While sprinkling water on a constructed wall, a bag of cement got wet. Next day it was kept outside in the sunlight. Can the change in cement be reversed? Why?

Important Questions on How Things Change

HARD

6th CBSE

IMPORTANT

Start Up Science 6>Chapter 6 - How Things Change>EXERCISES>Q B

Give two examples from daily life experiences where expansion and contraction of metal are utilized.

EASY

6th CBSE

IMPORTANT

Start Up Science 6>Chapter 6 - How Things Change>EXERCISES>Q B

Suppose it rained heavily in your area today. To go to school, you remove your shoes and hold them in your hands and fold your dress. Are these changes reversible?

HARD

6th CBSE

IMPORTANT

Start Up Science 6>Chapter 6 - How Things Change>EXERCISES>Q B

Doctors apply a thick coat of plaster of Paris (POP) over the bandage on a fractured bone. POP becomes hard on drying and keeps the fractured bone immobilised. Is it a reversible change?

MEDIUM

6th CBSE

IMPORTANT

Start Up Science 6>Chapter 6 - How Things Change>EXERCISES>Q B

Classify the following as reversible or irreversible changes.
(a) Sharpening of pencil   (b) Evaporation of water   (c) Curdling of milk
(d) Freezing of water   (e) Rusting of iron   (f) Blowing a balloon
(g) Opening of a bud   (h) Dropping and breaking of a plastic toy

EASY

6th CBSE

IMPORTANT

Start Up Science 6>Chapter 6 - How Things Change>EXERCISES>Q C

Converting milk into paneer is a reversible change.

EASY

6th CBSE

IMPORTANT

Start Up Science 6>Chapter 6 - How Things Change>EXERCISES>Q C

Burning of coal is an irreversible change.

EASY

6th CBSE