All 24 MCQs of 9th Class Physics Chapter 9, Nature of Science, with answers and the reason each option is right or wrong: the 11 textbook exercise MCQs plus 13 more board-style MCQs. Punjab Board new syllabus.
Try each one first: tap an option to check it, then read the reasoning and why the others are wrong.
A note about the questions
The wording follows published solved exercises and every answer was re-checked by hand, so the wording or the order of options may differ slightly from your print.
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Set A: Textbook exercise 11 MCQs
The multiple-choice questions at the end of Chapter 9 in your book, in the book's option order.
Q9.1Science and Physics
Physics is a branch of:
Answer(c) physical science
Step by step
Biological sciences: living things (botany, zoology).
Physical sciences: non-living things (physics, chemistry, astronomy, geology).
Why the others are wrong
(a) social science studies society, not nature.
(b) life science is about living things.
(d) biological science is about living things.
Remember
Physics, chemistry: physical sciences.
Q9.2Science, Technology and Engineering
Which branch of science plays a vital role in technology and engineering?
Answer(d) physics
Step by step
Machines, electronics and communications all use physical laws.
So physics is the core of technology and engineering.
Why the others are wrong
(a) biology helps medicine and agriculture, but is not the core of engineering.
(b) chemistry is important, but physics is the core.
(c) geology studies the Earth.
Remember
Technology runs on physics.
Q9.3Science, Technology and Engineering
Automobile technology is based on:
Answer(d) thermodynamics
Step by step
The engine converts heat into mechanical work.
Heat and its conversion into work: thermodynamics.
Why the others are wrong
(a) acoustics is about sound.
(b) electromagnetism is the basis of motors and generators.
(c) optics is about light.
Remember
Engines = thermodynamics.
Q9.4Science, Technology and Engineering
A user-friendly software application of a smartphone uses:
Answer(b) information technology
Step by step
Software, apps and data: information technology.
Why the others are wrong
(a) laser technology is about lasers.
(c) medical technology is for diagnosis and treatment.
(d) the phone's hardware is electronics, but the app is software.
Remember
Software = IT.
Q9.5Science, Technology and Engineering
The working of refrigeration and air conditioning involves:
Answer(d) thermodynamics
Step by step
A fridge pumps heat out of its inside.
The study of heat and its transfer is thermodynamics.
Why the others are wrong
(a) its motor uses electromagnetism, but the cooling is thermodynamics.
(b) mechanics is about motion and forces.
(c) climate science studies the climate.
Remember
Heat moved about = thermodynamics.
Q9.6Scientific Method
What is the ultimate truth of a scientific method?
Answer(d) law
Step by step
Hypothesis → experiment → theory → repeated testing.
A theory accepted after many tests becomes a law, the final step.
Why the others are wrong
(a) a hypothesis is only a possible explanation, to be tested.
(b) experiments test a hypothesis; they are a step, not the outcome.
(c) a theory still has to pass repeated testing before it becomes a law.
Remember
The method ends at a law.
Q9.7Scientific Method
The statement "If I do not study for this test, then I will not get a good grade" is an example of:
Answer(c) prediction
Step by step
It says what will happen in future under a condition.
A statement of what is expected to happen is a prediction.
Why the others are wrong
(a) a theory explains causes and effects; this only forecasts one result.
(b) an observation records what has already been seen.
(d) a law is a well-tested general statement about nature.
Remember
"If ... then ..." = prediction.
Q9.8Scientific Method
Which of the following are methods of investigation?
Answer(d) all of these
Step by step
Observation, experiment and research all gather evidence.
Why the others are wrong
(a) true, but not the only one.
(b) true, but not the only one.
(c) true, but not the only one.
Remember
All three gather evidence.
Q9.9Scientific Method
A hypothesis:
Answer(d) all of these
Step by step
A hypothesis is a possible answer to a question, based on observations.
Experiments then look for evidence that supports it or not.
If a proposed hypothesis cannot be tested at all, it falls outside science.
Why the others are wrong
(a) Wrong alone — read as "some proposed hypotheses cannot be tested"; but that is not the whole answer.
(b) Wrong alone — a hypothesis that survives testing is supported by evidence, but that is not the whole answer.
(c) Wrong alone — true, but not the whole answer.
Remember
Book key: all of these.
Q9.10Scientific Method
A graph of organised data is an example of:
Answer(d) analysing data
Step by step
Collecting gives the numbers.
Plotting and reading a graph of them is analysis.
Why the others are wrong
(a) collecting comes before organising the data.
(b) a hypothesis is a proposed explanation.
(c) the question comes at the start.
Remember
Graph = analysis.
Q9.11Scientific Method
The colour of a door is brown. It is an example of:
Answer(a) observation
Step by step
It records something seen.
Nothing is explained or predicted.
Why the others are wrong
(b) a hypothesis would try to explain something.
(c) a prediction says what will happen.
(d) a law is a well-tested statement about nature.
Remember
Seen and noted = observation.
Set B: More MCQs from this chapter 13 MCQs
Extra questions on the same ideas, of the kind set in board papers and class tests.
QB1Science and Physics
Physics deals with matter, energy, space and time, and:
Answer(b) their mutual relationships and interactions
Step by step
Constituents: matter, energy, space, time.
Physics studies how they are related and interact.
Why the others are wrong
(a) living organisms are biology.
(c) chemical reactions are chemistry.
(d) society is social science.
Remember
Matter, energy, space, time and how they interact.
QB2Science and Physics
According to the special theory of relativity, for an observer moving at a very high speed, time:
Answer(b) passes more slowly
Step by step
Relativistic mechanics: time is not absolute.
At very high speeds, moving clocks run slow (time dilation).
Why the others are wrong
(a) it is the other way round.
(c) it slows, it does not stop.
(d) time never runs backwards.
Remember
Fast mover, slow clock.
QB3Branches and Interdisciplinary Fields
The branch of physics that deals with the nature and physical aspects of audible sound is:
Answer(b) acoustics
Step by step
Sound: acoustics. Light: optics.
Why the others are wrong
(a) optics is about light.
(c) mechanics is about motion.
(d) cosmology is about the whole universe.
Remember
Acoustics = sound.
QB4Branches and Interdisciplinary Fields
The behaviour of particles at the atomic and subatomic level is explained by:
Answer(b) quantum mechanics
Step by step
Everyday objects: classical mechanics.
Atoms and smaller: quantum mechanics.
Why the others are wrong
(a) classical mechanics fails at the atomic scale.
(c) thermodynamics is about heat.
(d) astronomy is about celestial bodies.
Remember
Tiny particles = quantum.
QB5Branches and Interdisciplinary Fields
The branch that explores the large-scale structure and evolution of the universe is:
Answer(c) cosmology
Step by step
Whole universe and its evolution: cosmology.
Why the others are wrong
(a) astronomy studies celestial bodies.
(b) geophysics studies the Earth.
(d) solid state physics studies solids.
Remember
Cosmos = universe.
QB6Branches and Interdisciplinary Fields
X-rays, ultrasound, MRI and CT scans belong to the interdisciplinary field of:
Answer(b) medical physics
Step by step
Physics used in hospitals for diagnosis and treatment: medical physics.
Why the others are wrong
(a) biophysics studies biological systems (cells, tissues) with physics.
(c) geophysics studies the Earth.
(d) computational physics uses computers to solve physics problems.
Remember
Hospital physics = medical physics.
QB7Branches and Interdisciplinary Fields
Earthquakes, volcanoes and the Earth's magnetic field are studied in:
Answer(b) geophysics
Step by step
Geo = Earth.
Why the others are wrong
(a) astrophysics studies stars and space.
(c) climate physics studies the atmosphere and weather.
