Changes Around Us
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Physical and Chemical Changes
SubtopicPhysical and Chemical Changes under Changes Around Us for Grade 6 ICSE.
Preview questions (no answers)
- 1.
Beating of heart is a ________ change.
A.Non-periodic
B.Periodic
C.Chemical
D.Irreversible chemical
- 2.
A change in which no new substance is formed is called a:
A.Chemical change
B.Physical change
C.Irreversible change
D.Biological change
- 3.
Which of these is a man-made, desirable change?
A.Cooking food
B.Rusting of iron
C.Earthquakes
D.Spoiling of milk
- 4.
Weathering of rocks is a very ________ change.
A.Fast
B.Slow
C.Periodic
D.Reversible
- 5.
Study the flowchart below showing two different types of transformations in matter. Which of the following statements correctly identifies and distinguishes Process X and Process Y?
A.Process X is a chemical change because heat is involved, while Process Y is a physical change because the color of the milk remains white.
B.Process X is a physical and reversible change, while Process Y is a chemical and irreversible change.
C.Both Process X and Process Y are physical changes because they occur naturally without man-made intervention.
D.Process X is an irreversible change as steam cannot be turned back to water, while Process Y is a reversible change.
- 6.
The sagging of electric wires between poles during the hot summer months is due to:
A.Chemical reaction with oxygen
B.Expansion due to heat
C.Contraction due to heat
D.The weight of the birds sitting on them
- 7.
Which of the following is NOT a characteristic of a physical change?
A.It is usually temporary.
B.No new substance is formed.
C.It is always irreversible.
D.There is no change in the mass of the substance.
- 8.
If we mix iron filings and sand, we can separate them. If we mix salt and water, we can separate them. If we burn magnesium, we cannot get the magnesium back. What is common between the first two cases?
A.They are both examples of chemical changes.
B.They are both examples of physical changes.
C.They both result in the formation of new compounds.
D.They are both irreversible processes.
- 9.
Which of the following is an example of a fast chemical change?
A.Growth of a human being.
B.Rusting of an iron fence.
C.Explosion of a firecracker.
D.Formation of coal from dead plants.
- 10.
When an incandescent light bulb is switched on, the filament glows and emits light. When switched off, it returns to its normal state. This is a:
A.Chemical change because light is produced.
B.Physical change because no new substance is formed and it is reversible.
C.Chemical change because heat is generated.
D.Physical change because the electricity is consumed.
Download the worksheet for Changes Around Us - Physical and Chemical Changes to practice offline. It includes additional chapter-level practice questions.
Reversible and Irreversible Changes
SubtopicReversible and Irreversible Changes under Changes Around Us for Grade 6 ICSE.
Preview questions (no answers)
- 1.
Which of these is a reversible change?
A.Making a toy from paper by cutting it
B.Making a toy from paper by folding it
C.Making a cake from flour
D.Making curd from milk
- 2.
Digestion of food in our stomach is a/an:
A.Reversible change
B.Irreversible change
C.Physical change
D.Temporary change
- 3.
Which of these pairs represents a reversible change followed by an irreversible change?
A.Melting ice and then freezing water
B.Folding paper and then unfolding it
C.Melting wax and then burning the wick
D.Stretching a string and then coiling it
- 4.
When sugar is heated strongly until it turns black and gives off a smell, the change is:
A.Reversible
B.Physical
C.Irreversible
D.Temporary
- 5.
A change where the original substance can be recovered by simple physical means is called a:
A.Chemical change.
B.Irreversible change.
C.Reversible change.
D.Permanent change.
- 6.
Which of the following is a reversible change?
A.Burning of a matchstick.
B.Preparation of cheese from milk.
C.Melting of wax.
D.Germination of a seed.
- 7.
When a solid substance directly changes into gas without passing through the liquid state, the process is called:
A.Evaporation
B.Condensation
C.Sublimation
D.Fusion
- 8.
Digestion of food is a complex process. Which part of it is primarily a physical change?
A.Action of saliva on starch
B.Action of stomach acid on proteins
C.Mastication (chewing) of food in the mouth
D.Absorption of nutrients in the small intestine
- 9.
When a solid directly changes to gas on heating, the process is called sublimation. If the gas directly changes back to solid on cooling, the change is:
A.Chemical and Reversible
B.Physical and Reversible
C.Chemical and Irreversible
D.Physical and Irreversible
- 10.
Identify the incorrect statement regarding changes around us.
A.Most physical changes are reversible
B.All chemical changes result in the formation of new substances
C.Heating always results in a chemical change
D.An irreversible change can be either physical or chemical
Download the worksheet for Changes Around Us - Reversible and Irreversible Changes to practice offline. It includes additional chapter-level practice questions.
Desirable and Undesirable Changes
SubtopicDesirable and Undesirable Changes under Changes Around Us for Grade 6 ICSE.
Preview questions (no answers)
- 1.
Study the process shown in the flowchart. When a baker transforms raw ingredients like flour and water into fresh bread to be eaten, what type of change has occurred?
A.Undesirable change
B.Desirable change
C.Natural disaster
D.Periodic change
- 2.
The manufacturing of paper from wood pulp is a:
A.Undesirable change
B.Natural change
C.Desirable change
D.Periodic change
- 3.
Spilling ink on a clean white shirt is a/an:
A.Desirable change
B.Undesirable change
C.Periodic change
D.Useful change
- 4.
The blooming of flowers in a garden is generally considered a:
A.Undesirable change
B.Desirable change
C.Chemical change
D.Harmful change
- 5.
The rise in sea levels due to the melting of polar ice caps (global warming) is:
A.A desirable change
B.An undesirable change
C.A periodic change
D.A beneficial change
- 6.
The composting of kitchen vegetable peels to make organic fertilizer is a/an:
A.Desirable change
B.Undesirable change
C.Physical change
D.Harmful change
- 7.
The corrosion of historical marble monuments due to acid rain is:
A.A desirable change
B.An undesirable change
C.A physical change
D.A periodic change
- 8.
Identify the man-made change intended to be desirable which has led to the undesirable change of 'Plastic Pollution' in the food chain.
A.The invention of the steam engine.
B.The mass production of lightweight, durable plastic for packaging.
C.The development of organic farming techniques.
D.The creation of solar panels for clean energy.
- 9.
The 'Growth of a Baby' into an adult is a desirable change. Which property of this change is also significant?
A.It is a reversible change.
B.It is a fast change.
C.It is an irreversible natural change.
D.It is a purely physical change with no chemical basis.
- 10.
How can 'Rain' be both a desirable and an undesirable change within the same geographical area?
A.It is desirable for the farmers but undesirable for someone who has just painted their house's exterior.
B.It is desirable when it is acidic and undesirable when it is pure.
C.It is desirable when it causes floods and undesirable when it causes growth.
D.It is never undesirable because it is a part of the water cycle.
Download the worksheet for Changes Around Us - Desirable and Undesirable Changes to practice offline. It includes additional chapter-level practice questions.