EASY
7th Andhra Pradesh Board
IMPORTANT
Earn 100

Make a list of some physical changes you observe in your daily life.

Important Questions on Changes Around Us

EASY
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE

Record the observations in the table given below. What changes do you notice?

Name of the material Changes observed when burnt
A piece of wood      
A piece of paper      
A piece of cotton      

 

EASY
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Are the materials present before and after burning the wood, paper and cotton, the same?
EASY
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Can you name some changes which form new substances?
EASY
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Have you ever observed iron nails, iron gates, iron benches or pieces of iron left in the open ground for a long time? What did you notice?
EASY
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE

Why do iron articles get rust when they are exposed to air for a long time?

MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Apart from painting or greasing what are the other ways of preventing iron from rusting?
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
Do all metals react with oxygen in the air?
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 17 - Changes Around Us>EXERCISE
List the metals which corrode and which do not corrode when exposed to air.