Changes Around Us

Changes Around Us Worksheet-1

1. A change in which the original substance can be obtained back by reversing conditions is called

(a) Reversible change

(b) Physical change

(c) Irreversible change

(d) Both Reversible change & Physical change

2. When a little bit of curd is added to milk and it is left undisturbed for sometimes, the milk is changed into curd. It is an example of

(a) Fast chemical change

(b) Fast physical change

(c) Slow chemical change

(d) Slow physical change

Changes Around Us Worksheet-2

1. When magnesium ribbon is burnt, heat and light are produced. It is an example of

(a) Chemical change

(b) Physical and irreversible change

(c) Chemical and exothermic change

(d) Chemical and endothermic change

2. Reverse of boiling is

(a) Condensation

(b) Evaporation

(c) Vaporization

(d) Freezing