Question

Activity:- Write 5-5 examples o
- 1) Man-made change
2) Natural change
3) Useful change
4) Harmful change
5) Fast/ quick change
6) Slow change
7) Reversible change
8) Irreversible change
9) Periodic change
10) Non periodic change​

Answer 1

Explanation:

1) Burning of fuel,

Cutting of hair,

Switching on lights

2) Spoiling of food,

ripening of fruits,

earthquakes,

growth in man,

erupting volcanoes,

rusting of iron

Answer 2

Answer:

Man-made change - eg. Changing the direction of flow of a river by dams, Burning of fuels, cutting hair, switching on lights

Natural change - eg. Changing of seasons, tides in the sea, aging of plants

Useful change - eg. The formation of curd from milk, the decay of cow dung, leaves to form manure

Harmful change - eg. Milk turning sour, food getting spoilt, rusting of iron, breaking of a window pane, forest fire

Fast change - eg. Occurrence of lightning during thunderstorm, Burning of paper, stretching of a rubber band, blowing of balloons, bursting of crackers .

Slow change - eg. Growth of a plant, Rusting of iron, ripening of fruits, growing of trees .

Reversible change - eg. Melting of ice, melting of wax, stretching of a rubber band, Folding, ironing of a cloth.

Irreversible change - eg. Burning of paper, growth of plants, Printing, Falling of rain, Breaking of a glass rod.

Periodic change - eg. Swinging of pendulum ,Swinging of a clock pendulum, Phases of moon, Change of seasons,

Beating of heart .

Non-periodic change - eg. Occurrence of floods, Earthquakes, Landslides during rainy season, Falling of leaves from a tree, Rusting of iron articles, Sneezing, coughing