MEDIUM
9th Maharashtra Board
IMPORTANT
Earn 100

Write down properties of teflon.

Important Questions on Substances in Common Use

EASY
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 3
What type of colours will you use to celebrate eco friendly Rang Panchami? Why?
EASY
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 3
Why has the use of methods like Teflon coating become more common?
MEDIUM
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 4

Give scientific explanation:

Bleaching powder has the odour of chlorine.

MEDIUM
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 4

Give scientific explanation:

The hard water of a well becomes soft on adding washing soda to it.

MEDIUM
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 4

Give scientific explanation

Soap forms a precipitate in hard water.

MEDIUM
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 4

Give scientific explanation:

The particles of powder are given an electric charge while spraying them to form the powder coating.

MEDIUM
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 4

Give scientific explanation.

The aluminium article is used as an anode in the anodising process.

MEDIUM
9th Maharashtra Board
IMPORTANT
Science and Technology Standard Nine>Chapter 14 - Substances in Common Use>Exercises>Q 4

Give scientific explanation:

When the radiation coming out from certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.