The Ever-Evolving World of Science – MCQs with Answers and Explanations

Q1. The "scope of science" mainly refers to:

1. Only what happens in laboratories
2. All areas where scientific ideas are applied
3. Only space research and astronomy
4. Only inventions of machines

Q2. Science can best be described as:

1. A collection of rigid beliefs
2. A way of asking questions and finding answers
3. Only memorising facts
4. Only doing difficult mathematics

Q3. Which of the following is not a correct statement about science?

1. Science helps us understand natural phenomena.
2. Science is used only by scientists.
3. Science influences our daily life.
4. Science grows when new evidence is found.

Q4. Which activity shows that science is linked to our everyday life?

1. Reading only story books
2. Using an umbrella in the rain
3. Believing in superstitions
4. Ignoring health advice

Q5. The main aim of learning science in school is to:

1. Memorise long definitions
2. Develop curiosity and logical thinking
3. Score marks only in exams
4. Avoid asking questions

Q6. The first step in scientific inquiry usually begins with:

1. Performing a big experiment
2. Writing a long report
3. Careful observation and asking a question
4. Directly making a conclusion

Q7. A "hypothesis" in science is:

1. A final law
2. A guess that is never tested
3. A testable idea or possible explanation
4. A random opinion

Q8. During an experiment, keeping all conditions same except one helps to:

1. Make the test unfair
2. Confuse the results
3. Know which factor actually caused the change
4. Stop the experiment in the middle

Q9. Which of the following shows good observation skill?

1. Ignoring small changes
2. Noting details like colour, size and time carefully
3. Guessing without looking
4. Copying others’ answers

Q10. After an experiment, a scientist writes a "conclusion". This should be based on:

1. Personal liking
2. What friends say
3. Results and evidence from the experiment
4. Random guessing

Q11. Which of these daily activities uses science and technology directly?

1. Walking barefoot only
2. Using a smartphone to call a friend
3. Closing eyes in sunlight
4. Sitting idle all day

Q12. Using LPG in the kitchen instead of firewood is an example of science helping to:

1. Increase smoke in the kitchen
2. Reduce heat production
3. Cook faster and reduce air pollution
4. Stop cooking completely

Q13. Brushing teeth with fluoride toothpaste is related to science because:

1. It tastes good
2. Fluoride helps protect teeth from decay
3. It changes tooth colour for fun
4. It works only at night

Q14. Which device uses scientific principles of electricity and magnetism?

1. Wooden chair
2. Electric fan
3. Clay pot
4. Paper bag

Q15. Science helps in healthcare mainly by:

1. Spreading rumours
2. Giving untested medicines
3. Developing vaccines, medicines and medical tools
4. Stopping all treatment

Q16. Using solar energy helps the environment because it:

1. Increases air pollution
2. Comes from a non-renewable source
3. Is clean and renewable
4. Produces only smoke and ash

Q17. Plastic is harmful to the environment mainly because it:

1. Decomposes very quickly
2. Does not decompose easily
3. Is always eaten by plants
4. Turns into fresh soil in days

Q18. Science can help society by:

1. Creating only luxuries
2. Solving problems like disease, energy shortage and pollution
3. Stopping people from thinking
4. Supporting wrong beliefs

Q19. Planting more trees is supported by science because trees:

1. Add dust to air
2. Reduce oxygen in air
3. Absorb carbon dioxide and release oxygen
4. Stop rain forever

Q20. Scientific awareness in society helps people to:

1. Follow only superstitions
2. Make informed and logical decisions
3. Ignore health rules
4. Always reject vaccines

Q21. Which action is correct lab safety practice?

1. Running in the lab
2. Eating during experiments
3. Wearing safety goggles while heating chemicals
4. Pointing test tubes at friends

Q22. Holding a test tube over a flame should be done:

1. With bare hands
2. Pointing towards others
3. With a test tube holder and mouth away from people
4. Placed directly on the table

Q23. Ethics in science mainly means:

1. Hiding results
2. Being honest and working for the good of people
3. Copying others’ work
4. Cheating in experiments

Q24. In a "fair test", the students must:

1. Change many conditions at once
2. Keep all conditions same except the one being tested
3. Stop recording results
4. Ignore unusual observations

Q25. Why should we not taste chemicals in the lab?

1. They may be too sweet
2. They are always salty
3. They can be poisonous and harmful
4. They do not have any effect

Q26. Which of the following careers is directly related to science?

1. Doctor
2. Singer
3. Dancer
4. Painter

Q27. A meteorologist mainly studies:

1. Rocks under the ground
2. Weather and atmosphere
3. Only stars and galaxies
4. Only ancient fossils

Q28. Which quality is important for becoming a good scientist?

1. Being lazy
2. Being curious and hard-working
3. Hating questions
4. Never accepting new ideas

Q29. Learning about famous scientists helps students to:

1. Feel discouraged
2. Copy their lives exactly
3. Get inspired and learn good scientific values
4. Avoid science forever

Q30. An engineer uses science mainly to:

1. Write poems
2. Build structures and machines
3. Sing songs
4. Paint pictures

Q31. A scientific attitude mainly includes:

1. Accepting everything without proof
2. Being curious and seeking evidence
3. Believing only rumours
4. Ignoring facts

Q32. Superstition is:

1. A belief based on scientific proof
2. A belief without scientific evidence
3. A proven law of nature
4. The result of careful experiment

Q33. When someone says a medicine can cure all diseases, we should:

1. Believe it immediately
2. Spread the message quickly
3. Check if it is tested and approved by doctors
4. Stop using all other medicines

Q34. Logical thinking in science means:

1. Jumping to results without data
2. Using reasons and evidence to reach conclusions
3. Copying others
4. Ignoring observations

Q35. Which action shows scientific attitude in daily life?

1. Refusing vaccines due to rumours
2. Checking facts from reliable sources
3. Sharing unverified messages
4. Believing everything on social media

Q36. Which of these is a benefit of modern technology?

1. Instant communication across the world
2. Complete isolation
3. Stopping all learning
4. Ending all social contact

Q37. Excessive use of screens can cause:

1. Better eyesight
2. Eye strain and less physical activity
3. Stronger bones
4. Improved sleep always

Q38. Machines in factories are helpful because they:

1. Always waste time
2. Make products faster and in large quantity
3. Stop production
4. Work without energy

Q39. One limitation of technology is that it can:

1. Never be misused
2. Automatically solve every problem
3. Reduce some types of jobs and cause overdependence
4. Work without electricity always

Q40. Balanced use of technology means:

1. Using gadgets all the time
2. Never using any gadgets
3. Using technology for useful work and limiting misuse
4. Throwing away all devices

Q41. Scientific ideas change over time mainly because:

1. Scientists become bored
2. New evidence and better tools appear
3. Books must be rewritten
4. Students demand changes

Q42. Earlier people believed that the Earth was at the centre of the universe. This is an example of:

1. Correct modern idea
2. Observation without mistake
3. An old scientific model later replaced
4. Superstition

Q43. Reclassifying Pluto as a dwarf planet shows that:

1. Science never changes
2. New definitions and discoveries can update knowledge
3. Planets can disappear
4. Scientists never agree

Q44. Which statement about science is true?

1. Science is fixed forever.
2. Science throws away all old ideas without checking.
3. Science builds on old ideas and improves them when needed.
4. Science never uses experiments.

Q45. Calling our world an "ever-evolving world of science" means:

1. Science has stopped growing
2. Science grows and changes with new discoveries
3. Science is only about the past
4. Science is only about magic

Q46. Satellites and weather radars help us in the future by:

1. Hiding storms
2. Predicting weather and natural disasters
3. Stopping rainfall
4. Creating cyclones

Q47. In the future, science will be most important for:

1. Increasing pollution
2. Solving problems like clean water, energy and disease
3. Creating only toys
4. Stopping education

Q48. Students who learn science today can help the world tomorrow by:

1. Ignoring problems
2. Using their knowledge to find solutions
3. Believing only in luck
4. Never asking questions

Q49. Which project idea shows science being used for a better tomorrow?

1. Making only loud crackers
2. Designing a simple water filter model
3. Wasting electricity
4. Throwing garbage on streets

Q50. Why should Class 7 students develop interest in science?

1. To increase fear
2. Only to memorise facts
3. To understand the world and become problem-solvers
4. To avoid thinking