physical and chemical changes class 7

In which type of change a new substance is formed?

• physical change

• chemical change

• mechanical change

• none of these

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which among the following is a physical change?

• Cutting a log of wood in small pieces

• Burning of wood

• Ripening of fruit

• Cooking of food

Which of the following is a chemical change?

• Bursting of a fire cracker

• Germination of seed

• Coal formation from buried trees

• All of these

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is a method to prevent rust?

• Galvanisation

• painting

• oiling

• all of these

What is the formula of rust?

• Fe₂O₃

• Fe₃O₄

• FeO

• none of these

Tags

NGSS.MS-PS1-1

What will happen if carbon dioxide gas is passed through lime water ?

• Calcium carbonate is formed

• The lime water turns milky

• Both of these

• None of these

Tags

NGSS.MS-PS1-2

Galvanisation is a process used to prevent the rusting of which of the following?

• iron

• zinc

• aluminium

• copper

Changes that lead to the formation of new substances are called …………………. changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A brown layer formed when an iron article is left exposed in an open area is called ………………….

Burning of candle

• physical change

• chemical change

• both physical and chemical change

• none of these

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5