CBSE Class 7 Science The Ever-Evolving World of Science (Class 7 NCERT New) Quiz 3

1. Which observation of a solution suggests a chemical change occurred?

A Volume measured is constant B Temperature rises without heating C Color remains unchanged D Beaker mass stays identical

2. What is the most accurate way to read a liquid meniscus?

A Top of curve at chest height B Top of curve from below C Bottom of curve at eye level D Bottom of curve from above

3. If sunlight is behind you and raindrops are ahead, what are you most likely to see?

A Lightning without thunder B A rainbow opposite the Sun C A halo around the Sun D Dense fog surrounding you

4. Why is repeatability important in measurements?

A It guarantees ultimate truth B It shows results are consistent C It simplifies unit conversion D It avoids all human errors

5. Which task requires both classification and measurement?

A Memorizing planet names B Drawing a meteor shower sketch C Grouping rocks by density ranges D Writing a story about rain

6. A lab note reads: “Bubbles formed; temperature increased; vinegar smell.” What kind of data is this?

A Quantitative only data B Qualitative descriptive data C Mathematical modeling data D Irrelevant anecdotal data

7. A classification key separates plants by leaf shape, then by edge pattern. What is this tool called?

A Periodic change schedule B Measurement conversion chart C Dichotomous identification key D Randomized catalog list

8. When organizing lab glassware, which classification is most practical?

A By function such as measuring B By favorite brand names C By color preferences only D By random shelf location

9. What does strategic use of evidence mean when explaining a rainbow to a friend?

A Use unrelated lab stories B Use weather jokes and myths C Use personal opinion only D Use prism results and photos

10. Which data set shows both qualitative and quantitative observations?

A Smooth texture; rough edge; soft B 20°C; 15 mL; 5 g C Red flame; sharp odor; bubbles D Green color; 25°C; 3 cm foam