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The Wonderful World of Science – Class 6 Science notes, important questions and MCQs

NCERT Class 6 Science, chapter 1. Notes, key terms, important questions with answers and MCQs.

Chapter overview

Science is a way of exploring the world by asking questions, observing carefully and testing ideas. Everyone can think like a scientist.

Thinking like a scientist

Be curious: ask "why", "how" and "what if".
Observe with senses and simple tools (hand lens, ruler, thermometer).
Make a guess, test it, and check if the result supports it.

Science around us

Science explains cooking, weather, plants, machines and our body.
Scientists share findings so that others can check them.
Safety first: handle tools carefully and ask an adult for help.

Key terms

Observation: noticing something using the senses or tools
Experiment: a test done to check an idea
Hypothesis: a possible answer to a question that can be tested

Formulas

Question → guess → test → result → conclusion

Important questions with answers

Name two things a scientist does to find answers.2 marks

Observes carefully and does experiments (tests ideas); also records results and discusses them with others.

Why should an experiment be repeated?3 marks

Repeating checks that the result was not due to chance or a mistake. If we get the same result again, we can trust it more.

Plan a simple experiment to find out whether plants need sunlight to stay green. Mention what you change, what you keep the same and what you observe.5 marks

Take two similar potted plants of the same kind. Keep one in sunlight and the other in a dark cupboard (changed factor: sunlight). Give both the same amount of water, the same soil and pot size (kept the same). Observe the leaves daily for a week and record the colour. The plant in the dark turns pale or yellow, showing plants need sunlight to stay green.

Quick revision

Science begins with curiosity.
Experiments test ideas.
Safety first.

Exam tips

Write what you see, not what you expect to see.
Repeat a test to be sure.

Practice MCQs

Science starts with
1. answers
2. rules
3. questions
4. exams
Show answer
Answer: (c) questions. Curiosity.
A hand lens helps us to
1. see small things bigger
2. hear better
3. smell
4. measure weight
Show answer
Answer: (a) see small things bigger. Magnifies.
Which step comes after making a guess?
1. testing the guess
2. asking a question
3. writing the answer first
4. stopping
Show answer
Answer: (a) testing the guess. Test it.
Why should we repeat an experiment?
1. to waste time
2. because it is fun only
3. to change the result
4. to be sure of the result
Show answer
Answer: (d) to be sure of the result. Reliability.
Which step comes right after asking a question in science
1. drawing a conclusion
2. sharing results
3. making a guess (hypothesis)
4. ignoring the question
Show answer
Answer: (c) making a guess (hypothesis). Guess, then test.
A student thinks ice melts faster in sunlight. The best test is to
1. keep both in shade
2. keep one ice cube in sun and one in shade and compare
3. ask a friend
4. read a story
Show answer
Answer: (b) keep one ice cube in sun and one in shade and compare. Fair comparison.
Which is an observation?
1. water always boils at noon
2. the water is boiling with bubbles
3. all liquids are water
4. boiling is magic
Show answer
Answer: (b) the water is boiling with bubbles. Something seen.
Seeds were kept in two pots, one watered and one not. The changed factor is
1. water
2. type of seed
3. pot size
4. soil
Show answer
Answer: (a) water. Only water was changed.

All chapters of Class 6 Science

Written by Kundali IQ from standard, well-established facts to help with revision. This is not an official NCERT publication; always read your textbook too.