MCQs-Exploring the Investigative World of Science-Class 8 -

Multiple Choice Questions for Chapter 1 Exploring the Investigative World of Science in Class 8-Science

Multiple Choice Questions:

1. What does science begin with?
a) Facts
b) Experiments
c) Wonder and questions
d) Proof
Answer: c

2. What did we learn in Grade 7 about science?
a) It is fixed
b) It is evolving
c) It is only experimental
d) It is only theoretical
Answer: b

3. What does investigating in science mainly involve?
a) Memorising facts
b) Asking questions and experimenting
c) Reading books only
d) Watching videos
Answer: b

4. Which everyday example shows scientific investigation?
a) Puri puffing up in oil
b) Stars twinkling
c) Sun rising
d) Rainbow forming
Answer: a

5. In a scientific experiment, how many variables should we change at a time?
a) Many
b) Only one
c) None
d) Randomly
Answer: b

6. Which of the following can be controlled while frying puris?
a) Oil temperature
b) Dough thickness
c) Dough size
d) All of these
Answer: d

7. What does systematic investigation involve?
a) Guessing results
b) Random trials
c) Careful observation and recording
d) Avoiding note-taking
Answer: c

8. What do scientists still not completely understand?
a) Moon phases
b) Puri puffing up
c) Gravity
d) Photosynthesis
Answer: b

9. What does investigative science require?
a) Observation and creativity
b) Memorisation
c) Theory only
d) Calculations only
Answer: a

10. Which two effects are shown by electric current?
a) Heating and magnetic effect
b) Light and pressure
c) Sound and gravity
d) None
Answer: a

Few More

11. What can force explain?
a) Ball falling down
b) Car stopping with brakes
c) Movement of air
d) All of these
Answer: d

12. How is pressure defined?
a) Force per unit volume
b) Force per unit area
c) Area per unit force
d) Work per unit force
Answer: b

13. What can small air pressure differences cause?
a) Only gentle breeze
b) Only cyclones
c) Both breeze and cyclones
d) No effect
Answer: c

14. How do particles behave in solids?
a) Move freely
b) Cannot move much
c) Do not exist
d) Move randomly
Answer: b

15. How can materials be classified?
a) Elements
b) Compounds
c) Mixtures
d) All of these
Answer: d

16. What is sugar dissolving in tea an example of?
a) Mixture
b) Solution
c) Compound
d) Element
Answer: b

17. What surfaces can reflect light?
a) Mirrors only
b) Rough surfaces
c) Moon
d) All of these
Answer: d

18. What does bending of light through lenses help us understand?
a) Forces
b) Pressure
c) Light refraction
d) Magnetism
Answer: c

19. What causes phases of the Moon?
a) Earth’s rotation
b) Earth–Moon–Sun positions
c) Moon’s distance from Earth
d) None
Answer: b

20. What were calendars first based on?
a) Sun only
b) Moon only
c) Sunrises, sunsets, and lunar cycles
d) Stars only
Answer: c

21. On what do ecosystems depend?
a) Air, water, sunlight
b) Living organisms
c) Both a and b
d) None
Answer: c

22. Why is Earth suitable for life?
a) Distance from Sun
b) Oxygen in atmosphere
c) UV protection
d) All of these
Answer: d

23. What is caused by human activities?
a) Stable climate
b) Climate change
c) No impact
d) Global cooling only
Answer: b

24. How does science help us?
a) Understand changes
b) Guide actions
c) Both a and b
d) None
Answer: c

25. What can a kitchen be used as besides cooking?
a) A library
b) A laboratory
c) A useless place
d) A storeroom
Answer: b

26. Why is keeping notes important in experiments?
a) Optional
b) Helps track observations
c) Useless
d) Time-wasting
Answer: b

27. Why does a puri puff up?
a) Gas expands inside
b) It burns
c) It cools
d) None
Answer: a

28. When does a phulka swell?
a) Fried in oil
b) On open flame
c) In water
d) On cold pan
Answer: b

29. Which is NOT a correct investigation practice?
a) Pricking puri before frying
b) Measuring puffing time
c) Changing many variables at once
d) Using same conditions
Answer: c

30. What does creative thinking in science mean?
a) Imagination without observation
b) Balancing ideas with observation
c) Ignoring experiments
d) Copying results
Answer: b

31. Which symbol in the book represents grounded knowledge?
a) Kite
b) Root
c) Star
d) Moon
Answer: b

32. Which symbol represents curiosity and exploration?
a) Kite
b) Root
c) Sun
d) Tree
Answer: a

33. What natural phenomenon explains cyclones?
a) Pressure differences in air
b) Earthquakes
c) Moon’s gravity
d) Reflection of light
Answer: a

34. Which is a pure substance?
a) Mixture
b) Compound
c) Element
d) Both b and c
Answer: d

35. What is the main principle of investigation?
a) Ask, observe, experiment, explain
b) Memorise and recite
c) Guess and leave
d) Copy others
Answer: a

True / False

A systematic investigation requires changing many variables at once. False
A kite symbolises curiosity and exploration in science. True
Pressure is defined as force per unit area. True
The Moon reflects light from the Sun. True
Human activities have no role in climate change. False

Fill in the blanks:

Science begins with ………….. and questions.
The puffing of a puri is caused by the expansion of ………… inside.
Solids are made of particles that ………… move much.
Calendars were based on observations of ……………,…………., and lunar cycles.
Earth is suitable for life because it is at a …………. distance from the Sun.

Answer: 1-wonder, 2- gas/steam, 3- cannot, 4- sunrises, sunsets, 5- perfect/right

Match the following:

A. Find the correct match

Set 1
a) Root → Based on Sun & Moon cycles
b) Kite → Symbol of curiosity
c) Calendar → Symbol of grounded knowledge

Set 2
a) Force → Makes objects move/stop
b) Pressure → Caused by pressure difference
c) Cyclones → Force per unit area

Set 3
a) Solid → Particles move moderately
b) Liquid → Particles move little

c) Gas → Particles move freely

B. Find the incorrect match:

Set 4
a) Element → Made of different atoms
b) Compound → Two or more elements bonded
c) Mixture → Components separable physically

Set 5
a) Reflection → Bending through lenses
b) Refraction → Bending through lenses
c) Phases of Moon → Due to Earth–Moon–Sun position

Answer:

1- b) Kite → Symbol of curiosity

2- a) Force → Makes objects move/stop

3- c) Gas → Particles move freely

4- a) Element → Made of different atoms

5- a) Reflection → Bending through lenses

Assertion – Reason:

Options for all questions:
a) Both A and R are true, and R explains A
b) Both A and R are true, but R does not explain A
c) A is true, R is false
d) A is false, R is true

1.
Assertion (A): It is best to change only one factor in an experiment.
Reason (R): Changing many factors at once makes it hard to know what caused the result.
Answer: a

2.
Assertion (A): Earth supports life because it is at a suitable distance from the Sun.
Reason (R): This allows water to remain in liquid form.
Answer: a

3.
Assertion (A): The puffing of puri is completely understood by scientists.
Reason (R): Every experiment gives a definite answer.
Answer: d (Both A and R are false → A false, R false)

4.
Assertion (A): Pressure differences in air cause winds and cyclones.
Reason (R): Air always moves from low pressure to high pressure.
Answer: c (A true, R false → actually air moves from high to low pressure)

5.
Assertion (A): Ecosystems depend on air, water, sunlight, and organisms.
Reason (R): All living beings interact with their surroundings.
Answer: a

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MCQs-Exploring the Investigative World of Science-Class 8