Std.7, General Science ,15. Materials we use

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Which substance were used earlier for cleaning teeth?

1 point

Salt

Tooth powder

Neem twigs

Pomegranate rings

Powder of shells

What are the material used for construction?

1 point

Cement

Soil

Bricks

Limestone

Mud

Write true or false. Many year ago toothpaste was made by mixing the Powder of bones and shells.

1 point

True

False

Name *

What is principle ingredients of toothpaste?

1 point

Calcium carbonate

Calcium hydrogen phosphate

Sodium

What are the ingredients of cement ?

1 point

Silica

Alumina

iron oxide

Magnesia

Fill in the blank. Soap is a salt of. . . . . . . And sodium hydroxide

1 point

White cement

Fatty acid

Detergent

Fill in the blank. Synthetic detergents can be used in . . . . . . Water as well.

1 point

Normal

Soft

Hard

Match the columns.

2 points

Sodium salt

Potassium salt

Hard soap

Soft soap

Clear selection

Write true or false. One effect of surface activity is no leather formation

1 point

True

False

Clear selection

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