Class 9 Science Chapter 1: Exploration: Entering the World of Secondary Science — practice questions with answers
Free practice for Class 9 Science, Chapter 1: Exploration: Entering the World of Secondary Science. Try the solved questions below, then take a free test with instant marking and explanations.
48 questions18 easy, 24 medium, 6 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. In science, what is a model?
- A simplified way of representing a real system that keeps only what matters for a given question
- An exact copy of every detail
- A toy for display
- A guess with no evidence
Show answer
Answer: A. A simplified way of representing a real system that keeps only what matters for a given question
Why: e.g. a moving car as a single point. [p.2]
Why: e.g. a moving car as a single point. [p.2]
Q2. To model whether a cricket ball hit for six will clear the boundary, which detail matters most?
- The speed and direction of the hit
- The brand of the bat
- The colour of the ball
- The amount of grass
Show answer
Answer: A. The speed and direction of the hit
Why: Mass, speed and direction are key; colour and brand are not. [p.2]
Why: Mass, speed and direction are key; colour and brand are not. [p.2]
Q3. You want to model the time to cycle from school to home. Which detail is most important?
- Distance and average speed
- Colour of the bicycle
- Brand of your shoes
- The name of your street
Show answer
Answer: A. Distance and average speed
Why: Keep what affects time; ignore what doesn’t. [p.2]
Why: Keep what affects time; ignore what doesn’t. [p.2]
Q4. Why do words like ‘force’, ‘work’ and ‘cell’ have very specific meanings in science?
- So ideas can be communicated clearly and without confusion
- To make science harder
- Because everyday meanings are wrong
- They have no special meaning
Show answer
Answer: A. So ideas can be communicated clearly and without confusion
Why: Scientists share terms, symbols and units. [p.2]
Why: Scientists share terms, symbols and units. [p.2]
Q5. A passenger plane ran out of fuel because the ground crew mixed up pounds and kilograms. What lesson does this teach?
- Using standard (SI) units everywhere avoids conversion errors
- Planes should carry no fuel
- Pounds are better than kilograms
- Units do not matter
Show answer
Answer: A. Using standard (SI) units everywhere avoids conversion errors
Why: The plane was about 15,000 litres short. [p.3]
Why: The plane was about 15,000 litres short. [p.3]
Q6. Why do we expect a kilogram of rice to mean the same amount everywhere?
- Measurements are based on agreed international standards
- Every shop uses its own stone
- Kilograms change by city
- It is only a guess
Show answer
Answer: A. Measurements are based on agreed international standards
Why: Standard units ensure fairness in trade and science. [p.3]
Why: Standard units ensure fairness in trade and science. [p.3]
Practise all 48 questions free
Timed test, marked instantly, with the correct answer and explanation for every question and a chapter-wise report.
Start the free testUnderstand it by doing
Try the interactive Science Lab for Class 9.
Frequently asked questions
How many practice questions are there for Class 9 Science Chapter 1: Exploration: Entering the World of Secondary Science?
48 questions (18 easy, 24 medium, 6 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 9 Science syllabus, used by CBSE and many state boards.