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WorksheetsRevision- Physical and Chemical Changes
Total questions: 20
Worksheet time: 10mins
In which type of change a new substance is formed?
In physical change
In chemical change
In both (a) and (b)
In neither of these
Which among the following is a physical change?
Cutting a log of wood in small pieces
Burning of wood
Ripening of fruit
Cooking of food
Which of the following is a chemical change?
Bursting of a firecracker
Germination of seed
Coal formation from buried trees
All of these
Which is a method to prevent rust?
Crystallization
Sedimentation
Galvanisation
None of these
How crystal of pure substances are obtained?
By crystallization
By chromatography
By peptization
By all these methods
What is the formula of rust?
Fe2O3
Fe3O4
FeO
None of these
What will happen if carbon dioxide gas is passed through lime water ?
Calcium carbonate is formed
The lime water turns milky
Both of these
None of these
Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?
It is more than 7 metres high
It weighs about 6000 kg
It was built more than 1600 years ago
It has not rusted after such a long period
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a:
physical change that can be reversed
chemical change that can be reversed
physical change that cannot be reversed
chemical change that cannot be reversed
The cooking of rice is a physical change.
True
False
When you cut an apple with knife interactions between the apple and the knife take place.
True
False
Eruption of volcano is a reversible change.
True
False
Formation of clouds is a reversible change.
True
False
The salt obtained by evaporation is pure.
True
False
Both oxygen and water are essential for rusting.
True
False
In chemical changes new substances are produced.
True
False
A Man Painted His Main Gate Made Up Of Iron, To
Prevent it from rusting
Protect it from the Sun
Make it look beautiful
Make it dust free
In Which Of The Following Sentences Is Or Are Incorrect?
A change in which only the physical properties of any substances get changed and no new substances is formed.
A change in which the composition and chemical properties of the substances get changes.
Microbes produces enzymes which break down complex organic compounds into simpler substance.
None of the above.
In Which Of The Following Sentences Are Incorrect?
Photosynthesis is a chemical change.
Digestion of food is a chemical change.
Formation of manure from leaves is a chemical change.
Iron and rust are the same substances.
Paheli Is Writing Some Statement Which Is Given By Her Teacher. Would You Help Him To Choose The Correct Statements?
Stainless steel is an alloy of iron which does not rust easily.
Cooking vessels made of copper and brass are given a coating of tin to avoid corrosion.
Galvanization process where thin coating of zinc on iron sheets to prevent rusting.
All the above.
