CBSE Class 10 Sample Paper Science Solution - For 2023 Boards

Class 10
Solutions to CBSE Sample Paper - Science Class 10

Two students decided to investigate the effect of water and air on iron object under identical experimental conditions. They measured the mass of each object before placing it partially immersed in 10 ml of water. After a few days, the object were removed, dried and their masses were measured. The table shows their results.

Student Object

Mass of Object before

Rusting in g

Mass of the coated

object in g
A Nail 3.0 3.15
B Thin plate 6.0 6.33

(a) What might be the reason for the varied observations of the two students?




  • Rusting occurs in both A and B so there is an increase in mass due to the formation of rust .
  • As the surface area of B is more , more of B is exposed to air and water.
  • Hence, the extent of rusting in B is more.



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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo