Physical Change

Q. Melting of ice is a change.

1. physical
2. chemical
3. permanent

Q.

Name one physical change which is irreversible

Q.

Dissolution of salt and sugar into water is a reversible process.

1. True

2. False

Q.

Cutting of wooden logs into small pieces is a:-

1. Slow change

2. Physical change

3. Chemical change

4. Natural change

Q.

Conversion of water into water vapour during evaporation is a

1. Chemical change

2. No change

3. Physical change

4. Cannot be determined

Q.

Sharpening of a pencil is a type of:

1. Chemical and reversible change.

2. Physical and reversible change.

3. Physical and irreversible change.

4. Chemical and irreversible change.

Q. Why is germination of a seed a chemical change ?

Q.

Categorize rolling of dough and baking of roti as physical or chemical changes.

Q. Consider the following statements.
Statement 1: Crushing a can is an example of chemical change.
Statement 2: Folding a paper is not a physical change.

1. Both the statements are true.
2. Both the statements are false.
3. Only statement 2 is true.
4. Only statement 1 is true.

Q.

Which of the given below options is true when milk changes into curd?

1. Its state is changed from liquid to semi-solid.
2. Its color changes.
3. Its tastes change.
4. The change cannot be reversed.

Choose the correct option from the following options:

1. (i) and (ii) are correct

2. (ii) and (iii) are correct

3. (i), (iii) and (iv) are correct

4. (i) to (iv) are correct

Q.

Which of the following is/are both physical and reversible changes?

1. Inflating a balloon

2. Pricking an inflated balloon

3. Conversion of paper to a paper boat

4. Tearing paper

Q. Which of the following is not a physical change?

1. Burning of Paper
2. Cutting of paper
3. Twisting of paper
4. Folding of paper

Q.

Physical changes can cause changes in the chemical properties as well.

1. True

2. False

Q.

What type of change is depicted by sharpening a pencil which will reduce its length?

1. Chemical and Reversible Change

2. Physical and Reversible Change

3. Chemical and Irreversible Change

4. Physical and Irreversible Change

Q.

A change envolves energy. Explain giving an example

Q.

Give a reason for the following statement:

A chemical change is a permanent change.

Q.

1.Match the Column I with Column II.

Column 1	Column 2
No new substance is formed.	Irreversible change
Physical change	Reversible change
A new substance is formed.	Sawing of piece of wood
Chemical change	Melting of ice cream
Need heating	Ripening of mango.

Q.

In summers we have observed that it becomes difficult to close and open an iron door. Which of the given conclusion is incorrect?

1. The change occurring, in this case, is reversible.

2. The shape of the iron door changes and the change is irreversible.

3. The iron door expands.

4. The iron door comes to the same size upon cooling.

Q.

Define the following terms :

Sediment

Q. What are the effects of global warming on water cycle?

Q. 1)What happen when things are heated beyond certain limit
2) why does the milk in saucepan overflow when heated over gas

Q.
Observe the image above and conclude which among the following kind of a change is clay undergoing when it is moulded into a caterpillar?

1. Chemical change

2. Natural change

3. Physical change

4. Permanent change

Q.

Adding salt to water, to make a salt solution, is a ___ process.

1. cannot say

2. reversible

3. irreversible

4. slow

Q.

Are the following natural changes? Justify your answer.

Cooking food

Q. Mercury, a metal filled inside a thermometer rise and fall as per the change in our body temperature. This change is an example of _____ change.

1. an irreversible physical
2. an irreversible chemical
3. a reversible physical
4. a reversible chemical

Q.

Statement I: Melting is a physical change as the melted wax can again be obtained as solid wax upon cooling
Statement II: Burning of wax is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form.

Which of the following option is correct?

1. Statement I:- False

   Statement II:- False

2. Statement I:- True

   Statement II:- False

3. Statement I:- True

   Statement II:- True

4. Statement I:- False

   Statement II:- True

Q. The process through which a substance changes from a liquid to a solid is called ____________ .

1. melting
2. boiling
3. condensation
4. freezing

Q. Explain why tearing of paper is physical change whereas burning of paper is a chemical change?

Q.

On continuous application of heat, an iron rod is converted from the solid into the liquid state. This phase transition is called ___.

1. Melting

2. None of the above

3. Evaporation

4. Condensation

Q.

Categorize rolling of dough and baking of roti as physical or chemical changes.