Tag: physical changes

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Questions Related to physical changes

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

Which of the following is not a physical change?

  1. Tearing a paper

  2. Bending an iron rod

  3. Freezing water into ice

  4. Curdling of milk
Reveal answer Fill a bubble to check yourself
D Correct answer
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

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

Which one of the following is a reversible change?

  1. cutting wood in pieces

  2. blooming of flowers

  3. melting of ice

  4. the burning of a candle
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. chemical properties

  2. physical properties

  3. chemical changes

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following is a physical change?

  1. Rusting of Iron.

  2. The burning of coal

  3. Cooking food

  4. Converting ice in the water
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. chemical change

  2. physical change

  3. neutralisation

  4. galvanisation
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following is correctly matched?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Making an ice cube is a phase change from liquid to solid, which is a classic example of a physical change. The other options are incorrectly classified (e.g., folding paper is physical, breaking glass is physical).

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

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?

  1. Only i

  2. Only ii

  3. Both i and ii

  4. Neither i nor ii
Reveal answer Fill a bubble to check yourself
B Correct answer
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.