Temporary or Permanent Changes

Q.

Give 2 examples of Reversible and Irreversible changes.

Q.

Is blowing of a balloon reversible or irreversible change? /How?

Q. Give an example in the given case:
(a) Change which occurs on heating but can be reversed.
(b) Change that occurs on heating but cannot be reversed.
(c) Change occurs on cooling but can be reversed.
(d) Change occurs on mixing two substances but can be reversed.
(e) Change which occurs on mixing two substances, but cannot be reversed.

Q. Which among the following is an example of a permanent change?

1. Boiling of water
2. Making paper planes
3. Cutting of trees
4. Melting of ice

Q.

A drawing sheet changes when you draw a picture on it. Can you reverse this change?

Q.

Melting of ice-cream is a

1. Both reversible and irreversible.

2. No change is happening

3. Reversible change.

4. Irreversible change

Q.

The change that is shown in the given below image is ______ in nature.

1. irreversible
2. reversible
3. periodic
4. natural

Q. Hardening of cement is a permanent change.

1. True
2. False

Q.

6. Is folding a reversible change?

Q. __________ are the changes that can be undone.

1. Reversible changes
2. Chemical changes
3. Irreversible changes
4. Fast changes

Q.

The following figure shows ___ change.

Q.

Question 20

It was Paheli's birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli's home:
(a) Simba blew balloons and put them on the wall.
(b) Some of the balloons got burst.
(c) Paheli cut colourful strips of paper and put them on the wall with the help of tape.
(d) She also made some flowers by origami (paper folding) to decorate the house.
(e) Her father made dough balls.
(f) Mother rolled the dough balls to make puries.
(g) Mother heated oil in a pan.
(h) Father fried the puries in hot oil.
Identify the activities at Paheli's home, as those that can be reversed and those, which cannot be reversed.

Q.

2. State whether this change can be reversed or not.

(b) Folding a paper to make a toy aeroplane.

Q. Which of the following is a temporary change?

1. Cutting paper
2. Burning wood
3. Cooking chappati
4. Folding paper

Q. A few activities of steve on a particular morning are mentioned below.
1. Reducing the length of his pants by folding them to walk through a waterlogged street.
2. Eating an apple during the lunch break in school
Classify the above activities as temporary and permanent.

1. 1 - Temporary
   2 - Temporary
2. 1 - Permanent
   2 - Permanent
3. 1 - Permanent
   2 - Temporary
4. 1 - Temporary
   2 - Permanent

Q. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed? ​

Q. Aristotle showed his class a video: "A day in a village”. The video revolves around a primary school going teen named Swami. It showed his general day to day activities. Following are the excerpts from the video.
1. To walk through a waterlogged area, Swami shortens the length of his dress by folding it.
2. In school, he drew an apple on his slate with chalk.
3. After school, he directly came back to his home and started playing with his new toy, but it broke accidentally.
4. At night, his mother cooked food for him. He ate and then retires to bed.
Connect the above excerpts to reversible or irreversible change. (NA denote not any)

1. Reversible change - 1, 2; Irreversible change - 3, 4

2. Reversible change - 1, 2, 3, 4; Irreversible change - NA

3. Reversible change - 3, 4; Irreversible change - 1, 2

4. Reversible change - NA; Irreversible change - 1, 2, 3, 4

Q. Which of the following is a temporary change?

1. Cutting paper
2. Cooking chappati
3. Folding paper
4. Burning wood

Q.

Rolling of chapati and baking of chapati are the changes that-

1. 
   

   can be reversed

2. 
   

   cannot be reversed

3. 
   

   can be reversed and cannot be reversed, respectively

4. 
   

   can not be reversed and cannot be reversed, respectively

Q.

Which of the following statement is incorrect?

Statement 1: Changes are the differences in the state of affairs.

Statement 2: Change can be grouped into reversible and irreversible change.

Statement 3: Change that can't be undone is reversible change and change that can be undone is irreversible change.

Statement 4: There are many ways in which change can be brought.

1. Statement 2

2. Statement 3

3. Statement 1

4. All the statements

Q. Which of the following changes cannot be reversed?

1. Flower to fruit
2. Sheet of paper to paper boat
3. Making of yogurt from milk
4. Dissolving sand in water

Q. Harry went to a bakery and found out that the bread is made from wheat. What type of changes is involved in making of bread?

1. Permanent
2. Temporary
3. Natural
4. Man-made

Q. A sheet of paper is used to make a paper boat. Identify the changes involved in this.

1. Natural
2. Man-made
3. Temporary
4. Permanent

Q.

The following image shows ___ change.

Q. Which of the following change can be reversed?

1. Breaking of a glass tumbler
2. Stretching of a rubber band
3. Cooking of food
4. Chopping of onions

Q. Which of the following is an example of a permanent change?

1. Freezing of water
2. Boiling of an egg
3. Melting of ice cream
4. Melting of wax

Q. Harry went to a bakery and found out that the bread is made from wheat. What type of changes is involved in making of bread?

1. Permanent
2. Temporary
3. Natural
4. Man-made

Q. Germination of seeds is a/an ______________.

1. reversible and fast change
2. irreversible and slow change
3. reversible and slow change
4. irreversible and fast change

Q. True or False
It is must to pack cement in airtight bags.

1. True
2. False

Q. Which of the following is a reversible change?

1. Folding paper
2. Burning wood
3. Cutting paper
4. Cooking chapatis