CBSE Class 7 Science The Ever-Evolving World of Science (Class 7 NCERT New) Quiz 2

1. Which is the best definition of scientific observation?

A A rule explaining natural behavior B Careful noting of details using senses C A final explanation for results D Guessing outcomes for an experiment

2. Which step should you take before classifying objects?

A Choose random group names B Ignore minor differences seen C Gather clear observations first D Skip measurement and estimate

3. You want to classify stars by brightness. Which measurement would be most useful?

A Temperature in Celsius only B Apparent magnitude scale C Length in centimeters D Mass in grams nearby

4. When observing, why is it helpful to use more than one sense when safe?

A It removes need for tools B It replaces any measurements C It provides richer, accurate details D It always speeds up the task

5. You measure the same beaker three times and get 98, 100, 99 mL. What does this show?

A No relation to measurement B High accuracy with wrong units C Low precision with random data D High precision with consistency

6. Which criterion would be most consistent for classifying leaves?

A Estimated average smell B Observed vein patterns only C Favorite color preferences D Randomly assigned numbers

7. Which choice lists only standard SI base or derived units useful in class?

A Foot, gallon, pound B Meter, liter, gram C Inch, pint, ounce D Yard, quart, stone

8. A prism produces a spectrum on paper. What is the best conclusion?

A White light contains many colors B Colors are unrelated to light C Rainbows are purely illusions D Light cannot be refracted

9. To compare rainfall between cities, what practice is essential?

A Change methods each month B Use different units for each C Use the same units and tools D Ignore measurement timing

10. Which method best reduces bias when classifying living things?

A Follow the loudest opinion B Choose categories by size only C Rely on memory of stories D Use clear observable criteria