Science,” of the NCERT Science book for Class 8 –
1. Science begins with a sense of ______ about the world around us.
Answer:
wonder
2. A large difference in air pressure can produce strong winds and even ______.
Answer:
cyclones
3. Substances can be grouped into elements, compounds, and ______.
Answer:
mixtures
4. The bending of light helps explain how corrective ______ improve vision.
Answer:
glasses
5. Small changes in Earth’s temperature can disturb long-term ______ patterns.
Answer:
climate
6. A step-by-step method used to find answers in science is called an ______.
Answer:
investigation
7. To make a scientific test reliable, only one factor should be changed at a ______.
Answer:
time
