Changes Around Us(6th Grade > Chemistry ) Questions and answers for exam Preparation

6th Grade > Chemistry

CHANGES AROUND US MCQs

Total Questions : 97 | Page 5 of 10 pages

Question 41. A few activities of Sooraj on a particular morning are mentioned below.
1. To walk through a waterlogged, Sooraj reduced the length of his pants by folding it.
2. In school, he ate an apple during his snacks break.
Classify the above activities as reversible and irreversible.

Reversible change - 1; Irreversible change - 2
Reversible change - 2; Irreversible change - 1
Reversible change - 1,2; Irreversible change - none
Reversible change - none; Irreversible change - 1,2

Discuss Question

Answer: Option A. -> Reversible change - 1; Irreversible change - 2
:
A
Change 1 is areversible change because Sooraj can unfold his pants.
Change 2is an irreversible change because Sooraj cannot get back the original apple once he eats it.

Question 42. Rumi had doubts in his mind that, "Are changes helpful in life?”. To answer his question, the teacher asked him to do an activity. He asked the student to classify following changes into helpful and non-helpful from their perspective.
1.Farmers harvesting crop
2.Ripening of Fruits
3.Rancidity of food

Helpful change - 1, 3; Non-helpful change - 2
Helpful change - 1, 2; Non-helpful change - 3
Helpful change - 1; Non-helpful change - 2, 3
Helpful change - 3; Non-helpful change - 1,2

Discuss Question

Answer: Option B. -> Helpful change - 1, 2; Non-helpful change - 3
:
B
1.The farmers harvesting crop is helpful as the crops after processing give us grains, which are essential for nutrition and survival.
2.Ripening of fruits is helpful change as fruits become sweeter after they ripeand so becometastier.
3.Rancidity of food is non-helpful as food gets stale and not suitable for consumption.
Hence, all changes are not helpful.

Question 43. Classify the following as slow or fast changes: [5 MARKS]

\begin{matrix} S.No & Changes 1 & Growth of a plant 2 & Formation of a cloud 3 & Formation of sugar solution 4 & Inflation of Tyre 5 & Melting of chocolate \end{matrix}

Discuss Question

:
Classifications: 1 Mark each

\begin{matrix} S.No & Changes & Type of Change 1 & Growth of a plant & Slow 2 & Formation of a cloud & Slow 3 & Formation of sugar solution & Fast 4 & Inflation of Tyre & Fast 5 & Melting of chocolate & Fast \end{matrix}

Question 44. Mention any three changes that take place in our body. [3 MARKS]

Discuss Question

:
Changes: 1 Mark each
Any three:
1. There is an increase in our height.
2. Our nails grow.
3. There is increase or decrease in our weight.
4. Our hair grows.

Question 45. Is deforestation a reversible change? Why or why not? [1 MARK]

Discuss Question

:
Deforestation is not areversible change.
Deforestation is considered an irreversible change because once the trees are cut, the same tree cannot be planted.

Question 46. What is the change of a substance from solid to liquid called? [1 MARK]

Discuss Question

:
The change of a substance from solid to liquid is called melting.

Question 47. Classify these changes into reversible and irreversible. [5 MARKS]

\begin{matrix} S.No & Changes 1 & Dissolving salt in water 2 & Melting ice cubes 3 & Release of steam from pressure cooker 4 & Ripening of fruits 5 & Freezing orange juice by cooling \end{matrix}

Discuss Question

:
Classifications: 1 Mark each

\begin{matrix} S.No & Changes & Type of change 1 & Dissolving salt in water & Reversible 2 & Melting ice cubes & Reversible 3 & Release of steam from pressure cooker & Irreversible 4 & Ripening of fruits & Irreversible 5 & Freezing orange juice by cooling & Reversible \end{matrix}

Question 48. Formation of clouds is a physical change. Justify. [2 MARKS]

Discuss Question

:
Justification: 2 Marks
The formation of clouds is a physical change because there is a phase transformation cycle of natural water from liquid to gas and then, gas to liquid. Hence, the property of water never changes.

Question 49.

The leaves of a tree change their colour in spring before the shed. This is a reversible change.

True
False

Discuss Question

Answer: Option B. -> False
:
B

During autumn, leaves change their color so this is a change.
The natural colours of the leaves cannot be regained. Hence, it is an irreversible change.

Question 50.

A few activities of Sooraj on a particular morning are mentioned below.
1. To walk through a waterlogged, Sooraj reduced the length of his pants by folding it.
2. In school, he ate an apple during his snacks break.
Classify the above activities as reversible and irreversible.

Reversible change - 1; Irreversible change - 2
Reversible change - 2; Irreversible change - 1
Reversible change - 1,2; Irreversible change - none
Reversible change - none; Irreversible change - 1,2

Discuss Question

Answer: Option A. -> Reversible change - 1; Irreversible change - 2
:
A

Change 1 is a reversible change because Sooraj can unfold his pants.
Change 2 is an irreversible change because Sooraj cannot get back the original apple once he eats it.