Changes Around Us Objective Type Questions & Answers

Hi Everyone!! This article will share Changes Around Us Objective Type Questions & Answers.

In my previous posts, I have shared the Objective Type Questions & Answers of Light Shadows and Reflection, Sources Of Food and Components Of Food so, you can check these posts as well.

Changes Around Us Objective Type Questions & Answers

Question 1: Fill in the blanks:

(a) The changes which cannot be reversed simply by changing the conditions are called irreversible changes.
(b) When we heat water, it changes its state from liquid to gas.
(c) During photosynthesis, plants use light energy from the sun to make food.
(d) Changes which occur without human efforts are called natural changes.
(e) Rusting is a chemical change.
(f) Changes that take long time to occur are called slow changes.

Question 2: Write true or false:

(a) Application of heat can bring about both physical and chemical changes – True
(b) All physical changes are reversible in nature – False
(c) Reversible physical changes are the changes in which the original form of the substance cannot be restored – False
(d) Boiling of a potato is a chemical change – False
(e) Growth of a plant from a seed is a slow change – True

Changes Around Us Objective Type Questions & Answers

Question 3: Choose the correct option.

(a) Which of the following is not an example of an irreversible physical change?

i. Crushing of wood into sawdust
ii. Cutting of grass
iii. Heating an iron rod
iv. Grinding of wheat into flour

(b) Which of the following process is not an example of a physical change?

i. Burning
ii. Melting
iii. Condensation
iv. Boiling

(c) In which of the following examples, a physical and a chemical change is occurring simultaneously?

i. Rusting of iron
ii. Burning of candle
iii. Dissolving salt in water
iv. Adding baking soda to vinegar

(d) Which of the following is an example of chemical change?

i. Boiling of water
ii. Heating of sugar solution
iii. Heating of iron rod
iv. Heating of sugar

(e) Which of the following is true about a chemical change?

i. All chemical changes are reversible.
ii. All chemical changes release chemical energy.
iii. All chemical changes are slow in nature.
iv. All chemical changes result in the formation of a new substance.

(f) When salt is dissolved in water it is a (an)……………….

i. Irreversible change
ii. Chemical change
iii. Physical change
iv. Both i and ii

Question 4: In the following questions, two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Read the statements carefully and choose the correct alternative (A), (B), (C) and (D) as given below.
(A) Both A and R are true and R is correct explanation of the assertion.
(B) Both A and R are true but R is not the correct explanation of the assertion.
(C) A is true but R is false.
(D) A is false but R is true.

(a) Assertion: Rotting of food is an example of an undesirable change.
Reason: Changes that are useful to us are known as undesirable changes.

Answer: (C)

(b) Assertion: Adding baking soda to vinegar results in a chemical change with the evolution of carbon dioxide gas.
Reason: When two or more substances are mixed they may react with each other to form a new substance.

Answer: (A)

So, these were Changes Around Us Objective Type Questions & Answers.

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