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All questions of Changes Around Us for Class 6 Exam
Which process in nature involves extremely slow changes that can take millions of years to occur?- a)Formation of clouds
- b)Evolution of stars
- c)Formation of coal from wood
- d)Melting of ice caps
Correct answer is option 'C'. Can you explain this answer?
a)
Formation of clouds
b)
Evolution of stars
c)
Formation of coal from wood
d)
Melting of ice caps
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Vp Classes answered |
The formation of coal from wood is a natural process that involves extremely slow changes taking millions of years to complete. This transformation occurs through the gradual compression and decomposition of plant material over extended periods, eventually resulting in the formation of coal, a process that exemplifies the concept of slow changes in nature.
Which type of energy is typically released when wood undergoes combustion?- a)Sound energy
- b)Potential energy
- c)Mechanical energy
- d)Heat and light energy
Correct answer is option 'D'. Can you explain this answer?
a)
Sound energy
b)
Potential energy
c)
Mechanical energy
d)
Heat and light energy
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Eduskill Classes answered |
When wood undergoes combustion, it releases heat and light energy. This process involves the chemical reaction of wood with oxygen in the air, resulting in the conversion of chemical energy stored in the wood into thermal energy (heat) and radiant energy (light).
In a chemical change, what generally happens to the substances involved?- a)They retain their original properties.
- b)They transform into new substances with different properties.
- c)They evaporate into the surrounding environment.
- d)They undergo a physical change.
Correct answer is option 'B'. Can you explain this answer?
a)
They retain their original properties.
b)
They transform into new substances with different properties.
c)
They evaporate into the surrounding environment.
d)
They undergo a physical change.
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Dr Manju Sen answered |
In a chemical change, substances typically transform into new substances with different properties. This process involves the breaking and forming of chemical bonds, resulting in the creation of entirely new compounds with distinct characteristics.
What is a key characteristic of most chemical changes?- a)They are reversible processes.
- b)They involve only physical transformations.
- c)New substances are formed with different properties.
- d)Energy is never involved in chemical changes.
Correct answer is option 'C'. Can you explain this answer?
a)
They are reversible processes.
b)
They involve only physical transformations.
c)
New substances are formed with different properties.
d)
Energy is never involved in chemical changes.
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Eduskill Classes answered |
A key characteristic of most chemical changes is the formation of new substances with different properties. During a chemical reaction, the bonds between atoms are broken and rearranged, leading to the creation of distinct chemical compounds with unique characteristics compared to the original reactants.
What aspect of changes does the chapter aim to explore?- a)The permanence of change
- b)The impact of changes on society
- c)The inevitability of changes
- d)The different types of changes and their effects
Correct answer is option 'D'. Can you explain this answer?
a)
The permanence of change
b)
The impact of changes on society
c)
The inevitability of changes
d)
The different types of changes and their effects
|
Praveen Kumar answered |
The chapter delves into the various types of changes and their influence on our lives. By examining both desirable and undesirable changes, the text aims to provide insights into how different forms of change shape our experiences, perspectives, and responses to evolving circumstances.
What does the transformation from night to day symbolize every morning?- a)The continuity of darkness
- b)The permanence of nighttime
- c)The beginning of a new day
- d)The end of all changes
Correct answer is option 'C'. Can you explain this answer?
a)
The continuity of darkness
b)
The permanence of nighttime
c)
The beginning of a new day
d)
The end of all changes
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|
Praveen Kumar answered |
The transition from night to day symbolizes the beginning of a new day, representing a fundamental change that occurs daily in the natural world. This transformation signifies renewal, fresh opportunities, and the cyclic nature of time.
What type of change is exemplified by the aging of our bodies and the growth of a mango seedling into a tree?- a)Fast change
- b)Slow change
- c)Reversible change
- d)Sudden change
Correct answer is option 'B'. Can you explain this answer?
a)
Fast change
b)
Slow change
c)
Reversible change
d)
Sudden change
|
|
Vp Classes answered |
The aging of our bodies and the growth of a mango seedling into a tree are examples of slow changes. These processes occur gradually over an extended period, highlighting the characteristic of slow changes where transformations take place over a considerable amount of time rather than suddenly or rapidly.
Which type of change results in the creation of new substances?- a)Physical changes
- b)Chemical changes
- c)Both physical and chemical changes
- d)Neither physical nor chemical changes
Correct answer is option 'B'. Can you explain this answer?
a)
Physical changes
b)
Chemical changes
c)
Both physical and chemical changes
d)
Neither physical nor chemical changes
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Gunjan Lakhani answered |
Chemical changes are characterized by the formation of new substances with different chemical properties from the original substances. This transformation occurs at the molecular level, leading to the creation of entirely new compounds. Understanding this distinction is essential in differentiating between physical changes, where the identity and composition of the substance remain the same, and chemical changes, where new substances are produced.
What is a key difference between physical and chemical changes?- a)Physical changes are always reversible, while chemical changes are irreversible.
- b)Physical changes involve a change in the chemical composition of a substance, while chemical changes do not.
- c)Physical changes alter the state or appearance of a substance without changing its chemical composition, while chemical changes result in the formation of new substances.
- d)Physical changes are always faster than chemical changes.
Correct answer is option 'C'. Can you explain this answer?
a)
Physical changes are always reversible, while chemical changes are irreversible.
b)
Physical changes involve a change in the chemical composition of a substance, while chemical changes do not.
c)
Physical changes alter the state or appearance of a substance without changing its chemical composition, while chemical changes result in the formation of new substances.
d)
Physical changes are always faster than chemical changes.
|
Rohini Seth answered |
A key difference between physical and chemical changes is that physical changes only alter the state or appearance of a substance without changing its chemical composition, whereas chemical changes result in the formation of new substances with different chemical properties. For example, melting ice (a physical change) changes the state of water from solid to liquid without altering its chemical composition, while burning wood (a chemical change) produces new substances like ash and smoke through a chemical reaction.
Which of the following is a characteristic of irreversible changes?- a)They can always be reversed.
- b)They involve changes in physical state.
- c)They are primarily physical changes.
- d)They cannot be turned back into their original form.
Correct answer is option 'D'. Can you explain this answer?
a)
They can always be reversed.
b)
They involve changes in physical state.
c)
They are primarily physical changes.
d)
They cannot be turned back into their original form.
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Subset Academy answered |
Irreversible changes cannot be turned back into their original form. These changes involve transformations that are permanent and typically involve chemical reactions that alter the substances involved in a way that cannot be easily reversed. An example of an irreversible change is rusting iron, where iron reacts with oxygen to form iron oxide, a process that cannot be undone to restore the original iron.
What distinguishes physical changes from chemical changes?- a)Physical changes are always irreversible.
- b)Physical changes create new substances.
- c)Chemical changes are mostly reversible.
- d)The substance retains its properties in physical changes.
Correct answer is option 'D'. Can you explain this answer?
a)
Physical changes are always irreversible.
b)
Physical changes create new substances.
c)
Chemical changes are mostly reversible.
d)
The substance retains its properties in physical changes.
|
|
Subset Academy answered |
Physical changes are characterized by the fact that the substance retains its properties even though its physical state may alter. For instance, when water freezes into ice, the chemical composition remains H2O, indicating a physical change. This distinction is crucial in understanding the fundamental differences between physical and chemical alterations in matter.
In the context of changes, what do slow changes and reversible changes have in common?- a)Both types of changes occur rapidly.
- b)Both types of changes are irreversible.
- c)Both types of changes take a long time.
- d)Both types of changes are spontaneous.
Correct answer is option 'C'. Can you explain this answer?
a)
Both types of changes occur rapidly.
b)
Both types of changes are irreversible.
c)
Both types of changes take a long time.
d)
Both types of changes are spontaneous.
|
|
Rohini Seth answered |
Slow changes and reversible changes share the common characteristic of taking a long time to occur. While slow changes unfold gradually over extended periods, reversible changes may also involve processes that occur relatively slowly when compared to rapid or fast changes. This shared aspect emphasizes the importance of time and duration in understanding the nature of these two types of transformations.
How do chemical changes differ from physical changes in terms of reversibility?- a)Chemical changes are always reversible.
- b)Physical changes are mostly irreversible.
- c)Chemical changes are mostly irreversible.
- d)Physical changes can never be reversed.
Correct answer is option 'C'. Can you explain this answer?
a)
Chemical changes are always reversible.
b)
Physical changes are mostly irreversible.
c)
Chemical changes are mostly irreversible.
d)
Physical changes can never be reversed.
|
|
Gunjan Lakhani answered |
Unlike physical changes, which are mostly reversible, chemical changes are typically irreversible. In a chemical change, new substances are formed with different properties from the original substances. For example, when wood burns and turns into ash, it undergoes a chemical change that is not easily reversible due to the formation of new chemical compounds.
How can changes be viewed in the context of transformation?- a)Changes lead to stagnation and rigidity.
- b)Changes are always reversible.
- c)Changes are integral to growth and development.
- d)Changes are insignificant in the grand scheme of things.
Correct answer is option 'C'. Can you explain this answer?
a)
Changes lead to stagnation and rigidity.
b)
Changes are always reversible.
c)
Changes are integral to growth and development.
d)
Changes are insignificant in the grand scheme of things.
|
|
Praveen Kumar answered |
Changes play a crucial role in driving growth and development by facilitating transformation and adaptation. Viewing changes as opportunities for learning, progress, and renewal can empower individuals to embrace challenges, cultivate resilience, and evolve positively in various aspects of their lives.
What happens to the properties of a substance during a physical change?- a)The properties of the substance change completely.
- b)The substance loses its properties temporarily.
- c)The substance retains its properties.
- d)The properties of the substance become unpredictable.
Correct answer is option 'C'. Can you explain this answer?
a)
The properties of the substance change completely.
b)
The substance loses its properties temporarily.
c)
The substance retains its properties.
d)
The properties of the substance become unpredictable.
|
|
Dr Manju Sen answered |
During a physical change, the properties of the substance remain constant even though its physical state may alter. This means that characteristics such as color, shape, size, and density stay the same throughout the change. For example, when water evaporates to form steam, the chemical composition remains H2O, and the properties of water, such as its boiling point and density, are retained despite the change in state.
Chapter doubts & questions for Changes Around Us - Eureka Plus Class 6: Book Solutions, Notes & Worksheets 2025 is part of Class 6 exam preparation. The chapters have been prepared according to the Class 6 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 6 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Eureka Plus Class 6: Book Solutions, Notes & Worksheets
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