Tag: physical changes

Questions Related to physical changes

Which of the following is not a physical change?

chemistry change around us physical changes changes and their classification physical changes

  1. Tearing a paper

  2. Bending an iron rod

  3. Freezing water into ice

  4. Curdling of milk

Show answer
Correct Option: D
Explanation:

Tearing of paper is a physical change because it remains same. Tearing of a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed.

Cheese is made when an enzyme called rennet is added to milk. The rennet causes a chemical reaction where the milk solids curdle, separating themselves from the whey, or liquid portion of the milk

When a substance has changes in its physical properties than it is known as:

chemistry change around us physical changes changes and their classification physical changes

  1. Structural change

  2. Biological change

  3. Physical change

  4. Chemical change

Show answer
Correct Option: C
Explanation:

Change in only physical properties is known as physical change.

Which one of the following is a reversible change?

chemistry change around us physical changes changes and their classification physical changes

  1. cutting wood in pieces

  2. blooming of flowers

  3. melting of ice

  4. the burning of a candle

Show answer
Correct Option: C
Explanation:

Melting of ice is a physical change in which substance changes its physical state but not properties.


 Hence it is a reversible change in which melted ice can freeze again by decrease in temperature.

Hence the option C is correct.

Properties such as shape, size, colour and state of a substance are called it's:

chemistry change around us physical changes changes and their classification physical changes

  1. chemical properties

  2. physical properties

  3. chemical changes

  4. none of these

Show answer
Correct Option: B
Explanation:

Properties such as shape, size, colour and state of a substance are called its physical properties.A physical change is generally reversible. In such a change no new substance is formed.

Which of the following is a physical change?

chemistry change around us physical changes changes and their classification physical changes

  1. Rusting of Iron.

  2. The burning of coal

  3. Cooking food

  4. Converting ice in the water

Show answer
Correct Option: D
Explanation:

Change in the state between solid, liquid and gas is a physical change because Properties such as shape, size, colour and state of a substance are called its physical properties which are reversible.


Hence the option D is correct.

The process of obtaining salt by the evaporation of sea water is a :

chemistry change around us physical changes changes and their classification physical changes

  1. chemical change

  2. physical change

  3. neutralisation

  4. galvanisation

Show answer
Correct Option: B
Explanation:

The process of obtaining salt by the evaporation of sea water is a process of crystallization which is a reversible process and a physical change, these crystals will convert again in salt solution (seawater) by dissolving them in water.


Hence the correct option is B.

Which of the following is a physical change?

chemistry change around us physical changes changes and their classification physical changes

  1. Photosynthesis

  2. Melting of steel

  3. Burning of wood

  4. Radioactive decay

Show answer
Correct Option: B
Explanation:

Solution:- (B) Melting of steel

Explanation:-
Melting is the physical change, temperature and melting points are physical properties.

Which of the following is correctly matched?

chemistry change around us physical changes changes and their classification physical changes

  1. Making of ice cube - Physical Change.

  2. Folding of a paper - Chemical, Reversible.

  3. Breaking of a glass - Chemical, Irreversible.

  4. All of these

Show answer
Correct Option: A

Cutting of a log of wood is a chemical change.

chemistry change around us physical changes changes and their classification physical changes

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

False

The cutting of wood piece is a physical change. Cutting would give rise to a new wood piece in which no new substance is formed so its a physical change. 

Two changes are stated below:
(i.) A piece of magnesium gives of bright flames when burned.
(ii). A piece of iron glows red when heated strongly.
 Which of these is a physical change?

chemistry change around us physical changes changes and their classification physical changes

  1. Only i

  2. Only ii

  3. Both i and ii

  4. Neither i nor ii

Show answer
Correct Option: B
Explanation:

When magnesium is burnt, it reacts with the heat and gives bright flames and this change cannot be reversed.
When iron heated strongly it turns red. When heating is stopped it cools and get backs to its original form. So this is a physical change.